Air Operated Valve Diagram

Epri has developed an app for droid tablets that allows nuclear plant operators to understand air operated valve aov components.

Air operated valve diagram.

Directional air control valves are the building blocks of pneumatic control. 5 3 air operated valve pressure center. When energized the valve will shift it s flow paths and lower the axle. The most common diaphragm valves use pneumatic actuators.

They can also be used in environments unsuitable for electric devices such as inflammable atmospheres. The pilot valve delivers compressed air to a small air cylinder inside the valve. Manual override knob detented air pressure shifts the valve electric on axle down 1. They create two actions and have two exhaust ports which allows you to control the speed of each action by attaching a flow control valve to each exhaust port.

Symbols show the methods of actuation the number of positions the flow paths and the number of ports. Fluid power valves when electrically operated by a solenoid are drawn in the de energized position. Note that in figure 24 the operator of the valve is not identified but like a standard process fluid valve the valve could be operated by a diaphragm motor hydraulic solenoid or manual operator. Internal pilot 1 8 3 5 2 4.

Pneumatic circuit symbols representing these valves provide detailed information about the valve they represent. In order to do this an additional pilot valve is used. As solenoids are not used heat is not generated by the actuator making them suitable for use with fluids sensitive to changes in temperature. Speed controller meter out speed cotroller in line.

Diaphragm valves can be controlled by various types of actuators e g. These are pneumatically driven valves. 5 3 air operated valve with integrated check valve. This type of valve is one of.

4 way solenoid spring return air operated manual internal override dual pressure application. The compressed air in this cylinder pushes against the piston and actuates the solenoid to switch the valve. Shown in the de energized condition. Mechanical and air operated valves.

Mechanical and air operated valves. The 2 way air operated valves can be either normally closed or normally opened. Types are 2 way 3 way and 4 way. This video offers a glimps.

These valves close all ports in the off position to stop equipment in a locked position with air pressure holding it in place. This pilot valve is a small direct operated 3 2 way valve. Manual pneumatic hydraulic electric etc. In this type of valve air pressure is applied through a pilot valve into the actuator which in turn raises the diaphragm and opens the valve.