RV56-26 Relief, Pilot-Operated, High Pressure (RV56-26)
A screw-in, cartridge-style, pilot-operated (two-stage), spool-type hydraulic relief valve, intended for use as a pressure limiting device in demanding hydraulic circuits which require fast response and low hysteresis.
Product Operation
The RV56-26 blocks flow from ➀ to ➁ until suffi cient pressure is present at ➀ to force the piloting relief off its seat, allowing the main (second stage) spool to shift,
opening ➀ to ➁. The cartridge offers smooth transition in response to load changes in demanding hydraulic circuits.
NOTE: The RV56-26 cannot be used in cross-over relief applications.
Product Features
• Adjustments cannot be backed out of the valve.
• Adjustments prohibit springs from going solid.
• Hardened spool and cage for long life.
• Fast, smooth response to pressure surges.
Product Ratings
Rated Pressure Range at Crack: 207 to 345 bar (3000 to 5000 psi)
Crack Pressure Defi ned: bar (psi) evident at 7.57 lpm (2.0 gpm) attained.
Reseat Pressure: Nominal 90% of crack pressure.
Flow: See Performance Chart
Internal Leakage: Measured under 85% of pressure setting at 38°C (100°F):213 ml/minute (13 cu. in./minute).
Spring Range: Model Code 50: 206.8 to 344.7 bar (3000 to 5000 psi)
Operating Temperature: with polyurethane seals: -54°C to 107°C
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: VC16-2; See page 9.116.1
Cavity Tool: CT16-2XX; See page 8.600.1
Seal Kit: SK16-2P-B; See page 8.650.1
