Valves - Pressure Controls - Unloading Valve

UP10-31

PRESSURE UNLOADING VALVE

Overview

Description

The UP10-31 is a screw in, cartridge style, remote sequence, pilot unloading valve, with optional fixed unload/reload pressure ratios of 60%, 70% or 80% for use in accumulator type hydraulic systems

Operation

In its steady state, the UP10-31 blocks flow from port 2 to port 3. On attainment of a predetermined pressure at port 1, the spool shifts to allow flow from port 2 to port 3. Since the spring chamber is vented at port 3, back pressure at port 3 will directly (1:1) effect the valve setting. If pressure at port 1 drops to a level below the ratio established reload value, the valve will close, blocking flow from port 2 to port 3

Features

  • Adjustments cannot be backed out of the valve.
  • Adjustments prohibit springs from going solid.
  • Optional spring ranges to 207 bar (3000 psi).
  • Hardened spool and cage for long life.
  • Industry-common size.

Ratings

Pressure Ratings
Pressure rating
207 bar (3000 psi) Port 2, port 3
250 bar (3625 psi) Port 1
Loading and unloading pressure ratio
At
1 gpm
3000 psi
Pressure setting
69 to 207 bar (1000 to 3000 psi)
Flow Ratings
Flow rating
3.8 lpm (1 gpm)
Maximum internal leakage
0.1 ml/min (2 drops/min) From port 1 to 2 at max pressure
Temperature Ratings
Maximum 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
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 hydraulic fluid with lubricating properties
Fluid viscosity range
7.4 to 420 cSt
Maximum operating contamination level
20/18/14 per ISO 4406

Properties

Cartridge weight
0.27 kg (0.58 lb) A
0.29 kg (0.64 lb) B
0.31 kg (0.68 lb) C
0.26 kg (0.57 lb) F
0.26 kg (0.56 lb) H
0.31 kg (0.68 lb) L
Internal wetted surface area
166 cm² (25.8 in²) A b c l
187 cm² (28.9 in²) F h

Performance

UP10-31_Flow-Pressure

Dimensions

UP10-31_Dim

Materials

Cartridge: Weight: 0.27 kg. (0.60 lbs.); Steel with hardened work surfaces. Zinc-plated exposed surfaces; Buna N O-rings and polyester elastomer back-ups standard. Anodized aluminum knobs and caps.

Standard Ported Body: Weight: 0.36 kg. (0.80 lbs.); Anodized high-strength 6061 T6 aluminum alloy, rated to 207 bar (3000 psi); Ductile iron bodies available; dimensions may differ.

Adjustment Option Details: See adjustment options

Installation Specifications

Cavity
VC10-3
Cartridge installation torque
34 to 37 N-m (25 to 27 ft-lb)
Plug torque
34 to 37 N-m (25 to 27 ft-lb)
Orientation restriction
None

Accessories

Seal kit
SK10-3X-BM X = seal option

Order code

POSITION
CODE
DESCRIPTION
UP10-31F-H-J-NR/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
3B
Aluminum BSPP 3/8" (3)
H
3BD
Ductile Iron BSPP 3/8" (3)
J
Seal
J
N
Buna-N
J
V
Fluorocarbon
J
P
Polyurethane
J
U
PPDI Urethane
N
Ratio
N
60
60% Ratio
N
70
70% Ratio
N
80
80% Ratio
R
Spring
R
30
68.9 to 206.8 bar (1000 to 3000 psi) Spring Range
S
Setting
S
MXXX
Spring Setting in XXX bar
S
XX
Spring Setting in XX psi (x 100)
UP10-31_Order