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) Port 1
344.7 bar (5000 psi) Port 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
Maximum 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

Cartridge 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
VC10-3
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
PR50-38FG-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