DESCRIPTION
A screw-in, cartridge-style, remote sequence, pilot unloading valve, with optional fi xed
“unload/reload” pressure ratios for use in accumulator-type hydraulic systems.
OPERATION
In its steady state, the UP10-31 blocks fl ow from ➁ to ➂. On attainment of a
pre-determined pressure at
➀, the spool shifts to allow fl ow from ➁ to ➂.
Since the spring chamber is vented at
➂, back pressure at ➂ will directly (1:1) affect
the valve’s setting.
If pressure at
➀ drops to a level below the ratio-established reload value, the valve
will close, blocking fl ow from
➁ to ➂.
FEATURES
• Adjustments cannot be backed out of the valve.
• Adjustments prohibit springs from going solid.
• Spring range to 206 bar (3000 psi).
• Hardened spool and cage for long life.
• Industry common cavity.
RATINGS
Operating Pressure: 207 bar (3000 psi)
Flow: 3.8 lpm (1 gpm)
Ratio Between Unloading & Reloading Pressure: 60% ±5%; 70% ±5%; 80% ±5%
Pressure Setting Range: 69 to 207 bar (1000 to 3000 psi)
Temperature: -40 to 120°C with standard Buna 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: VC10-3; See page 9.110.1
Cavity Tool: CT10-3XX; See page 8.600.1
Seal Kit: SK10-3X-MM; See page 8.650.1
PRESSURE CONTROLS
UP10-31 Unloading Pilot, Internal Drain
SYMBOL
PERFORMANCE
(Cartridge Only)
6.903.1
4.1/60
4.8/70
2.7/40
3.4/50
1.4/20
2.1/30
0.7/10
0.95
0.25
1.89
0.50
A
C
B
2.84
0.75
FLOW lpm/gpm
PRESSURE DROP bar/psi
Piloted Fully Open
A=60% Ratio; B=70% Ratio; C=80% Ratio
32 cSt/150 sus oil at 40C
3.79
1.00
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®
Note: This valve, the UP10-31, is the replacement
for the obsolete UP10-30.
Blue rectangles are links to other catalog pages.
TO ORDERMATERIALS
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.
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. See page 8.010.1
DIMENSIONS
Porting
Cartridge Only 0
SAE 6 6T
SAE 8 8T
1/4 in. BSP* 2B
3/8 in. BSP* 3B
*BSP Body; U.K. Mfr. Only
UP10-31
6.903.2
Pressure Ratio
60 60% Ratio
70 70% Ratio
80 80% Ratio
†
Adjustable valves will be preset to
approx. 50% of spring max. potential.
UP10-31__ - __ __ __ - __ - __ __ - 30 / __ __
Adjustment Option
1/4 in. Hex Allen Head A
1-1/2 in. Dia. Alum Knob B
Option A w/Cover Cap C
Factory Preset Non-Adjst. F
Factory Preset
Hidden Adjustment H
(See page 6.003.1)
Option C
w/Lockwire Holes L
Seals
Buna N (Std.) N
Fluorocarbon V
25–27
34–37
Setting in bar
†
(Blank) for Adjustable, or
Specify, for example:
M69 69 bar
M207 207 bar
Setting in psi
†
(Blank) for Adjustable, or
Specify, for example:
10.0 1000 psi
23.5 2350 psi
®
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Blue rectangles are links to other catalog pages.
