Cast iron bottom valve fluid resistance small, sealing surface of erosion and erosion by the medium small main role is to prevent the backflow medium, prevent pump and its pattern in reverse driving voltage, and the discharge of the containers within the medium.Check valve can also be used to give the pressure could rise to more than the main system of auxiliary system supply piping.

Cast iron bottom valve has the following advantages
1. The fluid resistance small, sealing surface of erosion and erosion by the medium.
2. The hammer its waterproof performance is good, simple structure and low cost
The flow direction of medium (3) limited, only allowed to medium flows in one direction. 

4. Simple form, the structure length is short, make good manufacturability, wide application scope.

Keywords:butterfly valve ,knife gate valve,ball valve,globe valve,slurry gate valve