Pneumatic unloading ball valve only need to use air rotation 90 degrees of operation and a small turning moment can be closed tight. The completely equal body cavity provides a medium-sized, straight-through runner with low resistance. Ball valves are generally considered to be the most suitable for direct opening and closing, but recent developments have designed the ball valve to be throttling and controlling flow. The main features of the ball valve is its compact structure, easy operation and maintenance, suitable for general working media such as water, solvents, acids and natural gas, but also for media with bad working conditions such as oxygen, hydrogen peroxide, methane and ethylene. Ball valve body can be a whole, it can be combined. Pneumatic unloading ball valve works by rotating the spool to make the valve clear or blocked. Pneumatic ball valve switch is light, small size, can be made into a large diameter, reliable sealing, simple structure, easy maintenance, sealing surface and the spherical often closed state, easy to be media erosion, widely used in various industries. Pneumatic unloading ball valve and plug valve are the same type of valve, and only its closure is a sphere, the sphere around the centerline of the valve body to rotate to achieve the open, close a valve. Pneumatic unloading ball valve in the pipeline is mainly used to cut off fast, distribution and change the flow direction of the media. Pneumatic ball valve is widely used in recent years, a new type of valve, which has the following advantages: 1. Fluid resistance is small, the resistance coefficient and the same length of the pipe section. 2. Simple structure, small size, light weight. 3. Tight and reliable, the current ball valve sealing surface material widely used carbon fiber, ppl, good sealing performance, the vacuum system has also been widely used. 4. Easy to operate, quick opening and closing, as long as 90 ° rotation from full open to full close, easy to remote control. 5. Easy maintenance, pneumatic valve structure is simple, the seals are generally active, demolition and replacement are more convenient. 6. In the fully open or fully closed, the ball and valve seat sealing surface and media isolation, the media will not cause erosion of the valve sealing surface. 7. Wide range of applications, the path from small to a few millimeters, up to a few meters, from high vacuum to high pressure can be applied. Pneumatic unloading ball valve has been widely used in petroleum, chemical, power generation, papermaking, atomic energy, aviation, rockets and other departments, as well as people's daily lives. Pneumatic unloading gray ball valve structure First, the floating pneumatic unloading ball valve Pneumatic unloading gray ball valve is floating, under medium pressure, the ball can produce a certain displacement and squeeze the sealing surface at the outlet end to ensure that the outlet seal. Pneumatic unloading ball valve ball valve structure is simple, good sealing, but the ball to withstand the load of the working medium all the export seal, so to consider whether the seal ring material can withstand the working load of the ball medium. This structure is widely used in low pressure ball valve. Second, the fixed pneumatic unloading ball valve pneumatic unloading ball valve ball is fixed, does not produce movement after compression. Fixed ball valve with a floating valve seat, subject to media pressure, the valve seat to move so that the ring is pressed on the ball in order to ensure the seal. Usually with the ball on the lower shaft equipped with bearings, operating torque is small, suitable for high pressure and large diameter of the valve. In order to reduce the operating torque of the pneumatic ball valve and increase the reliability of the seal, oil seal ball valves have emerged in recent years. The special lubricant is injected between the seal faces to form an oil film, thus enhancing the sealing performance and reducing the operation Torque, more suitable for high pressure large diameter ball valve. Pneumatic unloading ball valve manual 1, the scope: This manual applies to the flange of the electric (or pneumatic) ball valve. 2, composed of: electric (or pneumatic) actuator (20) and the ball valve body part, which is connected by the bracket (18) and the connecting shaft (17). 3, the use of restrictions on temperature and pressure limit The nameplate shows the ball valve in the maximum and minimum operating temperature allowed maximum operating pressure. l Use ptfe or rtfe valve seat and seal, the operating temperature should be between -290c to 2000c. Other types of valve seat and seal operating temperature, should be ki factory inspection. l Nominal pressure rating (pn) of the valve indicates the maximum working pressure of the valve at normal temperature. (Eg pn4.0, indicating a maximum working pressure of 40 bar (4.0 mpa) at an operating temperature of -290 to 380 ° C). l For the precautions of the electric or pneumatic actuator, refer to the corresponding instruction manual. 4, the installation 1), remove the flange on both sides of the protective cover, the valve is fully open the state for flushing and cleaning. 2) Installation should be carried out according to the required signal (electrical or gas) machine test (to prevent the use of vibration due to transport performance), qualified before going on-line installation (wiring according to the electric actuator circuit). 3) Flush and remove residual contaminants from clean pipelines (these may cause damage to the seat and ball) before connecting to the pipe. 4) During the installation, please do not use the actuator part of the valve as lifting lifting point to avoid damaging the actuator and accessories. 5) This type of valve should be installed in the pipe horizontal or vertical direction. 6) The pipe near the installation point can not be lowered or subjected to external force. Pipe supports or supports can be used to eliminate the pipeline deviation. 7) After connecting with the pipe, cross-fasten the flange connecting bolt with the specified torque. 4, operation and use 1), before operation to confirm the pipeline and valve have been washed over. 2), the valve operation according to the size of the actuator input signal to promote stem rotation is completed: forward rotation 1/4 turn (900), the valve is turned off. The valve opens when rotated 1/4 turn (900) in the reverse direction. 3) The valve is open when the direction arrow of the implementing agency is parallel to the pipeline; the valve is closed when the indicating arrow is perpendicular to the pipeline. 5, maintenance has a longer service life and maintenance-free period, will depend on the following factors: normal working conditions, to maintain a harmonious temperature / pressure ratio, and reasonable corrosion data Note: the ball valve is closed, the valve body There is still pressure fluid maintenance before lifting the pipeline pressure and the valve is in the open position before maintenance, disconnect the power or gas source maintenance, the actuator and the stent off
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