Valves - Pressure Controls - Pressure Reducing Valve - Direct Acting

PR50-38

PRESSURE REDUCING/RELIEVING CARTRIDGE VALVE

Overview

Description

The pr50-38xxx is 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 device for secondary circuits. Port 2 may be protected by 60 mesh, 250 micron rated screen with option s.

Operation

In its steady state, the pr50-38xxx 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 port 1, the cartridge shifts to block flow at port 2, thereby regulating pressure at port 1. In this mode, the valve will also relieve port 1 to port 3 at a variable value over the set reducing pressure.

Features

  • Adjustments cannot be backed out of the valve.
  • Adjustments prohibit springs from going solid.
  • Optional spring ranges to 227.5 bar (3300 psi).
  • Hardened spool and cage for long life.
  • Industry-common size.
Pressure Ratings
Pressure rating:
  • 344.7 bar (5000 psi) Ports 1 and 2
  • 68.9 bar (1000 psi) Port 3
Proof pressure:
  • 482.6 bar (7000 psi) Port 1
  • 482.6 bar (7000 psi) Port 2
  • 68.9 bar (1000 psi) Port 3
Burst pressure:
  • 1034 bar (15000 psi)
Flow Ratings
Flow rating:
  • See performance graphs
Temperature Ratings
Operating fluid temperature:
  • -40 to 100 °C (-40 to 212 °F) With buna N seals
  • -26 to 204 °C (-15 to 400 °F) With fluorocarbon seals
  • -54 to 107 °C (-65 to 225 °F) With polyurethane and urethane seals
Storage temperature:
  • -40 to 70 °C (-40 to 160 °F)
Ambient temperature:
  • -40 to 70 °C (-40 to 160 °F)
Other Ratings
Corrosion protection:
  • PR50-38XX 960 hr salt spray per ASTM b117
Fluids:
  • Mineral based or synthetic fluid with lubricating properties
Fluid viscosity range:
  • 7.4 to 420 cSt
Maximum operating contamination level:
  • 20/18/14 per ISO 4406 (tank port pressure is additive to pressure setting at ratio of 1:1)
Unit weight:
  • 0.27 kg (0.59 lb) A
  • 0.29 kg (0.64 lb) B
  • 0.31 kg (0.69 lb) C l
  • 0.26 kg (0.57 lb) F h
Internal wetted surface area:
  • 215 cm² (33.3 in²) A b c l
  • 195 cm² (30.2 in²) F h
PR50-38_PerfGraphs1(2022-02-24) PR50-38_PerfGraphs2(2022-02-24)
PR10-32_Dim(2022-02-24)
Cavity:
Cartridge installation torque:
  • 33.9 to 36.6 N-m (25 to 27 ft-lb)
  • 67.8 N-m (50 ft-lb) Maximum
H style plug torque:
  • 10.8 to 13.6 N-m (8 to 10 ft-lb)
Orientation restriction:
  • None
Seal kit:
  • SK10-3X-BM X=seal option
PR50-38_Order(2022-02-24)

Model Options

PR50-38DFG-H-J-R/S
D Rapid Response Option
CODE
DESCRIPTION
BLANK
Standard
R
Rapid Response
F Adjustment Option
CODE
DESCRIPTION
A
1/4" Hex Allen Head
B
1-1/2" Diameter Aluminum Knob with Aluminum Lock Knob
C
1/4" Hex Allen Head with Cover Cap
F
Factory Preset Non-Adjustable
H
Factory Preset Hidden Adjustment
L
1/4" Hex Allen Head with Cover Cap and Lockwire Holes
G Screen
CODE
DESCRIPTION
BLANK
NONE
S
60 Mesh Screen
H Line Body
CODE
DESCRIPTION
0
No Body
6T
Aluminum SAE 6
8T
Aluminum SAE 8
6TD
Ductile Iron SAE 6
8TD
Ductile Iron SAE 8
3B
Aluminum BSPP 3/8" (3)
3BD
Ductile Iron BSPP 3/8" (3)
J Seal
CODE
DESCRIPTION
N
Buna-N
V
Fluorocarbon
P
Polyurethane
U
PPDI Urethane
R Spring
CODE
DESCRIPTION
05
10.3 to 37.9 bar (150 to 550 psi) Spring Range
15
6.9 to 103.4 bar (100 to 1500 psi) Spring Range
21
27.6 to 144.8 bar (400 to 2100 psi) Spring Range
33
55.2 to 227.5 bar (800 to 3300 psi) Spring Range
S Setting
CODE
DESCRIPTION
MXXX
Spring Setting in XXX bar
XX
Spring Setting in XX psi (x 100)