Safety for Hydraulics Leak free check valve, pilot operated, series ERV Cartridge type, two stage
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1 Safety for Hydraulics Leak free check valve, pilot operated, series Cartridge type, two stage prevents a load from falling if a burst occurs in feed pipe hardened seat and poppet prevents creep of hydraulically clamped actuators working circuits can be shut off and their pressure maintained 3 pplication for stabiliser cylinders on mobile vehicles and similar applications up to 6 bar when used on the rod side, a cylinder ratio of max. 2:1 is permissible 1 General description spring closed, pilot operated, cartridge type poppet valve it holds the load in neutral position without leakage 2 dvantages pilot operated check valve and pipe rupture valve function intergrated in one unit soft opening thanks to optimized decompression (pre opening) function suitable bodies with threaded ports or a combination of threaded/manifold ports are available please consult ucher Hydraulics minimal space requirement thanks to compact design 4 Symbol 5 Main characteristics (for applications outside these parameters, contact ucher Hydraulics) 5.1 General Type spring closed poppet valve with hydraulic piloting Mounting method Ports Mounting position Flow direction Weight Opening ratio Decompression Main opening screw in cartridge, = ø1 mm = ø4 mm any free flow blocked flow is enabled by pressure at port.32 kg load pressure : pilot pressure 1 : : 1 Replaces: / /6 Classification: Reference: 3 P 9514 E /11.5
2 5.2 Hydraulic characteristics Size 8 Rated flow rate Working pressure max. 6 l/min 45 bar (standard), 6 bar Hydraulic fluid Mineral oil to DIN and DIN (HL/HLP). Other fluids consult ucher Hydraulics Operating temperature range Temperature rating seal materials Nitrile (standard) Nitrile (low temperature) Viton 2 C...+8 C, for other temperatures, consult ucher Hydraulics 2 C...+8 C 5 C...+8 C 2 C...+2 C Viscosity range min. viscosity max. viscosity 1 38 mm 2 /s (cst) recommended 2.8 mm 2 /s (cst) 15 mm 2 /s (cst) Filtration/cleanliness class NS 1638 class 9, β 1 75 ISO 446 class 18/15 6 Safety information this valve must only be used for the purpose for which it has been designed before removing or disassembling the valve, all hydraulic pressure must be vented from the system double check! the valve must not be opened without the express permission of the manufacturer 7 Installation information observe all port designations (see section 1) protect seals against becoming damaged observe the tightening torques (see section 1) bleed the hydraulic system before putting it into operation 3 P 9514 E /11.5 2/6
3 8 Functional description, sectional view 8.1 The existing opening ratios (load pressure to control pressure ) decompression = 1 : 2.5 (small cross section ) main opening = 2.1 : 1 (max. cross section ) mean that loaded stabiliser cylinders are retracted at 2 different speeds. 8.2 Under load E.g. with a load pressure of 3 bar, the decompression poppet opens when the control pressure = 3 : 2.5 = 12 bar, and the cylinder retracts "slowly" (the control pressure theoretically required for main opening = 3 x 2.1 = 63 bar). 8.3 fter raising the stabiliser cylinder from the ground, the load pressure is reduced to, e.g. 3 bar, and the main opening (max. cross section) opens at a control pressure of 3 x 2.1 = 63 bar. The cylinder retracts "quickly". spring for main spool and check valve spring centering main spool decompression spring pilot spool pin 9 Characteristic curves (measured at 33 mm /s (cst)) 1 25 Decompression 8 2 p [bar] 6 4 p [bar] 15 1 Main opening Flow rate Q [l/min] Flow rate Q [l/min] 3 P 9514 E /11.5 3/6
4 1 Dimensions, mounting cavity 1.1 8C (standard 45 bar) Cartridge ø34.5 test no. / 8 C M3 x /F / M = 1 Nm Mounting cavity min. 77 ø.5 min. 75 (ø18h8) Ra min. 48 (ø24h8) ø ø1 ø1 ø4 ø.4 ø M3 x ø24 H8 ( ) Ra 1.6 ø ø18h8 ( +.27 ) ø () ø Detail min. 88 Note: ores, and can be positioned anywhere around the circumference. 3 P 9514 E /11.5 4/6
5 1.2 8 C 6 (6 bar) Cartridge ø38.5 test no. / 8 C 6 M34 x /F / M = 3 Nm Mounting cavity min. 79 ø.5 min. 77 (ø18h7) Ra min. 5 (ø26h7) ø ø1 ø1 ø4 ø ø36 M34 x 1.5 ø26 H7 ( +.21 ) Ra 1.6 ø ø18h7 ( +.18 ) ø () ø Detail min. 88 Note: ores, and can be positioned anywhere around the circumference. 3 P 9514 E /11.5 5/6
6 11 Model code key 8 C Valve series Pilot operated check valve = Nominal size 8 = 8 Series C = C Working pressure 45 bar (standard) 6 bar (blank) = 6 Seal material Nitrile (standard) Nitrile (low temperature) Viton = N = T = V UCHER HDRULICS Germany Phone Fax info.de@bucherhydraulics.com France Phone Fax info.fr@bucherhydraulics.com Netherlands Phone Fax info.nl@bucherhydraulics.com UK Phone Fax info.uk@bucherhydraulics.com US Phone Fax info.wi@bucherhydraulics.com Switzerland Italy ustria China Product Center (Elevator) Phone Fax info.ch@bucherhydraulics.com Phone Fax info.it@bucherhydraulics.com Phone Fax info.at@bucherhydraulics.com Phone Fax info.bj@bucherhydraulics.com Phone Fax info.nh@bucherhydraulics.com We reserve the right of modification without notice. 3 P 9514 E /11.5 6/6
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