Hardware knowledge: advantages and disadvantages of gate valves

Gate valve has the following advantages:

The fluid resistance is small, and the sealing surface is less brushed and corroded by the medium.

It saves effort to open and close.

The flow direction of the medium is not restricted, does not disturb the flow, and does not reduce the pressure.

The shape is simple, the length of the structure is short, the manufacturing process is good, and the scope of application is wide.

The disadvantages of gate valves are as follows:

It is easy to cause erosion and scratches between the sealing surfaces, and it is difficult to maintain.

The overall size is large, a certain amount of space is required for opening, and the opening and closing time is long.

The structure is more complicated.

The type of gate width can be divided into wedge gate valve and parallel gate valve according to the sealing surface configuration. Wedge gate valve can be divided into: single gate, double gate and elastic gate; parallel; The sluice gate valve can be divided into single sluice type and double sluice type. Divided according to the thread position of the valve stem, it can be divided into two types: open stem gate valve and dark stem gate valve.

The installation and maintenance of gate valve should pay attention to the following matters:

Handwheels, handles and transmission mechanisms are not allowed to be used for lifting, and collisions are strictly prohibited.

The double gate valve should be installed vertically (that is, the valve stem is in the vertical position and the handwheel is on the top).

The gate valve with a bypass valve should be opened before opening (to balance the pressure difference between the inlet and outlet and reduce the opening force).

The gate valve with drive mechanism should be installed according to the product manual.

If the valve is frequently opened and closed, lubricate at least once a month