HY-TS10-27 (Proportional Pilot-operated Relief Valve)

A screw-in, cartridge-style, pilot-operated, hydraulic relief valve, which can be infinitely adjusted across a prescribed range using a variable electric input. Pressure output is inversely proportional to DC current input. This valve is intended for use as a pressure limiting device in demanding applications.


The TS10-27 blocks flow from ① to ② until sufficient pressure is present at ① to open the valve by overcoming the preset induced spring force. With no current applied, the valve will relieve at ① 50psi of the spring maximum. Applying current to the coil reduces the induced spring force thereby reducing the valve setting. The regulated pressure is inversely proportional to the input electrical current.

Note: this valve is ideal for hydraulic fan drive applications. Please contact the manufactory for more information about electronic controller for fan drive applications.


Technical specification (for application beyond these parameters, please contact with us)



Installation position

When possible, the valve should be mounted below the reservoir oil level. This will maintain oil in the armature preventing trapped air instability. If this is not feasible, mount the valve horizontally for best results.

Storage temperature (℃)

-20℃ to +55℃

Ambient temperature (℃)

-20℃ to +50℃


Hydraulic specification

Max. operating pressure

241 Bar (3500psi)

Minimum operating

dither/ pulse frequency

75.7 Lpm (20gpm), DP=14.8 bar (215 psi) , cartridge only,

① to ②, coil energized

Flow path

Free flow: ① to ② coil energized;

Relieving: ① to ② coil de-energized

Max. Pilot flow

0.76 Lpm (0.2 gpm)


Less than 3%

Hydraulic fluid

Mineral oil, phosphate-ester


7.4 ~ 420 cSt (50 ~ 2000 sus)


-40℃~+120℃ (-40~250°F), with NBR seals


HY10-2, see page H.1.3


Electrical specification

Max. Control current

12 VDC coils: 1.10A;

24 VDC coils: 0.55A

Relief pressure range

(from zero to max. control current)

A: 207-10.3 bar (3000-150 psi);

B: 138-10.3 bar (2000-150 psi);

C: 69-10.3 bar (1000-150psi)



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