Most of the valves in the pipeline network system are mainly used to cut off and regulate the medium. These valves account for a large proportion and have a high usage in the entire system, requiring them to be durable and cost-effective. At the same time, they should be able to regulate and load cut off the medium in the forward flow direction, and prevent the medium from flowing back during pressure difference changes or maintenance, that is, they should have a bidirectional cutting function. Recently, these valves are mainly used in pipeline systems, including globe valves, gate valves, butterfly valves, and ball valves. Globe valves and gate valves have good bidirectional shut-off function, good sealing performance and service life, both of which are one of the pioneers of valves. However, globe valves are inherently limited by the structure of the globe valve, and their large appearance and large operating torque make gate valves have no regulating function. There is a significant risk of gate detachment when used to regulate flow. Large diameter gate valves, with their large appearance and height, are also difficult to manufacture and transport. Compared with gate valves, butterfly valves have the characteristics of shorter opening and closing time, smaller operating torque, smaller installation space, and lighter weight. Some division of labor uses metal bidirectional butterfly valves instead of gate valves. However, the sealing performance of butterfly valves has not fully met market requirements. Except for the midline lined rubber butterfly valve, which can seal in both directions within a certain pressure range, other structures are basically unidirectional flow. The midline structure is limited by rubber and cannot be popularized. After improvement, bidirectional butterfly valves with stainless steel elastic sheet structures have appeared on the market, but their prices are high. At present, it is mainly used in pipelines with important media such as oil, natural gas, and coal gas, and is less commonly used in general pipeline networks, especially in water systems.

The main advantages of the hard hitting bi-directional pressure butterfly valve are:
1.Not only can it reliably shut off in forward pressure,but it can also reliably shut off in reverse pressure or when the reverse pressure is much greater than the forward pressure;
2.Advanced processes such as space plasma spraying,ether laser sputtering,and vacuum protection overlay welding can be used to form gradient functional materials such as martensitic stainless steel,austenitic stainless steel,hard alloys,metal ceramics,and synthetic diamonds on the two sealing surfaces of the sealing pair according to different hardness requirements;
3.Can automatically align the center(adaptive)and automatically compensate for wear beyond the range;
4.Fully utilize the energy of the medium inside the valve when closing,automatically apply high sealing pressure to achieve reliable zero leakage of the high hardness sealing pair;
5.Instantly close and instantly open,there is no friction between the sealing pairs.When opened,the projected cross-section of the valve core continuously shrinks inward and retracts,and when initially opened,the retraction is faster than the inward contraction.When closed,the projected cross-section of the valve core continuously expands and advances.At the beginning of closure,the expansion rate is greater than the forward rate,and at the end of closure,the forward rate is greater than the expansion rate.Characterized by eccentric hemispherical valve,globe valve,and wedge gate valve;
6.Its main structure is similar to a butterfly valve,with the characteristics of short structure and small volume of a butterfly valve,so it can manufacture large caliber,extra large caliber,and extra large caliber valves;
This valve combines the functions and advantages of butterfly valve,half globe valve,gate valve,and globe valve,while also having its own unique and powerful features and advantages.A series of advantages such as small size,light weight,convenient transportation,installation,maintenance and repair,and reliable operation have become a major technological revolution in the valve industry.