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40RA08-28 TYPE Relief, Direct-Acting Poppet

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A screw in, cartridge style, direct acting, differential area, poppet type, internally vented, bidirectional hydraulic relief valve intended for use as a pressure limiting device for common hydraulic circuit protection

Maximum pressure (bar / psi) : 276/ 4000

Peak flow (L/min / gpm) : 38 / 10 (See performance chart)

Cavity: VC08-2

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Serial Advantage

  • Adjustments cannot be backed out of the valve

  • Rapid response to pressure changes

  • Hardened parts for long life

Technical Specification

Maximum   pressure276 bar (4000 psi)
Peak flowSee performance chart
Internal   leakage≤ 1 mL/min (20 d/min) @ 85% of   setting pressure
Crack   pressure definedbar (psi) evident at 0.95 L/min   attained
CavityVC08-2 (See technical reference)
FluidMineral-based or synthetics with   lubricating properties
Viscosity   range7.4 to 420 mm2/s
Temperature   range-54 to 107 ℃ (Polyurethane   seals)
-40 to   100 ℃ (Buna N seals)
-26 to   204 ℃ (Fluorocarbon seals)
Degree of   fluid contaminationThe minimum pollution level is   ISO4406 level 18/16/13, and level
    15/13/11 is recommended to prolong the service life
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