Pneumatic valve structure and working principle of the stationary _ pneumatic components factory valve industry

Pneumatic pneumatic valve fixed pneumatic valve is one of the pipeline pneumatic valve, suitable for high temperature and high pressure, large diameter pipeline. Its aerodynamic body around the center line of the body as a rotation to achieve a pneumatic valve opening and closing, can choose according to the requirements of worm gear fixed pneumatic valve, electric fixed pneumatic valve, pneumatic type pneumatic valve. Fixed pneumatic valve with floating seat, after the medium pressure, mobile seat, make the seal compression on the aerodynamic body, to ensure the seal. Usually in the upper and lower shaft with pneumatic body with bearings, operating torque is small, suitable for high pressure and large diameter of pneumatic valve. To reduce the number of pneumatic valve operating torque and increase the reliability of the sealing, appeared in recent years, oil seal, pneumatic valve, both betting special lubricant between the sealing surface, in order to form a layer of oil film, which increases the sealing, and reduce operating torque, suitable for high pressure large diameter pneumatic valve. Fixed pneumatic valve structure features: 1, the structure of the automatic pressure release: the abnormal rise of cavity pressure, single seal structure of fixed pneumatic valve has the function of automatic relief, pneumatic valve, double sealing structure of fixed by the additional pressure relief device on the valve body pressure relief. 2, sealing of emergency care: fixed pneumatic valve design with auxiliary emergency seating system, as shown in figure 1. Once soft seal is damaged, or unable to seal under the emergency, with the appropriate injection to the auxiliary seal system of sealant can be emergency seal. Emergency sealing device, when necessary, can also be used to flush the lubrication on the seat area, in order to keep it clean. Also the valve stem can also auxiliary emergency containment system is designed. Auxiliary seating ( FIG. 1) 3, locking devices, the worm gear fixed pneumatic valve in the full open and full closed position at two o 'clock on the structure of the design can be locked, such, can prevent wrong operation and unpredictable line of undue vibration switch phenomenon, especially in petroleum and chemical inflammable medium production line, as well as pneumatic valve when outdoor piping, the design reflects the advantages and the actual effect is very good. 4, fire prevention structure: according to the working condition and the needs of users, pneumatic valve can be designed for fire prevention structure. Fixed pneumatic valve of the refractory design and execution of API607 standards such as GB/T6899 rules, once a fire and make the soft seal when burning, fixed pneumatic valve can prevent leakage of medium of fire prevention structure, prevent fire further expanded. 5, anti-static structure: when operating fixed pneumatic valve, due to friction between aerodynamic body and seat, can produce electrostatic charge and accumulation on the aerodynamic body. In order to prevent electrostatic spark producing, on antistatic device, pneumatic valve will accumulate in the export (charge on aerodynamic body As shown in figure 2) 。 Stem fly out proof design/bonnet/stem antistatic device structure without leakage, FIG. 2) 6, full size structure and reducing structure: to meet the different needs of users, the fixed pneumatic valve produced by our company have a full size and reducing two series ( As shown in figure 3) 。 Full size channel diameter of pneumatic valve and pipe diameter, facilitate pipeline cleaning, while reducing the weight of the pneumatic valve is relatively light, but the fluid resistance is only about 1/7 of the same caliber cut-off valve, thus reducing the more extensive application prospect in the pneumatic valve. Form of reduced runoff (all-pass runoff Figure 3) 7, the body of the discharge device: according to user's requirement of system, fixed pneumatic valve discharge valve are installed on the body. Once the ends of the pneumatic valve is closed, the backlog of cavity can be through the body of the drain valve discharge, it has a double ended discharge ( DBB） Function. The body of the relief valve of another function is through it can long-term warp of body wash and emissions. : electric fixed pneumatic valve pneumatic type pneumatic valve