Precautions for installation of low temperature gate valve

1. before the installation of low-temperature gate valve, the valve cavity and sealing surface must be checked, and no dirt or sand is allowed to adhere;

2. bolts at all connecting parts shall be tightened evenly;

3. check that the packing parts shall be compacted to ensure the sealing of the packing and the flexible opening of the ram;

4. before installing the valve, the user must check the valve model, connection size and pay attention to the medium flow direction to ensure the consistency with the valve requirements;

5. when installing the valve, the user must reserve the necessary space for valve driving;

6. the wiring of the driving device must be carried out according to the circuit diagram;

7. the gate valve must be maintained regularly. It is not allowed to collide and squeeze at will to avoid affecting the sealing.

The types of gate valves can be divided into wedge gate valve and parallel gate valve according to the configuration of sealing surface. Wedge gate valve can also be divided into single gate * type, double gate plate type and elastic gate type; Parallel gate valve can be divided into single gate plate and double gate plate. According to the thread position of the valve stem, it can be divided into two types: rising stem gate valve and Non rising stem gate valve.

When the gate valve is closed, the sealing surface can be sealed only by the medium pressure, that is, the sealing surface of the gate valve is pressed against the valve seat on the other side by the medium pressure to ensure the sealing of the sealing surface, which is self sealing. Most gate valves adopt forced sealing, that is, when the valve is closed, the gate shall be forced to the valve seat by external force to ensure the tightness of the sealing surface.