Types of pneumatic valves
Pneumatic valves are valves driven by compressed air. Pneumatic valve procurement only clear specifications, categories, pressure to meet the procurement requirements of the practice, can be used to control air, water, steam, all kinds of corrosive media, mud, oil, liquid metal and radioactive media and other types of fluid flow.
Pneumatic valveIt is a valve driven by compressed air. Pneumatic valve procurement only clear specifications, categories, pressure to meet the procurement requirements of the practice, can be used to control air, water, steam, all kinds of corrosive media, mud, oil, liquid metal and radioactive media and other types of fluid flow. In the current market economy environment is not perfect. Because pneumatic valve manufacturers in order to product competition, each in the pneumatic valve unified design concept, different innovations, formed their own enterprise standards and product personality. Therefore, in the pneumatic valve procurement more detailed technical requirements, and manufacturers to achieve consensus, as the annex to the pneumatic valve procurement contract is very necessary. This type of valve in the pipeline should generally be installed horizontally.
The gate valve is used as a cut-off medium. When it is fully open, the whole flow is straight through. At this time, the pressure loss of the medium is very small. Gate valves are usually suitable for conditions that do not require frequent opening and closing and keep the gate fully open or fully closed. Not suitable for use as a regulator or throttle. For high-speed flow of the medium, the gate in the local open condition can cause the vibration of the gate, and vibration may damage the gate and valve seat sealing surface, and throttling will make the gate subjected to medium erosion. From the structural form, the main difference is the form of the sealing element. The valve stem opening or closing stroke is relatively short, and has a very reliable cut-off action, making this valve is very suitable for use as a medium cut or adjustment and throttling.
Once the cut-off valve is in the open state, its valve seat and valve sealing surface is no longer in contact, so its sealing surface mechanical wear is small, because most of the valve seat and valve is relatively easy to repair or replace the sealing element without removing the entire valve from the pipeline, which is suitable for the valve and pipeline welding into one occasion. Medium through such valves when the flow direction has changed, so the flow resistance of the valve is higher than other valves.
The butterfly plate of the butterfly valve is installed in the diameter direction of the pipeline. In the cylindrical passage of the butterfly valve body, the disc-shaped butterfly plate rotates around the axis, and the rotation angle is between 0 ° and 90 °. When rotating to 90 °, the valve is fully open. Butterfly valve structure is simple, small size, light weight, only by a few parts. And only need to rotate 90 ° to quickly open and close, simple operation, while the valve has good fluid control characteristics.
When the butterfly valve is in the fully open position, the thickness of the butterfly plate is the resistance when the medium flows through the valve body, so the pressure drop generated by the valve is very small, so it has good flow control characteristics. Butterfly valve has elastic seal and metal seal two types of sealing. Elastic sealing valve, the sealing ring can be embedded in the valve body or attached to the periphery of the butterfly plate.