Single line gate valve performance advantages and disadvantages

Understand single line gate valve performance advantages and disadvantages, relative to the name we were unfamiliar, single line is one of the single gate valve gate valve, because of its two parallel to the sealing surface of the gate, the center line of the valve seat sealing surface is perpendicular to the pipe. Single line gate valve performance advantage. 1, small fluid resistance. 2, open and close the required external force is small. 3, the flow of medium is not restricted. 4, wide open, the sealing surface erosion by working medium is smaller than globe valves. 5, is relatively simple, the casting process is better. Deficiencies 1 open height are larger, size and shape. Install the required space. 2, in the process of opening and closing, has the relative friction sealing surface, easy to cause scratches. 3, gate valve, generally there are two seal face, adds some difficulties to machining, grinding and maintenance.