Valves - Pressure Controls - Relief Valve - Piloted - Poppet Type with Reverse Check

RV50-28

RELIEF VALVE PILOT OPERATED U.S. PATENT 6,805,155 and 7,069,945

Overview

Description

The RV50-28X is a screw-in, cartridge style, pilot operated, relief valve with reverse free flow check valve, intended for use as a pressure limiting device in demanding hydraulic circuits which require fast response, low hysteresis, low leakage, low pressure override and reverse free flow features

Operation

The RV50-28X blocks flow from port 1 to port 2 until sufficient pressure is present at port 1. Relief flow path from port 1 to port 2. Reverse flow from port 2 to port 1 occurs when pressure at port 2 is higher than pressure at port 1

Features

  • Rated for higher operating pressure 345 bar (5000 psi).
  • Variety of adjustment options; adjustments cannot be backed out of the valve.
  • Can be operated in relief valve mode or check valve mode.
  • Reverse flow check valve built-in.
  • Hardened spool and cage for long life.
  • Fast response.
  • Industry-common cavity.
Pressure Ratings
Pressure rating:
  • 344.7 bar (5000 psi) Port 1
  • 68.9 bar (1000 psi) Port 2
Proof pressure:
  • 620.5 bar (9000 psi) Port 1
Burst pressure:
  • 1275.5 bar (18500 psi) Port 1
Adjustable pressure range:
  • 13.8 to 344.7 bar (200 to 5000 psi)
Crack pressure defined:
  • Pressure evident at 7.6 lpm (2.0 gpm)
Reseat pressure:
  • Nominal 90% of crack pressure
Crack pressure:
  • 2.1 bar (30 psi) Check valve mode
Approximate pressure increment per adjuster turn:
  • 98.6 bar (1430 psi)
Flow Ratings
Flow rating:
  • 113.6 lpm (30 gpm) Port 1 to 2
Maximum internal leakage:
  • 0.53 ml/min (10 drops/min) Max 80% of nominal setting
Other Ratings
Response:
  • 0.06 s RV to CV at 241 bar (3500 psi) 53 lpm (14 gpm)
  • 0.3 s CV to RV at 241 bar (3500 psi) 53 lpm (14 gpm)
Temperature Ratings
Operating fluid temperature:
  • -40 to 100 °C (-40 to 212 °F) With buna N seals
  • -26 to 204 °C (-15 to 400 °F) With fluorocarbon seals
  • -54 to 107 °C (-65 to 225 °F) With polyurethane seals
  • -54 to 107 °C (-65 to 225 °F) With urethane 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:
  • 0.27 kg (0.59 lb) A
  • 0.29 kg (0.64 lb) B
  • 0.31 kg (0.68 lb) C l
  • 0.244 kg (0.54 lb) F
  • 0.240 kg (0.53 lb) H
Internal wetted surface area:
  • 197 cm² (30.6 in²) A b c l
  • 174 cm² (26.9 in²) H f
RV50-28_Flow-Pressure
RV50-28_Dim

Materials

Cartridge: Weight:

Cavity:
Cartridge installation torque:
  • 47.6 to 50.1 N-m (35 to 37 ft-lb)
Maximum allowable torque:
  • 67.8 N-m (50 ft-lb)
H style plug torque:
  • 33.9 N-m (25 ft-lb)
Orientation restriction:
  • None
Seal kit:
  • SK10-2X-B X = n, v, P seal option
  • SK10-2U-O
RV50-28_Order
POSITION
CODE
DESCRIPTION
RV50-28F-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
6T
Aluminum SAE 6
H
8T
Aluminum SAE 8
H
6TD
Ductile Iron SAE 6
H
8TD
Ductile Iron SAE 8
H
2B
Aluminum BSPP 1/4" (2)
H
3B
Aluminum BSPP 3/8" (3)
H
4B
Aluminum BSPP 1/2" (4)
H
4BD
Ductile Iron BSPP 1/2" (4)
J
Seal
J
N
Buna-N
J
V
Fluorocarbon
J
P
Polyurethane
R
Spring
R
50
17.2 to 344.7 bar (250 to 5000 psi) Spring Range
S
Setting
S
MXXX
Spring Setting in XXX bar
S
XX
Spring Setting in XX psi (x 100)