Stainless steel ball valve sealing structure in the form of a Lord, and the choice of sealing material impact valve sealing performance and use of performance, reliability factors. Now on the stainless steel ball valve mainly adopts the elastic ring four atmosphere and poly (ethylene lip seal structure form of the combination of seal seat. Stainless steel ball valves are widely used in all kinds of piping system quickly cut off the flow direction of medium, change and automatic control, can use manual, electric or pneumatic drive mode, etc. Stainless steel ball valve sealing structure is mainly composed of three parts, one is given priority to, deputy seal between the valve body, changed from sealing gasket; Second main body and the seal between the valve stem, by the 'V' shape packing or 0 seal ring, sealing structure of ball valve. Thirdly for the sphere and the main and deputy seal between the valve body, the seal seat, main sealing structure of ball valve. The main sealing structure of sealing affect the work performance of a ball valve, is key to design and manufacture of ball valve sealing structure. This article focuses on ball Industrial Valves main sealing of nonmetal sealing ( Also known as soft seal) Structural problems. 1 ball valve sealing requirements: nonmetal sealing ball valve sealing of national standard according to GB/T13927 'general Industrial Valves pressure test' a-class execution; 2 the influence factors for stainless steel ball valve sealing of the main sealing surface roughness and the parameter of the ball roundness; Main 3 ball valve sealing structure using elastic ring and rubber lining combination of ptfe lip seal valve seat seal, it can rely on metal materials elastic ring good elastic-plastic deformation ability, enhance the overall ability of elastic-plastic deformation and compensation, improve the sealing ability of ball valve; USES the seal seat with elastic element. The amount of precompression and adjustment no longer rely on the sealing gasket and implementation by elastic elements. With elastic element of the seal seat besides can obtain the necessary amount of pre compression, but also within the scope of the elastic deformation of elastic element for preloaded pressure compensation, stainless steel ball valve of the relatively long service life. In order to keep the stainless steel ball valve in the sealing medium pressure is lower, sphere and seal must be formed between certain preload pressure. In rigid seal seat, stainless steel ball valve working reliability and service life; Clip in the correct selection of sealing the amount of precompression. In order to keep the stainless steel ball valve in the sealing medium pressure is lower, sphere and seal must be formed between certain preload pressure. In rigid seal seat, stainless steel ball valve working reliability and service life; Clip in the correct selection of sealing the amount of precompression. Enough precompression, cannot guarantee low pressure sealing ball valves: large amount of compression, will result in friction torque between the sphere and the seal seat increases, the influence on the performance of the stainless steel ball valve action; And may cause the plastic deformation of seal seat, lead to seal failure. For ptfe seal seat, the preloaded pressure generally should be 0. 1 PN, and not less than 1. 02MPa。 The amount of precompression rigid seal seat adjustment by changing the sealing gasket thickness of implementation, seal adjustment gasket processing error will affect the effect of adjustment: reasonable assembly and adjustment is the key to obtain good sealing. In use, after the seal seat wear and tear, preloaded pressure automatic adjustment ability is very poor, so the service life of the structure of rigid seal seat ball valve is relatively short. Part of the solution is to use seal seat with elastic element. At this point, the amount of precompression and adjustment no longer rely on the sealing gasket and implementation by elastic elements. With elastic element of the seal seat besides can obtain the necessary amount of pre compression, but also within the scope of the elastic deformation of elastic element for preloaded pressure compensation, therefore, the service life of ball valve is relatively long. Solve the stainless steel ball valve sealing is the key to the structure of seal seat and seal material selection. According to the requirements of the different structure and use, the rational selection of structure form, the seal seat guarantee seal good processing manufaturability: choose the excellent performance, to adapt to the requirements of sealing material, meet the requirement of ball valve sealing, and improve the reliability and service life of ball valve work, is the key consideration of ball valve design improvements in the problem. Stainless steel ball valves in the process of manufacture, very easy to contact with other metal iron products. In order to make the stainless steel valves can never rust, that the easiest way is to do according to the following process. First: stainless steel ball valve blank after finished product, after pickling, must want to rinse, if there is a sand hole or perforation, should use the argon arc welding gas protection welding, and then polished, solid melt treatment again; The second: stainless steel ball valve products, processing after the completion of the test. Should use add rust powder to wash water. Third: stainless steel ball valves in the process of transportation as far as possible to pack the goods in wooden cases, not contact with metal products. Fourth: pipe after installation, on a regular basis to preventive maintenance and stainless steel ball valve, such as the stem out often with lubricating oil. Appropriate to open and close the valve several times. Make the ball, stem, sealing surface is not easy to assimilate.
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