Hydnet - the specialist in intelligent hydraulic systems
Contact
PRHB

Pressure reducing/relieving valve from Sun Hydraulics

Description

Direct-acting, pressure reducing/relieving valves reduce 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). These valves incorporate a damped construction for stable operation allowing the use of high reduced pressure.

Read more ▼
  • 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.
  • 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.
  • 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.
  • All spring ranges are tested for correct operation with 5000 psi (350 bar) inlet pressure.
  • 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.
  • Unlike pilot operated versions, direct acting valves exhibit a transitional step between reducing and relieving modes. This step equals 5% of the high end of the adjustment range, independent of the valve setting. Therefore, these valves may not be suitable for counterbalancing applications.
  • Direct operated version offers superior dynamic response compared to equivalent pilot operated models.
  • 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-17A
Series 3
Capacity 40 gpm
Capacity (metric) 160 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) 4 in³/min.
Maximum Valve Leakage at 110 SUS (24 cSt) (metric) 65 cc/min.
Adjustment – No. of CW Turns from Min. to Max. setting 5
Valve Hex Size 1 1/4 in.
Valve Hex Size (metric) 31,8 mm
Valve Installation Torque 150 – 160 lbf ft
Valve Installation Torque (metric) 203 – 217 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 1.54 lb.
Model Weight (metric) 0.70 kg.
Seal kit – Cartridge Viton: 990017006

Configuration Options

Control

L ★ Standard Screw Adjustment
C Tamper Resistant – Factory Set
K Handknob

Adjustment Range

A ★ 750 – 3000 psi (50 – 210 bar), 1000 psi (70 bar) Standard Setting
B 300 – 1500 psi (20 – 105 bar), 500 psi (35 bar) Standard Setting
D 200 – 800 psi (14 – 55 bar), 400 psi (28 bar) Standard Setting
E 100 – 400 psi (7 – 28 bar), 200 psi (14 bar) Standard Setting
S 50 – 200 psi (3,5 – 14 bar), 100 psi (7 bar) Standard Setting
W 1100 – 4500 psi (76 – 315 bar), 1100 psi (76 bar) Standard Setting

Seal Material

N ★ Buna-N
V Viton
E EPDM

Material/Coating

/AP Stainless Steel, Passivated
/LH Mild Steel, Zinc-Nickel
Cavity: T-17A
Nominal Capacity: 40 gpm (160 lpm)
Downloads
PDFSTP
Possible variants

PRHBCAE, PRHB-CAE, PRHBCAN, PRHB-CAN, PRHBCAN/AP, PRHB-CAN/AP, PRHBCAN/LH, PRHB-CAN/LH, PRHBCAV, PRHB-CAV, PRHBCAV/AP, PRHB-CAV/AP, PRHBCAV/LH, PRHB-CAV/LH, PRHBCBE, PRHB-CBE, PRHBCBN, PRHB-CBN, PRHBCBN/AP, PRHB-CBN/AP, PRHBCBN/LH, PRHB-CBN/LH, PRHBCBV, PRHB-CBV, PRHBCBV/AP, PRHB-CBV/AP, PRHBCBV/LH, PRHB-CBV/LH, PRHBCDE, PRHB-CDE, PRHBCDN, PRHB-CDN, PRHBCDN/AP, PRHB-CDN/AP, PRHBCDN/LH, PRHB-CDN/LH, PRHBCDV, PRHB-CDV, PRHBCDV/AP, PRHB-CDV/AP, PRHBCDV/LH, PRHB-CDV/LH, PRHBCEE, PRHB-CEE, PRHBCEN, PRHB-CEN, PRHBCEN/AP, PRHB-CEN/AP, PRHBCEN/LH, PRHB-CEN/LH, PRHBCEV, PRHB-CEV, PRHBCEV/AP, PRHB-CEV/AP, PRHBCEV/LH, PRHB-CEV/LH, PRHBCSE, PRHB-CSE, PRHBCSN, PRHB-CSN, PRHBCSN/AP, PRHB-CSN/AP, PRHBCSN/LH, PRHB-CSN/LH, PRHBCSV, PRHB-CSV, PRHBCSV/AP, PRHB-CSV/AP, PRHBCSV/LH, PRHB-CSV/LH, PRHBCWE, PRHB-CWE, PRHBCWN, PRHB-CWN, PRHBCWN/AP, PRHB-CWN/AP, PRHBCWN/LH, PRHB-CWN/LH, PRHBCWV, PRHB-CWV, PRHBCWV/AP, PRHB-CWV/AP, PRHBCWV/LH, PRHB-CWV/LH, PRHBKAE, PRHB-KAE, PRHBKAN, PRHB-KAN, PRHBKAV, PRHB-KAV, PRHBKBE, PRHB-KBE, PRHBKBN, PRHB-KBN, PRHBKBV, PRHB-KBV, PRHBKDE, PRHB-KDE, PRHBKDN, PRHB-KDN, PRHBKDV, PRHB-KDV, PRHBKEE, PRHB-KEE, PRHBKEN, PRHB-KEN, PRHBKEV, PRHB-KEV, PRHBKSE, PRHB-KSE, PRHBKSN, PRHB-KSN, PRHBKSV, PRHB-KSV, PRHBKWE, PRHB-KWE, PRHBKWN, PRHB-KWN, PRHBKWV, PRHB-KWV, PRHBLAE, PRHB-LAE, PRHBLAN, PRHB-LAN, PRHBLAN/AP, PRHB-LAN/AP, PRHBLAN/LH, PRHB-LAN/LH, PRHBLAV, PRHB-LAV, PRHBLAV/AP, PRHB-LAV/AP, PRHBLAV/LH, PRHB-LAV/LH, PRHBLBE, PRHB-LBE, PRHBLBN, PRHB-LBN, PRHBLBN/AP, PRHB-LBN/AP, PRHBLBN/LH, PRHB-LBN/LH, PRHBLBV, PRHB-LBV, PRHBLBV/AP, PRHB-LBV/AP, PRHBLBV/LH, PRHB-LBV/LH, PRHBLDE, PRHB-LDE, PRHBLDN, PRHB-LDN, PRHBLDN/AP, PRHB-LDN/AP, PRHBLDN/LH, PRHB-LDN/LH, PRHBLDV, PRHB-LDV, PRHBLDV/AP, PRHB-LDV/AP, PRHBLDV/LH, PRHB-LDV/LH, PRHBLEE, PRHB-LEE, PRHBLEN, PRHB-LEN, PRHBLEN/AP, PRHB-LEN/AP, PRHBLEN/LH, PRHB-LEN/LH, PRHBLEV, PRHB-LEV, PRHBLEV/LH, PRHB-LEV/LH, PRHBLSE, PRHB-LSE, PRHBLSN, PRHB-LSN, PRHBLSN/AP, PRHB-LSN/AP, PRHBLSN/LH, PRHB-LSN/LH, PRHBLSV, PRHB-LSV, PRHBLSV/LH, PRHB-LSV/LH, PRHBLWE, PRHB-LWE, PRHBLWN, PRHB-LWN, PRHBLWN/AP, PRHB-LWN/AP, PRHBLWN/LH, PRHB-LWN/LH, PRHBLWV, PRHB-LWV, PRHBLWV/AP, PRHB-LWV/AP, PRHBLWV/LH, PRHB-LWV/LH