Valves - Pressure Controls - Relief Valve - Crossover

CR08-38

BI-DIRECTIONAL RELIEF VALVE POPPET TYPE

Overview

Description

CR08-38X is a screw-in, cartridge style, direct acting, bi-directional, poppet type hydraulic relief valve for use as a pressure limiting device in more demanding hydraulic circuits, requiring low hysteresis and low internal leakage

Operation

The valve blocks flow from port 1 to port 2 bi-directionaly with the spring chamber constantly drained at port 3. On attainment of a pre-determined pressure at either port 1 or port 2, the spring-opposed poppet is forced from its seat

Features

  • Adjustments cannot be backed out of the valve.
  • Adjustments prohibit springs from going solid.
  • Hardened parts for long life.
  • Compact, industry-common size.
Pressure Ratings
Pressure rating:
  • 207 bar (3000 psi) Port 1
  • 207 bar (3000 psi) Port 2
  • 103 bar (1500 psi) Port 3
Proof pressure:
  • 448 bar (6500 psi)
Burst pressure:
  • 896 bar (13000 psi)
Reseat pressure:
  • 90% of crack pressure at
  • 0.95 lpm (0.25 gpm)
Flow Ratings
Flow rating:
  • 30.3 lpm (8 gpm)
Maximum internal leakage:
  • 0.4 ml/min (8 drops/min) At 75% of crack pressure
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
Storage temperature:
  • -40 to 70 °C (-40 to 160 °F)
Ambient temperature:
  • -40 to 70 °C (-40 to 160 °F)
Fluids:
  • Mineral based or synthetic with lubricating properties
Fluid viscosity range:
  • 7.4 to 420 cSt
Maximum operating contamination level:
  • 18/16/13 per ISO 4406
Unit weight:
  • 0.24 kg (0.54 lb) "a"
  • 0.28 kg (0.61 lb) "b"
  • 0.27 kg (0.60 lb) "c"/"l"
  • 0.25 kg (0.56 lb) "f"/"h"
Internal wetted surface area:
  • 159 cm² (24.6 in²) "a"/"b"/"c"/"l"
  • 176 cm² (27.3 in²) "f"/"h"
CR08-38_Flow-Pressure
CR08-38_Dim

Materials

Cartridge: Weight: 0.14 kg. (0.30 lbs.); Steel with hardened work surfaces. Zinc-plated exposed surfaces; Buna N O-rings and TFE back-up standard. Anodized aluminum knobs.

Standard Ported Body: Weight: 0.27 kg. (0.60 lbs.); Anodized high-strength 6061 T6 aluminum alloy, rated to 207 bar (3000 psi); Ductile iron bodies available; dimensions may differ.

Adjustment Option Details: See adjustment options

Note: Orifice Disc should not be used with this product.

Cavity:
Cartridge installation torque:
  • 25.8 to 28.5 N-m (19 to 21 ft-lb)
  • 47.5 N-m (35 ft-lb) Up to maximum of
H style plug torque:
  • 33.9.8 to 36.6 N-m (25 to 27 ft-lb)
Orientation restriction:
  • None
Seal kit:
  • SK08-3X-BM X = seal option
CR08-38_Order
POSITION
CODE
DESCRIPTION
CR08-38F-H-J-R/S
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
H
Line Body
H
0
No Body
H
4T
Aluminum SAE 4
H
6T
Aluminum SAE 6
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
10
3.4 to 68 bar (50 to 1000 psi) Spring Range
R
30
68 to 205 bar (1000 to 3000 psi) Spring Range
S
Setting
S
MXXX
Spring Setting in XXX bar
S
XX
Spring Setting in XX psi (x 100)