Created on 11/27/2015

 2015 Sun Hydraulics Corporation See www.sunhydraulics.com for detailed product information 1 of 2

MODEL

PSHB

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

SERIES 3 / CAPACITY: 160 L/min. / CAVITY: T-23A

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.

TECHNICAL DATA

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

Maximum Operating Pressure 350 bar

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

Adjustment - Number of Clockwise Turns to Increase Setting 5

Locknut Hex Size 15 mm

Locknut Torque 9 - 10 Nm

Seal kit - Cartridge Buna: 990-023-007

Seal kit - Cartridge Polyurethane: 990-023-002

Seal kit - Cartridge Viton: 990-023-006

(L)CONTROL

L Standard Screw Adjustment

C Tamper Resistant - Factory Set

K Handknob

(A)ADJUSTMENT RANGE

A 750 - 3000 psi (50 - 210 bar), 1000 psi

(70 bar) Standard Setting

B 300 - 1500 psi (20 - 105 bar), 500 psi

(35 bar) Standard Setting

D 200 - 800 psi (14 - 55 bar), 400 psi (28

bar) Standard Setting

E 100 - 400 psi (7 - 28 bar), 200 psi (14

bar) Standard Setting

S 50 - 200 psi (3,5 - 14 bar), 100 psi (7

bar) Standard Setting

W 1100 - 4500 psi (76 - 315 bar), 1100 psi

(76 bar) Standard Setting

(N)SEAL MATERIAL

N Buna-N

V Viton

snhy.com/PSHB

TECHNICAL FEATURES

Model Code Example: PSHBLANCONFIGURATION OPTIONS

Created on 11/27/2015

 2015 Sun Hydraulics Corporation See www.sunhydraulics.com for detailed product information 2 of 2

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.

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.

PERFORMANCE CURVES