Pressure Control Valves

RV56-26 — Relief, Pilot-Operated, Spool-Type, High Pressure Valve
  Selection guide - similar valves.
  PDF file of this page.
  STP file for RV56-26
  Request a quote.

RV56-26 Valve
U.S. Patent 7,137,406

RV56-26 Valve symbol


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.

The RV56-26 blocks flow from 1 to 2 until sufficient pressure is present at 1 to force the
pilot relief off its seat, allowing the main stage to shift, opening 1 to 2. 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.

• Adjustments cannot be backed out of the valve.
• Adjustments prohibit springs from going solid.
• Hardened spool and cage for long life.
• Rapid, smooth response to pressure surges.

Pressure Rating: 345 bar (5000 psi)
Proof Pressure: 620.5 bar (9000 psi)
Burst Pressure: 1241 bar (8000 psi)
Crack Pressure Defined: bar (psi) evident at 7.6 lpm (2.0 gpm) attained
Reseat Pressure: Nominal 90% of crack pressure
Flow: up to 379 lpm (100 gpm)
Relief Pressure Range: 206.8 to 344.7 bar (3000 to 5000 psi)
Spring options shown in To Order section. Due to manufacturing tolerances, it may be
possible to adjust the valve either lower or higher than the nominal rating shown. If the
valve is adjusted beyond the recommended maximum pressure range for the
F and H style adjuster options, the valve may not open to relieve system pressure.

Leakage at Port 2 under 85% of Max Crack: 492 ml/min (30 max

Temperature: -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: VC16-2; See page 9.116_2w
Cavity Tool: CT16-2xx; See page 8.600.1
Seal Kit: SK16-2P-B; See page 8.650.1




RV56-26 Flow-Pressure



RV56-26 Valve Dimensions



Cartridge: Weight: 0.56 to 0.63 kg
(0.71 to 1.38 lb) depending on adjustment
option. Steel with hardened work surfaces.
Zinc-plated exposed surfaces. Polyurethane
seals standard. Anodized aluminum knobs.

Standard Ported Body: Ductile iron body standard. Consult factory for weight.
See page 8.016_2w.

Adjustment Option Details:
See page 6.003.1



RV56-26 Ordering Chart

Selection guide - similar valves.
PDF file of this page. STP file for RV56-26 Request a quote.