Sanitary Gate Valve Main Structural Features and Functions

Sanitary gate valve's main duty is to cut off. When it is fully open the entire pipe gets straight through. At this time the pressure loss of medium operation reaches minimum. Its main advantage is the small fluid flow resistance. It is usually not required to frequently open and close or to keep the gate fully open or fully closed. It is not suitable for regulation, throttling use. If used for long-term regulation, the sealing surface is easily washed away by media erosion, which affects the sealing performance.

Gate valve opening and closing the valve seat and valve seat sealing surface always contacts and gets friction. Therefore, the sealing surface is easy to wear. Especially for the valve approaches to fully closed state, the spool pressure difference in front and behind is quite great, thus the sealing surface wear is even more serious. Gate valve sealing surface has a certain self-sealing ability. Its spool is pressed against the seat sealing surface by media pressure. It is easily stuck when it is forced to close or temperature changes too much. Therefore, gate valves used in high temperature or high pressure wedge conditions, have taken certain measures to prevent stuck.

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