CR08-38 Bi-Directional Relief Valve, Vented (CR08-38)
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.
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.
NOTE: If pressure is applied simultaneously at port 1 and port 2, the pressure isadditive and may cause the valve to shift at a pressure lower than the pre setpressure setting.
Product Features
• Adjustments cannot be backed out of the valve.
• Adjustments prohibit springs from going solid.
• Hardened parts for long life.
• Industry common cavity.
Product Ratings
Maximum Operating Pressure: 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: 80% of Crack; Crack: 0.96 lpm (0.25 gpm)
Maximum Difference for Crack Pressure in Both Directions: 20.7 bar (300 psi)
Flow Range: 30 lpm (8 gpm); See performance chart
Maximum Internal Leakage: When reseat to 75% of crack pressure: 0.4 cc/minute (8 drops/minute maximum)
Cycle Limitations: Internal seal life is limited to 300,000 cycles in either direction at maximum setting
Temperature: -40 to 120°C with Buna N 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 9.108.1
Cavity Tool: CT08-3XX; See page 8.600.1
Seal Kit: SK08-3X-BM; See page 8.650.1
