Common check valve
Document.write('') ​​check valve document.write('') is the document.write('') ​​check valve document.write('') The document.write('') ​​check valve document.write('') is widely used and has many types. The following is the common document.write('') ​​check valve document.write('') for water supply and heat . : 1. Spring type: the liquid is from bottom to top, relying on the pressure to lift the valve controlled by the spring. After the pressure disappears, the spring force presses the valve flap to close the liquid backflow. Commonly used for document.write('') ​​checkpoint document.write('') . 2, gravity type: similar to the spring type, relying on the valve's own gravity to prevent backflow. 3, swing type: liquid in the valve body through, relying on the pressure to open the side of the rotating valve flap, after the pressure is lost, the valve flap returns to its own weight, the reverse liquid pressure closes the valve flap. The other document.write('') ​​check valve document.write('') ( document.write('') ​​check valve document.write('') ), such as the document.write('') The return valve document.write('') , the human-defense explosion-proof valve and the liquid used document.write('') ​​check valve document.write('') principle is much the same.
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Document.write('') ​​Check valve document.write('') ​​is a one-way opening and closing valve that only prevents counterflow of fluid media on various types of piping or equipment. 