Ball valve, the standard of GB/T21465 - 2008 'valve terms' are defined as opening and closing ( A sphere) Driven by the valve stem, and around the axis of rotation movement of the valve stem. Mainly used for truncated or on line in the medium, can also be used for regulation and control of the fluid, including hard seal v-shaped ball valve the v-shaped ball core of carbide surfacing with strong shear force between metal Industrial Valves seat, especially suitable for fiber, micro solid material such as medium. And ball valve in the pipeline is not only more connected to the confluence of flexible control medium, shunt, and the flow switch, at the same time also can close any channel and make the other two. This valve shall generally be installed in the pipeline. Classification of ball valve, pneumatic ball valves, electric ball valves, manual ball valve. For quick open, ball valve is not a good choice, general electric ball valve opening and closing time control in the 7 - — 50 s, are generally more than 30 seconds, this is relatively slow. Currently our ball valve is fully open 45 s, a total of 90 °, is one second, twice the control flow is very accurate, only regret is likely to be only provide full open and close signal two points of feedback! ! The ball valve model generally each manufacturer has its own set of table model, but also has a standard model for reference. Always fine all standing valve ball valve model: 1. Ball valve, ball valve name models: Q is uniform; 2. Ball valve attached models: V cryogenic valve core with a v-shaped structure, D, B said heat preservation, P said eccentric structure, U and SDY jacket type; 3. Ball valve drive models: two electro - hydraulic turbine, 3 said, 6 said said pneumatic, hydraulic, 9 electric, manual without model; 4. Connection type: 1 female, 4 said flange, 6 said welding, 7 said the wafer; 5. Structure type: ( 1) Floating type: 1 for straight-through flow to said, 2 Y type tee, 4 L tee, 5 T T; ( 2) Fixed: 0 means hemisphere pass-through, 6 said cross flow, 7 said direct flow to 9, 8 said L tee, said Y type tee; 6. Sealing material type: B babbitt, fluorine rubber, F46 fluorine-butterfly F, H rust steel, rubber lining, M J monel alloy, nylon plastic, monel P, N Y body directly processing hard alloy, W; 7. Models: (pressure rating 1) 16 said pressure is 16 kg ( 1. 6Mpa） Maximum to 64 mpa; ( 2) 150 lb class said American standard pressure, the maximum pressure rating of up to 2500 lb ( 150磅= 1。 6MPA/300LB=2. 5 - 4. 0mpa/400LB=6. 4mpa/600LB=10mpa） ; ( 3) Level 5 k said, pressure, maximum pressure of 63 k; Body material models: A titanium and titanium alloy, carbon steel, chrome molybdenum steel, P18 I C - 8 stainless steel, RMo2Ti stainless steel, S plastic. Ball valve selection principles: 1, oil, natural gas transportation director line, need cleaning the pipeline, and to be buried in the ground, selection of full size, full welded ball valve structure; Buried in the ground, choose the full size welded ball valve connection or flange connection; Branch, choose flange connection, welding connection, full size or reducing valves. 2, product oil pipeline and storage equipment, use flange connection of the ball. 3, city gas and natural gas pipelines, selection of floating ball valve flange connection and internal thread connection. 4 in the oxygen in the pipeline system, metallurgy system, appropriate chooses strict degreasing process, flange connection of the fixed ball ball valve. 5, the pipeline system and device of medium to low temperature, appropriate chooses and cryogenic ball Industrial Valves bonnet. 6, refining unit of catalytic cracking unit of piping system, can choose lifting lever type ball valve. 7, the chemical industry system in acid and alkali corrosive medium, such as equipment and piping system, appropriate chooses austenitic stainless steel, teflon for stainless steel ball valve seat sealing. 8, metallurgy system, power system, petrochemical plant, city heating system in high temperature medium pipeline system or device, can choose a metal to metal sealed ball valve. 9, the need for flow control, can choose the worm gear and worm drive, pneumatic or electric regulating ball valve with v-shaped opening. We take DQ41F - 16 P cryogenic ball valve is the first letter D meaning is the meaning of low temperature all cryogenic valves are the first letter D beginning the second letter Q means ball valve 4 is the third letter acronym flange connection fourth channel letters mean 1 ball valve position is the general formula for the fifth letter F means fluorine plastic seat sealing surface or the identity of the lining material sixth number 16 mean valve can work under pressure P 16 kilograms the seventh mean nominal pressure unit' MPA】 I this is just an example of valve model is usually so prepare a more detailed form should be a form letter corresponding to different models of the valve.
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