Learn about Piston Actuated Valves and its Applications

Piston-actuated valves use an external control media to pilot the actuator. The main seal that shuts onto the aperture is connected directly to a piston valve, which regulates the flow of liquids and gasses. Here are some more details about these valves.

Types of Piston Actuated Valves:

The piston valve can be classified into two groups based on how it operates: balanced type and unbalanced type. In contrast to unbalanced-type piston valves, which are meant for low-pressure applications, balanced-type piston valves are intended for use under high pressure.

How Does A Piston Valve Work?

Similar to a globe valve, a piston valve is utilized to shut off and control. It comprises two resilient valve rings, a metal piston, and a lantern bush. The surface involves the outer and inner surfaces of the sealing rings.

In order to control the low flow rate, a displacement at the opening exposes the narrow flow section. The majority of automatic valves are double-disc valves.

The double-disc construction makes it possible to distribute force across the seating surface as evenly as possible while directing it in the opposite direction.

When the valve is closed, the fluid pressure equalizes the flow pressure by pressing against the top and bottom of the top disc. An equalizing force ensures the valve operates smoothly even when it is open.


Power plants, refineries, pulp & paper mills, etc., employ piston valves principally for saturated and superheated steam and hot water distribution. Examples of particular applications include condensate manifolds, steam headers, desuperheaters, steam trap isolation, etc.

Final Thoughts

Are you thinking about where to buy piston valves? Here is your answer.

Since 1990, GPI has been producing valves for the oil and gas industries and has received certificates from the American Petroleum Institute with the API 6A and 6D designations and offering quality manufacturing valves.

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