Valves - Pressure Controls - Relief Valve - Piloted - Spool Type

RV56-26

PILOT OPERATED RELIEF VALVE U.S. PATENT # 7,137,406

Overview

Description

RV56-26X is a screw in, cartridge style, pilot operated (two stage), spool type relief valve, intended for use as a pressure limiting device in demanding hydraulic circuits which require fast response and low hysteresis

Operation

The RV56-26X blocks flow from port 1 to port 2 until sufficient pressure is present at port 1 to force the piloting relief off its seat, allowing the main (second stage) spool to shift, opening port 1 to port 2

note: this valve cannot be used in cross-over relief applications

Features

  • 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 Ratings
Pressure rating:
  • 434.7 bar (6300 psi)
Proof pressure:
  • 620.5 bar (9000 psi)
Burst pressure:
  • 1379.0 bar (20000 psi)
Crack pressure defined:
  • Pressure evident at 7.6 lpm (2 gpm)
Reseat pressure:
  • Nominal 90% of crack
Relief pressure range:
  • 206.8 to 344.7 bar (3000 to 5000 psi)
Flow Ratings
Flow rating:
  • 378.5 lpm (100 gpm) At max pressure
Maximum internal leakage:
  • 492 ml/min (30 in³/min) At 85% of the pressure setting at 345 bar (5000 psi)
Temperature Ratings
Operating fluid temperature:
  • -54 to 107 °C (-65 to 225 °F) With polyurethane seals
Storage temperature:
  • -40 to 70 °C (-40 to 160 °F)
Ambient temperature:
  • -40 to 70 °C (-40 to 160 °F)
Fluids:
  • Mineral based or synthetic with lubricating properties
Fluid viscosity range:
  • 7.4 to 420 cSt
Maximum operating contamination level:
  • 18/16/13 per ISO 4406
Unit weight:
  • 0.58 kg (1.28 lb) A
  • 0.61 kg (1.34 lb) B
  • 0.63 kg (1.38 lb) C
  • 0.71 kg (1.56 lb) F h
Internal wetted surface area:
  • 273 cm² (42.3 in²) A b c
  • 308 cm² (47.7 in²) F h
RV56-26_Flow-Pressure
RV16-26_Dim

Materials

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.

Adjustment Option Details: See adjustment options

Cavity:
Cartridge installation torque:
  • 78.6 to 89.5 N-m (58 to 66 ft-lb)
H style plug torque:
  • 33.9 N-m (25 ft-lb)
Orientation restriction:
  • None
RV56-26_Order
POSITION
CODE
DESCRIPTION
RV56-26F-H-J-R/S
F
Adjustment Option
F
A
1/4" Hex Allen Head
F
B
1-1/2" Diameter Aluminum Knob with Aluminum Lock Knob
F
C
1/4" Hex Allen Head with Cover Cap
F
F
Factory Preset Non-Adjustable
F
H
Factory Preset Hidden Adjustment
F
L
1/4" Hex Allen Head with Cover Cap and Lockwire Holes
H
Line Body
H
0
No Body
H
12T
Aluminum SAE 12
H
16T
Aluminum SAE 16
H
12TD
Ductile Iron SAE 12
H
16TD
Ductile Iron SAE 16
H
6B
Aluminum BSPP 3/4" (6)
H
8B
Aluminum BSPP 1" (8)
H
8BD
Ductile Iron BSPP 1" (8)
J
Seal
J
N
Buna-N
J
V
Fluorocarbon
J
P
Polyurethane
R
Spring
R
50
48.3 to 344.7 bar (700 to 5000 psi) Spring Range
S
Setting
S
MXXX
Spring Setting in XXX bar
S
XX
Spring Setting in XX psi (x 100)