Introduction to the development of high-performance butterfly valves

The high-performance butterfly valve is a valve that opens, closes and adjusts the fluid passage by reciprocating 90 degrees. The butterfly valve has simple structure, small size, light weight, low material consumption, small installation size, small driving torque, simple and fast operation, and has good flow decay function and closing and sealing characteristics. It is one of the valve varieties that have developed rapidly in recent years. Especially in developed countries such as Japan, Germany, France, and Italy, butterfly valves are widely used. The variety and quantity it uses are still expanding, and are developing towards high temperature, high pressure, large diameter, high sealing, long life, excellent adjustment characteristics and the integrated function of a valve. Its reliability and other performance indicators have reached a higher level, partially replacing the globe valve , gate valve and ball valve. With the advancement of butterfly valve technology, butterfly valves will become the dominant valve form.

The original butterfly valve is a simple flapper valve that does not close tightly. It is usually used as a flow regulating valve and a shock absorbing valve in a water pipe system.

With the application of chemical-resistant synthetic rubber in butterfly valves, the performance of butterfly valves has been improved. Synthetic rubber has the characteristics of corrosion resistance, corrosion resistance, dimensional stability, good elasticity, easy forming, and low cost. Synthetic rubber with different properties can be selected according to the requirements of use to meet the conditions of use of butterfly valves. It is widely used in the manufacture of butterfly valve linings and elastic valves. seat.

Since polytetrafluoroethylene (PTFE) has the advantages of strong corrosion resistance, stable performance, not easy to aging, low friction coefficient, easy forming, stable size, etc., it can also be filled and added with suitable materials to improve its comprehensive performance to obtain strength A better sealing material for butterfly valves with a lower friction coefficient overcomes the limitations of synthetic rubber. Therefore, polymer polymers represented by polytetrafluoroethylene and their filling and modified materials have been widely used in butterfly valves, thereby further improving the performance of butterfly valves, and there has been a wider temperature and pressure range, sealing performance and longer service life. Butterfly valve.

In order to meet the requirements of industrial applications such as high and low temperature, strong erosion, long life, etc., metal-sealed butterfly valves have made great progress in the past ten years. With the application of high temperature resistance, low temperature resistance, corrosion resistance, erosion resistance, and high strength alloy materials in butterfly valves, metal sealed butterfly valves have been widely used in high and low temperature, strong erosion, long life and other industries. Large diameter (9750mm ), high pressure (2.2kN/cm2), wide temperature range (-102~606℃) butterfly valve, its technology has reached a whole new level.

Due to the application of computer-aided design (CAD), computer-aided manufacturing (CAM) and flexible manufacturing system (FMS) in the valve industry , the design and manufacture of butterfly valves have reached a new level. It not only completely innovated the design and calculation methods of valve design, but also reduced the repetitive daily design work of professional and technical personnel, so that technicians have more energy to improve the technical performance of products and the research and development of new products, shorten the cycle and increase labor. productivity. Especially in the field of metal-sealed butterfly valves, due to the application of CAD/CAM, a three-dimensional sealing pair manufactured by CAD design and CAM numerical control processing has appeared, so that the valve is not squeezed, scratched or worn during the opening and closing process, thereby improving the sealing of the butterfly valve. Performance and service life.

When the butterfly valve is fully opened, it has a small flow resistance, and when it is opened about 15° to 70°, it can perform sensitive flow control. Therefore, in the field of large-diameter adjustment, the application of butterfly valves is very common and gradually becomes the dominant valve type.

Since the movement of the butterfly valve plate is wiping, most butterfly valves can be used for media with suspended solid particles, and can also be used for powder and granular media according to the sealing strength.