The actuator valve is the “hand and foot” that automates the production process. It is installed at the production site and is in contact with the medium at all times to regulate the flow. What are the commonly used control valves and actuators? Today, I will introduce you to the principles and applicable applications of several actuators and some control valves commonly used in production.
1.motorized butterfly valve
The disc of the butterfly valve is a disc that rotates around an axis in the seat. The size of the angle of rotation is the degree of opening and closing of the valve.motorized butterfly valve actuator valves control fluid flow by controlling the size of the angle of rotation.
Advantages: light weight, simple structure, saving material compared with other valves, quick opening and closing, cutting and throttling can be used, fluid resistance is small, operation is labor-saving, and can be made into a large caliber.
Application: Butterfly valves are widely used in hot water lines. Where a butterfly valve can be used, it is best not to use a gate valve because the butterfly valve is more economical than the gate valve and has good regulation.
The diaphragm valve uses a valve stem to press the elastomer film against the valve seat to block the air path. Turning the handwheel can move the valve stem up and down, so that the diaphragm leaves the valve seat to open the valve or press the diaphragm against the valve seat to close the valve.
One is ultrapure water, and ultrapure water requires no dead angle in the circulation line;
Second, there are sewage, solution, etc., there are particles in the liquid, the ball valve is easy to wear and leak, and the diaphragm valve is closed up and down to avoid this problem. After long-term use, the diaphragm can be replaced.
Generally, diaphragm valves are recommended when using conditions or requiring strict sealing performance, mud media, wear, lightweight construction, low pressure cutoff (small pressure difference), small leakage to the atmosphere, and abrasive media. In the case of double position adjustment, throttling, adjustment, channel shrinkage, low noise, cavitation and vaporization, and small steering torque, diaphragm valves are available. In the case of high temperature medium, high pressure medium, high pressure cutoff (large differential pressure), fast opening and closing action, and short structure length, diaphragm valve is not used.
Angle valve: The valve body is rectangular, and there is a valve seat and sealing surface in the valve body, which is generally bottom-in and side-out.Angle electric actuator valves control the flow rate by controlling the scale of the valve opening.
Advantages: simple structure and good sealing effect. With self-cleaning function, the valve body is not easy to accumulate dirt, and should not be blocked. It is suitable for controlling high viscosity medium, high pressure difference and medium containing suspended matter and particulate matter.
Disadvantages: It is prone to unstable valve core oscillation.
The valve body has three nozzles, which are suitable for the pipeline control system of the three-direction fluid, and are mostly used for temperature regulation, ratio adjustment and bypass adjustment of the heat exchanger.
In use, it should be noted that the temperature difference of the fluid should not be too large, usually less than 150 °C, otherwise the three-way valve will generate a large stress, otherwise the three-way valve will cause large stress and cause deformation, resulting in leakage or damage at the joint.
The three-way valve has two types of three-way confluence valve and three-way diverter valve. The three-way confluence valve is that the medium flows into and mixes from two input ports and then flows out from an outlet. The three-way diverter valve flows into the medium from an inlet and is divided into Two outlets flow out.
All of the above valves can be controlled by electric actuator valves for flow control, meeting the standards of the automation industry.
Global valve network editing