Throttle and throttle check valve

Transcription

1 Throttle and throttle check valve RE 79/0.09 Replaces: /6 Types MG and MK Size 6 to 30 Component series X Maximum operating pressure 35 bar Maximum flow 400 l/min K3564- Table of contents Contents Page Features Ordering code Standard types Symbols Function, section 3 Technical data 4 Characteristic curves 5 Unit dimensions 6 Features Suitable for direct in-line installation Pressure and viscosity-dependent Information on available spare parts:

2 /6 Bosch Rexroth AG Hydraulics MG and MK RE 79/0.09 Ordering code G X * Throttle valve Throttle check valve = MG = MK Size 6 = 6 Size 8 = 8 Size 0 = 0 Size 5 = 5 Size 0 = 0 Size 5 = 5 Size 30 = 30 For threaded connection = G No code = V = Further details in the clear text Seal material NBR seals FKM seals (other seals upon request) Attention! Observe compatibility of seals with hydraulic fluid used! X = Component series 0 to 9 (0 to 9: unchanged installation and connection dimensions) Standard types and components are contained in the EPS (standard price list). Symbols Type MG Type MK

3 RE 79/0.09 MG and MK Hydraulics Bosch Rexroth AG 3/6 Function, section The valve types MG and MK are pressure- and viscosity-dependent throttle and throttle check valves. Type MG (throttle valve) Throttling occurrs in both flow directions. The pressure fluid reaches the throttling point (4) via the lateral bores (3). The throttling point is formed between the housing () and the adjustable sleeve (). By rotating the sleeve (), the cross-section of the throttling point (4) can be changed infinitely. Type MK (throttle check valve) When fluid flows through the valve in throttling direction, spring (6) and the pressure fluid press the poppet (5) onto the seat, thus blocking the connection. The pressure fluid uses the lateral bores (3) to reach the throttling point (4), which is formed between the housing () and the adjustable sleeve (). In the opposite direction, the pressure acts on the front face of the poppet (5), lifts the same from the seat, and allows the fluid to flow The pressure fluid flows through the valve without being throttled. At the same time, a part of the pressure fluid flows through the annular gap, which results in the desired self cleaning effect Throttle valve type MG Throttle check valve type MK

4 4/6 Bosch Rexroth AG Hydraulics MG and MK RE 79/0.09 Technical data (For applications outside these parameters, please consult us!) general Size Weight kg Installation position Ambient temperature range C 30 to +80 (NBR seals) 0 to +80 (FKM seals) Any hydraulic Maximum operating pressure bar 35 Cracking pressure (type MK) bar 0.5 Maximum volume flow L/min See characteristic curves page 5 Pressure fluid Mineral oil (HL, HLP) according to DIN554, other hydraulic fluids upon request Pressure fluid temperature range C 30 to +80 (NBR seals) 0 to +80 (FKM seals) Viscosity range mm /s 0 to 800 Maximum permitted degree of contamination of the pressure Class 0/8/5 ) fluid - cleanliness class according to ISO 4406 (c) ) The cleanliness classes specified for the components must be adhered to in hydraulic systems. Efficient filtration prevents malfunctions and at the same time prolongs the service life of components. For the selection of the filters, see data sheets RE 50070, RE 50076, RE 5008, RE 50086, RE und RE

5 RE 79/0.09 MG and MK Hydraulics Bosch Rexroth AG 5/6 Characteristic curves (measured with HLP46, ϑ oil = 40 C ± 5 C) p-q V characteristic curves with open throttle (types MK and MG) Pressure differential in bar ,5 0, 3 4 Pressure differential in bar ,5 0, Flow in l/min Flow in l/min p-q V characteristic curves with open check valve and closed throttle (type MK) Pressure differential in bar 3 3 Pressure differential in bar Flow in l/min Flow in l/min Pressure differential in bar NG6 NG8 3 NG0 4 NG5 5 NG0 6 NG5 7 NG Flow in l/min

6 6/6 Bosch Rexroth AG Hydraulics MG and MK RE 79/0.09 Unit dimensions (dimensions in mm) L T T SW D 0 5 D ØD SW Size D ØD L SW SW T 6 G/ G3/ G/ G3/ G G / G / Bosch Rexroth AG Hydraulics Zum Eisengießer 9786 Lohr am Main, Germany Phone +49 (0) 93 5 / 8-0 Fax +49 (0) 93 5 / documentation@boschrexroth.de This document, as well as the data, specifications and other information set forth in it, are the exclusive property of Bosch Rexroth AG. It may not be reproduced or given to third parties without its consent. The data specified above only serve to describe the product. No statements concerning a certain condition or suitability for a certain application can be derived from our information. The information given does not release the user from the obligation of own judgment and verification. It must be remembered that our products are subject to a natural process of wear and aging.

7 RE 79/0.09 MG and MK Hydraulics Bosch Rexroth AG 7/6 Notes Bosch Rexroth AG Hydraulics Zum Eisengießer 9786 Lohr am Main, Germany Phone +49 (0) 93 5 / 8-0 Fax +49 (0) 93 5 / documentation@boschrexroth.de This document, as well as the data, specifications and other information set forth in it, are the exclusive property of Bosch Rexroth AG. It may not be reproduced or given to third parties without its consent. The data specified above only serve to describe the product. No statements concerning a certain condition or suitability for a certain application can be derived from our information. The information given does not release the user from the obligation of own judgment and verification. It must be remembered that our products are subject to a natural process of wear and aging.

8 8/6 Bosch Rexroth AG Hydraulics MG and MK RE 79/0.09 Notes Bosch Rexroth AG Hydraulics Zum Eisengießer 9786 Lohr am Main, Germany Phone +49 (0) 93 5 / 8-0 Fax +49 (0) 93 5 / documentation@boschrexroth.de This document, as well as the data, specifications and other information set forth in it, are the exclusive property of Bosch Rexroth AG. It may not be reproduced or given to third parties without its consent. The data specified above only serve to describe the product. No statements concerning a certain condition or suitability for a certain application can be derived from our information. The information given does not release the user from the obligation of own judgment and verification. It must be remembered that our products are subject to a natural process of wear and aging.

9 Throttle and throttle check valve RE 76/. Replaces: /8 Types FG and FK Size 6 to 3 Component series X Maximum operating pressure 35 bar Maximum flow 400 l/min H747 Table of contents Contents Page Features Ordering code Function, symbols, sections 3 Technical data 4 Characteristic curves 5 Unit dimensions 6 to 8 Features For block installation (cartridge valve, screw-in cartridge valve) 3 adjustment types, optionally: Rotary knob Lockable rotary knob with scale Rotary knob with scale Different cracking pressures (type FK) Information on available spare parts:

10 /8 Bosch Rexroth AG Hydraulics FG; FK RE 76/. Ordering code X * Throttle valve Throttle check valve = FG = FK Size 6 = 6 Size 5 = 5 Size 3 = 3 Type of connection Cartridge valve = K Screw-in cartridge valve = C Adjustment type Rotary knob = Lockable rotary knob with scale = 3 Rotary knob with scale = 7 ) Only with type FG ) Only with type FK Further details in the plain text Seal material no code = NBR seals V = FKM seals (other seals upon request) Attention! Observe compatibility of the seals with the hydraulic fluid used! X = Component series 0 to 9 (0 to 9: Unchanged installation and connection dimensions) Cracking pressure (throttle check valve) 0 ) = Without spring ) = Cracking pressure.5 bar (standard) 3 ) = Cracking pressure 3 bar

11 RE 76/. FG; FK Hydraulics Bosch Rexroth AG 3/8 Function, symbols, sections Type FG. K and FK. K (cartridge valve) The valves of the types FG and FK are throttle and throttle check valves. The flow depends on the pressure differential between A and B and on the viscosity of the hydraulic fluid. The valves mainly consist of adjustment type (), housing (), throttling pin (3) and check valve (4) with valve type FK. The flow is throttled from A to B. The throttle cross-section (5) is adjusted by displacing the throttling pin (3) in axial direction. For free flow back from B to A, a check valve (4) is installed with valve type FK. Type FG. C and FK. C (screw-in cartridge valve) In principle, the function of these valves corresponds to the function of version "K". However, they are delivered without housing () and thus can be screwed into the block directly. B B A A A 5 A 4 B B Type FG. K Type FK. C

12 4/8 Bosch Rexroth AG Hydraulics FG; FK RE 76/. Technical data (For applications outside these parameters, please consult us!) general Size Size Weight Cartridge valve "K" kg Installation position Screw-in cartridge valve "C" kg Ambient temperature range C 30 to +80 (NBR seals) 0 to +80 (FKM seals) Any hydraulic Maximum operating pressure bar 35 Maximum flow (standard valves) l/min Hydraulic fluid See table below Hydraulic fluid temperature range C 30 to +80 (NBR seals) 0 to +80 (FKM seals) Viscosity range mm /s 0 to 800 Maximum permitted degree of contamination of the hydraulic Class 0/8/5 ) fluid - cleanliness class according to ISO 4406 (c) Actuating torque (adjustment type) Nm Approx. 5 Hydraulic fluid Classification Suitable Standards sealing materials Mineral oils and related hydrocarbons HL, HLP, HLPD, HVLP, HVLPD NBR, FKM DIN 554 Environmentally compatible Insoluble in water HEES FKM HETG NBR, FKM ISO 5380 Soluble in water HEPG FKM ISO 5380 Flame-resistant Water-free HFDU, HFDR FKM ISO 9 Important information on hydraulic fluids! For more information and data on the use of other hydraulic fluids refer to data sheet 900 or contact us! There may be limitations regarding the technical valve data (temperature, pressure range, service life, maintenance intervals, etc.)! ) The cleanliness classes specified for the components must be adhered to in hydraulic systems. Effective filtration prevents faults and at the same time increases the service life of the components. For the selection of the filters see

13 RE 76/. FG; FK Hydraulics Bosch Rexroth AG 5/8 Characteristic curves (measured with HLP46, ϑ Oil = 40 ± 5 C) Pressure differential in bar p-q V -Characteristic curves size 6 Scale value,5,5 3 3,5 4 4,5 5 5,5 6 6, Pressure differential in bar p-q V -Characteristic curves size 5 Scale value,5 3 3,5 4 4,5 5 5, Flow in l/min Flow in l/min Pressure differential in bar p-q V -Characteristic curves size 3 Scale value,5 3 3,5 4 4,5 5 5,5 6 6,5 7 7,5 8 8,5 9 9, Flow in l/min Pressure differential in bar p-q V -Characteristic curves (type FK) Throttle closed by check valve Flow in l/min Pressure differential in bar Size 6 Size 5 3 Size 3 p-q V -Characteristic curves (type FK) Throttle open by throttle and check valve Flow in l/min

14 6/8 Bosch Rexroth AG Hydraulics FG; FK RE 76/. Unit dimensions: Cartridge valve "K" (dimensions in mm) Ø60 Ø60 48 H3 H5 Ø SW ØD H4 H SW H4 H SW 3 H 9 A B L L H6 H ØD Size ØD ØD H H H3 H4 H5 H6 L L SW Installation bore Ø0,0 A A ØD3H7 ØD4H7 Rz 4 30 Pt 6 0,0 A Contact surface Ø0, A L H7 ØD6 A Rz 4 H H8 H9 H0 +0, D7/H L Rz 6 7 B 6 30 Pt 6 ØD5 ) Rz 63-0, +0,3 General tolerances ISO 768-mK Item explanations see page 8 ) Visual inspection Size ØD3H7 ØD4H7 ØD5 ØD6 D7 H7 H8 H9 H0 +0. H H L M M M

15 RE 76/. FG; FK Hydraulics Bosch Rexroth AG 7/8 Unit dimensions: Screw-in cartridge valve "C" (dimensions in mm) Ø60 48 H3 H5 Ø SW H4 H SW H4 H SW 5 3 Type FG Type FK Size H3 H4 H5 SW Ø60 Mounting cavity type FG Mounting cavity type FK Pt 6 5 Pt 6 5 B H5 Ø0,0 A A ØD8 +0, ØD9H6 D0 ) Ø0,0 A Pt 6 H5 Ø0,0 A A ØD8 +0, ØD9H6 D0 ) Rz 6 H7 ØD6 H3 Rzmax 8 A -0,05,5 H4 +0, H0-0, H7 ØD6 H3 Rzmax 8 A H7 H4 +0, H0-0, A 0, ØD5H6 0,0 B Rz 6 Ø0,0 A B H6 Rz 6-0, +0,3 ) Rz ØD5 General tolerances ISO 768-mK ) Visual inspection ) Pipe thread according to ISO 8/ Item explanations see page 8 45 B Rz 4 Valve type Valve type FG FK FG FK Size ØD5H6 ØD5 ØD6 ØD8 +0. ØD9H6 D0 ) H7 H0 0. H3 H4 +0. H5 H6 H G3/ G / G

16 8/8 Bosch Rexroth AG Hydraulics FG; FK RE 76/. Unit dimensions Adjustment type "" Adjustment type "7" 3 Adjustment type "3" 4 Setting range 5 Space required to remove the key 6 Depth of fit 7 Port A can be positioned around the central axis of port B. (Attention! Observe the position of the mounting bores!) 8 Control edge 9 Valve mounting screws (cartridge valve "K") see to the right 0 Tightening torques (screw-in cartridge valve "C"): Size 6 M A = 70 Nm ±0 %, moisten thread with hydraulic fluid Size 5 M A = 305 Nm ±0 %, moisten thread with hydraulic fluid Size 3 M A = 600 Nm ±0 %, moisten thread with hydraulic fluid Notice! The tightening torques refer to a housing tensile strength of at least 300 N/mm (corresponds to GG30) Valve mounting screws Screw-in valve "K" (separate order) Size 6 4 hexagon socket Head cap screws ISO M8 x flZn-40h-L Friction coefficient µ total = 0.09 to 0.4, Tightening torque M A = 30 Nm ±0 %, Material no. R9004 Size 5 4 hexagon socket Head cap screws ISO M x flZn-40h-L Friction coefficient µ total = 0.09 to 0.4, Tightening torque M A = 0 Nm ±0 %, Material no. R Size 3 4 hexagon socket Head cap screws ISO M6 x flZn-40h-L Friction coefficient µ total = 0.09 to 0.4, Tightening torque M A = 50 Nm ±0 %, Material no. R Notice! The tightening torques refer to the maximum admissible operating pressure. Friction coefficients, tightening torques, and preload forces interact with each other. Thus, we recommend checking the mounting characteristics with genuine parts and boundary conditions. Tightening torques depend on the strength of the installation housing! Bosch Rexroth AG Hydraulics Zum Eisengießer 9786 Lohr am Main, Germany Phone +49 (0) 93 5 / 8-0 Fax +49 (0) 93 5 / documentation@boschrexroth.de This document, as well as the data, specifications and other information set forth in it, are the exclusive property of Bosch Rexroth AG. It may not be reproduced or given to third parties without its consent. The data specified above only serve to describe the product. No statements concerning a certain condition or suitability for a certain application can be derived from our information. The information given does not release the user from the obligation of own judgment and verification. It must be remembered that our products are subject to a natural process of wear and aging.

17 Throttle valve RE 748/08.07 /4 Type ZFG Size 6 Component series 4X Maximum operating pressure 35 bar [4568 psi] Maximum flow 70 l/min [8.5 US gpm] TB098 Table of contents Contents Page Features Ordering code Function, section, symbol Technical data 3 Characteristic curves 3 Unit dimensions 4 Features Sandwich plate valve Porting pattern to ISO , NFPA T3.5. R and ANSI B93-7 D03 (with locating bore) For limiting a flow Adjustment element: Spindle with hexagon socket Information on available spare parts:

18 /4 Bosch Rexroth AG Hydraulics ZFG RE 748/08.07 Ordering code Z FG 6 P 8 4X * Sandwich plate valve = Z function = Throttle valve = FG Size 6 = 6 Throttling in channel P = P Adjustment element Spindle with hexagon socket = 8 M = V = Further details in clear text Seal material NBR seals FKM seals (other seals on request) Attention! Observe compatibility of seals with hydraulic fluid used! 4X = Component series 40 to 49 (40 to 49: unchanged installation and connection dimensions) Function, section, symbol ( = component side, = plate side) Valves of type ZFG are throttle valves of sandwich plate design. They are used to limit the flow in channel P. When throttled, the hydraulic fluid flows through channel P across throttling point (), which is formed by control land () and throttling spool (3), to port P. Throttling spool (3) can be axially adjusted by means of spindle (4) axial and thus allows the flow across throttling point () to be adjusted. The adjustment stroke is limited on both sides by pin (5). The flow depends on the pressure differential and viscosity. Symbol P A B T P Type ZFG 6 P8-4X/. P

19 RE 748/08.07 ZFG Hydraulics Bosch Rexroth AG 3/4 Technical data (for applications outside these parameters, please consult us!) General Weight kg [lbs] ca. 0.9 [.0] Installation position Optional Ambient temperature range C [ F] 30 to +80 [ to +76] (NBR seals) 0 to +80 [ 4 to +76] (FKM seals) Hydraulic Maximum operating pressure bar [psi] 35 [4568] Maximum flow l/min [US gpm] 70 [8.5] Hydraulic fluid Mineral oil (HL, HLP) to DIN 554 ) ; fast bio-degradable hydraulic fluids to VDMA 4568 (see also RE 90); HETG (rape seed oil) ) ; HEPG (polyglycols) ; HEES (synthetic esters) ) ; other hydraulic fluids on request Hydraulic fluid temperature range C [ F] 30 to +80 [ to +76] (NBR seals) 0 to +80 [ 4 to +76] (FKM seals) Viscosity range mm /s [SUS] 0 to 800 [46 to 3700] Permissible max. degree of contamination of the hydraulic fluid - cleanliness class to ISO 4406 (c) Class 0/8/5 3) ) Suitable for NBR and FKM seals ) Suitable only for FKM seals 3) The cleanliness classes specified for components must be adhered to in hydraulic systems. Effective filtration prevents malfunction and, at the same time, prolongs the service life of components. For the selection of filters, see data sheets RE 50070, RE 50076, RE 5008, RE 50086, RE and RE Characteristic curves (measured with HLP46, ϑ oil ( = 90 SUS) = 40 C ± 5 C [04 F ± 9 F]) p-q V characteristincs with constant throttle position Pressure differential in bar [psi] 3 4 [4568] 35 [4000] [3500] [3000] [500] [000] [500] [000] [500] [0] Throttle position in turns [0] [] [4] [6] [8] [0] [] [4] [6] [8.5] Flow in l/min [US gpm]

20 4/4 Bosch Rexroth AG Hydraulics ZFG RE 748/08.07 Unit dimensions (dimensions in mm [inch]) 40[.57] 6 0, [ ] [0.8] 7 76 [.99] 6 0, [ ] 8 [0.3] 7 F F 45 [.77] [0.76],3 [0.05] F4 A T B P G F3 45 0, [ ] 4,8-0, [ ] 9 [.4] 0,0/00 [0.0004/4.0] Rzmax 4 Required surface quality of valve mounting face 3 4 x 5,5 [ 0.] 5 Nameplate Adjustment element 8 Spindle with hexagon socket for adjusting the flow cross-section (hexagon socket 8 A/F Turning counter-clockwise = increased flow Turning clockwise = reduced flow 3 4 valve mounting bores 4 Identical seal rings for ports A, B, P, T (plate side) 5 Porting pattern to ISO , NFPA T3.5. R and ANSI B93-7 D03 (with locating bore) 6 Locating pin ISO 875-3x8-St 7 Locknut 9 A/F, tightening torque M T = 0 +5 Nm [ ft-lbs] Valve mounting screws (separate order) 4 hexagon socket head cap screws ISO M hexagon socket head cap screws 0-4 UNC Note! The length and tightening torque of the valve mounting screws must be calculated taking into account the components mounted above and below the sandwich plate valve. Bosch Rexroth AG Hydraulics Zum Eisengießer 9786 Lohr am Main, Germany Phone +49 (0) 93 5 / 8-0 Fax +49 (0) 93 5 / documentation@boschrexroth.de This document, as well as the data, specifications and other information set forth in it, are the exclusive property of Bosch Rexroth AG. It may not be reproduced or given to third parties without its consent. The data specified above only serve to describe the product. No statements concerning a certain condition or suitability for a certain application can be derived from our information. The information given does not release the user from the obligation of own judgment and verification. It must be remembered that our products are subject to a natural process of wear and aging.

21 Throttle valve RE 7488/05.07 /8 Type Z.FG Size 0 Component series 3X Maximum operating pressure 35 bar Maximum flow 60 l/min tb08 Table of contents Contents Page Features Ordering code Standard types Symbols Function, section 3 Technical data 4 Characteristic curves 4 Unit dimensions 5 to 8 Features Sandwich plate valve Porting pattern to ISO For limiting the flow of actuator ports Adjustment element: Spindle with hexagon socket and scale Information on available spare parts:

22 /8 Bosch Rexroth AG Hydraulics Z.FG RE 7488/05.07 Ordering code Z FG 0 5 3X V * Sandwich plate valve = Z Number of functions Throttling in channel A, B or P = Throttling in channels A and B = Throttle valve = FG Size 0 = 0 Throttling in channels A and B = Throttling in channel A = A Throttling in channel B = B Throttling in channel P = P Adjustment element Spindle with hexagon socket and scale = 5 Further details in clear text Seal material V = FKM seals (other seals on request) Attention! Observe compatibility of seals with hydraulic fluid used! 3X = Component series 30 to 39 (30 to 39: unchanged installation and connection dimensions) Standard types Type Material number Type Material number ZFG 0 A5-3X/V R ZFG 0 5-3X/V R ZFG 0 B5-3X/V R ZFG 0 P5-3X/V R Symbols ( = component side, = plate side) Type ZFG 0 A5-3X/V Type ZFG 0 B5-3X/V TA P A B TB TA P A B TB Type ZFG 0 P5-3X/V Type ZFG 0 5-3X/V TA P A B TB TA P A B TB

23 RE 7488/05.07 Z.FG Hydraulics Bosch Rexroth AG 3/8 Function, section Valves of type Z.FG are throttle valves of sandwich plate design. They are used to limit the flow in one or two actuator ports. Two throttle valves arranged symmetrically to each other limit the flow in both directions. When throttled, the hydraulic fluid flows through channel A or B via throttling point (), which is formed by control land () and throttling piston (3.), to actuator A or B, respectively. Throttling piston (3.) can be axially adjusted by means of spindle (4) and thus allows the flow across throttling point () to be adjusted. The flow depends on the pressure differential and viscosity. With variant P throttling takes place in channel P. Channels A and B allow a free flow. With variants A or B the channel in which no throttling takes place allows a free flow of the fluid A B A B 4 4 Type ZFG 0-5-3X/V

24 4/8 Bosch Rexroth AG Hydraulics Z.FG RE 7488/05.07 Technical data (for applications outside these parameters, please consult us!) General Weight Variants A and B kg approx. 3 Installation position Variant P kg approx..5 Variant kg approx. 3 Optional Ambient temperature range C 0 to +80 Hydraulic Maximum operating pressure bar 35 Maximum flow l/min 60 Hydraulic fluid Hydraulic fluid temperature range C 0 to +80 Viscosity range mm /s 0 to 800 Permissible max. degree of contamination of the hydrauilc fluid - cleanliness class to ISO 4406 (c) Mineral oil (HL, HLP) to DIN 554; other hydraulic fluids on request Class 0/8/5 ) ) The cleanliness classes specified for components must be adhered to in hydraulic systems. Effective filtration prevents malfunction and, at the same time, prolongs the service life of components. For the selection of filters, see data sheets RE 50070, RE 50076, RE 5008, RE 50086, RE and RE Characteristic curves (measured with HLP46, ϑ oil = 40 C ± 5 C) p-q V characteristic curves with constant throttle position Pressure differential in bar ,5 7 7,5 8 8,5 9 9,5 0 0,5,5 Throttle position in turns Flow in l/min

25 5 7 RE 7488/05.07 Z.FG Hydraulics Bosch Rexroth AG 5/8 Unit dimensions: Variant (dimensions in mm) , ,5 80 x 70 5 x 5, ,7 4 4,7 4,7 49,5 7 5,7 F P F 58 4,9 TA A B TB F4 F3 0,0/00,3 4 x 6,5 3 6 Rzmax 4 Required surface quality of the valve mounting face Nameplate Adjustment element 5 Spindle with hexagon socket and scale for adjusting the flow cross-section (hexagon socket 8 A/F) Anti-clockwise turning = larger flow Clockwise turning = smaller flow 3 4 valve mounting bores 4 R-ring plate 5 Identical seal rings for ports A, B, P, TA, TB 6 Porting pattern to ISO Valve fixing screws (separate order) 4 hexagon socket head cap screws ISO M6-0.9-flZn-40h-L Friction coefficient µ total = 0.09 to 0.4, tightening torque M T = Nm ± 0%

26 5 7 6/8 Bosch Rexroth AG Hydraulics Z.FG RE 7488/05.07 Unit dimensions: Variant A (dimensions in mm) , ,7 4,7,5 49, x 70 5 x 5, F P F 58 4,9 TA A B TB 0,0/00 Rzmax 4 F4 F3 Required surface quality of the valve mounting face,3 4 x 6,5 3 6 Nameplate Adjustment element 5 Spindle with hexagon socket and scale for adjusting the flow cross-section (hexagon socket 8 A/F) Anti-clockwise turning = larger flow Clockwise turning = smaller flow 3 4 valve mounting bores 4 R-ring plate 5 Identical seal rings for ports A, B, P, TA, TB 6 Porting pattern to ISO Valve fixing screws (separate order) 4 hexagon socket head cap screws ISO M6-0.9-flZn-40h-L Friction coefficient µ total = 0.09 to 0.4, tightening torque M T = Nm ± 0%

27 RE 7488/05.07 Z.FG Hydraulics Bosch Rexroth AG 7/8 Unit dimensions: Variant B (dimensions in mm) 48, x 70 5 x 5,7 5 49, ,7 5,7 F P F 0,0/ ,9 TA A B TB Rzmax 4 Required surface quality of the valve mounting face F4 F3,3 4 x 6,5 3 6 Nameplate Adjustment element 5 Spindle with hexagon socket and scale for adjusting the flow cross-section (hexagon socket 8 A/F) Anti-clockwise turning = larger flow Clockwise turning = smaller flow 3 4 Valve mounting bores 4 R-ring plate 5 Identical seal rings for ports A, B, P, TA, TB 6 Porting pattern to ISO Valve fixing screws (separate order) 4 hexagon socket head cap screws ISO M6-0.9-flZn-40h-L Friction coefficient µ total = 0.09 to 0.4, tightening torque M T = Nm ± 0%

28 8/8 Bosch Rexroth AG Hydraulics Z.FG RE 7488/05.07 Unit dimensions: Variant P (dimensions in mm),5 48,5 46,5, x 70 5 x 5,7 5,7 4, F P F TA A B TB 0,0/00 Rzmax 4 F4 F3 Required surface quality of the valve mounting face,3 4 x 6,5 3 6 Nameplate Adjustment element 5 Spindle with hexagon socket and scale for adjusting the flow cross-section (hexagon socket 8 A/F) Anti-clockwise turning = larger flow Clockwise turning = smaller flow 3 4 valve mounting bores 4 R-ring plate 5 Identical seal rings for ports A, B, P, TA, TB 6 Porting pattern to ISO Valve fixing screws (separate order) 4 hexagon socket head cap screws ISO M6-0.9-flZn-40h-L Friction coefficient µ total = 0.09 to 0.4, tightening torque M T = Nm ± 0% Bosch Rexroth AG Hydraulics Zum Eisengießer 9786 Lohr am Main, Germany Phone +49 (0) 93 5 / 8-0 Fax +49 (0) 93 5 / documentation@boschrexroth.de This document, as well as the data, specifications and other information set forth in it, are the exclusive property of Bosch Rexroth AG. It may not be reproduced or given to third parties without its consent. The data specified above only serve to describe the product. No statements concerning a certain condition or suitability for a certain application can be derived from our information. The information given does not release the user from the obligation of own judgment and verification. It must be remembered that our products are subject to a natural process of wear and aging.

29 /8 Twin throttle-type check valve, directly operated RE 7506-XC-B/06.09 Replaces: Type ZFS 6...XC Nominal size 6 Unit series 4X Maximum operating pressure 35 bar Maximum flow rate 80 l/min TB004 ATEX units For potentially explosive atmospheres Part II Technical Data Sheet Information on explosion protection: Range of application in accordance with the Explosion Protection Directive and type of protection Range of application as per Directive 94/9/EG IM, IIG, IID Type of protection of valve: c (EN :004-03) What you need to know about these Operating Instructions These Operating Instructions apply to the explosion-proof version of Rexroth valves, and consist of the following three parts: Part I General Information RE 0700-X-B Part II Technical Data Sheet RE 7506-XC-B RE 7506-XC-B0 Part III Product-specific Instructions RE 7506-XC-B3 You can find further information on the correct handling of Rexroth hydraulic products in our publication General Product Information on Hydraulic Products, RE

30 /8 Bosch Rexroth AG Hydraulics ZFS 6...XC RE 7506-XC-B Overview of Contents Contents Page Features Ordering data and scope of delivery 3 Function, sectional diagram 4 Symbols 4 Technical data 5 Information on explosion protection 5 Characteristic curves 6 Unit dimensions 7 Features Modular valve Position of ports to ISO with tension pin and locating bore Adjusting screw with lock nut and protective cap For limiting the main or pilot flow of two consumer ports For inlet or outlet throttling

31 RE 7506-XC-B ZFS 6...XC Hydraulics Bosch Rexroth AG 3/8 Ordering data and scope of delivery ZFS 6 4X XC J Twin throttle-type check valve, directly operated Nominal size 6 = 6 Throttle-type check valve sides A and B = Throttle-type valve side A = A Throttle-type valve side B = B Setting element Adjusting screw with lock nut and protective cap = Unit series 40 to 49 = 4X (40 to 49: installation and connection dimensions unchanged) Inlet throttling on sides A and B (... 4X/S) = S Inlet throttling on side A (...A 4X/S) Inlet throttling on side B (...B 4X/S) Outlet throttling on sides A and B (... 4X/S) = S Outlet throttling on sides A (...A 4X/S) Outlet throttling on sides B (...B 4X/S) No code = NBR-seals V = FKM-seals Note: Take compatibility of seals and pressure fluid into account! J = Sea-water protection XC = Valve in explosion-proof design, see information on explosion protection, page 5, for details Q = With precision adjustment Q = Standard version Included in scope of delivery: Valve operating instructions with Declaration of Conformity in Part IIII

32 4/8 Bosch Rexroth AG Hydraulics ZFS 6...XC RE 7506-XC-B Function, sectional diagram Type ZFS 6 XC valves are twin throttle-type check valves with a modular design. They are used to limit the main or pilot flow of one or two consumer ports. Two throttle-type check valves positioned symmetrically to one another limit flows in one direction and provide a free return of fluid in the opposite direction. With inlet throttling, the pressure fluid flows through the duct A to reach the consumer A via the throttling point (), which is formed by the valve seat () and the throttling piston (3). The throttling piston (3) can be axially adjusted by means of the adjusting screw (4), thereby enabling the throttling point () to be adjusted as well. The pressure fluid returning from the consumer B pushes the valve seat () against the spring (5) in the direction of the throttling piston (3), thereby enabling the fluid to flow unhindered from B to B via the check valve. The same applies to the flow in the opposite direction. Throttling may take effect in the inlet or the outlet, depending on the valve type. Main flow limitation (version..q..) To change the speed of a consumer (main flow limitation), the twin throttle-type check valve is installed between the directional control valve and the subplate. Pilot flow limitation (version..q..) The twin throttle-type check valve can be used to set the switching delay (pilot flow limitation) of pilot-operated directional control valves. In this case, it is installed between the pilot valve and the main valve. Type ZFS 6 4X/S...XC (inlet throttling) A B A B Symbols ( unit side, plate side) ZFS 6.. 4X/S...XC (inlet throttling) ZFS 6.. 4X/S...XC (outlet throttling) P A B T P A B T ZFS 6 A.. 4X/S...XC (outlet throttling) ZFS 6 B.. 4X/S...XC (inlet throttling) P A B T P A B T

33 RE 7506-XC-B ZFS 6...XC Hydraulics Bosch Rexroth AG 5/8 Technical data General Installation position Optional Ambient temperature range C (FKM-seals) (NBR-seals) Storage temperature range C (FKM-seals) (NBR-seals) Weight kg 0,8 Surface protection Galvanized and chromated olive green FeZnDd DIN 5096 Hydraulic Maximum operating pressure, primary bar 35 Maximum flow rate l/min 80 Maximum leakage at 35 bar pressure difference l/min (through closed throttle) Pressure fluid Mineral oil (HL, HLP) to DIN 554 other pressure fluids available on request Ignition temperature > 80 C Pressure fluid temperature range C (FKM-seals) (NBR-seals) Viscosity range mm /s (preferably 30 60) Maximum permissible degree of contamination of pressure fluid Purity class to ISO 4406 (c) Class 0/8/5 ) Information on explosion protection Range of application as per Directive 94/9/EG IM, IIG IID Type of protection of valve c (EN :004-03) c (EN :004-03) Maximum surface temperature ) C 00 Temperature class T4 Degree of protection IP 67 ) The purity classes stated for the components must be complied with in hydraulic systems. Effective filtration prevents problems and also extends the service life of components. For a selection of filters, see Technical Data Sheets RE 50070, RE and RE ) As high surface temperatures may occur, European standards ISO 373- and EN 98 on the prevention of accidental contact must be observed

34 6/8 Bosch Rexroth AG Hydraulics ZFS 6...XC RE 7506-XC-B Characteristic curves (measured with HLP46, ϑ oil = 40 C ± 5 C) Δp-q V curves for ZFS 6.. 4X/.QXCJ Throttle position in revolutions Δp-q V curves for ZFS 6.. 4X/.QXCJ Throttle position in revolutions , Pressure difference in bar ,5 Pressure difference in bar ) ) ) ) Flow rate in l/min Flow rate in l/min ) Clockwise to stop ) Anti-clockwise to stop Δp-q V curves for ZFS 6... via check valve when throttle is closed Pressure difference in bar Flow rate in l/min

35 RE 7506-XC-B ZFS 6...XC Hydraulics Bosch Rexroth AG 7/8 Unit dimensions (in mm) Type ZFS 6 4X/S...XC (inlet throttling) a b 38,6,6,4 Ø A T B P ,0/00 Rt 4 Required surface quality of mating component Nameplate a Protective cap SW0 b Hexagon socket adjusting screw SW5 and lock nut SW0 3 Sealing ring plate with identical sealing rings for ports P, A, B, T 4 Valve mounting bores 5 Position of ports to ISO , with locating bore and tension pin Ø3 mm 6 Bore for lead sealing by customer. Unless the lead seal is destroyed, the valve can no longer be moved. Valve fastening bolts In order to ensure a secure connection, use only the following valve fastening bolts: 4 hexagon socket head cap screws ISO 476-M5x -0.9-flZn-40h-L (coefficient of friction to VDA 35-0) (must be ordered separately, also see RE 7506-XC-B3, section 9., Available accessories)

36 8/8 Bosch Rexroth AG Hydraulics ZFS 6...XC RE 7506-XC-B Notes Bosch Rexroth AG Hydraulics Zum Eisengießer 9786 Lohr am Main, Germany Telefon +49 (0) 93 5 / 8-0 Telefax +49 (0) 93 5 / documentation@boschrexroth.de This document, as well as the data, specifications and other information set forth in it, are the exclusive property of Bosch Rexroth AG. It may not be reproduced or given to third parties without its consent. The data specified above only serve to describe the product. No statements concerning a certain condition or suitability for a certain application can be derived from our information. The information given does not release the user from the obligation of own judgment and verification. It must be remembered that our products are subject to a natural process of wear and aging.

37 Throttle check valve, seawater-resistant RE 758-M/0.08 Replaces: /8 Type ZFS J Size 0 Component series 3X Maximum operating pressure 35 bar [4569 psi] Maximum flow 60 l/min [4.3 US gpm] tb008 Table of contents Content Page Features Ordering code Symbols Function, section 3 Technical data 4 Characteristic curves 5 Unit dimensions 6 Features Sandwich plate valve Porting pattern to ISO and NFPA T3.5. R Outer parts made of metal; housing and plug screws galvanized Adjustment element: Spindle with hexagon socket Adjustment element corrosion-protected by a cap For limiting the main or pilot flow of actuator ports For meter-in or meter-out throttling Information on available spare parts:

38 /8 Bosch Rexroth AG Hydraulics ZFS J RE 758-M/0.08 Ordering code ZFS 0 5 3X J V * Throttle check valve, sandwich plate design Size 0 = 0 Throttle check valve, side A and B = ) Adjustment element Spindle with hexagon socket = 5 Component series 30 to 39 = 3X (30 to 39: unchanged installation and connection dimensions) ) Identical adjustment elements on sides A and B. J = No code = V = Further details in clear text Seal material FKM seals (other seals on request) Attention! Observe compatibility of seals with hydraulic fluid used! Seawater-resistant With two throttle check valves, meter-in or meter-out throttling (valve can be turned) Symbols ( = valve side, = subplate side) Meter-in throttling Meter-out throttling TA P A B TB TA P A B TB

39 RE 758-M/0.08 ZFS J Hydraulics Bosch Rexroth AG 3/8 Function, section Valves of type ZFS 0 J are throttle check valves of sandwich plate design in a seawater-resistant variant. They are used to limit the main or pilot oil flow of one or two actuator ports. Two throttle check valves, which are arranged symmetrically to each other, limit flows in one direction and allow a free return flow in the opposite direction. With meter-in throttling, hydraulic fluid flows through channel A via throttling point (), which is formed by control land () and throttling spool (3.), to actuator A. Throttling spool (3.) can be axially adjusted by means of spindle (4), thus allowing throttling point () to be adjusted. At the same time, hydraulic fluid present in channel A flows through bore (5) to the opposite spool side (6). Together with the spring force, the pressure applied holds throttling spool (3.) in the throttling position. The hydraulic fluid returning from actuator B shifts throttling spool (3.) against spring (7), thus allowing an unrestricted flow like with a check valve. Depending on the installation position, throttling can be effective in the supply or return line. Main flow limitation To change the velocity of an actuator (main flow limitation), the throttle check valve must be installed between the directional valve and the subplate. Pilot oil flow limitation In conjunction with pilot operated directional valves, the throttle check valve can be used for adjusting the actuating time (pilot oil flow limitation). In this case, it is installed between the pilot and the main valve. Attention! For adjusting spindle (4) only the plug screw (8) may be loosened. Cover (9) must not be removed! The maximum torque of 40 Nm of spindle (4) must not be exceeded! A B 3. 7 A B Meter-in throttling

40 4/8 Bosch Rexroth AG Hydraulics ZFS J RE 758-M/0.08 Technical data (for applications outside these parameters, please consult us!) General Weight kg [lbs] ca. 3. [6.8] Installation position Optional Ambient temperature range C [ F] 0 to +80 [ 4 to +76] Hydraulic Maximum operating pressure bar [psi] 35 [4569] Maximum flow l/min [US gpm] 60 [4.] Hydraulic fluid Mineral oil (HL, HLP) to DIN 554; fast bio-degradable hydraulic fluids to VDMA 4568 (see also RE 90); HETG (rape seed oil); HEPG (polyglycols); HEES (synthetic esters); other hydraulic fluids on request Hydraulic fluid temperature range C [ F] 0 to +80 [ 4 to +76] Viscosity range mm /s [SUS] 0 to 800 [60 to 370] Permissible max. degree of contamination of the hydraulic fluid - cleanliness class to ISO 4406 (c) Class 0/8/5 ) 3) The cleanliness classes specified for components must be adhered to in hydraulic systems. Effective filtration prevents malfunction and, at the same time, prolongs the service life of components. For the selection of filters, see data sheets RE 50070, RE 50076, RE 5008, RE 50086, RE and RE

41 RE 758-M/0.08 ZFS J Hydraulics Bosch Rexroth AG 5/8 Characteristic curves (measured with HLP46, ϑ oil ( = 90 SUS) = 40 C ± 5 C [04 F ± 9 F]) p-q V characteristic curves (via check valve) Pressure differential in bar [psi] [6] [00] [80] [60] [40] [0] [0] Throttle closed Throttle open [0] [5] [0] [5] [0] [5] [30] [35] [4.3] Flow in l/min [US gpm] Pressure differential in bar [psi] [6] [76] [450] [75] [45] [7.5] [4.5] [0] p-q V characteristic curves (throttle position constant) ,5 7 7,5 8 8, [0] [5] [0] [5] [0] [5] [30] [35] [4.3] Flow in l/min [US gpm] 9,5 0 0,5,5 Throttle position in turns

42 6/8 Bosch Rexroth AG Hydraulics ZFS J RE 758-M/0.08 Unit dimensions (dimensions in mm [inch]) 03 [7.99] [6.0] 9 [.9] 48,5 7,5 [0.059] 80 x 70 [3.5 x.76] 4 x 6,7 [ 0.64] 5 x 6 [ 0.63] 6 70 [.76] [0.079] [0.47] 49,5 [.95] F TA A 88 [3.47] X P B F TB 40 [.58],7 [0.5] 0,0/00 [0.0004/4.0] 4 x 6,7 [ 0.64] F4 X F3 0 [ 0.394] 8 (A, B) [ 7,5 (TA, TB) [ 0.35] 0.95] Rzmax 4 Required surface quality of valve mounting face Nameplate Adjustment element 5 Spindle for adjusting the flow cross-section (hexagon socket 8A/F; maximum torque 40 Nm) Loosen plug screw (9) Turning counter-clockwise = larger flow Turning clockwise = smaller flow Attention! For adjusting the spindle, only plug screw (9) may be loosened. Cover (3) must not be removed! 3 Cover 4 4 hexagon socket head cap screws 5 4 through-bores for valve mounting 6 Identical seal rings for ports A, B, P, TA, TB 7 R-ring plate 8 The conversion from meter-in into meter-out throttling can be accomplished by turning the valve around the axis X X 9 Plug screw 0 Porting pattern to ISO and NFPA T3.5. R Valve mounting screws (separate order) 4 hexagon socket head cap screws ISO M6-0.9-flZn-40h-L 4 hexagon socket head cap screws UNC on request Note! The length and tightening torque of valve mounting screws must be calculated taking into account the components mounted below and above the sandwich plate valve. Attention! If bores are required for X- and Y-port (e.g. for pilot operated directional valve size 0) variant SO30 must be selected!

43 RE 758-M/0.08 ZFS J Hydraulics Bosch Rexroth AG 7/8 Notes

44 8/8 Bosch Rexroth AG Hydraulics ZFS J RE 758-M/0.08 Notes Bosch Rexroth AG Hydraulics Zum Eisengießer 9786 Lohr am Main, Germany Phone +49 (0) 93 5 / 8-0 Fax +49 (0) 93 5 / documentation@boschrexroth.de This document, as well as the data, specifications and other information set forth in it, are the exclusive property of Bosch Rexroth AG. It may not be reproduced or given to third parties without its consent. The data specified above only serve to describe the product. No statements concerning a certain condition or suitability for a certain application can be derived from our information. The information given does not release the user from the obligation of own judgment and verification. It must be remembered that our products are subject to a natural process of wear and aging.

45 Throttle check valve RE 756/04.08 Replaces:.0 /8 Type ZFS Size 6 Component series 3X Maximum operating pressure 350 bar [5076 psi] Maximum flow 50 l/min [66 US gpm] tb0 Table of contents Content Page Features Ordering code Symbols Function, section 3 Technical data 4 Characteristic curves 5 Unit dimensions 6 Features Sandwich plate valve Porting pattern to ISO and NFPA T3.5. R-D07 For limiting the flow in actuator ports Adjustment element: Spindle with hexagon socket For meter-in or meter-out throttling Information on available spare parts:

46 /8 Bosch Rexroth AG Hydraulics ZFS RE 756/04.08 Ordering code ZFS 6 8 3X * Throttle check valve, sandwich plate design Size 6 = 6 Throttle check valve Side A and B = Throttle check valve Side A = A Throttle check valve Side B = B Adjustment element Spindle with hexagon socket = 8 Component series 30 to 39 = 3X (30 to 39: unchanged installation and connection dimensions) Standard types and components are given in the EPS (standard price list). Further details in clear text Seal material No code = NBR seals V = FKM seals (other seals on request) Attention! Observe compatibility of seals with hydraulic fluid used S = ( A8 3X/S) meter-in throttling on side A ( B8 3X/S) meter-in throttling on side B ( 8 3X/S) meter-in throttling on sides A and B S = ( A8 3X/S) meter-out throttling on side A ( B8 3X/S) meter-out throttling on side B ( 8 3X/S) meter-out throttling on sides A and B Symbols ( = component side, = plate side) Meter-in throttling S Meter-out throttling S Variant L P X A B Y T L P X A B Y T Variant A L P X A B Y T L P X A B Y T Variant B L P X A B Y T L P X A B Y T

47 RE 756/04.08 ZFS Hydraulics Bosch Rexroth AG 3/8 Function, section Valves of type ZFS are throttle check valves of sandwich plate design. They are used to limit the flow in one or two actuator ports. Two throttle check valves, which are arranged symmetrically to each other, limit flows (through adjustable throttle spools) in one direction and allow free return flow in the opposite direction. In the case of meter-in throttling the hydraulic fluid is fed through channel A via throttling point () to actuator A. The throttle spool (.) can be axially adjusted by means of spindle (3), thus allowing throttling point () to be adjusted. At the same time, the hydraulic fluid present in channel A gets via bore (4) to spool side (5). Together with the spring force, the applied pressure holds the throttle spool (.) in the throttling position. The hydraulic fluid returning from actuator B shifts throttle spool (.). The valve then acts as check valve with free flow. Depending on the variant ( S or S ) throttling can be effective in the inflow or outflow. Flow limitation To change the velocity of an actuator, the throttle check valve is to be installed between the directional valve and the subplate Meter-in throttling L T A P B X Y = component side = plate side

48 4/8 Bosch Rexroth AG Hydraulics ZFS RE 756/04.08 Technical data (for applications outside these parameters, please consult us!) General Weight kg [lbs] ca. 4.7 [0.4] Installation orientation Optional Ambient temperature range C [ F] 30 to +80 [ to +76] (NBR seals) 0 to +80 [ 4 to +76] (FKM seals) Hydraulic Maximum operating pressure bar [psi] 350 [5076] Maximum flow l/min [US gpm] 50 [66] Hydraulic fluid Mineral oil (HL, HLP) to DIN 554 ) ; fast bio-degradable hydraulic fluids to VDMA 4568 (see also RE 90); HETG (rape seed oil) ) ; HEPG (polyglycols) ) ; HEES (synthetic esters) ) ; other hydraulic fluids on request Hydraulic fluid temperature range C [ F] 30 to +80 [ to +76] (NBR seals) 0 to +80 [ 4 to +76] (FKM seals) Viscosity range mm /s [SUS].8 to 380 [3 to 760] Permissible max. degree of contamination of the hydraulic fluid - cleanliness class to ISO 4406 (c) Class 0/8/5 3) ) Suitable for NBR and FKM seals ) Suitable only for FKM seals 3) The cleanliness classes specified for components must be adhered to in hydraulic systems. Effective filtration prevents malfunction and, at the same time, prolongs the service life of components. For the selection of filters, see data sheets RE 50070, RE 50076, RE 5008, RE 50086, RE and RE

49 RE 756/04.08 ZFS Hydraulics Bosch Rexroth AG 5/8 Characteristic curves (measured with HLP46, ϑ oil ( = 90 SUS) = 40 C ±5 C [04 F ± 9 F]) Pressure differential in bar [psi] [6] [00] [80] [60] [40] [0] [0] p-q V characteristic curves (through check valve, with closed throttle) [0] [5] [0] [5] [0] [5] [30] [35] [40] [45] [50] [55] [60] [66] Flow in l/min [US gpm] p-q V characteristic curves (throtlte position constant) [366] [900] ,5 7 7,5 8 8,5 Pressure differential in bar [psi] [75] [450] [75] [45] [7.5] Throttle position in turns [0] [0] [5] [0] [5] [0] [5] [30] [35] [40] [45] [50] [55] [60] [66] Flow in l/min [US gpm]

50 6/8 Bosch Rexroth AG Hydraulics ZFS RE 756/04.08 Unit dimensions (dimensions in mm [inch]) max 94 [.57] min 46 [9.68] max 48 [9.76] min 4 [8.8] max 48 [9.76] min 4 [8.8] [3.58] 56,5 [.] L A [0.8] 5 [.0] 3 [Ø0.8] 6 [0.4] 35,5 [.40] x 9,5 [Ø0.374] 4 x 3 [Ø0.5] ,5 F F5 G F 7 7 L T A P B X Y 0,0/00 [0.0004/4.0] Rzmax 4 F4 G F6 F3 Required surface quality of valve mounting face Nameplate Type of adjustment 8 Spindle for adjusting the flow cross-section (hexagon socket 6 A/F) Turning counter-clockwise = larger flow Turning clockwise = smaller flow 3 Through-bores for valve mounting 4 Identical seal rings for ports A, B, P, T 5 Identical seal rings for ports X, Y, L 6 Locating pin (included in the sope of supply) 7 Hexagon 9 A/F, tightening torque M T = 5 Nm [8.4 ft-lbs] 8 Porting pattern to ISO and NFPA T3.5. R-D07 9. Plug screw on variant B 9. Plug screw on variant A Valve mounting screws (separate order) Metric 4 hexagon socket head cap screws ISO M0-0.9-flZn-40h-L hexagon socket head cap screws ISO M6-0.9-flZn-40h-L UNC 4 hexagon socket head cap screws 3/8-6 UNC hexagon socket head cap screws /4-0 UNC Note! The length and tightening torque of valve mounting screws must be calculated taking account of the components mounted above and below the sandwich plate valve.