The plug valve is a one-piece top-loading valve body design, which is comparable to one-piece top-loading ball valves. Compared with two-piece or three-piece ball valves, it is a completely different type and different application. 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. For the main applicability of the plug valve, there are the following application advantages:
1. 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.
2. The valve body is one-piece, top-mounted design, simple structure, convenient online maintenance, no valve body leakage point, and supports higher pipeline system strength.
3. 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 resistance to penetration 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.
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. Minimalist internal parts, the opening and closing parts, namely the cock, are completely covered by the bushing, the valve body and the cock are not worn, and the maintenance and update 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.
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 plug valve can add 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 patent owner's requirements, and it is difficult to use a ball valve as a customized valve.
Guangdong Jinshang Intelligent Electric Co., Ltd. has continuously reformed and innovated on the basis of fully introducing and absorbing foreign advanced technology, and has successfully developed and produced valve series products for the core system of gas appliances, which are widely used in outdoor ovens, heaters, wall-hung boilers, gas appliances, etc. at home and abroad. On many products such as ovens, the company has always implemented the IS09001 quality management system and strictly implemented the "7S" management standard.