Operating positions for 2-port valves might be either shut (closed)
to ensure that no flow whatsoever undergoes, fully open

for max flow, or
sometimes partially available to any degree among. Such valves are
already called by various names for example

regulating, throttling,
metering, or wafer ball valve .For
example, needle valves have elongated conically-tapered discs and
matching seats for fine flow control. For a lot of valves,

there might
be a mechanism to point because when much the valve is open, but on many
occasions other indications of flow rate

are engaged, including
separate flow meters.

2, the stem thrust bearing reduces friction torque, smooth operation can stem the long-term flexibility.
3, the seat sealing performance, the use of Teflon and other seals made of elastic material, the structure easy to seal, and the pneumatic valve of the valve closure increased capacity with medium pressure increases.
4, stem seal, reliable, turning the stem only for transportation and do not do fake down movement, not easy to damage the valve stem packing seal, and sealing ability increased with the increase of the pressure medium.
5, the PTFE and other materials have good self-lubrication, the friction loss is small and the ball, so the pneumatic valve for long life.
6, download-type stem and stem head convex order to prevent the exhaust valve stem, stem seal damage, such as fires, convex order and the body can form a metal contact, to ensure that stem seal.
7, anti-static function: the ball valve, valve body is placed between the springs, can export the generation of static electricity switching process.

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