1., according to the structure, there are four kinds of lifting check valves, swing check valves, butterfly check valves and diaphragm check valves. The corresponding products include pressure self sealing and lifting check valves, H44H rotary flange check valves, HH47 butterfly check valves.
(1) the structure of the pressure self sealing lift check valve is generally similar to that of the globe valve. The valve flap acts as a lifting and moving line along the channel, which is reliable, but has large fluid resistance. It is suitable for small and small caliber occasions. Lift check valve can be divided into two types: straight through lift check valve (usually installed in horizontal pipe) and vertical lift check valve (usually installed in vertical pipe).
(2) the rotary valve of the H44H rotary flange check valve rotates around the rotating shaft. Its fluid resistance is generally less than the lift check valve, which is suitable for large caliber occasions. Its applicable medium includes water, steam, oil, nitric acid, strong oxidizing medium and urea. It is widely used in power plant, oil, chemical, pharmaceutical, food and other industries, and can be used directly with imported equipment. The swing check valve can be divided into three kinds of valves according to the number of valves. Single swing check valves are generally applicable to medium caliber occasions. In order to reduce the pressure of water hammer, it is best to reduce the pressure of water hammer to reduce the pressure of water hammer when using the single valve swing check valve in large caliber pipeline. The double valve swing check valve is suitable for large and medium caliber pipelines. The double valve rotary start check valve has small structure and light weight, and it is a fast development check valve, and the multi valve swing check valve is suitable for large caliber pipeline.
(3) HH47 butterfly buffer check valve structure is similar to butterfly valve, for straight through type. Its structure is simple, the flow resistance is small, and the pressure of water hammer is also small.
(4) diaphragm type check valves have various structural forms. Diaphragm is used as opening and closing member. Because of its good performance, simple structure and low cost, it has developed rapidly in recent years. But the use temperature and pressure of the diaphragm check valve are limited by the diaphragm material.
2., according to the main material, there are cast iron check valves, brass check valves and stainless steel check valves. The corresponding products include H64W brass welding rotary check valve, vertical pure nickel check valve, titanium check valve and so on.
3., according to function, it can be divided into silent check valve, noise elimination check valve and so on. The corresponding products of our company include H41X type noise elimination check valve, H72X brass pair pinch check valve and so on.
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