Direct-acting, pressure reducing/relieving main stage piloted from port 4

Capacity:

40 gpm (160 L/min.)

Functional Group:

Products : Cartridges : Reducing/Relieving : 4 Port : Direct Acting, Main Stage

Model:

PSHT

Product Description

The direct-acting reducer/reliever main section is meant to act as an interface between a low flow pressure source at port

4 and a circuit with higher flow requirements. The valve will reduce a high primary pressure at the inlet (port 2) to a

reduced pressure at port 1, with a full-flow relief function from port 1 to tank (port 3).

The valve incorporates a damped construction for stable operation allowing the use of high reduced pressure.

Technical Features

The valve is biased to the relieving mode with a 100 psi (7 bar) spring.

Pressure at port 4 is directly added to the

setting of the valve once this

threshold is exceeded. For example, 1000 psi (70 bar) at port 4 will

result in a setting of 900 psi (63 bar) at port 1.

Direct operated version offers superior dynamic response compared to

equivalent pilot operated models.

Maximum pressure at port 3 should be limited to 3000 psi (210 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.

Suitable for accumulator circuits since the absence of pilot control flow

results in reduced secondary circuit leakage.

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.

Direct acting concept provides highly reliable operation in

contaminated systems, especially at dead headed conditions.

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).

All spring ranges are tested for correct operation with 5000 psi (350

bar) inlet pressure.

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.

Technical Data

U.S. Units Metric Units

Cavity T-23A

Capacity 40 gpm 160 L/min.

Factory Pressure Settings Established at blocked control port (dead headed)

Maximum Operating Pressure 5000 psi 350 bar

Maximum Valve Leakage at 110 SUS (24 cSt) 4 in³/min.@1000 psi 65 cc/min.@70 bar

Series (from Cavity) Series 3

Valve Hex Size 1 1/4 in. 31,8 mm

Valve Installation Torque 150 - 160 lbf ft 200 - 215 Nm

Seal Kits - Cartridge Buna: 990-023-007

Seal Kits - Cartridge Viton: 990-023-006

Model Weight 3.29 lb. 1.49 kg.

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