1, bellows cut-off valve only allow one-way flow, installation is directional. Its structure length is larger than the gate valve, while the fluid resistance is large, long-term operation, sealing reliability is not strong.
2, bellows valve opening, the opening height of the valve, for the nominal diameter of the 25%~30%, the flow has reached the maximum, indicating that the valve has reached full open position. Therefore, the open position of the globe valve should be determined by the stroke of the disc.
3, bellows stop valve, also known as centerline, due to the opening and closing process between the sealing surface friction between small, relatively durable, open height is not easy to manufacture, maintenance convenience, not only suitable for medium and low pressure, but also suitable for high pressure. The principle of closure is that it relies on the pressure of the valve bar, so that the disc sealing surface and the seat sealing surface tightly fit to prevent the flow of media.
4, Handwheel, handle operation bellows stop valve can be installed in any position of the pipe, handwheel, handle and Wei-action mechanism, not allowed for lifting.
5, note that the flow of the medium should be the same as the direction of the arrow indicated by the valve body.