Butterfly valve is a kind of regulating valve with simple structure. The butterfly valve which can be used to control the opening and closing of low-pressure pipeline medium is a kind of valve with the closing member (valve clack or butterfly plate) of a disc, which achieves opening and closing by rotating around the valve shaft.
The gate valve is an opening and closing part of the gate. The movement direction of the gate is vertical to the flow direction. The gate valve can only be fully opened and closed, and cannot be used for regulating and throttling.
Ball valve, a kind of valve whose opening and closing part (ball) is driven by valve rod and rotates along axis of the ball valve. It can also be used for the regulation and control of fluid. Among which, for the hard-sealing V-type ball valve, there is strong shear force between the V-shaped ball core and metal seat surfaced with hard alloy. It is especially suitable for media containing fiber and micro solid particles.
Check valve is a kind of valve whose opening and closing part is round valve clack and whose action is produced by its own weight and medium pressure to block medium backflow. It is a kind of automatic valve, and is also called as cut-off valve, one-way valve, return valve or isolating valve.
TThe effective expansion deformation of the working body bellows is used to absorb the dimension change caused by thermal expansion and cold contraction of pipelines, conduits and containers, or to compensate the axial, horizontal and angular displacement of pipelines, conduits and containers. It can also be used for noise and vibration reduction.
