Direct-acting, pressure reducing/relieving valve with drain to port 4

Direct-acting, pressure reducing/relieving valves reduce a high primary pressure at the inlet (port 2) to a constant reduced pressure at port 1, with a full-flow relief function from port 1 to tank (port 3). Draining port 4 makes the valve insensitive to pressure at port 3. These valves incorporate a damped construction for stable operation allowing the use of high reduced pressure.

• Maximum pressure at port 3 should be limited to 3000 psi (210 bar).
• All spring ranges are tested for correct operation with 5000 psi (350 bar) inlet pressure.
• Suitable for accumulator circuits since the absence of pilot control flow results in reduced secondary circuit leakage.
• Direct acting concept provides highly reliable operation in contaminated systems, especially at dead headed conditions.
• Unlike pilot operated versions, direct acting valves exhibit a transitional step between reducing and relieving modes. This step equals 5% of the high end of the adjustment range, independent of the valve setting. Therefore, these valves may not be suitable for counterbalancing applications.
• Direct operated version offers superior dynamic response compared to equivalent pilot operated models.
• Pressure on the drain (port 4) is directly additive to the valve setting at a 1:1 ratio and should not exceed 5000 psi (350 bar).
• Leakage specified in Technical Data is out of port 3 with a supply pressure of 2000 psi (140 bar) and the valve set at mid range. This leakage is directly proportional to pressure differential and inversely proportional to viscosity expressed in centistokes.
• Cartridges configured with EPDM seals are for use in systems with phosphate ester fluids. Exposure to petroleum based fluids, greases and lubricants will damage the seals.
• Full reverse flow from reduced pressure (port 1) to inlet (port 2) may cause the main spool to close. If reverse free flow is required in the circuit, consider adding a separate check valve to the circuit.
• By controlling the pressure at the drain (port 4), the effective setting of the valve can be increased over the nominal valve setting.
• Incorporates the Sun floating style construction to minimize the possibility of internal parts binding due to excessive installation torque and/or cavity/cartridge machining variations.

Model CAD Files

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PSHBLAN.dwg

PSHBLAN.dxf

PSHBLAN.prt

PSHBLAN.stp

Symbol CAD Files

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.dwg

.dxf