Ball Valve deputy editor valve seal (ie seat sealing surface and the ball sealing surface) material pairing for the ball metal metal. Formal structure into a floating ball valve and fixed ball, in the form of flanged connections, welded connections and threaded connections. Chinese name seal valve attribute classification unidirectional valve seals, bi-directional sealing maximum hardness HRC72 works Contents 1 Classification 2 3 4 maintenance operation uses a taxonomy editor Overview Description Note 1) unidirectional Seal:?? Only in the specified direction that the ball valve seal sealing direction indicated. 2) bi-directional sealing: sealing in both directions. Two works edited seal valve, manual steel seal valve body surface using advanced spraying technology, through a variety of different conditions of treatment, the maximum hardness of up to HRC78. Processing seat sealing surface, the maximum hardness up HRC72. Paired grinding ball and seat, all sealed ball across the sealing surface area are precision ground. Suitable for high temperature and pressure of water, steam, oil, coal, fiber, thick and corrosive media, and media with particles. Metal sealing ball floating ball and fixed ball two structural metal sphere in contact with the seat ring, by acting on the seat ring spring load evenly so that the seat ring and the spherical form a seal. Due to the action of the spring load of the auxiliary seal swell, a seal between the valve body and the valve seat spring load sufficient to provide a reliable seal between the valve seat and ball, under low pressure conditions, can be designed between the valve seat sealing surface and the ball There sealant injection system. 3, use the Edit 1) is required to confirm the operation before piping and valves have been purged. 2) operation of the valve actuator input signal according to the size of the drive stem rotation is completed: the forward 1/4 turn (90 °), the valve is turned off. Counter-rotating 1/4 turn (90 °), the valve opens. 3) When the actuator direction arrow parallel with the pipeline, the valve is turned on; arrow indicates the vertical line, the valve is closed. 4 Maintenance Editing Overview Description have a longer 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. Note ● valve in the closed position, the valve is still there inside the pressurized fluid ● Before maintenance, lift line pressure and the valve in the open position ● Before servicing, disconnect the power or gas source ● Before maintenance, the actuator and bracket out ● You must identify the ball, after removing the pressure downstream pipeline has indeed to be demolished decomposition operation ● decomposition and care must be taken to prevent further damage to the sealing surface of the assembly of parts, especially the non-metallic parts, O-rings should be taken when using a dedicated tool ● When mounting bolts on the flange must be symmetrical, gradually and evenly tighten ● cleaning agent should be compatible with the ball in the rubber parts, plastic parts, metal parts and the working medium (such as gas) and others. Working medium for the gas, available gasoline (GB484-89) to clean metal parts. Non-metallic parts decomposition down with pure water or alcohol to clean ● individual parts can be cleaned with immersion mode. Not yet left down decomposition of non-metallic parts of the metal parts can be impregnated with fine clean clean cleaning agent has silk (in order to avoid loss of fiber adhesion on the part) scrub. Must be removed for cleaning all the adhesive on the wall of grease, dirt, rubber, dust, etc. ● cleaning agent should be removed from the non-metallic parts immediately after washing, not long soak ● After cleaning the wall needed to be to be washed after volatile cleaning agent (not soaked cleaning agent available silk rub) for assembly, but not for a long time on hold, otherwise it will rust, dust pollution ● new parts before assembly also need clean ● use grease lubrication. Grease should be compatible with the ball are metal, rubber parts, plastic parts and the working medium. Working medium for the gas, can be used such as 221 special grease. Apply a thin layer of grease on the surface of the seal mounting groove, coated with 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 a metal chips, fiber, fat (except the requirement to use) dust and other impurities, foreign matter contamination, adhesion or remain in or on the surface of the part into the cavity filler was then locked at the micro vent if padding occurs, must be locked tight stem nut. Note: Do not lock tight, and then usually lock ring to 1 1/4 laps, leak will stop. Replace the seat 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 and disconnect the connecting bolts and nuts on both sides of the flange, and then the valve is completely removed from the pipeline. Sequentially demolition drive - actuators, connecting bracket, lock washers, stem nut, butterfly shrapnel, Glam, wearable pieces, stem packing. Removing body cover bolts and nuts, valve cover separated from the body, and remove the valve cover gasket. Confirm the valve ball in the "off" position, it can be easier to take out from the valve body, and then removed the valve seat. Gently push down the stem 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 scratches the surface of the stem and the valve sealing parts stuffing. B), reassemble the parts removed for cleaning and inspection, it is strongly recommended to use spare parts package to replace its seat and valve cover gaskets and other seals. In reverse order of disassembly assembled. A predetermined torque, the cross-locking flange connecting bolts. With the specified torque, locking stem nut. After installing the actuator, the input signal corresponding to the rotating spool driven by rotating the stem, the valve to open and closed positions. If possible, before returning to install pipes, according to the relevant standard for valve pressure seal testing and performance testing. 1, the principle of opening and closing parts ball is a sphere, the sphere rotating around the center line valve to achieve open, and close a valve. 2, for the low-pressure places, small diameter pipes for water and cut off or need to change the allocation of places open and close rapidly with water. 3. Features 1), flow resistance is small; 2) simple structure; 3), small size, light weight; 4), valve sealing surface material use plastic, sealing well; 5), easy to operate, opening and closing rapidly , to facilitate remote control; 6), easy maintenance, seals are generally activities, the removal easy to replace; 7), fully open or fully closed, the ball and seat sealing surface and the dielectric isolation, not through the media cause erosion of the valve sealing surface.