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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). Draining port 4 makes the valve insensitive to pressure at port 3. These valves incorporate a damped construction for stable operation allowing the use of high reduced pressure.

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  • Maximum pressure at port 3 should be limited to 3000 psi (210 bar).
  • 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.
  • Pressure on the drain (port 4) 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.
  • 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.
  • By controlling the pressure at the drain (port 4), the effective setting of the valve can be increased over the nominal valve setting.
  • 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-22A
Series 2
Capacity 20 gpm
Capacity (metric) 80 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) 3 in³/min.@1000 psi
Maximum Valve Leakage at 110 SUS (24 cSt) (metric) 50 cc/min.@70 bar
Adjustment – No. of CW Turns from Min. to Max. setting 5
Valve Hex Size 1 1/8 in.
Valve Hex Size (metric) 28,6 mm
Valve Installation Torque 45 – 50 lbf ft
Valve Installation Torque (metric) 61 – 68 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 0.74 lb.
Model Weight (metric) 0.33 kg.
Seal kit – Cartridge Viton: 990022006

Configuration Options

Control

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

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

Seal Material

N Buna-N
V Viton
Cavity: T-22A
Nominal Capacity: 80 lpm (20 gpm)
Downloads
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Possible variants

PSFBCAN, PSFB-CAN, PSFBCAV, PSFB-CAV, PSFBCBN, PSFB-CBN, PSFBCBV, PSFB-CBV, PSFBCDN, PSFB-CDN, PSFBCDV, PSFB-CDV, PSFBCEN, PSFB-CEN, PSFBCEV, PSFB-CEV, PSFBCSN, PSFB-CSN, PSFBCSV, PSFB-CSV, PSFBKAN, PSFB-KAN, PSFBKAV, PSFB-KAV, PSFBKBN, PSFB-KBN, PSFBKBV, PSFB-KBV, PSFBKDN, PSFB-KDN, PSFBKDV, PSFB-KDV, PSFBKEN, PSFB-KEN, PSFBKEV, PSFB-KEV, PSFBKSN, PSFB-KSN, PSFBKSV, PSFB-KSV, PSFBLAN, PSFB-LAN, PSFBLAV, PSFB-LAV, PSFBLBN, PSFB-LBN, PSFBLBV, PSFB-LBV, PSFBLDN, PSFB-LDN, PSFBLDV, PSFB-LDV, PSFBLEN, PSFB-LEN, PSFBLEV, PSFB-LEV, PSFBLSN, PSFB-LSN, PSFBLSV, PSFB-LSV

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