Loading...
Loading...

Model

PSFTXFN

Control
Seal Material

Direct-acting, pressure reducing/relieving main stage piloted from port 4

Cavity: T-22A | Capacity:

Loading...

Model

PSFTXFN

Control
Seal Material

Technical specifications

The direct-acting reducer/reliever main section is meant to act as an interface between a low flow pressure source at port 4 and a circuit with higher flow requirements. The valve will reduce a high primary pressure at the inlet (port 2) to a reduced pressure at port 1, with a full-flow relief function from port 1 to tank (port 3). The valve incorporates a damped construction for stable operation allowing the use of high reduced pressure.

  • The valve is biased to the relieving mode with a 100 psi (7 bar) spring. Pressure at port 4 is directly added to the setting of the valve once this threshold is exceeded. For example, 1000 psi (70 bar) at port 4 will result in a setting of 900 psi (63 bar) at port 1.
  • 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.
  • 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.
  • 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.
  • 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.
  • Cavity
  • Series
  • Capacity
    20 gpm
  • Maximum Operating Pressure
    5000 psi
  • Factory Pressure Settings Established at
    blocked control port (dead headed)
  • Maximum Valve Leakage at 110 SUS (24 cSt)
    3 in³/min.@1000 psi
  • Valve Hex Size
    1 1/8 in.
  • Valve Installation Torque
    45 - 50 lbf ft
  • Model Weight
    .30 lb
  • Seal kit - Cartridge
  • Seal kit - Cartridge
  • Seal kit - Cartridge
  • Seal kit - Cartridge

Model CAD Files

Click the link of the file format you want to download.

Symbol CAD Files

Click the link of the file format you want to download.

  • What parts of the Sun cartridge valve are field serviceable?
  • What are the tolerances on pressure settings for Sun's pressure control valves?
  • I need a reducer on B. Can I connect the drain to A?
  • How big is a drop of hydraulic oil?  
  • What do you mean by maximum differential?
  • Direct acting or pilot operated - what do I use?
  • Will your reducing/relieving valve relieve my pump to tank?
  • Can I back flow through a reducing valve from port 1 to port 2?
  • U3K ISO 05: Reducer/reliever on P
  • U3L ISO 05 - X&Y (Euro): Reducer/reliever on P
  • U3M ISO 05 - X&Y (US): Reducer/reliever on P

Keep up with Sun