This is a direct acting type pressure adjustment valve and depending on the internal or external pilot pressure and drain combinations can be used as sequence, counterbalance, relief, or unload valves.
As sequence or counterbalance valve, reverse flow from secondary side to primary side is enabled with an integrated check valve.
As sequence valve, valve is used to control multiple actuators which operate in succession. When pressure in primary side A exceeds setting pressure, pressurized flow is delivered to secondary side B.
As counterbalance valve, valve generates pressure in the actuator return side to prevent runaway loads caused by gravity, etc. Pressurized oil is not released until primary side A pressure exceeds the setting pressure.
As relief valve, in addition to functioning as a safety valve to prevent excessive pressure in the circuit, it acts to maintain fixed maximum circuit pressure. Pressurized oil is released to tank when pressure in primary side A exceeds the setting pressure.
As unload valve, pressurized oil is released to tank when external pilot pressure exceeds the pressure setting to unload the circuit.
