Ball valve (ball valve), opening and closing parts (ball) driven by the stem, and around the ball valve axis for rotating movement of the valve.
1. Butterfly valve has small flow resistance when fully open. When opened between about 15° and 70°, sensitive flow control can be carried out, so in the field of large diameter regulation, butterfly valve application is very common. Because of the movement of butterfly valve plate with wipe, so most butterfly valves can be used with suspended solid particles of the medium. Depending on the strength of the seal, it can also be used in powder and granular media.
Butterfly valve is based on the rotating stem at the same time to drive disc rotation to do a valve. In the cylinder channel of butterfly valve body, the disc disc rotates around the axis, mainly rotating the disc 90° to do flow control, when the disc reaches 90° when the valve is in full open state.
After long-term use of the valve, the sealing surface of the disc and seat will wear and reduce the tightness. Repairing sealing surface is a large and important work.
Welding positioner is a universal, high efficiency to achieve circular welding welding equipment.