What Is a Rotary Valve?
Rotary valve, also known as star valve, is a regulating valve that changes the valve from an open position to a closed position by rotating a rotating component such as a rotating baffle by 90 degrees. Allows or cuts off the flow with a rotating part. A rotary valve that can rotate 90 degrees is called a 1/4 rotary valve. Sometimes the classification of 1/4 rotary valves can be extended to rotary valves with a rotation angle of less than 270 degrees.
Rotary valve
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- Chinese name
- Rotary valve
- Foreign name
- Rotary valve
- Category
- valve
- Classification
- Butterfly, ball and plunger valves
- Rotary valve, also known as star valve, is a regulating valve that changes the valve from an open position to a closed position by rotating a rotating component such as a rotating baffle by 90 degrees. Allows or cuts off the flow with a rotating part. A rotary valve that can rotate 90 degrees is called a 1/4 rotary valve. Sometimes the classification of 1/4 rotary valves can be extended to rotary valves with a rotation angle of less than 270 degrees.
- There are valves and fittings, they are all used in pipeline connection or control systems. Neither valves nor fittings can exist independently and complement each other. Valve fittings include carbon steel and stainless steel, as well as PVC, or other materials.The first two are commonly used. In recent years, with the improvement of people's living standards, the demand for non-staple food has also increased. So it has driven the rapid exhibition of food machinery, so the production of stainless steel sanitary valve fittings is booming. People usually say that valve fittings are mostly stainless steel sanitary grade.
- There are three types according to type classification: butterfly valve, ball valve and plunger valve.
- According to the operation mode, there are the following types: manual valve, automatic valve and regulating valve.
- 1. The valve should be stored in a dry and ventilated room, and both ends of the passage must be blocked.
- 2. Valves that have been stored for a long time should be checked regularly to remove dirt and coated with rust-proof oil on the processing surface.
- 3. After installation, it should be inspected regularly. The main inspection items are: 1) Wear of sealing surface. (2) The trapezoidal thread wear of the stem and stem nut. (3) Whether the packing is out of date, if it is damaged, it should be replaced in time. (4) After the valve is overhauled and assembled, the sealing performance test shall be performed.
- The valves in operation should be complete and intact. The bolts on the flange and the bracket are indispensable, and the threads should be intact and no looseness is allowed. The tightening nut on the handwheel should be tightened in time if looseness is found, so as not to wear the connection or lose the handwheel and nameplate. If the handwheel is lost, it is not allowed to replace it with a live wrench, and it should be equipped in time. Packing glands must not be skewed or have no pre-tensioning gap. For valves that are susceptible to contamination by rain, snow, dust, sand, etc., the valve stem should be equipped with a protective cover. The scale on the valve should be kept complete, accurate and clear. Valve seals, caps, pneumatic accessories, etc. should be complete. The insulation jacket shall be free of dents and cracks.
- It is not allowed to knock, stand on or support heavy objects on the valve in operation; especially non-metallic valves and cast iron valves are even more prohibited.
- After the casting of the rotary valve is completed, shot blasting must be performed. Generally, two types of shot blasting machines are suitable. Drum shot blasting machine, track shot blasting machine, and hook shot blasting machine. The first two are suitable for cleaning smaller valves. The latter is suitable for cleaning larger valves.