The plug valve is a one-piece top-loading valve body design, which is comparable to one-piece top-loading ball valve
s. Compared with two-piece or three-piece ball valves, it is a completely different type and different application. For the main applicability of the plug valve, there are the following application advantages: 1. The valve body is one-piece, top-mounted design, simple structure, convenient online maintenance, no valve body leakage, and supports higher pipeline system strength. 2. The medium in the chemical process is highly corrosive. In the chemical field, it is often seen that the valve body is corroded by the medium. Therefore, the valve body used in the chemical process must have strong permeability and resistance. Intergranular corrosion, the valve body of the plug valve is a high-grade casting, the casting quality is grade II, and the precision is grade V. 3. Minimalist internal parts, the opening and closing parts, that is, the cock, are completely covered by the bushing, the valve body and the cock are not worn, and the maintenance and renewal of the valve can be completed by simply and economical replacement of the bushing and the top seal, which can reach a temperature of 300 °C. Long-term use requirements have considerable competitive advantages compared with metal hard-sealed ball valves that belong to this application range. 4. The entire processing surface of the plug valve is only the top surface and the flange. All other components are cast at one time. There is no processing inside the valve body. Compared with the ball valve, it has the advantage of low machining allowance. When the material is INCONEL, MONEL, Hastelloy When using special materials such as alloys, it has obvious price advantages. 5. The plug valve can be added with various designs to achieve specific functions according to the needs of users. The plug valve is the leader in the customized valve products. The plug valve is easy to realize the special customization of the customer's process. Etc., for example, the six-way distribution valve used in the polyester industry is a plug valve customized according to the requirements of the patentee, and it is difficult to use a ball valve as a customized valve. 6. No gap and face seal are still the unique characteristics of plug valves. Although there is a design of a gapless ball valve, the design of a ball valve that reduces the gap between the valve ball and the valve body to 1~3 mm as much as possible cannot achieve The application advantage of the enveloping face seal, this feature of the plug valve, makes the plug valve suitable for handling many harsh media, such as fluids that are prone to crystallizing, viscous, containing catalyst particles and deposit corrosion. 7. The cladding bushing provides face sealing characteristics, which can be strictly controlled to meet the 'zero leakage' test requirements of API 598 soft-sealed valve seats, and can meet the valve stem sealing requirements of TA-Luft or ISO 15848. The comprehensive characteristics of the plug valve are that it has a relatively long service life and high reliability. It is a good choice for many corrosive, abrasive, highly toxic, continuous operation and other media and devices. It has application advantages and a wide range of applications in the chemical industry. applicability. The disadvantages of the plug valve are as follows: 1. The face seal design increases the requirements for the driving torque. When a pneumatic actuator is required, compared with the ball valve, the larger actuator and accessories are required, which will increase the user's cost of use. For example, in the PP process, the main cut-off valve uses a plug valve instead of a ball valve, but the high-frequency switching valve uses a ball valve, so basically pneumatic plug valves are used in key cut-off positions. Plug valves are not completely recommended for regulating applications. High frequency switching is not the advantage of plug valves. It is a highly reliable shut-off valve. 2. In some applications, the incorrect selection of the bushing material or the improper design of the valve body for the bushing deformation release area will cause the PTFE material bushing to swell, resulting in several times of change in the driving torque required by the valve. This situation is basically avoided with the correct and targeted consideration of the material. 3. The one-time investment of the plug valve is higher than that of the ball valve, but as the reliability of the plug valve, the total cost of the life cycle and other advantages are gradually accepted by domestic users, more and more users will continue to use the original process design requirements. the plug valve, and gradually reduce the decision to change it to a ball valve.
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