Created on 03/17/2016

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

MODEL

PRDM

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

transition - high pressure setting with no command

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

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 reducing mode, connecting port 2 to port 1 at a customer specified pressure setting. Increasing the current to

the coil will proportionally decrease 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 open in the transition from reducing to relieving. It

provides good pressure control and dynamic response.

TECHNICAL DATA

Maximum Operating Pressure 350 bar

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

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

(X)CONTROL

X No Manual Override

(D)ADJUSTMENT RANGE

D 400 - 200 psi (14 - 28 bar)

B 1000 - 400 psi (28 - 70 bar)

E 200 - 100 psi (7 - 14 bar)

S 100 - 10 psi (0,7 - 7 bar)

(N)SEAL MATERIAL

N Buna-N

V Viton

COIL *

No coil

212 DIN 43650-Form A, 12 VDC

224 DIN 43650-Form A, 24 VDC

712 Twin Lead, 12 VDC

724 Twin Lead, 24 VDC

912 Deutsch DT04-2P, 12 VDC

924 Deutsch DT04-2P, 24 VDC

* Additional coil options are available

snhy.com/

PRDM

Model Code Example: PRDMXDNCONFIGURATION OPTIONS

Created on 03/17/2016

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

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).

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.).

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

Coils are interchangeable with Sun's other full flow, solenoid-operated valves and can be mounted on the tube in either direction.

With no electrical signal, the reduced pressure setting will default to the customer specified value. Increasing the command to the coil will proportionally reduce the

secondary pressure value.

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