Proportional Directional Valve System

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1 roportional Directional Valve System in Sectional Design Reference: ENG-2 Issue: /2

2 Contents age 1 General Description pplication examples Technical data erformance graphs Flow control characteristics Control characteristics rimary-pressure cut-off Secondary pressure relief Circuit diagram (example) Dimensions Complete valve example Inlet module End module Manual operator Ordering code Inlet modules End module ctuator module Symbols Inlet modules End module ctuator modules Modules configuration Control spool type referential combinations of flow rate [l/min] Fluid Note Fluid cleanliness ENG-2/ /2

3 1 General 1.1 Description Our sectional proportional valves regulate the flow rate to the actuator by means of an internal closed-loop control system. Load-independent flow control is guaranteed by individual pressure compensators upstream of each proportional directional valve (load-sensing principle). The highly adaptable modular system consists of an inlet module, actuator modules (with up to eight sections) and an end module. The System is specially designed for use in mobile hydraulics. The user can be assured that the right system is always available for every application. Compact sectional design Load feedback Individual supply cut-off for each actuator port ctuator modules with individual pressure compensators and optional pressure relief valve, primary or secundary Load-independent flow control, even with parallel operation of several actuators Can be used with fixed displacement pumps and load sensing pumps 1.2 pplication examples Mobile Crane Ground Drilling Ground Drilling pplication in explosion protection areas (please consult Bucher Hydraulics) 2 Technical data General characteristics Unit Description, value Design roportional valves, sectional design, spool type Types of operators electro-hydraulic proportional hydraulic manual (oil-tight enclosure) electro-hydraulic proportional - manual, combined electro-hydraulic proportional - hydraulic, combined for other types, please consult Bucher ort type threaded ports to DIN 3852 and DIN ISO 6162 SE flange Mounting attitude unrestricted, but ensure good air-bleeding mbient temperature range C Hydraulic characteristics Unit Description, value Hydraulic fluid HL and HL mineral oil to DIN 51524; for other fluids please consult BUCHER HYDRULICS GmbH Hydraulic fluid temperature range C -2 +8, recommended Viscosity range mm 2 / s (cst) 1 5,recommended Maximum fluid cleanliness Cleanliness class to ISO 446 : 1999 Maximum inlet flow rate l/min 4 Maximum actuator flow rate l/min 26 Maximum pump pressure bar 37 Maximum load pressure bar 42 Maximum tank pressure, port T bar 5 Maximum tank pressure for electrohydraulical pilot stage Class 2/18/15 bar 5 (port Y or T) ENG-2/ /2

4 Hydraulic operation Unit Description, value ilot-pressure range bar 6 2 ressure rating of pilot circuit bar max. 5 Size with threaded ports with SE flanged ports ctuator / B G 1 ¾ 6 SI available ump G 1¼ 1 6 SI available Tank T G 1½ 1¼ 3 SI available Load sensing G ¼ G ¼ available ump for pilot stage G ¼ G ¼ available Tank for pilot stage Y G ¼ G ¼ available Test point for pump pressure M G ¼ G ¼ available Test point for tank pressure MT G ¾ G ¾ available UNF Electrical characteristics Unit Description, value Control current at opening point Control current at max. stroke Hysteresis with 1 Hz WM signal (from control current at max. stroke) rotection class to EN Insulation class to VDE V 12 V 24 V 12 V m 35 7 m 7 14 ± 3 % I 65 Supply voltage V DC 24 / 12 Coil resistance at 2 C Coil resistance at 6 C 24 V 12 V 24 V 12 V ower consumption at max. spool stroke (coil resistance at 6 C) H 21.2 ± 5 % 5.3 ± 5 % V 1.4 Maximum current for 1 % 24 V relative duty cycle with: 12 V m ± 5 % 6.1 ± 5 % 4/ ENG-2/8.215

5 3 erformance graphs 3.1 Flow control characteristics p = p pump - p Load [bar] Q [l/min] I = 1% I = 5% 3.2 Control characteristics Electrohydraulic - proportional Q 7 (12V) 14 [l/min] 35 (24V) 7 I [m] I = 25% p [bar] p [bar] 3.3 rimary-pressure cut-off Q = ctuator flow rate at and B pxl = Load pressure Q [l/min] p [bar] 3.4 Secondary pressure relief Secundary pressure - flow rate - characteristic curve p [bar] Q [l/min] IMORNT! The cross-sectional geometry of the spool and the pressure-differential setting are factory-set so that the valve's working range lies within the characteristic diagram ENG-2/ /2

6 4 Circuit diagram (example) Y T b2 a1 b1 a1 b1 2 a2 DUE7 DUE8 DUE7 DUE8 DUE a b a b a b 2 bar 8 bar 31 bar 6 bar 23 bar 23 bar b2 DUE8 3 D6 D7 D6 D7 D6 D7 32 bar D1 1 T1 DUE1 H8 WV WV WV 2 3 G1 G D DB D DB 23 bar 26 bar 26 bar M B B B Ordering example SC SC18-MG SC18-G-D2/D8-26/16-E24--HL-D23/N--Z (Option Z = additional control port, actuator ) SC18-G-D31/D6-C21/21-E24---S/S- SC18-G-D23/D23-C7/3--Y--D26/D SC18-E-- 6/ ENG-2/8.215

7 5 Dimensions 5.1 Complete valve example , ,5 146, b1 b1 b2 D6 D6 D6 D7 D7 D7 M M1x17 a1 a1 a M1x ca ca B T Y -B ca. 25 b ca M1x17 D1 M1x ENG-2/ /2

8 5.2 Inlet module SC18-GG SC18-MG ca T ca. 165 Y 146 M 147 M 1 x17 ca T 16 ca Y M M1x M1x D M1x SC18-MG M1x17 48 M ca T Y ca. 266 ca D M1x17 8/ ENG-2/8.215

9 5.3 End module SC18-E SC18-EG M1x M1x E TE M1x M1x Manual operator Hand lever in position Without hand lever = Z 137 M M B 23 5 ca ca. 26 -B 23 ca Hand lever in position L ca M6 -B 75 5 ca ca ENG-2/ /2

10 6 Ordering code 6.1 Inlet modules SC 18 - M G SC = roportional valve in sectional design 18 = Nominal size G M V Circuit options (see Section 7.1): = without aux. valve = with system pressure relief, EUM 1) optional = 3-way pressure compensator orts: G = threaded ports to DIN 3852 and DIN ISO 6162 F = SE flanges System pressure relief: 37 = note desired setting [bar] = with circuit option G ilot oil supply : = internal 1 = external ilot oil unloading Y: = internal 1 = external = Unaccounted ilot-pressure reducing D2 [bar]: 35 = standard = if not available ilot-pressure limitation D3 [bar]: 45 = standard = if not available ilot-pressure cut-off 2 (valve V1): = without 1 = with pilot-pressure cut-off (not in combination with EUM 1) ) ilot-pressure cut-off 3 (valve V1): = without 1 = with pilot-pressure cut-off (not in combination with EUM 1) ) = Unaccounted ressure-peak reducing (not in combination with EUM 1) ): = without 1 = V2 < 5 l 2 = V2 > 5 l EUM 1) = without EUM 1) 1 = with EUM 1) (can be not combined with pressure-peak reducing and pilot-pressure cut-off) = Series Identifier (e.g. ) = Option (e.g. ) 1) EUM = Electronic Undersupply Management revents stand still of loads in undersupply situations. More informations see data sheet / ENG-2/8.215

11 6.2 End module SC 18 - E G SC = roportional valve in sectional design 18 = Nominal size E Section type: = end plate orts: G = threaded ports to DIN 3852 and DIN ISO 6162 F = SE flanges = without Unaccounted ort : = closed or not existing 1 = -port open ort T: = closed or not existing 1 = T-port open = Unaccounted = Unaccounted = Unaccounted = Series identifier (e.g. ) = Option ENG-2/ /2

12 6.3 ctuator module Ordering code part 1 SC 18 - Y 3 G - D 33 / S - C 2 / 16 - E 24 - Y - H L - - SC = Sectional design 18 = Nominal size Y = ctuator section 3 = ctuator section number (max.8) orts: G = Threaded ports to DIN 3852 and DIN ISO 6162 F = SE flanges Section for SE design: = Threading type / SE flanges > 55 mm 1 = SE flanges DIN ISO 6162 Load sensing (D6): D = rimary pressure relief D6, manual setting S = Closing plug M = Measuring point = ressure cut-off port, primary [bar] = when pressure adjustment not fitted Load sensing B (D7): D = rimary pressure relief D6, manual setting S = Closing plug M = Measuring point = ressure cut-off port B, primary [bar] = when pressure adjustment not fitted C = Spool type (see section 7.2.3) 21 = Flow rate ort [l/min] e.g = Flow rate ort B [l/min] e.g / ENG-2/8.215

13 6.3.2 Ordering code part 2 SC 18 - Y 3 G - D 33 / S - C 2 / 16 - E 24 - Y - H L - D 15 / K Operation: E = electro-hydraulic proportional = without Supply voltage: = without 12 = 12 V DC 24 = 24 V DC lug connector (solenoid): = M Junior ower Timer D = Deutsch DT4-2 = without (solenoid) 1 = Manual emergency operation (only with operation E) = without = Unaccounted Y = Hydraulic operation = without H = Manual operation = without Lever position with manual operation (see section 5.4) = hand-lever position L = hand-lever position L Z = without hand-lever = without manual operation ressure relief / make up, -side (secondary): D = pressure relief N = make-up K = pressure relief and make up S = closing plug = without 2 = ressure setting [bar], B-side (N,S and = ) ressure relief / make up, B-side (secondary): D = pressure relief N = make-up K = pressure relief and make up S = closing plug = without 16 = ressure setting [bar], B-side (N,S and = ) = Series identifier (e.g. ) = Option ENG-2/ /2

14 7 Symbols 7.1 Inlet modules SC18-G* SC18-M*-11-*--- D1 37bar Y T M Y T DUE M SC18-M*-11-* SC18-V*-11-*--- D1 37bar D1 37bar DUE1 Y T V Y T DUE M M 14/ ENG-2/8.215

15 7.1.5 SC18-M* D1 G7 D3 DUE1 45bar D2 35bar V1 Y T G1 G2 DUE G4 G6 G3 G M 7.2 End module SC18-E SC18-E* E TE ENG-2/ /2

16 7.3 ctuator modules Operating selection roportional electrohydraulically = E 2 3 Hydraulically = Y 2 3 Manually = H 2 3 roportional electrohydraulically and manually = E + H / ENG-2/8.215

17 7.4 Modules configuration ressure cut-off primary Standard: Optional: D = ressure relief valve S = lug D6 D7 W V 2 3 D DB C 26/26 B Secundary valve Standard: Without Optional: D = ressure relief valve K = ressure relief and make-up valve N = Make-up valve S = lug ENG-2/ /2

18 7.5 Control spool type B B B B C B D 7.6 referential combinations of flow rate [l/min] Q /Q B Q /Q B Q /Q B Q /Q B Q /Q B Q /Q B 26/26 21/21 16/16 11/11 7/7 3/3 26/21 21/11 16/11 11/7 7/3 26/16 16/7 26/11 For other combinations consult Bucher Hydraulics 18/ ENG-2/8.215

19 8 Fluid The oil for the proportional valves must have a minimum cleanliness level of 2/18/15 to ISO 446 or class 9 to NS We recommend the use of fluids that contain anti-wear additives for operation with boundary lubrication. Fluids without appropriate additives reduce the service life of valves. The user is responsible for maintaining, and regularly checking, the fluid quality. Bucher Hydraulics recommends a Brugger EN/DIN load capacity > 3 N/mm 2. 9 Note This catalogue is intended for users with specialist knowledge. The user must check the suitability of the equipment described herein in order to ensure that all of the conditions necessary for the safety and proper functioning of the system are fulfilled. If you have any doubts or questions concerning the use of these valves, please consult Bucher Hydraulics. 1 Fluid cleanliness Cleanliness class (RK) onto ISO 446 and NS 1638 Code ISO 446 Dirt particle number / 1 ml 4 m 6 m 14 m NS /21/ /2/ /2/ /2/ /19/ /18/ /17/ /16/ /15/ /14/ /14/ /13/ ENG-2/ /2

20 by Bucher Hydraulics Remscheid GmbH, D Remscheid ll rights reserved. Data is provided for the purpose of product description only, and must not be construed as warranted characteristics in the legal sense. The information does not relieve users from the duty of conducting their own evaluations and tests. Because the products are subject to continual improvement, we reserve the right to amend the product specifications contained in this catalogue. Classification: / ENG-2/8.215

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