Ball valve working principle and the reality of the role of works by love rotary valve to the valve flow or occlusion. Valve switch light, small size, can be made into large-caliber, reliable sealing, simple structure, easy maintenance, and spherical sealing surface often in the closed state, the media can not easily be eroded, in various sectors has been widely used. Ball and plug valves belong to the same type, only its closure member is a sphere, the sphere rotating around the center line valve to achieve open, and close a valve. Ball in the pipeline is mainly used for cutting, distribution and change the direction of flow of the medium. Ball is a new valve has been widely used in recent years, it has the following advantages: 1. Fluid resistance, its drag coefficient with the same pipe lengths are equal. 2. Simple structure, small size and light weight. 3. Compact and reliable valve sealing surface material widely used plastic, sealing, has also been widely used in the vacuum system. 4. Easy to operate, opening and closing rapidly, from fully open to fully closed as long as the rotation of 90 °, to facilitate remote control. 5. Easy maintenance, simple ball valve, seals are generally activities, the removal replacement is more convenient. 6. When fully open or fully closed, the sealing surface and the dielectric isolation ball and seat, through the media, will not cause erosion of the valve sealing surface. 7. Wide range of applications, from small diameter to a few millimeters to a few meters from high vacuum to high pressure can be applied. Ball has been widely used in various sectors of petroleum, chemical, power generation, paper, nuclear, aviation, rockets, as well as people's daily life. Ball form of the structure can be divided into: a floating ball valve The ball valve is floating in the medium under pressure, the ball can produce a certain displacement and pressed at the outlet end of the sealing surface to ensure sealing the outlet end. Simple floating ball valve structure, good sealing, but the ball all bear the load of the working medium to pass the exit ring, so to consider the ring material can withstand the work load of the media sphere. This structure is widely used in low-pressure valve. Second, the fixed ball valve ball valve is fixed, no movement after compression. All with a floating ball valve fixed valve seat, by medium pressure, the valve seat to move, so that the ball seals pressed on, in order to ensure the seal. Usually with the ball, the lower shaft with bearings, operating torque, suitable for high pressure and large diameter valves. To reduce the valve operating torque and increase the reliability of the seals, valve seals has emerged in recent years, both the pressure injection of a special lubricant between the sealing surface to form a layer of film that enhances the seal, but also reduce operating torque more suitable for large diameter high pressure valve. Third, the elastic ball valve The ball valve is elastic. Ball and seat ring are made of metal materials, sealing pressure than large, rely on the media itself has reached less pressure sealing requirements, must apply force. This valve is suitable for high temperature and high pressure medium. Elastic sphere is the sphere of the inner wall at the lower end of a resilient open slot, and access flexibility. When closing the channel, with the stem of the wedge-shaped head on and make the ball up the valve seat seal. Before turning the ball to loosen the wedge-shaped head, the ball along with restoration of the original prototype, so that small gap, sealing surface can reduce friction and operating torque between the ball and seat. Ball position can be divided according to their straight-channel, three-way and the right angle. After two ball valves for distribution media and change the flow of the medium. Ball Instructions 1. Scope: This specification applies to flanged end electric (or pneumatic) valve. 2. Composition: The composition of the ball valve in part by an electric (or pneumatic) actuator (20), which is connected by the bracket (18) and the connecting shaft (17). 3. Restrictions: temperature and pressure limits for a nameplate maximum ball at maximum and minimum allowable operating temperature operating pressure. b. Use PTFE or RTFE seat and seal materials, operating temperature should be between -290C to 2000C. Other types of seat and seal operating temperature, should be the subject of nuclear plant KI. c. the valve nominal pressure rating (PN), may indicate valve under normal temperature conditions the maximum working pressure. (For example: PN4.0, indicate its operating temperature at -290C ~ 380C when the maximum working pressure of 40 Bar (4.0MPa)). d. Note electric or pneumatic actuators, see the corresponding instructions. 4. Installation 1) Remove the protective cover on both sides of the flange end, rinse clean under the valve is fully open. 2), the signal should be required before the (electric or gas) installation testing machine (to prevent vibration from transport performance), after passing the on-line installation (wiring by electric actuator wiring diagram). 3), prepared with the front pipe connections shall be flushed and cleaned of impurities remaining in the pipeline (these substances may damage the seat and ball). 4) during the installation, please do not use the actuator portion of the valve lift lifting points as to avoid damage to the actuator and accessories. 5), this type valve should be installed in a horizontal or vertical direction of the pipe. 6), the installation of the pipeline near the external force should not be downcast or phenomenon, you can use the pipe brackets or supports to eliminate deviation from the pipeline. 7) After the pipe is connected, use the specified torque cross locking flange bolts. 5, operation and use one), before the operation is required to confirm piping and valves have been purged. 2), the valve operating according to the size of the input signal to drive the actuator stem rotation completed: Forward 1/4 turn (900), the valve is turned off. Rotate the 1/4 turn (900), the valve is open. 3) When the actuator direction arrow parallel with the pipeline, the valve is turned on; arrow indicates the vertical line, the valve is closed. 6, has a long service life and maintenance-free period, will depend on several factors: the normal working conditions, to maintain harmony temperature / pressure ratio, and reasonable corrosion data NOTES: ● valve in the closed position, the valve ● internal fluid pressure is still there before servicing and relieve line pressure valve in the open position ● Before servicing, disconnect the power or gas source ● Before maintenance, the actuator bracket from a), padding must be locked if l culvert at a micro filler vent, you must, and then lock the stem nut (13). l Be careful not to lock tight, usually to 1 1/4 turn and then lock ring leak will stop. 2), replace the seat and seals. A), the valve disassembly l in the half-open position, rinse, remove hazardous substances that may be present inside and outside the body. L Close the valve, removed bolts and nuts on both sides of the flange, The valve is then completely removed from the pipeline. l sequentially demolition drive - the actuator (20), connecting bracket (18) ,, lock washers (14), stem nut (13), butterfly shrapnel (12), Glam (11), wearable pieces (10), stem packing (9) l Removing body cover bolts (5) and nuts, isolated valve cover and valve body, and remove the valve cover gasket (16). l Make sure the ball (3) in the "off" position, which can be easier to come up from the body, then remove the valve seat. l by the body in the hole gently push down the stem (6) until it is completely removed, then remove the O-ring (8) and stem packing (7) Note: Please exercise caution to avoid scratches the surface of the valve stem and valve stuffing body sealing parts B), reassemble the parts removed for cleaning and inspection l strongly recommended spare parts package to replace its seat and valve cover gaskets and other seals l by reverse order of removal assembly. l with a predetermined torque, the cross-locking flange bolts (5). l with the specified torque, after locking stem nut (13) l installed actuator, enter the appropriate signal by rotating the rotary valve stem drive the valve to open and closed positions. l If possible, before returning to install pipes, according to the relevant standard for valve pressure seal testing and performance Address: Wenzhou Economic and Technological Development Zone in the center of Gaza City West 38 Street (million Grand Hotel opposite) Tel: 0577-86860004 Fax : 0577-85987575 Mobile: 18767710327 Jane Lin