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PRDP

Pressure reducing/relieving valve from Sun Hydraulics

Description

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.

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  • 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 circu

Technical Data

Note: Data may vary by configuration. See CONFIGURATION section.

Cavity T-11A
Series 1
Capacity 5 gpm
Capacity (metric) 20 L/min.
Maximum Operating Pressure 5000 psi
Maximum Operating Pressure (metric) 350 bar
Maximum Valve Leakage at 110 SUS (24 cSt) 2.5 in³/min.
Maximum Valve Leakage at 110 SUS (24 cSt) (metric) 41 cc/min.
Adjustment – No. of CW Turns from Min. to Max. setting 5
Solenoid Tube Diameter .75 in.
Solenoid Tube Diameter (metric) 19 mm
Valve Hex Size 7/8 in.
Valve Hex Size (metric) 22,2 mm
Valve Installation Torque 30 – 35 lbf ft
Valve Installation Torque (metric) 41 – 47 Nm
Adjustment Screw Internal Hex Size 5/32 in.
Adjustment Screw Internal Hex Size (metric) 4 mm
Locknut Hex Size 9/16 in.
Locknut Hex Size (metric) 15 mm
Locknut Torque 80 – 90 lbf in.
Locknut Torque (metric) 9 – 10 Nm
Model Weight (with coil) 1.20 lb
Model Weight (with coil) (metric) 0,55 kg
Seal kit – Cartridge Viton: 990511006
Seal and nut kit – Coil Viton: 990770006
Model Weight 0.73 lb.
Model Weight (metric) 0.33 kg.
Hysteresis (with dither) 6%
Hysteresis with DC input <8%
Linearity (with dither) <2%
Repeatability (with dither) <2%
Recommended dither frequency 140 Hz

Configuration Options

Control

M ★ Manual Override (Standard)
E Twist (Extended) Manual Override
L Standard Screw Adjustment
X No Manual Override

Operating Range

D ★ 50 – 485 psi (3,5 – 33,5 bar)
E ★ 25 – 250 psi (1,7 – 18 bar)
B 100 – 1125 psi (7 – 77,5 bar)

Seal Material

N ★ Buna-N
V Viton
E EPDM

Control

X01 {with XMD-01 driver}
X02 {with XMD-02 driver}
EMB {with embedded driver}

Coil

212 DIN 43650-Form A, 12 VDC
212N DIN 43650-Form A, 12 VDC, no transient voltage suppression (TVS) diodes
212NX01 DIN 43650-Form A, 12 VDC, no transient voltage suppression (TVS) diodes, with XMD-01 driver
212NX02 DIN 43650-Form A, 12 VDC, no transient voltage suppression (TVS) diodes, with XMD-02 driver
214N DIN 43650-Form A, 14 VDC, no transient voltage suppression (TVS) diodes
214NX01 DIN 43650-Form A, 14 VDC, no transient voltage suppression (TVS) diodes, with XMD-01 driver
214NX02 DIN 43650-Form A, 14 VDC, no transient voltage suppression (TVS) diodes, with XMD-02 driver
214X02 DIN 43650-Form A, 14 VDC, with XMD-02 driver
224 DIN 43650-Form A, 24 VDC
224N DIN 43650-Form A, 24 VDC, no transient voltage suppression (TVS) diodes
224NX01 DIN 43650-Form A, 24 VDC, no transient voltage suppression (TVS) diodes, with XMD-01 driver
224NX02 DIN 43650-Form A, 24 VDC, no transient voltage suppression (TVS) diodes, with XMD-02 driver
2B12A DIN 43650-Form A, command common on fourth pin, 12 VDC, 0-20 mA
2B12B DIN 43650-Form A, command common on fourth pin, 12 VDC, Bluetooth
2B12V DIN 43650-Form A, command common on fourth pin, 12 VDC, 0-10V
2B24A DIN 43650-Form A, command common on fourth pin, 24 VDC, 0-20 mA
2B24B DIN 43650-Form A, command common on fourth pin, 24 VDC, Bluetooth
2B24V DIN 43650-Form A, command common on fourth pin, 24 VDC, 0-10V
2C12V DIN 43650-Form A, +5V reference on fourth pin, 12 VDC, 0-10V
2C24V DIN 43650-Form A, +5V reference on fourth pin, 24 VDC, 0-10V
2D12A DIN 43650-Form A, enable input on fourth pin, 12 VDC, 0-20 mA
2D24A DIN 43650-Form A, enable input on fourth pin, 24 VDC, 0-20 mA
2D24V DIN 43650-Form A, enable input on fourth pin, 24 VDC, 0-10V
2F12V DIN 43650-Form A, programmable ramps, separate rise and fall, 12 VDC
2F24V DIN 43650-Form A, programmable ramps, separate rise and fall, 24 VDC
4A12A Deutsch DT04-6P, all functions enabled (separate command common, 5 v reference, and an enable), 12 VDC, 0-20 mA
4A12B Deutsch DT04-6P, all functions enabled (separate command common, 5 v reference, and an enable), 12 VDC, Bluetooth
4A12V Deutsch DT04-6P, all functions enabled (separate command common, 5 v reference, and an enable), 12 VDC, 0-10V
4A24A Deutsch DT04-6P, all functions enabled (separate command common, 5 v reference, and an enable), 24 VDC, 0-20 mA
4A24B Deutsch DT04-6P, all functions enabled (separate command common, 5 v reference, and an enable), 24 VDC, Bluetooth
4A24V Deutsch DT04-6P, all functions enabled (separate command common, 5 v reference, and an enable), 24 VDC, 0-10V
4F12V Deutsch DT04-6P, programmable ramps, separate rise and fall, 12 VDC
4F24V Deutsch DT04-6P, programmable ramps, separate rise and fall, 24 VDC
812 Metri-Pack, 12 VDC
912 Deutsch DT04-2P, 12 VDC
912N Deutsch DT04-2P, 12 VDC, no transient voltage suppression (TVS) diodes
912NX01 Deutsch DT04-2P, 12 VDC, no transient voltage suppression (TVS) diodes, with XMD-01 driver
912NX02 Deutsch DT04-2P, 12 VDC, no transient voltage suppression (TVS) diodes, with XMD-02 driver
914 Deutsch DT04-2P, 14 VDC
914NX01 Deutsch DT04-2P, 14 VDC, no transient voltage suppression (TVS) diodes, with XMD-01 driver
914NX02 Deutsch DT04-2P, 14 VDC, no transient voltage suppression (TVS) diodes, with XMD-02 driver
924 Deutsch DT04-2P, 24 VDC
924N Deutsch DT04-2P, 24 VDC, no transient voltage suppression (TVS) diodes
924NX01 Deutsch DT04-2P, 24 VDC, no transient voltage suppression (TVS) diodes, with XMD-01 driver
924NX02 Deutsch DT04-2P, 24 VDC, no transient voltage suppression (TVS) diodes, with XMD-02 driver
HN24AA Explosion Proof, 1/2 inch NPT mechanical conduit, 24 VDC, 10 feet twin lead, ATEX Certification Ex mb IIC T3 Gb.
HN24AB Explosion Proof, 1/2 inch NPT mechanical conduit, 24 VDC, 10 feet twin lead, CSA Certification
Cavity: T-11A
Nominal Capacity: 20 lpm (5 gpm)
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Possible variants

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