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Ball valve, opening and closing part (ball) driven by the valve stem and rotating around the ball valve axis. Can also be used for fluid regulation and control, hard sealing V-type ball valve v-type ball core and hardfaced metal valve seat has a strong shear force, especially suitable for containing fiber, small solid particles and other media. The multi-pass ball valve in the pipeline can not only flexibly control the confluence of media, shunt, and flow direction switch, but also close any channel and make the other two channels connected. This class of valves should generally be installed horizontally in the pipeline. Ball valves are divided into pneumatic ball valves, electric ball valves and manual ball valves.
1. Wear resistance; Since the hard seal ball valve spout is alloy steel,
Sealing ring is alloy steel surfacing, so hard seal ball valve in the switch will not produce too much wear. (Its hardness coefficient is 65-70) :
2. Good sealing performance; Due to the hard seal ball valve seal is artificial grinding, until the spool and seal ring can be used. So its sealing performance is reliable.
Iii. Light switch; Because the hard sealing ball valve seal ring bottom USES the spring to make the seal ring and the spool tightly hold together, so in the outside force exceeds the spring pretension when the switch is very light.
Long service life: it has been widely used in petroleum, chemical industry, power generation, paper making, atomic energy, aviation, rocket and other sectors, as well as People's Daily life.
Pneumatic ball valve structure is simple and compact, reliable sealing, convenient maintenance, sealing surface and sphere are often in a closed state, not easy to be eroded by the medium, easy to operate and maintain, suitable for water, solvent, acid and natural gas and other general working medium, mainly used to cut off or connect the medium in the pipeline, can also be used for fluid regulation and control.
1. Butterfly valve features simple structure, small volume, light weight, low material consumption, small installation size, quick switch, 90° reciprocating rotation, small driving torque, etc. It is used to block, turn on and adjust the medium in pipeline, with good fluid control characteristics and sealing performance.
2, butterfly valve can transport mud, at the mouth of the pipe liquid minimum. Good sealing can be achieved under low pressure. Good adjustment performance.
3, the streamlined design of butterfly plate, so that the fluid resistance loss is small, may be said to be an energy-saving product.
4, the valve stem for the through rod structure, after conditioning treatment, has a good comprehensive mechanical properties and corrosion resistance, abrasion resistance. Butterfly valve open and close when the stem only rotary motion and not for lifting operation, stem packing is not easy to destroy, sealing reliable. It is fixed with the disc tapered pin, and the overhanging end is designed to prevent the disc stem from crashing when it breaks unexpectedly at the connection between the disc stem and the disc.
5. Connection methods include flange connection, clamping connection, welding connection and lug clamping connection.
The driving forms include manual, worm drive, electric, pneumatic, hydraulic, electro-hydraulic linkage and other actuators, which can realize remote control and automatic operation.
1. Easy and quick opening and closing, labor-saving, small fluid resistance, can be often operated.
2. Simple structure, small external size, short structure length, small volume, light weight, suitable for large diameter valves.
3, can transport mud, at the pipe mouth of the liquid storage minimum.
4. Good sealing can be achieved under low pressure.
5. Good adjustment performance.
6. When the valve seat channel is fully open, the effective flow area is large and the fluid resistance is small.
7, the opening and closing moment is small, because the rotary shaft on both sides of the butterfly plate by the medium action is basically equal, and the direction of the torque is opposite, so the opening and closing is less effort.
8, sealing surface materials are generally rubber, plastic, so the low-pressure sealing performance is good.
9. Easy installation.
10. Flexible and labor-saving operation, manual, electric, pneumatic and hydraulic modes can be selected.
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