The introduction of vacuum pneumatic valve

vacuum pneumatic valve: refers to the working pressure is lower than standard atmospheric pressure of the pneumatic valve is low.
the several common form of vacuum pneumatic valve connection

flange connection which is the most commonly used form of pneumatic valve. Through the combination of the surface shape can be divided into the following categories:
) Smooth style: pressure pneumatic valve is not high. More convenient processing
) Lenticular: high working pressure, you can use a hard washer
) Mortise: larger plastic deformation gasket can be used in the wider use of corrosive medium, the seal.
) Trapezoidal groove: oval metal ring gasket in the use of work pressure, acuity kilogram per square centimeter of pneumatic valves, pneumatic valves or high temperature.
) Lens type: washing machine is the shape of the lens and metal production. For the working pressure or greater kg/cm2 pressure pneumatic valve, pneumatic valve or high temperature.
) O-ring style: this is a relatively new form of flange connection, with the appearance of the rubber sealing ring, and develops in the sealing effect, flat washer, reliable IT than normal.
, threaded connection
this is a simple way to connect, often used for small pneumatic valve. Is divided into two cases:
) Seal: directly from the external and internal thread seal directly. In order to ensure that the connection is not leak, often with lead, cotton and ramie thread woven and teflon tape to fill; Including teflon tape, is increasingly widely used, the material's corrosion resistance good sealing effect is good, easy to use and storage, disassembly, can completely remove it, because it is a sticky membrane, than lead, marijuana is much more superior.
) Indirect seal: pass between the two threads to tighten the plane to the power of the gasket, so, from the sealing gasket.