There are many manufacturers of gate valves in China, even The connection size is also mostly not uniform. Mainly divided into the following major categories: JB/T2203-1999 "gate valve structure length" based on the general category. At present, most domestic safety valve manufacturers are designed and produced according to this standard.
The working principle of the manual gate valve: turning the hand wheel, through the advancement and retreat of the thread of the hand wheel and the valve stem, lifting or lowering the valve plate connected with the valve stem to achieve the function of opening and closing.
Classified by housing/body material, gate valves can be divided into:
Metal material valves: such as carbon steel valves, alloy steel valves, stainless steel valves, cast iron valves, titanium alloy valves, Monel valves, copper alloy valves, lead alloy valves, etc.
Metal valve body lining valves: such as rubber-lined valves, fluorine-lined valves, lead-lined valves, lined plastic valves, lining enamel valves.
Non-metallic valve: such as ceramic valves, glass valves, plastic valves.