3.5 Seal seat structure with elastic element (l) The elastic element is the seal seat of butterfly spring, as shown in Figure 3. Fig. 3 Seal seat with butterfly spring (2) The elastic element is the seal seat of spring, as shown in Fig. 4. Fig. 4 Seal seat with cylindrical coil spring Fig. 3 and Fig. 4 Seal seat with butterfly spring or cylindrical coil spring has been widely used in non corrosive medium pneumatic ball valve. However, because it is difficult to select elastic element materials that can resist strong corrosive media and have good elasticity, and the heat treatment process of such materials is relatively complex, such seal seat structures are not widely used in pneumatic ball valves with strong corrosive media. (3) Combined lip seal seat Figure 5 Combined lip seal seat with elastic expansion ring Figure 5 shows the combined seal seat with elastic expansion ring and PTFE lip seal seat. The elastic expansion ring can be made of 1Cr18Ni9Ti or 1Cr18Ni9 to be compatible with strong corrosive media. Figure 6 shows the structure of elastic expansion ring; Figure 7 shows the structural form of PTFE lip seal seat. It can be seen from Figures 6 and 7 that the design angle of the lip of the polytetrafluoroethylene lip type seal seat is 30, while that of the elastic expansion ring is 34. Fig. 6 Structure of seal seat with elastic expansion ring structure Fig. 7 Structure of PTFE lip type seal seat Under the medium pressure, the elastic force of the elastic expansion ring can compensate for the shortcomings of insufficient elastic and plastic deformation capacity of the seal seat with a single PTFE material, which improves the reliability and service life of the seal of pneumatic ball valve. Under the condition of low medium pressure, due to the angle difference between the lip of the elastic expansion ring and the lip of the polytetrafluoroethylene lip seal seat, and the strong elastic-plastic deformation ability of the metal expansion ring, the polytetrafluoroethylene lip seal seat, under the effect of the elastic force of the elastic expansion ring, forms an outward tension tendency and compresses the ball to produce a pre compression force, which compensates for the insufficient sealing specific pressure caused by the reduction of the medium pressure. As long as it is within the elastic force range of the elastic expansion ring, it can ensure the reliable sealing of the pneumatic ball valve under lower pressure conditions.

The sleeve compensator is divided into one-way and two-way compensation structures. The two-way characteristic is that no matter where the medium flows from the compensator, the sliding sleeves at both ends of the compensator always slide freely to achieve two-way compensation and increase the compensation amount.
The varieties of sleeve compensators include elastic sleeve compensators, sleeve compound compensators, single sleeve compensators, and dual thermal sleeve compensators.
Sleeve compensator is applicable to medium engineering pressure ≤ 2.5MPa, medium temperature - 40 ℃~600 ℃.
The sleeve compensator adopts a new type of flexible graphite ring with sealing material, which has the characteristics of high strength, small friction coefficient (0.04~0.10), no aging, good effect, easy maintenance, etc.
The sleeve compensator has a long service life, and its fatigue life is equivalent to that of the pipeline. After special treatment, the sliding surface has good corrosion resistance in salt water, salt solution and other environments, more than 50 times higher than austenitic stainless steel. At the same time, if the sealing effect is weakened due to wear many years later, the flange can be tightened again to enhance the sealing performance. The compensator can also loosen the bolt, take off the pressure ring, and then install one or two layers of sealing ring to compress the pressure ring for further use. The sleeve compensator has no request for chloride ion content, and is especially suitable for systems with medium or surrounding environment chloride ion exceeding the standard.
The directly buried sleeve type compensator can be directly buried in the open, and the maintenance well can not be set when the device is installed, so the project cost is low. Xicun Water Supply and Drainage Data Factory has strong technical force, sophisticated equipment and advanced technology. We are always your best choice to buy elastic sleeve compensator. Sleeve compensator, also known as tubular expansion joint, is the compensation installation of hot fluid pipeline, which is mainly used as the auxiliary equipment of linear pipeline in China. The utility model belongs to a compensator which is directly installed in any pipeline for delivering non corrosive unidirectional or multidirectional fluid. The sleeve compensator can be divided into two types. One is our common ordinary type. The ordinary type sleeve compensator has been continuously used since the 1960s.
The ordinary sleeve compensator has a simple style, but with the development of society, many types have been changed, and the sleeve compensator is no exception. It is another kind of sleeve compensator today: two-way sleeve compensator. The two-way sleeve compensator has telescopic core tubes in both directions of the ordinary type of outer casing, and the compensation amount of the two-way compensator is twice that of the ordinary type, and it is used for two-way compensation, reducing the length size and cost of using two ordinary types. Therefore, the economical and convenient two-way compensator has been welcomed by the market once it is launched.