single and double acting pneumatic ball valves difference between

Single and double action of pneumatic ball valve difference between (how to open the ball valve by pneumatic actuator)

Single acting and double acting pneumatic ball valves refer to the pneumatic actuators equipped with pneumatic ball valves, which can be divided into single acting and double acting. The difference is that there is a spring in the single acting cylinder, but there is no spring in the double acting cylinder. Therefore, the price of a single acting pneumatic actuator is higher than that of a double acting pneumatic actuator.

Single acting pneumatic actuators, single acting pneumatic actuators are generally divided into normally open and normally closed types (normally open type: vent off, air cut-off open; normally closed type: vent on, air cut-off closed). That is to say, there is a setting before installation, which is set to be on or off. If it is normally open, the pneumatic actuator closes the valve in the case of ventilation. If the air source fails or suddenly cuts off, The single acting pneumatic actuator is automatically reset to the on state by the spring, that is to say, it will return to its set state. If it is set to the off state, it will return to the off state. Generally, it is used more in dangerous working conditions, such as conveying combustible gas or liquid. In the event of an emergency due to the loss of gas source, the single acting pneumatic actuator can automatically reset to minimize the danger, but the double acting pneumatic actuator cannot reset.

The double acting pneumatic actuator opens the valve in the case of ventilation. When the valve needs to be closed, the ventilation on the other side can be closed. The double acting pneumatic actuator is reset by the operation of the cylinder, and can only stay in place when the air source is lost.