Hydnet - the specialist in intelligent hydraulic systems
Contact
PRDC

Pressure reducing/relieving valve from Sun Hydraulics

Description

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.

Read more ▼
  • 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 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.
  • 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.

Technical Data

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

Cavity T-11A
Series 1
Capacity 10 gpm
Capacity (metric) 40 L/min.
Maximum Operating Pressure 5000 psi
Maximum Operating Pressure (metric) 350 bar
Factory Pressure Settings Established at 0.25 gpm
Maximum Valve Leakage at 110 SUS (24 cSt) 20 in³/min.
Maximum Valve Leakage at 110 SUS (24 cSt) (metric) 330 cc/min.
Adjustment – No. of CW Turns from Min. to Max. setting 5
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 0.43 lb.
Model Weight (metric) 0.19 kg.
Seal kit – Cartridge Viton: 990011006

Configuration Options

Control

C Tamper Resistant – Factory Set
K Handknob
L Standard Screw Adjustment
O Handknob with Panel Mount

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

Seal Material

N Buna-N
V Viton
E EPDM

Material/Coating

/AP Stainless Steel, Passivated
Cavity: T-11A
Nominal Capacity: 40 lpm (10 gpm)
Downloads
PDFSTP
Possible variants

PRDCCAE, PRDC-CAE, PRDCCAE/AP, PRDC-CAE/AP, PRDCCAN, PRDC-CAN, PRDCCAN/AP, PRDC-CAN/AP, PRDCCAV, PRDC-CAV, PRDCCAV/AP, PRDC-CAV/AP, PRDCCBE, PRDC-CBE, PRDCCBE/AP, PRDC-CBE/AP, PRDCCBN, PRDC-CBN, PRDCCBN/AP, PRDC-CBN/AP, PRDCCBV, PRDC-CBV, PRDCCBV/AP, PRDC-CBV/AP, PRDCCDE, PRDC-CDE, PRDCCDE/AP, PRDC-CDE/AP, PRDCCDN, PRDC-CDN, PRDCCDN/AP, PRDC-CDN/AP, PRDCCDV, PRDC-CDV, PRDCCDV/AP, PRDC-CDV/AP, PRDCCEE, PRDC-CEE, PRDCCEE/AP, PRDC-CEE/AP, PRDCCEN, PRDC-CEN, PRDCCEN/AP, PRDC-CEN/AP, PRDCCEV, PRDC-CEV, PRDCCEV/AP, PRDC-CEV/AP, PRDCCSE, PRDC-CSE, PRDCCSE/AP, PRDC-CSE/AP, PRDCCSN, PRDC-CSN, PRDCCSN/AP, PRDC-CSN/AP, PRDCCSV, PRDC-CSV, PRDCCSV/AP, PRDC-CSV/AP, PRDCCWE, PRDC-CWE, PRDCCWE/AP, PRDC-CWE/AP, PRDCCWN, PRDC-CWN, PRDCCWN/AP, PRDC-CWN/AP, PRDCCWV, PRDC-CWV, PRDCCWV/AP, PRDC-CWV/AP, PRDCKAE, PRDC-KAE, PRDCKAN, PRDC-KAN, PRDCKAV, PRDC-KAV, PRDCKBE, PRDC-KBE, PRDCKBN, PRDC-KBN, PRDCKBV, PRDC-KBV, PRDCKDE, PRDC-KDE, PRDCKDN, PRDC-KDN, PRDCKDV, PRDC-KDV, PRDCKEE, PRDC-KEE, PRDCKEN, PRDC-KEN, PRDCKEV, PRDC-KEV, PRDCKSE, PRDC-KSE, PRDCKSN, PRDC-KSN, PRDCKSV, PRDC-KSV, PRDCKWE, PRDC-KWE, PRDCKWN, PRDC-KWN, PRDCKWV, PRDC-KWV, PRDCLAE/AP, PRDC-LAE/AP, PRDCLAN, PRDC-LAN, PRDCLAN/AP, PRDC-LAN/AP, PRDCLAV, PRDC-LAV, PRDCLAV/AP, PRDC-LAV/AP, PRDCLBE, PRDC-LBE, PRDCLBE/AP, PRDC-LBE/AP, PRDCLBN, PRDC-LBN, PRDCLBN/AP, PRDC-LBN/AP, PRDCLBV, PRDC-LBV, PRDCLBV/AP, PRDC-LBV/AP, PRDCLDE, PRDC-LDE, PRDCLDE/AP, PRDC-LDE/AP, PRDCLDN, PRDC-LDN, PRDCLDN/AP, PRDC-LDN/AP, PRDCLDV, PRDC-LDV, PRDCLDV/AP, PRDC-LDV/AP, PRDCLEE, PRDC-LEE, PRDCLEE/AP, PRDC-LEE/AP, PRDCLEN, PRDC-LEN, PRDCLEN/AP, PRDC-LEN/AP, PRDCLEV, PRDC-LEV, PRDCLEV/AP, PRDC-LEV/AP, PRDCLSE, PRDC-LSE, PRDCLSE/AP, PRDC-LSE/AP, PRDCLSN, PRDC-LSN, PRDCLSN/AP, PRDC-LSN/AP, PRDCLSV, PRDC-LSV, PRDCLSV/AP, PRDC-LSV/AP, PRDCLWE, PRDC-LWE, PRDCLWE/AP, PRDC-LWE/AP, PRDCLWN, PRDC-LWN, PRDCLWN/AP, PRDC-LWN/AP, PRDCLWV, PRDC-LWV, PRDCLWV/AP, PRDC-LWV/AP, PRDCOAE, PRDC-OAE, PRDCOAN, PRDC-OAN, PRDCOAV, PRDC-OAV, PRDCOBE, PRDC-OBE, PRDCOBN, PRDC-OBN, PRDCOBV, PRDC-OBV, PRDCODE, PRDC-ODE, PRDCODN, PRDC-ODN, PRDCODV, PRDC-ODV, PRDCOEE, PRDC-OEE, PRDCOEN, PRDC-OEN, PRDCOEV, PRDC-OEV, PRDCOSE, PRDC-OSE, PRDCOSN, PRDC-OSN, PRDCOSV, PRDC-OSV, PRDCOWE, PRDC-OWE, PRDCOWN, PRDC-OWN, PRDCOWV, PRDC-OWV