Pressure Control Valves

CR08-28H — Relief Valve, Bi-Directional
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CR08-28H Valve

SYMBOL:
CR08-28H Valve symbol

 

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

OPERATION
The CR08-28H blocks flow from either port 1 or port 2. On attainment of a predetermined
pressure at either port 1 or 2, the spring-opposed poppet is forced from its seat. The cartridge
offers fast response to load changes in typical hydraulic circuits requiriing low hysteresis, low
pressure rise and low internal leakage.

FEATURES
• Factory preset hidden adjustment.
• Pressure setting range of 138-276 bar (2000-4000 psi)
• Corrosion-protection of 960 hours salt spray per ASTM B117.
• Hardened parts for long life.
• Industry common cavity.

RATINGS:
Operating Pressure: 276 bar (4000 psi)
Proof Pressure: 690 bar (10,000 psi)
Burst Pressure: 828 bar (12,000 psi)
Flow Rating: 38 lpm (10 gpm)
Crack Pressure Defined: bar (psi) evident at 0.95 lpm (0.25 gpm)
Maximum Internal Leakage: 1 ml/min. (20 drops/min)
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 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: VC08-2; See page 9.108_2w
Cavity Tool: CT08-2XX; See page 8.600.1
Seal Kit: SK08-2X-M; See page 8.650.1

 

 


PERFORMANCE:

CR08-28H Valve Performance Chart

 

DIMENSIONS:

CR08-28H Valve Dimensions

 

MATERIALS:

Cartridge: Weight: 0.24 kg (0.52 lb).
Steel with hardened work surfaces.
Zinc-plated exposed surfaces.

Standard Ported Body: Weight: 0.63 kg
(1.38 lb). Ductile iron, rated to 350 bar
(5075 psi). Aluminum bodiy available;
weight and dimensions may differ.
See page 8.008.1_2w.

 

ORDERING CHART:

CR08-28H Ordering Chart


Selection guide - similar valves.
PDF file of this page. Request a quote.