Internal thread gate valve, also known as shut-off valve, is the most widely used valve, which belongs to the forced sealing valve. Its closing principle is to make the sealing surface of the valve disc and the sealing surface of the valve seat closely fit and prevent the flow of media by relying on the pressure of the valve rod. It can be divided into several kinds according to different ways. The internal thread gate valve has the characteristics of simple structure, good sealing performance, large fluid resistance and poor regulation performance 1.It is simple in structure and convenient in manufacture and maintenance. 2.Small working stroke, short opening and closing time. 3.Good sealing performance, small friction between sealing surfaces and long service life.
