Contents
What does an actuator do on a control valve?
The actuator is the next logical area of interest. The operation of a control valve involves positioning its movable part (the plug, ball or vane) relative to the stationary seat of the valve. The purpose of the valve actuator is to accurately locate the valve plug in a position dictated by the control signal.
How do you control a steam valve?
Steam is supplied at a specific pressure to the upstream side of the control valve through which it passes to a heat exchanger, also operating at a specific pressure. Steam passes through the control valve and into the steam space of the equipment where it comes into contact with the heat transfer surfaces.
What is difference between actuator and valve?
Double acting pneumatic actuators require air to be used to move the piston in either direction. A solenoid valve is used to control the air flow into and venting of the actuator. Both Vane and Rack-n-pinion style double acting actuators have an constant, linear torque output throughout the stroke in both directions.
What controls an actuator?
In simple terms, it is a “mover”. An actuator requires a control signal and a source of energy. Its main energy source may be an electric current, hydraulic pressure, or pneumatic pressure. When it receives a control signal, an actuator responds by converting the source’s energy into mechanical motion.
Which valve is best for steam?
globe valve
By far the most widely used valve type for the automatic control of steam processes and applications is the globe valve. It is relatively easy to actuate, it is versatile, and has inherent characteristics well suited to the automatic control needs of steam.
How do you size a steam control valve?
Proportional control valves should be sized using a pressure drop through the valve of 80% gauge inlet pressure (PSIG) for low pressure steam systems. (Low pressure is generally defined as systems carrying 15 PSIG of less.) For steam pressures over 15#, recommended pressure drop is 50% of inlet gauge pressure.
What is the function of actuator?
An actuator is a part of a device or machine that helps it to achieve physical movements by converting energy, often electrical, air, or hydraulic, into mechanical force. Simply put, it is the component in any machine that enables movement.
What are steam valves?
Steam valves are used to control the flow and pressure level of steam and heated water vapor. Steam is used in a large number of industrial applications. It is used for powering turbines to generate electricity and for food, chemical and other product processing.
What is an electric ball valve?
Electric Ball Valves. Typically used for ON/OFF control of water, air, oil and other compatible media. Valworx electric ball valves use an electric actuator to open and close the valve. These valves are power-to-open and power-to-close.
What is an electric actuator?
An electric actuator or to be more precise an electric valve actuator, is a machine that converts electrical energy into rotary torque which is used to drive a valve.