Fluid Power Symbol
: 25 lpm
: 400 bar
: M22 x 1,5
: See graph
These valves are suitable for applications in explosion-hazard zones, open cast and also in mines. The valve has its application in hydraulic systems, in which the pressure frequently has to be changed. The facility for remote control and signal processing from process control systems enable elegant, comfortable solutions to problems. Installation of the screw-in cartridge in control blocks as well as in sandwich plates (vertical stacked systems) and flange valves of the NG4-Mini and NG6 types.
For explosion-hazard zones ATEX, IECEx and GOST Ex certified Direct operated proportional pressure relief valve as a screw-in cartridge with a thread M22x1,5 for cavity according to ISO 7789. Activated with Wandfl uh-explosion-proof-solenoid. The cartridge body made of steel is zinc coated for corrosion protection. Solenoid coil in acc. with directive 94/9/EC (ATEX) for explosion-hazard zones. The flameproof enclosures (acc. to EN/IEC 60079-1/31 and EN/IEC 61241-1) prevents an explosion in the interior from getting outside. The design prevents a surface temperature capable of igniting. Type test certifi cations: PTB 07 ATEX 1023 IECEx 010.0020 POCC CH.HO06.B00365 IECEx BVS 11.0018 BVS 11 ATEX E 037 The steel housing is zinc-/nickel-coated. The zinc- / nickel coating serves as an excellent corrosion protection.
The valve limits the pressure in port P(1) and reliefs the volume flow to tank port T(2). The back pressure in T(2) influences the pressure in P(1). When the operating pressure set by the proportional solenoid is reached, the poppet spool opens and connects the protected line to the tank T(2). These pressure relief valves are built according to the differential spool principle and are therefore very sensitive adjustable over the whole pressure range and also suitable for systems with extremely low minimum pressures.