Plastic float valve commissioning

Ball advantages: 1. Fluid resistance, ball full bore little flow resistance. 2. Simple structure, small size and light weight. 3. Compact and reliable. It has two sealing surface, and valve sealing surface material widely used in a variety of fluorine plastic, sealing, and can be completely sealed. In the vacuum system it has also been widely used. 4. Easy to operate, opening and closing rapidly, from fully open to fully closed as long as the rotation 90 °, to facilitate remote control. 5. Easy maintenance, simple ball valve, seals are generally activities, the removal replacement is more convenient. 6. In the fully open or fully closed, sealing surface and the dielectric isolation ball and seat, through the media, will not cause erosion of the valve sealing surface. 7. Since the ball valve opening and closing process wiping, so can be used for media with suspended solid particles. Ball classification and characteristics: 1, floating ball: ball valve is floating under medium pressure, the ball can produce a certain displacement and pressed on the sealing surface of the outlet end, ensure the outlet end seal. Floating ball valve simple 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 media sphere, by a high pressure shocks in , the ball may be shifted. This structure is generally used in low pressure valve. 2, the fixed ball: The ball valve is fixed, no pressure produces no movement. Fixed ball valve comes with a floating valve seat, by medium pressure, the valve seat to move, so that seals pressed onto the ball, 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 seal, 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 large diameter high pressure valve. 3, elastic ball valve (ie, track ball): The ball valve is elastic. Ball and valve seat rings are metal materials, sealing pressure than the large, rely on the pressure medium itself has reached less than the requirements of the seal, must apply force. This valve is suitable for high temperature and high pressure medium. Elastic sphere is the sphere in the lower end of the inner wall to open a resilient groove, and get flexible. When closing the channel, with the stem of the wedge-shaped head with the ball to open up the seat pressing to seal. Before turning the ball first release 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 valve seat. 4, V-ball: This ball belongs to the fixed ball, also single seat seal valve, regulating valve in the best performance, is equal percentage flow characteristic, adjustable ratio of 100: 1. With a shearing action between its V-notch and metal seat, especially for containing fibers, tiny solid particles, slurry and other media. 5, Tee Ball: ball valve with a T-type and L-type. T-pipes allows three orthogonal interconnected and cut third channel, from the division, a joining effect. L type can only connect two pipes mutually orthogonal, can not communicate with each other while maintaining the third pipeline, only play the role assigned. Parameters levels: 1, nominal pressure or pressure level: PN1.0-32.0MPa, ANSI CLASS 150-900, JIS10-20K; 2, nominal diameter or diameter: DN6 ~ 900, NPS 1/4 ~ 36; 3, connection : flanged, welded, threaded, socket weld; 4, suitable temperature: -196 ℃ ~ 540 ℃; 5, the driving modes: manual, worm gear, pneumatic, electric, hydraulic, gas-liquid interaction, electrical hydraulic linkage; 6, body material: WCB, ZG1Cr18Ni9Ti, ZG1Cr18Ni12Mo2Ti, CF8 (304), CF3 (304L), CF8M (316), CF3M (316L), Ti. Choice of different materials, can be separately applied to water, steam, oil, nitric acid, acetic acid, oxidizing medium, urea and other media. Valve installation: 1. Remove the flange end on both sides of the cover, at the valve is fully open state to wash clean. 2, with a signal mechanism valve should be required prior to installation (electric or gas) in the test machine (to prevent vibration from transport performance) performed after passing the line installation (wiring by electric actuator wiring diagram). 3. Preparation and front pipe connections, to be washed and cleaned of impurities remaining in the pipeline (these substances may cause damage to the seat and the ball core). 4. During the installation, please do not use the actuator portion of the valve as a crane lifting points to avoid damage to the actuator and accessories. 5, this type valve should be installed in horizontal or vertical pipes. 6, the installation of the pipeline near the falls or external force can not have the phenomenon, you can use duct work or support to eliminate the deviation from the pipeline. 7, and pipe connections, please use the specified torque cross locking flange bolts. Applications: As usual ball of rubber, nylon and Teflon as a valve seat ring material, so its use is limited by the temperature of the valve seat ring material. As of action against metal ball is in the role of the media sphere, between the plastic seat pressed against each other to complete (floating ball). Valve seat ring at a certain contact pressure, elastic-plastic deformation occurred in some areas. This deformation can compensate for manufacturing precision and surface roughness of the sphere, to ensure valve sealing performance. Also, because the valve seat ring is usually made of plastic, so the choice of structure and properties of ball, to consider the ball of fire and fire prevention, especially in the petroleum, chemical, metallurgy and other sectors, flammable, explosive media equipment and piping systems used in valve, should pay attention to fire and fire prevention. Typically, two-position adjustment, strict sealing performance, mud, wear, necking channel, opening and closing action quickly (1/4 turn open and close), high pressure off (large pressure), low noise, cavitation and gasification phenomenon, a small amount of leakage into the atmosphere, the operating torque, fluid resistance of the piping system, the recommended valve. Ball also suitable for light construction, low cutoff (pressure difference), corrosive medium pipeline system. At low temperature (cryogenic) equipment and piping systems can also be used ball. In the metallurgical industry, oxygen pipeline system, use the valves have been thoroughly degreased. When the pipeline and the gas pipeline in the main pipeline buried in the ground required, use a full-bore welded ball valve. When required to have adjusted performance, the need to use special valve configuration with a V-shaped opening. In the petroleum, petrochemical, chemical, power, urban construction, the working temperature of 200 degrees pipeline system can use metal-to-metal sealing ball. Common Faults and Solutions: Ball for a long time by the material erosion, friction, causing serious impact wear, can not meet the normal production, also causing a shortening of the equipment. Present for the ball wear more wear-resistant materials, such as ceramic materials, polymer composite materials, methods, applications have more beauty Wah technology system. Polymer material has excellent adhesion performance, superior abrasion resistance, safe solution to the drawbacks of metal often worn to ensure normal production equipment. And material unique ceramic material and special surface enhancer to the harshest environment of dry grinding abrasion and physical impact resistance properties superior to any steel or exceed tiles, products and coal incompatibility can be prevented ideal material for coal product. Have a long life and maintenance-free period: normal operating conditions, maintain a harmonious temperature / pressure ratio, and reasonable corrosion data NOTES: ● valve in the closed position, the internal body still exist before the pressurized fluid ● Maintenance, After releasing the line pressure and the valve in the open position ● Before maintenance, disconnect the power or gas source ● Before maintenance, the actuator bracket out ● You must identify the valve on the downstream pipeline indeed is dismounted pressure to perform disassemble Operation ● decomposition and care must be taken to prevent the sealing surface damage parts during reassembly, especially non-metallic parts, remove the appropriate use of special tools O-ring ● bolts on the flange must be symmetrical assembly, gradually and evenly tighten ● cleaning agent should be Ball of rubber parts, plastic parts, metal parts and the working medium (such as gas) are compatible. Working medium for the gas, available gasoline (GB484-89) to clean metal parts. Non-metallic parts exploded down with pure water or alcohol to clean the ● individual parts can be cleaned by immersion mode. Not yet left down decomposition of non-metallic parts may be clean metal parts are impregnated with fine clean silk cleaning agents (to prevent adhesion of fiber loss on the part) scrub. To be removed when cleaning the adhesive on the wall of all grease, dirt, rubber, dust, etc. ● cleaning agent should be removed from the non-metallic parts immediately after washing, not a long soak ● After cleaning the wall needed to be to be washed after volatile cleaning agent (can not dip cleaners silk rub) for assembly, but not for a long time on hold, otherwise it will rust, dust pollution ● new parts in the assembly also need clean water ● use grease lubrication. Grease should all be compatible with ball valve metal materials, rubber parts, plastic parts and the working medium. Working medium for the gas, it can be used such as 221 special grease. Spread a thin layer of grease on the surface of the seal mounting groove, spread a thin layer of grease on the rubber seals, sealing surface and the friction surface is coated with a thin layer of grease stem ● assembly should be allowed to have metal chips, fiber, fat (except for the requirement to use) dust and other impurities and foreign matter contamination, adhere to or remain on the part surface or into the cavity (1), padding was then locked If the packing leakage occurs at the micro shall be re-locking stem nut. Note: Do not lock tightly, and usually require a lock ring to 1 1/4 laps, the disclosure of which would be to stop. (2), the replacement of seats and seals (A), disassemble the valve in a half-open position, rinse, remove hazardous substances that may be present inside and outside the body. Close the valve, removed bolts and nuts on both sides of the flange, and then the valve is completely removed from the pipeline. Removing the drive sequentially - actuators, connecting bracket, lock washers, stem nut, butterfly shrapnel, Glam, wearable pieces, stem packing. Removing the body cover bolts and nuts, isolated valve cover and valve body, and remove the valve cover gasket. Confirm the valve ball in the "off" position, which can be relatively easily from the body out, and then removed the seat. Gently push the stem down until it is completely removed from the body in the hole, and then remove the lower O-ring and stem packing. Note: Proceed with caution, to avoid bruising the stem and body stuffing box sealing surface area. (B), reassemble the parts removed for cleaning and inspection, it is strongly recommended to use spare parts package to replace its valve seat and valve cover gaskets and other seals. Disassembly in reverse order of assembly. With the specified torque, cross-locking flange bolts. With the specified torque, locking stem nut. After installing the actuator, the input signal corresponding to the rotating drive spool by rotating the valve stem, the valve to open and closed positions. If possible, before returning to loading pipes, according to the relevant standard valve pressure seal testing and performance testing