The structure is simple, the manufacture and the maintenance are more convenient.
The work schedule is small, the opening and closing time is short.
Good sealing, the sealing surface between the small friction, long life.
The disadvantages of bellows valves are as follows:
The fluid resistance is big, the power required to open and close is greater.
Not suitable for medium with particle size, large viscosity and easy coking.
Poor regulation performance.
Bellows valve type According to the position of stem thread is divided into external thread type, internal thread type. According to the direction of the media, there are straight-through, direct-current and angle-type. Cut-off valve in accordance with the form of sealing, there are filler bellows valve and bellows sealing valve.