The difference between double acting and single acting Angle seat valve

Double-acting angle seat valves and single-acting angle seat valves are both types of pneumatic angle seat valves used in various applications for controlling the flow of liquids, gases, or steam. They are commonly found in industries such as food and beverage, chemical, pharmaceutical, and water treatment. The main difference between them lies in their actuation mechanisms.

1. Double-acting angle seat valve:

• The double-acting angle seat valve uses compressed air to open and close the valve. It requires air pressure to both open and close, meaning it has two separate air supply ports.

• When air pressure is applied to one side of the actuator, the valve opens, while applying air pressure to the opposite side of the actuator causes the valve to close.

• Double-acting angle seat valves are more suitable for applications where rapid and precise control is needed, as they offer faster response times and can handle a larger number of cycles.

• Since the valve relies on air pressure for both opening and closing, it will remain in its current position if the air supply is lost, which can be considered as a drawback in some applications.

1. Single-acting angle seat valve:

• The single-acting angle seat valve uses compressed air to actuate the valve in one direction (either opening or closing), while a spring is used to return the valve to its original position.

• Single-acting valves are also called spring return valves, as they rely on the spring force to either open or close the valve when the air pressure is released.

• These valves typically have one air supply port and require less air consumption than double-acting valves.

• In the event of air supply loss, the spring will automatically return the valve to its default position, providing a fail-safe mechanism (either fail-open or fail-close, depending on the configuration).

In summary, the main differences between double-acting and single-acting angle seat valves are the actuation mechanisms, response times, air consumption, and their behavior in case of air supply loss. The choice between the two types depends on the specific requirements of the application and the desired level of control and fail-safe functionality.