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.

Ratings

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)

Operating Parameters

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

Properties

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

Performance

RV56-26_Flow-Pressure

Dimensions

RV16-26_Dim

Materials

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

Installation Specifications

Cavity
VC16-2
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

Accessories

Order Code

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
206.8 to 344.7 bar (3000 to 5000 psi) Spring Range
S
Setting
S
MXXX
Spring Setting in XXX bar
S
XX
Spring Setting in XX psi (x 100)
RV56-26_Order