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Pressure Control Valves

UP10-31 — Unloading Pilot, Internal Drain

Selection guide - similar valves.
PDF file of this page.
STP file for UP10-31.
Request a quote.

UP10-31 Valve

UP10-31 Valve symbol

A screw-in, cartridge-style, remote sequence, pilot unloading valve, with optional fixed
“unload/reload” pressure ratios for use in accumulator-type hydraulic systems.

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

• 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.

Operating Pressure: up to 207 bar (3000 psi)

Flow: up to 3.8 lpm (1 gpm); see performance chart
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 100°C (-40° to 212°F) with Buna seals;
   -26° to 204°C (-15° to 400°F) with Fluorocarbon 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_3w
Cavity Tool: CT10-3xx; See page 8.600.1
Seal Kit: SK10-3x-MM; See page 8.650.1


UP10-31 Flow Pressure
UP10-31 Valve Dimensions


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.
See page 8.010_3w.

Adjustment Option Details:
See page 6.003.1



UP10-31 Ordering Chart

Selection guide - similar valves.
PDF file of this page. STP file for UP10-31 Request a quote.

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