Pneumatic butterfly valve (English: butterfly valve) refers to a kind of valve whose closing part (disc or butterfly plate) is a disc, which rotates around the valve axis to open and close. It mainly plays the role of cutting off and throttling on the pipeline. The opening and closing part of butterfly valve is a disc shaped butterfly plate, which rotates around its own axis in the valve body to achieve the purpose of opening and closing or adjustment. The butterfly valve is generally less than 90 ° from full opening to full closing, and the butterfly valve and butterfly stem have no self-locking capacity. In order to position the butterfly plate, a worm gear reducer should be installed on the valve stem. The use of worm gear reducer can not only make the butterfly plate have self-locking ability, make the butterfly plate stop at any position, but also improve the operating performance of the valve. Special industrial butterfly valve is characterized by high temperature resistance, high applicable pressure range, large nominal diameter of valve, carbon steel valve body, and metal ring instead of rubber ring for sealing ring of valve plate. The large high-temperature butterfly valve is welded with steel plate and is mainly used for the flue and gas ducts of high-temperature media.

The large diameter compensator needs to be maintained regularly when it is used
The compensator is composed of two sets of bellows and structural parts, which is mainly used to absorb the axial displacement and cannot bear the pressure and thrust of bellows. When selecting the compensator, it is necessary to correctly calculate the pressure and thrust, and correctly set the fixed support and sliding support. The large diameter compensator is a new type of compensator. Compared with the traditional compensator, the large diameter compensator has larger rotating space, which increases the compensation amount. The large diameter compensator should pay attention to taking care of itself in the process of application, so as to better ensure its working performance.
1. After the operation of the large diameter compensator is completed, the crane tube must be pushed to one side of the oil delivery platform, and the crane tube lifting arm must be placed at 60 ° to make the balancer in a relaxed state.
2. Regularly stop the inspection of the crane tube and do a good job in maintenance; If any medium is found to be disclosed, it is necessary to disassemble the disclosed rotator to stop cleaning and maintenance and replace the seals.
3. Apply lubricating oil to the rotating part of each pin shaft and the spring balancer regularly.