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 can be divided according to its channel position through-type, three-way and right angle. The latter two ball valves are used to distribute the medium and change the flow of the medium. Construction, installation points (1), installation location, height, direction of import and export must meet the design requirements, the connection should be strong and tight. (2), all kinds of manual valves installed on the pipe insulation, the handle shall not be down. (3) The appearance inspection must be carried out before installation. The nameplate of the valve shall comply with the provisions of the current national standard "General Valve Marking" GB 12220. For the working pressure is greater than 1.0 MPa 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 is 1.1 times the nominal pressure; test pressure in the test duration should be consistent with GB 50243 standard requirements, no leakage valve plate sealing as qualified. (4), the valve flange and pipeline flange according to the pipeline design requirements installed gaskets. (5), ball valve with transmission mechanism, according to the instructions of the product installation instructions. Standard 1), product standard "common valve flange and butt welded steel ball valve" GB / T12237-89 "iron and copper ball valve" GB / T "General requirements for steel valves" GB / T 12224 -2005 "drinking water distribution equipment and protective materials safety evaluation criteria" GB / T 2), engineering standards "building water supply and drainage engineering and construction quality acceptance norms" GB "ventilation and air conditioning Acceptance of construction quality standards "GB 50243-20 Use 1, before installing the valve to be sure to confirm the internal pipe and body passage has been cleaned. 2, Shanghai Gui Long Ball Valve Actuator driven by the implementation of the valve stem rotation to complete the opening and closing, forward rotation 1/4 (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. 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 conditions to maintain a harmonious temperature / pressure ratio, and in line with the valve body material corrosion data. Maintenance considerations: the ball valve is closed, there is still pressure within the body of the pressure generated by the 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 bracket. Then we can split the work in order to repair. Disassembly and reassembly must be careful to prevent damage to the sealing surface of parts, especially non-metallic parts, remove the O-ring should use a special tool to reassemble the valve flange bolts must be symmetrical, step by step, evenly tighten the cleaning agent should be ball valve In the 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 cleaning cloth (to prevent the fibers from sticking to the parts). Clean all non-metallic parts such as grease, dirt, glue, dust and other non-metal parts adhered to the wall after cleaning, remove it from the cleaning agent immediately, do not immerse it for a long time after cleaning, and then need to be washed. After the surface cleaning agent is volatilized Unwash detergent silk cloth) assembly, but should not be shelved for a long time, otherwise it will rust, dust pollution New parts also need to be cleaned prior to assembly Use 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. Apply a thin layer of grease on the surface of the seal mounting groove and a thin layer of grease on the rubber seal. Apply a thin layer of grease to the sealing surface and the friction surface of the valve stem. Debris, fibers, grease (other than those specified) dust and other impurities, foreign matter 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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