Ball valve classification 1), commonly used ball valve according to their working principle is divided into floating ball valve, fixed ball valve, lifting rod valve and so on. 2), the ball valve according to the channel position can be divided into straight-through, three-way and right-angle. The latter two ball valves are used to distribute the medium and change the flow of the medium. Ball valve construction, installation points 1), installation location, height, direction of import and export must meet the design requirements, the connection should be firm and tight. 2), installed in the insulation pipe on all types of manual valves, the handle shall not be down. 3), the appearance of the valve must be installed before the inspection, the valve nameplate should be consistent with the current national standard "General Valve Flags" GB12220 requirements. For the working pressure is greater than 1.0MPa and the main pipe to play the role of cut-off valve, the installation should be carried out before the intensity and tightness test, qualified after the standard use. Strength test, the test pressure of 1.5 times the nominal pressure, the duration of not less than 5min, valve housing, packing should be no leakage as qualified. Tightness test, the test pressure of 1.1 times the nominal pressure; test pressure in the test duration should be consistent with GB50243 standard requirements, the valve flap sealing surface without leakage as qualified. 4), valve flange and pipe flange according to the pipeline design requirements installed gaskets. 5), with the ball valve drive, according to the instructions of the product installation instructions. The use of the ball valve 1, before installing the valve to be sure to confirm the pipeline inside and body channel has been cleaned. 2, the operation of the ball valve driven by the actuator driven valve stem rotation complete opening and closing, forward rotation 1/4 turn (90 °), the ball valve is closed. The ball valve opens when rotated 1/4 turn (90 °) in the reverse direction. 3, when the implementing agency direction arrow parallel with the pipeline, the valve is open; the arrow and the pipeline perpendicular to the direction, the valve is closed. Ball valve to reduce the amount of maintenance methods: To make the hard seal ball valve has a longer service life and maintenance-free period, the valve must be in normal working conditions to maintain a harmonious temperature / pressure ratio, and in line with the valve body material corrosion data. Ball valve maintenance matters needing attention: the ball valve is closed, the pressure inside the valve body still exists pressure fluid. Before servicing the valve, internal pressure must be relieved and the valve must be open to disconnect the power or air supply and to disengage the actuator from the carriage. Then we can split the work in order to repair. Decomposition and reassembly must be careful to prevent damage to the sealing surface of parts, especially non-metallic parts, remove the O-ring should use special tools, reassemble the valve flange bolts must be symmetrical, gradually and evenly tighten, cleaning agent should And ball valve rubber parts, plastic parts, metal parts and working medium (such as gas) are compatible. Non-metallic parts Clean with pure water or alcohol Working medium for gas, gasoline (GB484-89) can be used to clean metal parts. Disassembled individual parts can be cleaned by dipping. Non-metallic parts that remain undistracted may be cleaned with a clean, fine, silk-dipped detergent cloth (to prevent the fibers from sticking to the parts). When cleaning, it must remove all grease, dirt, glue, dust and so on adhering to the wall surface. Non-metallic parts should be removed from the cleaning agent immediately after washing, and should not be soaked for a long time. After cleaning, the surface cleaning agent to be washed is volatilized (Available un-cleaned silk cloth wipe) for assembly, but should not be shelved for a long time, otherwise it will rust, dust pollution, the new parts also need to be cleaned before assembly, the use of grease lubrication. Grease should be ball valve metal materials, rubber parts, plastic parts and working medium are compatible. When the working medium is gas, for example, special 221 grease. A thin layer of grease is applied to the surface of the seal mounting groove, a thin layer of grease is applied to the rubber seal, a thin layer of grease is applied to the sealing surface and the friction surface of the valve stem, metal should not be allowed during assembly Debris, fibers, grease (except for the provisions of the use of) dust and other impurities, foreign bodies and other pollution, adhesion or stay on the surface of the parts or into the lumen. If there is a small amount of leakage occurred at the packing, should be locked stem nut. Note: Do not lock too tight, usually locked 1/4 turn ~ 1 circle, the leak will stop. Hard seal ball valve is suitable for low pressure, small diameter pipe to cut off the water flow and to change the distribution of water or need to quickly open and close the place. 3) small size, light weight; 4), the ball valve sealing surface material selection of plastic, good sealing; 5), easy to operate, open and close quickly, 7), fully open or fully closed, the sealing surface of the ball and the valve seat and the media isolation, the media will not be caused by the passage of time Valve sealing surface erosion
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