There are many domestic manufacturers of gate valves, and most of the connection sizes are not uniform. Mainly divided into the following categories:
It is a general class based on JB/T2203-1999 “Structural Length of Gate Valve”. At present, most domestic valve manufacturers are designed and produced according to this standard. Manual gate valve working principle:
Turning the handwheel, through the advance and retreat of the thread of the handwheel and the valve stem, lifts or lowers the valve plate connected with the valve stem to achieve the function of opening and closing.
According to the shell/body material classification, gate valves can be divided into:
1. Metal material valve: such as carbon steel valve, alloy steel valve, stainless steel valve, cast iron valve, titanium alloy valve, Monel valve, copper alloy valve, aluminum alloy valve, lead alloy valve, etc.
2. Metal body lined valves: such as rubber-lined valves, fluorine-lined valves, lead-lined valves, plastic-lined valves, and enamel-lined valves.
3. Non-metallic material valve: such as ceramic valve, glass valve, plastic valve.