HY-TS08-27 (Proportional Relief Valve)

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


The TS08-27 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 ±50 psi 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)

Rated flow

19 Lpm/5gpm;

DP=7.8 bar (113.3 psi) ± 10%, cartridge only, ① to ② coil energized

Flow path

Free flow: ① to ② coil energized;

Relieving: ① to ② coil de-energized


Less to 3%

Pressure rise

A: 40 psi/gpm; B: 50 psi/gpm; C: 28psi/gpm

Hydraulic fluid

Mineral oil, phosphate-ester


7.4 ~ 420 cSt (50 ~ 2000 sus)


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


HY08-2, see page H.1.2


Electrical specification

Max. Control current

12 VDC coils: 1.2A;

24 VDC coils: 0.6A

Relief pressure range

(from zero to max. Control current)

Minimum pressure is factory-adjusted.

Range a: 207-4.1bar (3000-60psi);

Range b: 138-4.1bar (2000-60psi)


See more