Hydraulic Piston Actuator HX


Omni Model HX hydraulic actuators are designed to operate surface safety or shutdown valves on oil & gas wellhead, transmission, storage, manifold or other applications where fail-safe capability is required.

Model HX actuators can be used for land or off shore installations and are engineered to provide reliable service in a variety of operating conditions.

Omni can provide Model HX actuators already mounted on valves and ready to deploy, or as actuated bonnet assemblies ready to mount on valves from other manufacturers. Omni also offers a full range of accessories including standard & fusible manual overrides, position indicators and fusible lock open devices.



Model HX actuators can be adapted to operate valves from any manufacturer (interface information is required) and can be delivered with alternate materials of construction if required by field conditions.

Over-Pressure Protection

Model HX actuators come equipped with pressure relief devices to protect personnel and guard against damage to the actuator in case of an over pressure condition. The pressure relief device is easily inspected and is field-replaceable.

Non-Pressurized Actuator Housing

Model HX actuators have outer housings that are structural and protective only – they are not under hydraulic pressure. This helps protect personnel and equipment in the event of damage to the outer housing.

Backseat & Packing Integrity

Model HX actuators incorporate bonnet assemblies that have an integrated metal-tometal backseat. A bonnet fitting can also be used to relieve any pressure that might be trapped between the backseat and stem packing after the backseat operation. A tattletale weep port is located above the packing to provide visual confirmation of stem seal integrity during operation. All Model HX ports can be used to pipe fugitive
emissions to a containment vessel, if required.

Corrosion Protection

Model HX actuator housings are internally and externally coated to prevent corrosion due to environmental conditions. All internal components are either stainless steel or are coated to prevent corrosion due to any contamination that might be present in the control pressure source.


Model HX actuators are designed for ease of maintenance. All non-metallic seals and other parts are easily replaceable. Omni stocks redress kits for all sizes of Model HX Actuators.

Orientation, Rotation & Ease of Piping

The orientation of the control pressure port can be rotated to any angle for ease of piping while the actuator is not pressurized.

Available Sizes

Model Size Stroke
HX 20 2 1⁄2” Up to 2 9⁄16” bore
HX 30 3 1⁄2” Up tp 4 1⁄16” bore
HX 40 4 1⁄2” Up to 4 1⁄16” bore
HX 60 6 1⁄2” Up to 7 1⁄16” bore
HX 90 9” Up to 7 1⁄16” bore
HX 110 11” Up to 7 1⁄16” bore