What are the technical considerations in choosing a valve?

The sealing performance of valve refers to the ability of sealing parts of valve to prevent media leakage, which is the most important technical performance index of valve. valve has three sealing positions: the contact between the opening and closing parts and the two sealing surfaces of the valve seat; the matching place between the packing and the valve stem and the stuffing box; the connection between the valve body and the valve cover.

After the medium flows through the valve, there will be a pressure difference between the front and rear, which makes the valve have a certain resistance to the flow of the medium. The medium consumes a certain amount of energy to overcome the resistance of the valve. Therefore, when designing and manufacturing the valve, it is necessary to reduce the valve flow as much as possible. The resistance of the medium reduces the loss of energy.

Switching power refers to the force that must be applied to open or close the valve,When designing and manufacturing valves, we should strive to reduce their switching power.

The opening and closing speed is expressed by the time required for the valve to complete an opening or closing action.Generally, there are no strict requirements on the opening and closing speed of the valve, but some working conditions have special requirements for the opening and closing speed. If some require rapid opening or closing to prevent accidents, some require slow closing to prevent water hammer, etc. This should be considered when selecting the valve type.