0/06 ilot operated pressure relief valve.6 ype ZD/ ZD 6V..L4X Size 6 up to 5bar up to 60 L/min Contents Function and configuration 0 Symbols 0 Specification 0 echnical data 0 Characteristic curves 0 Unit dimensions 04-05 Features - Sandwich plate valve - orting pattern to DIN 4 40 form and ISO 440 - For threaded connection and sub-plate mounting - 4 pressure ranges - 5 circuit options - 4 adjustment elements: Rotary knob djustable bolt with protective cap Lockable rotary knob with scale Rotary knob with scale 77
0/06 Hengli hydraulic Hydraulic components ressure valves ype ZD/ ZD 6V..L4X Function and configuration ressure relief valve types ZD and ZD are pilot operated and sandwich structure. hey are used to limit the pressure in a hydraulic system.hey consist of the housing (7), together with one or two pressure relief valve cartridges (4). he system pressure is set by the inserted relief valve(4). t static position, the valves are closed. ressure in port acts on the spool (). ressure fluid flows through orifice () to the spring loaded side of the spool () and through orifice () to the pilot poppet (6). If the pressure in port rises beyond the value setting at spring (5), the pilot poppet (6) opens. Fluid can flow from the spring loaded side of spool (), orifice (),and channel (8) into port. he pressure drop moves spool () to open the connection from to, while the setting pressure at spring (5) is maintained. ilot oil returns from the two spring chambers via port externally. 0 5 4 6 8 7 Notes: he pilot relief valves have more internal leakage, If lower leakage is demanded, such as safety valve, it is recommended to choose direct operated pressure relief valves, ZDD type. Symbols ype ZD6V... ype ZD6V... ype ZD6V... =valve side = sub-plate side ype ZD6VC... ype ZD6VD... E-Q characteristic curve Emin-Q characteristic curve Setting pressure (bar) 50 00 50 00 50 00 50 0 0 0 0 40 50 60 78 Min. setting pressure (bar) 0 5 0 5 0 5 0 4 0 0 0 40 50 60
ressure valves ype ZD/ ZD 6V..L4X Hydraulic components Hengli hydraulic 0 /06 Specification Sandwich plate = Z Only applies to versions VC and VD: With pressure relief valve cartridges = echnical data Z D 6 ressure relief valve = D Nominal size 6 =6 Relief function from to: =V =V =V and =VC and =VD L4X / * Further details in clear text No code = NR seals V = FKM seals 5 = ressure adjustable up to 50bar 0 = ressure adjustable up to 00bar 0 = ressure adjustable up to 00bar.5 = ressure adjustable up to 5bar L4X = Series L40 to L49 (L40 to L49: unchanged installation and connection dimensions) = Rotary knob = djustable bolt with protective cap = Lockable rotary knob with scale 7= Rotary knob with scale 0 Fluid Mineral oil suitable for NR and FKM seal hosphate ester for FKM seal Fluid temperature range -0 to +80 (NR seal ) -0 to +80 (FKM seal ) Viscosity range mm /s 0 to 800 Degree of contamination Maximum permissible degree of fluid contamination: Class 9. NS 68 or 0/8/5, ISO4406 Max.operating pressure bar to 5 Max.adjustable pressure bar 50;00;00;5 Max. flow-rate L/min 60 Weight ype ZD6 kg pprox.. ype ZD6 kg pprox..9 Characteristic curves ( Measured at t=40 ±5, using HL46) E-Q characteristic curve Emin-Q characteristic curve Setting pressure (bar) 50 00 50 00 50 00 50 0 0 0 0 40 50 60 Flow (L/min) Min. setting pressure (bar) 0 5 0 5 0 5 0 4 0 0 0 40 50 60 Flow (L/min) he curves are measured at zero back pressure.. VD( to ). V. V and VC 4. V and VD( to ) 79
04/06 Hengli hydraulic Hydraulic components ressure valves ype ZD/ ZD 6V..L4X Unit dimensions (Dimensions in mm) ype ZD6V...L4X/... 4 5 6 8 87 96.5 6.5 Φ 0 9 8 0 7.8 9 4 M5;0 valve fixing screw hole 0..5 8 Φ0 Φ0 6 56 5 0 7.8 7 9.5 0..5 44.5 4 Φ7.6max Dimensions of 6.5 9 4 Φ5.4 8.5 5 4 6 98.5 88.5 8 40 40 6.5 ype ZD6V...L4X/... ype ZD6V...L4X/... 0 9 8 Φ 5 44.5 7 4 Φ5.4 7.8 9.5 0 0. 4.5 5.5 6 Φ0 Φ0 8 0.0/00mm 0.8 Requirement of 6.5 56 9 Nameplate djustment element "" djustment element "" 4 djustment element "" 5 djustment element "7" 6 Space required to remove the key 7 Valve fixing holes 8 Nut for locking S=4 9 External hexagon screw S=0 0 O-ring 9.5.78(,,,) External hexagon S=4 ightening torque M =50 Nm Valve fixing screws: M5 internal hexagon screw or L 0.0 double-screw bolt with L 0.0 nut G/ 70.-0.9, the length according to sandwich, tightening torque M =8.9 Nm, must be ordered separately. 80
ressure valves ype ZD/ ZD 6V..L4X Hydraulic components Hengli hydraulic 05 /06 Unit dimensions (Dimensions in mm) ype ZD6VC...L4X/... ype ZD6VD...L4X/... 6 5 5 6 9 8 90 90 8 0 9 8 0 40 4 4 4 8 0 4 9 0 9 8 Φ Φ0 0 7 6 4 4 Φ5.4 5 6 44.5 5 Φ0 9 8 57 0. 6.5.5 9 7.8 7 5 57 7 4 M5;0 Valve fixing holes 4 Φ7.6max Nameplate djustment element "" djustment element "" 4 djustment element "" 5 djustment element "7" 6 Space required to remove the key 7 Valve fixing holes 8 Lockable nut S=4 9 External hexagon screw S=0 0 O-ring 9.5.78( (,,,) 7.8 9 Dimensions of 0. 6.5.5 0.0/00mm 0.8 Requirement of External hexagon S=4, ightening torque M =50 Nm Valve fixing screws: M5 internal hexagon screw or L 0.0 double-screw bolt G/ 70.-0.9, the length according to sandwich, tightening torque M =8.9Nm, must be ordered separately. 8
06/06 Hengli hydraulic Hydraulic components ressure valves ype ZD/ ZD 6V..L4X 0 China +86 400 0 8889 Germany +49 74 86469 merica +0 60 995 674 Japan +8 0 6809 696 his brochure can be reproduced, edited, reproduced or transmitted electronically without the authorization of Hengli Hydraulic Company. Due to the continuous development of the product, the information in this brochure is not specific to the specific conditions or applicability of the industry, thus, Hengli does not take any responsibility for any incomplete or inaccurate description. 8