What is the control valve driver?

The control valve drive is a device used on the valve to accurately place the plug, ball or shoulder blade in the stationary valve seat, as dictated by the control system. The control valves are necessary for adjustable inspection and are widely used in the chemical processes industry. The most common type is the pneumatic controller, but often used electric, electrohydraulic and manual controls. Pneumatic control valve controls are generally preferred for their simplicity of construction and low cost compared to electric and hydraulic models. Valves that require air pressure opening are called air-opened or air-to-door valves. Valves that require air pressure are known as air-cled valves or air valves. Pneumatic control types include a piston model that can be double -acting and can work at high pressure, and the membrane model that is one acting. In case the supplied obviousTroja air lost or disconnected, these valves fail in a closed position. Air-core drive valves are also known as reverse valves. As expected, these valves fail in open position if the air is lost. When designing new processes, it is important that the engineers consider the effects of air loss in the device and choose the correct control valve control to ensure the process safety of the process in an emergency.

Although pneumatic controls are often used for their reliability and simplicity, the process conditions can determine that another type of control valve driver will be used. For example, electrohydraulic controls can be used in isolated areas where the air cannot be supplied. Electrohydraulic controls are more expensive than pneumatic controls.

Electrical drivers share many advantages with electrohydraulic controls. Instead ofHowever, the use of pumps and hydraulic fluids operates by supplying the current to an electric motor that opens or closes the control valve by means of a gearbox. Although it is not as popular as the drive of the pneumatic control valve, the electrical drivers gain popularity in the chemical processes industry from their development.

For processes that do not require strict control, the hand control valve drive may be sufficient. The manual driver must be modified manually, usually using a flywheel. During maintenance activities they are often used on bypass lines and although they are not as accurate as automatic control valves, they are usually much cheaper.