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MODEL

PRBC

Direct-acting, pressure reducing/relieving valve with open transition

CAPACITY: 20 L/min. / CAVITY: T-163A

(L)CONTROL

L Standard Screw Adjustment

C Tamper Resistant - Factory Set

K Handknob

(A)ADJUSTMENT RANGE

A 500 - 3000 psi (35 - 210 bar), 700 psi

(50 bar) Standard Setting

B 50 - 1500 psi (3,5 - 105 bar), 200 psi

(14 bar) Standard Setting

D 25 - 800 psi (1,7 - 55 bar), 200 psi (14

bar) Standard Setting

E 25 - 400 psi (1,7 - 28 bar), 200 psi (14

bar) Standard Setting

S 25 - 200 psi (1,7 - 14 bar), 100 psi (7

bar) Standard Setting

W 750 - 4500 psi (50 - 315 bar), 1000 psi

(70 bar) Standard Setting

(N)SEAL MATERIAL

N Buna-N

V Buna-N

NOTE: DATA MAY VARY BY CONFIGURATION. SEE CONFIGURATION SECTION.

Direct-acting, pressure reducing valves reduce a high primary pressure at the inlet (port 2) to a constant reduced

pressure at port 1. These valves incorporate a damped construction for stable operation allowing the use of high

reduced pressure. This valve is open in the transition from reducing to relieving. It provides good pressure control

and dynamic response.

TECHNICAL DATA

Cavity T-163A

Series 0

Capacity 20 L/min.

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

Maximum Operating Pressure 350 bar

Maximum Valve Leakage at 110 SUS (24 cSt) 330 cc/min.

Adjustment - No. of CW Turns from Min. to Max. Setting 7

Valve Hex Size 19,1 mm

Valve Installation Torque 27 - 33 Nm

Adjustment Screw Internal Hex Size 4 mm

Locknut Hex Size 12,7 mm

Locknut Torque 9 - 10 Nm

Seal kit - Cartridge Buna: 990163007

Seal kit - Cartridge Viton: 990163006

Model Weight 0.14 kg.

snhy.com/

PRBC

Model Code Example: PRBCLANCONFIGURATION OPTIONS

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TECHNICAL FEATURES

Pressure at port 3 is directly additive to the valve setting at a 1:1 ratio and should not exceed 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.

The transition from reducing to relieving is slightly open. The result is very good pressure control with oil consumption of about 0.1 gpm (0,4 L/min.).

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.

All spring ranges are tested for correct operation with 5000 psi (350 bar) inlet pressure.

Direct acting concept provides highly reliable operation in contaminated systems, especially at dead headed conditions.

Direct operated version offers superior dynamic response compared to equivalent pilot operated models.

All three-port pressure reducing and reducing/relieving cartridges are physically interchangeable (i.e. same flow path, same cavity for a given frame size). When

considering mounting configurations, it is sometimes recommended that a full capacity return line (port 3) be used with reducing/relieving cartridges.

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