Six protective measures for hard seal butterfly valves

Hard-sealed butterfly valve, also called flap valve, is a regulating valve with a simple structure and can also be used for on-off control of low-pressure pipeline media. The hard seal butterfly valve mainly cuts off and throttles on the pipeline. The butterfly valve opening and closing part 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. Hard-sealed butterfly valves are suitable for conveying various corrosive and non-corrosive fluid media in the pipelines of generators, gas, steam, natural gas, city gas, cold and hot air, chemical smelting projects and power generation environmental protection systems, and are used to regulate and cut off the media. Of the flow. Hard seal butterfly valves can be divided into manual hard seal butterfly valves, pneumatic hard seal butterfly valves, and electric hard seal butterfly valves.
Six protective measures for hard seal butterfly valves
1. The bolts welded on the valve disc should not be too long. Otherwise, the bolts will be too long and will resist the flow passage in the valve body, causing the sealing surface to be "overheaded" and unable to play a sealing role; pay attention to checking and adjusting the screw opening during assembly. Ensure that the sealing surface can be tightly joined.

2. Choose a suitable adjusting pad. The thickness of the pad should be slightly lower than or equal to the step height of the valve disc sealing surface, so that the soft gasket and the valve disc sealing surface are in close contact and are in the same plane.

3. In order to prevent the compression nut from falling off, proper anti-loosening treatment should be done after the nut is tightened.

4. The use conditions of the fluid medium should be considered, and a soft gasket suitable for the requirements of the medium should be selected to avoid the influence of medium corrosion or high temperature deformation.

5. When the sealing surface of the valve seat is seriously damaged, the valve seat can be scrapped, and the valve core can still be used with the valve seat of the same specification after being improved.

6. Make a mark when adjusting the valve to avoid violent opening and closing, so as not to affect the service life of the gasket.