CR08-38 Hydraulic Pressure Control Valve

Pressure Control Valves

CR08-38 — Relief Valve, Bi-Directional, Vented

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CR08-38 Valve

SYMBOL:
CR08-38 Valve symbol

DESCRIPTION
A screw-in, cartridge-style, direct-acting, differential area, poppet-type, bi-directional
relief valve intended for use as a pressure limiting device in demanding hydraulic circuits.

OPERATION
The CR08-38 is a direct-acting, dual cross-over relief valve in a single cartridge format.
It blocks flow from 1 to 2 bi-directionally, with the spring chamber constantly drained at 3.
On attainment of a pre-determined pressure at either 1 or 2, the poppet is forced from its seat.
Back pressure on port 3 will affect the nominal setting on a 2:1 basis.

FEATURES
• Adjustments cannot be backed out of the valve.
• Adjustments prohibit springs from going solid.
• Hardened parts for long life.
• Compact, industry-common size.

RATINGS:
Operating Pressure: up to 205 bar (3000 psi)
Adjustable Pressure Range: 68 � 205 bar (1000 � 3000 psi); Pressure is set at port 2
Proof Pressure: 345 bar (5000 psi)
Reseat Pressure: 90% of crack (crack pressure at 0.96 lpm/0.25 gpm)
Maximum Difference for Crack Pressure in Both Directions: 20.7 bar (300 psi)
Flow: up to 30 lpm (8 gpm); see performance chart
Internal Leakage: when reseat to 75% of crack pressure: 0.4 cc/minute (8 drops/minute) max.
Cycle Limitations: Internal seal life limited to 300,000 cycles in either direction at max. setting
Temperature: -40° to 100°C (-40° to 212°F) with Buna seals;
-26° to 204°C (-15° to 400°F) with Fluorocarbon 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: VC08-3; See page 9.108_3w
Cavity Tool: CT08-3xx; See page 8.600.1
Seal Kit: SK08-3x-BM; See page 8.650.1

PERFORMANCE:

CR08-38 Flow-Pressure

DIMENSIONS:
CR08-38 Valve Dimensions

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.
See page 8.008_3w.

Adjustment Option Details:
See page 6.003.1

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

ORDERING CHART:

CR08-38 Ordering Chart