Created on 03/17/2016

 2016 Sun Hydraulics Corporation See www.sunhydraulics.com for detailed product information 1 of 2

MODEL

PRDP

Electro-proportional, direct-acting, pressure reducing/relieving valve

SERIES 1 / CAPACITY: 20 L/min. / CAVITY: T-11A

CONFIGURATION

L Control Standard Screw Adjustment

B Operating Range 100 - 1125 psi (7 - 77,5 bar)

V Seal Material Viton

(none) Coil No coil

This electro-proportional, direct-acting reducer/reliever valve reduces 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). The valve is biased

to the relieving mode. Energizing the coil connects port 2 to port 1. Increasing the current to the coil will

proportionally increase the reduced pressure at port 1. If pressure at port 1 exceeds the setting induced by the coil,

pressure at port 1 is relieved to port 3. This valve is closed in the transition between reducing and relieving resulting

in very low consumption of oil. Optional full manual control is available.

TECHNICAL DATA

Maximum Operating Pressure 350 bar

Maximum Valve Leakage at 110 SUS (24 cSt) 41 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: 990-511-007

Seal kit - Cartridge Viton: 990-511-006

PROPORTIONAL PERFORMANCE DATA

Hysteresis (with dither) 6%

Hysteresis with DC input <8%

Linearity (with dither) <2%

Repeatability (with dither) <2%

Recommended dither frequency 140 Hz

(L)CONTROL

L Standard Screw Adjustment

M Manual Override (Standard)

E Twist (Extended) Manual Override

X No Manual Override

(B)OPERATING RANGE

B 100 - 1125 psi (7 - 77,5 bar)

D 50 - 485 psi (3,5 - 33,5 bar)

E 25 - 250 psi (1,7 - 18 bar)

(V)SEAL MATERIAL

V Viton

N Buna-N

E EPDM

COIL *

No coil

212 DIN 43650 3 pin (Hirschman), 12 VDC

224 DIN 43650 3 pin (Hirschman), 24 VDC

712 Twin Lead, 12 VDC

snhy.com/PRDP

Please verify cartridge clearance requirements when choosing a Sun manifold. Different valve controls and coils require different clearances.

NOTES

Model Code Example: PRDPLBVCONFIGURATION OPTIONS

Created on 03/17/2016

 2016 Sun Hydraulics Corporation See www.sunhydraulics.com for detailed product information 2 of 2

724 Twin Lead, 24 VDC

912 Deutsch DT04-2P, 12 VDC

924 Deutsch DT04-2P, 24 VDC

* Additional coil options are available

TECHNICAL FEATURES

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

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 closed. The result is very low leakage. However, there is a transitional step increase in pressure between reducing and

relieving modes. This step equals about 5% of the high end of the adjustment range, independent of the valve setting.

For optimum performance, an amplifier with current sensing and adjustable dither should be used. Dither should be adjustable between 100 - 250 Hz.

Handknob control for this valve is available in kit form only and can not be ordered from the factory in this configuration. See kits 991-211 and 991-034.

NOTE: There is no upper limit to the pressure setting when using the M control. The more force you exert on the manual override, the higher the resulting pressure.

The 'E' manual control assembly has a mechanical life expectancy of approximately 7,000 cycles.

The momentary/twist override option "E" allows the operator to shift the valve by twisting the manual override clockwise 90 degrees.

Cartridges configured with EPDM seals are for use in systems with phosphate ester fluids. Exposure to petroleum based fluids, greases and lubricants will damage

the seals.

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.

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.

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.

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