OHQ Series are explosion-proof, intelligent quarter turn electric actuators for the accurate control of valves with torques upto 2000 N.m. OHQ explosion-proof is designed for on/off or modulating control of butterfly, ball, rotary plug valves or dampers in a wide range of heavy industrial, chemical and petrochemical plants, on and offshore. It can be driven by 380N/220V/110V AC power or 24V/110V DC power, inputs 4-20mA current signal or 0-10V DC voltage signal as control signal (CE and EX certificates Approved)

Performance Features

Shell -The shell is made of aluminum alloy, with anodic oxidation treatment and polyester powder coating. It is strong corrosion-resistant and enclosure IP67,NEMA 4 and 6, IP68 and explosion-proof is optional.

Motor -Asynchronous motor, small, large torque, and small inertia force, F-class insulation rating, with thermal protection to avoid damaging.

Manual Structure -The design of handwheel is safe, reliable, labor-saving, small. Declutch to operate by handwheel if without power, and reset automatically when power on.

Space heater - It is used for controlling temperature to avoid condensing internal of housing and keep dry.

Limit switch- Mechanical, electronic double limit. Mechanical limit stopper is adjustable, safe and reliable; electronic limit switch is controlled by cam. Set position accurately and conveniently, and not affected by excessive handle.

Torque Switch - (Except OHQ-005/008/010) Providing overload protection to avoid the damage of valve and electric actuator when jammed by cutting power automatically.

Anti-off bolt—The bolt attaches to the shell and be not off when remove the shell.

Installation - The installation size meets international standard ISO5211 / DIN3337.

Circuit -Controlling circuit meets the single-phase or three-phase power supply standard, circuit layout is reasonable and compact, terminals meet various of additional functional requirements effectively.

The display of valve position —During the opening or closing movement of actuator, the change of valve position on LCD is displayed with large numbers.


Power Supply 110/220V AC, 1 Phase; 380/440V AC, 3 Phase; 50/60 HZ, ±10%
Power supply of Control 110/220V AC, 1 Phase; 50/60HZ, ±10%
Motor Squirrel-cage Asynchronous Motor
Limit Switch 2* on/off, SPDT, 250V AC, 10A
Auxiliary Limit Switch 2* on/off, SPDT, 250V AC, 10A
Stroke 90° ± 10° Option: 0°–270°
Failure Protection Temperature Internal thermal protection; On: 120°C + 5°C, off: 97°C ± 15°C
Indicator Continuous position indicate
Manual Operation Mechanical handle (option: handwheel)
Self-lock Devise Self-lock by worm and worm gear
Mechanical Limit External adjusting bolts (2 pieces)
Heater and Thermostat 7-10W (110/220V AC), Anti-condensation
Connecting hole M18 (2pieces)
Ambient Temperature -20°C ~+70°C
Lubrication Aluminum-base grease (EP, type)
Material Steel, Aluminum alloy, Aluminum bronze, Poly carbonate
Ambient Humidity Max 90% RH
Anti-vibration X Y Z 10g, 0.2~34HZ, 30 minutes
External Coating Dry powder, Epoxy polyester


Diagram & Dimension