Advantages and disadvantages of various valves_Globe valve

Stop valve: refers to the valve whose closing part (disc) moves along the center line of the valve seat. According to this movement form of the valve disc, the change of the valve seat opening is in direct proportion to the stroke of the valve disc. Because the opening or closing stroke of the valve stem of this kind of valve is relatively short, and has a very reliable cutting function, and because the change of the valve seat opening is in direct proportion to the stroke of the valve disc, it is very suitable for the regulation of flow. Therefore, this type of valve is very suitable for cut-off or regulation and throttling.

advantage:

① In the process of opening and closing, the friction force between the valve disc and the sealing surface of the valve body is smaller than that of the gate valve, so it is wear-resistant.

② The opening height is generally only 1 / 4 of the valve seat channel, so it is much smaller than the gate valve;

③ Generally, there is only one sealing surface on the valve body and disc, so the manufacturing process is relatively good and easy to maintain;

④ As the filler is generally a mixture of asbestos and graphite, the temperature resistance grade is high. General steam valves use stop valves.

Disadvantages:

① As the flow direction of the medium through the valve has changed, the minimum flow resistance of the stop valve is also higher than that of most other types of valves;

② Due to the long stroke, the opening speed is slower than that of the ball valve.