1. In order to prevent abnormal pressure rise in the middle cavity, pressure relief holes are installed on the inlet side of the gate.

2. Determine the top length of the valve cover according to the working temperature of the valve to ensure the reliable sealing of the stem packing.

3. According to the working temperature, the materials such as stuffing, gaskets and so on are selected reasonably.

4. Strictly control the chemical composition of materials and low temperature impact toughness and other mechanical properties.

5. Adopt a variety of pipe flange standards and sealing face type, suitable for all kinds of engineering needs.