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A screw-in, cartridge-style, direct-acting, spool-type, hydraulic pressure reducing/relieving valve, with internal spring-chamber drain and spool damping chamber. It is designed to act as a pressure regulating valve for secondary circuits. Internal damping makes this valve particularly suitable for use in circuits with unstable input flows in demanding applications requiring enhanced stability.
In its steady state, the PR50-38 allows flow to pass bidirectionally from port 2 to port 1, with the spring chamber constantly drained at port 3. Upon attainment of a predetermined pressure at 1, the spool shifts to block flow at 2, thereby regulating pressure at 1. In this mode, the valve will also relieve from port 1 to port 3, at a variable value over the set reducing pressure. Tank port pressure is additive to the pressure setting at a ratio of 1:1.
• Adjustments cannot be backed out of the valve.
• Adjustments prohibit springs from going solid.
• Optional spring ranges to 227.5 bar (3300 psi).
• Optional 233 micron screen at port 2.
• Industry common cavity.
Pressure Rating: 345 bar (5000 psi) at ports 1 and 2; 68.9 bar (1000 psi) at port 3; 241 bar (3500 psi) max for F and H Adjustment options.
Proof Pressure: 48.2 bar (7000 psi) at ports 1 and 2; 68.9 bar (1000 psi) at port 3
Burst Pressure: 1034 bar (5000 psi)
Regulated Pressure Range: 10.3 to 227.5 bar (150 to 3300 psi)
Maximum Rated Flow: See Performance Chart
Maximum Internal Leakage to Port 3: 82 ml per minute (5.0 cu. in. per minute)
Temperature: -40 to 100°C (-40 to 212°F) with standard Buna N seals;-26 to 204°C (-15 to 400°F) with fluorocarbon seals;-54 to 107°C (-65 to 225°F) with polyurethane seals
Filtration: See page 9.010.1
Fluids: Mineral-based or synthetics with lubricating properties at viscosities of 7.4 to 420 cSt (50 to 2000 sus); See Temperature and Oil Viscosity, page 9.060.1
Installation: No restrictions; See page 9.020.1
Cavity: VC10-3; See page 9.110.1
Cavity Tool: CT10-3XX; See page 8.600.1
Seal Kit: SK10-3X-BM; See page 8.650.1
PRESSU
ISO SYMBOL
6.454.1231
H
YDRA
F
ORCE.com®
RE CONTROLS9.7/1408.3/1206.9/1005.5/804.1/6015.1 422.7630.38FLOW lpm/gpmPRESSURE bar/psiFully Open Pressure DropPort 2 to Port 1 & Port 1 to Port 332 cSt/150 sus oil at 40°C37.9107.62ScreenNo Screen1.4/20138/2000110.3/160082.7/120055.2/80027.6/4000.1000.200TIME secondsPRESSURE bar/psiResponse To Inlet Pressure Step Time (sec.) Step Up: 0.040Inlet Pressure Port 2 to Port 1Supporting Valve Upstream Inlet Pressure StepsBetween 241.3 bar (3500 psi) and 10.3 bar (150 psi)Pressure Step Responsein Reducing Mode Time (sec)Step Up: 0.014 Step Down: 0.043 Inlet Pressure Port 2 to Port 1Supporting Valve Downstream Reducing Flow StepsBetween 0 lpm (0 gpm) and 18.9 lpm (5 gpm)138/2000110.3/160082.7/120055.2/80027.6/4000.0500.100TIME secondsPRESSURE bar/psi
