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.

Ratings

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

Operating Parameters

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)

Properties

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

Performance

PR50-38_PerfGraphs1 PR50-38_PerfGraphs2

Dimensions

PR10-32_Dim

Materials

Materials

Cartridge: Weight: 0.27 to 0.31 kg (0.59 to 0.69 lb) depending on adjustment type; Steel with hardened work surfaces. Zinc-plated exposed surfaces; Buna N O-rings and TFE back-ups standard. Anodized aluminum knob.

Standard Ported Body: Weight: 0.36 kg (0.80 lb); Anodized high-strength 6061 T6 aluminum alloy, rated to 207 bar (3000 psi); Ductile iron (code 'D') bodies are required for operation over 207 bar (3000 psi), dimensions may differ.

Adjustment Option Details: See adjustment options

Installation Specifications

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

Accessories

Seal kit:
  • SK10-3X-BM X=seal option

Order Code

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