HYRV12-26 (Pilot Operated Relief Valve)

A cartridge-style pilot-operated spool-type relief valve.


A cartridge-style pilot-operated spool-type relief valve.



The valve prevents flow from ① to ② until pressure at ① exceeds the set crack pressure and opens the pilot section. The pilot flow creates a pressure differential across the spool which causes the valve to open allowing flow from ① to ② protecting the circuit from over pressurization. This cartridge relief offers a smooth transition in response to a load change in a hydraulic circuit.



Operating pressure:

240 Bar


See pressure drop vs. flow graph

Internal leakage:

115ml/min.max. to 80% of nominal setting pressure

Reseat pressure:

90% of crack pressure (crack pressure at 7.6 lpm/ 2 gpm)

Standard spring ranges:

6.9 bar to 27.6 bar

10.3 bar to 103.4 bar

20.7 bar to 241 bar


(-40℃ to +120℃) with NBR material seals


Mineral-based fluids with viscosity of 7.4 to 420 cSt.


HY12-2, see page H.1.5

Body material:

Steel & ductile iron rated to 350 bar


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