1/2 NPT DOUBLE RELIEF VALVE Brand new PRINCE DRV-4HH. Cushion valve or double relief valve. Use to stop or minimize surge, shock and overload in hydraulic circuits. Install between control valve and motor or cylinder. Bypasses to opposite side to prevent cavitation.
What is the difference between relief valve and cushion valve other than plumbing?
A: A relief valve relieves pressure in one pressure line with a dedicated exhaust line. A cushion valve is a double relief used on a double acting actuator (cylinder or motor) where the two lines coming from the directional work ports each have a relief in them. When relief pressure is reached on either line, the exhaust flow is ported internally to the low pressure side opposite the relieving side, whichever that may be at the time.
Date Submitted: 01/29/2017
Is this cross over relief valve available with SAE orb ports?
A: We do not offer that version of this valve, no.
Date Submitted: 01/27/2017
Your schematics recommend a one way check valve down stream toward motor. What check valve do you recommend? I want to power a bush hog from my skid steer.
A: A check valve that is of an appropriate size for the flow of the system is best. A lower cracking pressure will open faster, while a higher cracking pressure will provide some additional braking as long as it's lower than the motor's case pressure limitations.
Date Submitted: 11/18/2016
Do you have a hydraulic schematic for this valve? Thanks, Austin
A: The manufacturer does not provide a hydraulic schematic for this valve. It is designed for two line operation, one high pressure and one low pressure, and to dump excess pressure/flow to the low pressure side on either relief cartridge. There are pilot passages across to each cartridge.
Date Submitted: 06/01/2016
how do i set to 3000 psi relief for a skid steer mower?
A: You have to have a gauge in the system and then load the circuit sufficiently that the pressure will build up. Might be easier with a cylinder that is deadheaded than a motor for the setting and then connecting the motor.
Date Submitted: 09/05/2015
In a simple 2 - single acting cyl. system (snowplow) will this work and how is it "piped" What is the pre-set psi?
A: The two ports on one side go toward your control valve and the other side go to the cylinders. Factory present is about 2000 PSIl.
Date Submitted: 09/13/2014
I need to knw if this unit can allow 1500 psi controling a motor in one rotation direction and 2000 in the opposite?
A: Yes the pressure can be set independently for each side so the relief could be different for the two rotations.