Created on 06/23/2015
c
2015 Sun Hydraulics Corporation See www.sunhydraulics.com for detailed product information 1 of 2
MODEL
PRDC
Direct-acting, pressure reducing/relieving valve with open transition
SERIES 1 / CAPACITY: 40 L/min. / CAVITY: T-11A
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
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 - Number of Clockwise Turns to Increase Setting 5
Locknut Hex Size 15 mm
Locknut Torque 9 - 10 Nm
Seal kit - Cartridge Buna: 990-011-007
Seal kit - Cartridge Polyurethane: 990-011-002
Seal kit - Cartridge Viton: 990-011-006
(L)CONTROL
L Standard Screw Adjustment
C Tamper Resistant - Factory Set
K Handknob
O Handknob with Panel Mount
(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
E EPDM
V Viton
MATERIAL/COATING
Standard Material/Coating
/AP Stainless Steel, Passivated
snhy.com/PRDC
TECHNICAL FEATURES
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.). The relatively
high pilot control flow is only a factor in a dead-headed condition.
Cartridges with EPDM seals are for use in systems with phosphate ester fluids. Exposure to petroleum based fluids, greases and lubricants will damage the seals.
For Series 1 cartridges configured with an O control (panel mount handknob), a .75 in. (19 mm) diameter hole is required in the panel.
NOTES
Model Code Example: PRDCLANCONFIGURATION OPTIONS
Created on 06/23/2015
c
2015 Sun Hydraulics Corporation See www.sunhydraulics.com for detailed product information 2 of 2
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.
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.
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
