Two-way flow hard-sealing rotary ball valve

Bi-directional Flow Hard-seated Trunnion Ball Valve

      Most valves in pipeline systems are mainly used for medium cutoff and regulation. These valves account for a large proportion of the entire system, are used in large quantities, and require long service life and high cost-effectiveness. Meanwhile, they should be able to regulate and cutoff when the medium flows forward, and prevent medium backflow during pressure difference changes or maintenance, i.e., they have a bi-directional cutoff function.

    Currently, the main types of valves used in pipeline systems include gate valves, globe valves, butterfly valves, and ball valves. Globe valves and gate valves have good bi-directional cutoff functions, as well as good sealing performance and service life, and are among the earliest valve types. However, globe valves are limited by their inherent structure, with large appearance and high operating torque, making it impossible to produce large-diameter ones; currently, only DN400 is available in the market.

Gate valves, on the other hand, have no regulation function, and there is a significant risk of gate plate falling off when used for flow regulation. Large-diameter gate valves also face great difficulties in manufacturing and transportation due to their huge size and height.

      Compared with gate valves, butterfly valves have the characteristics of short opening and closing time, small operating torque, small installation space, and light weight, so some working conditions use butterfly valves instead of gate valves. However, the sealing performance of butterfly valves has not fully met market requirements. Except for the midline rubber-lined butterfly valves that can achieve bi-directional sealing within a certain pressure range, other structures are basically unidirectional flow. The midline structure cannot be popularized due to rubber limitations. After improvement, bi-directional butterfly valves with stainless steel structures have appeared in the market, but they are expensive and have limited service life, so they have not been widely used. Ball valves are recognized by the market for their advantages such as small flow resistance and long service life, but they are expensive. Currently, they are mainly used in important pipelines for media such as oil, natural gas, and coal gas, and are rarely used in general pipeline networks, especially water systems.

      In general pipeline systems where a large number of valves are used, is there a valve that has superior performance, moderate price, can achieve bi-directional sealing, and is not limited by diameter?

The answer is yes. The bi-directional flow hard-seated trunnion ball valve developed based on years of design experience is developed by combining the superior sealing performance of ball valves and the advantageous structural performance of butterfly valves. It not only has the practical advantages of bi-directional sealing, adjustability, and long service life of ball valves, but also has the advantages of small size and light weight of butterfly valves. It is essentially an eccentric hemispherical valve with a butterfly structure! Its sealing principle combines the front-end sealing of fixed ball valves and the forced sealing of eccentric butterfly valves, thus realizing bi-directional cutoff under high and low pressure. On the two sealing surfaces of the sealing pair, advanced processes such as space plasma spraying, ether laser sputtering, and vacuum-protected composite surfacing can be used to form gradient functional materials such as martensitic stainless steel, austenitic stainless steel, cemented carbide, cermet, and artificial diamond according to different hardness requirements. It can automatically align the center (self-adapt), automatically compensate for wear beyond the stroke, and automatically apply an extremely high sealing specific pressure. The sealing pair has no friction when opening and closing instantly. When opening, the core projection continuously shrinks inward and retreats; when closing, the core projection continuously expands and advances. With its short structure, small size, ability to manufacture large-diameter, extra-large-diameter, and super-large-diameter valves, convenient transportation, installation, maintenance, and reliable operation, it has become a major technological revolution in the valve industry.

With its superior cost-effectiveness, this valve will definitely bring about a revolution in pipeline valves, making it a reality for ordinary pipeline networks, especially water system pipeline networks, to enjoy high-performance, high-quality products equivalent to those used in high-end systems such as thermal power and gas at mid-to-low prices!

Main Applications

Where valves are required at pump outlets, pipeline systems, water recovery systems, high-level water tanks, waterlogging-prone sewage systems, and backflow prevention systems, this valve is widely used for pipeline opening, closing, and regulation in industries and sectors such as metallurgy, mining, petrochemicals, chemicals, electric power, environmental protection, and municipal engineering.