Created on 02/03/2016
c
2016 Sun Hydraulics Corporation See www.sunhydraulics.com for detailed product information 1 of 2
MODEL
PRBR
Direct-acting, pressure reducing valve
CAPACITY: 20 L/min. / CAVITY: T-163A
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.
TECHNICAL DATA
Factory Pressure Settings Established at 30 cc/min.
Maximum Operating Pressure 350 bar
Maximum Valve Leakage at 110 SUS (24 cSt) 30 cc/min.
Adjustment - Number of Clockwise Turns to Increase Setting 5
Locknut Hex Size 16 mm
Locknut Torque 9 - 10 Nm
Seal kit - Cartridge Buna: 990-163-007
Seal kit - Cartridge Viton: 990-163-006
(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 Viton
snhy.com/PRBR
TECHNICAL FEATURES
Note: This valve has no relieving capability. It should not be used in a dead-headed application. If the reduced pressure side of the circuit has very low leakage the
pressure may rise significantly. The pressure rise will vary from valve to valve.
This type of valve, PR*R, is a good replacement for an LP*C as a normally open, restrictive compensating element if a higher pressure drop across an orifice is
needed.
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.
Suitable for accumulator circuits since the absence of pilot control flow results in reduced secondary circuit leakage.
Model Code Example: PRBRLANCONFIGURATION OPTIONS
Created on 02/03/2016
c
2016 Sun Hydraulics Corporation See www.sunhydraulics.com for detailed product information 2 of 2
Direct operated version offers superior dynamic response compared to equivalent pilot operated models.
Pressure at port 3 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.
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
