What is the vacuum pneumatic valve? An overview of vacuum pneumatic valve

vacuum pneumatic valve is refers to the working pressure is lower than the standard atmospheric pressure of the pneumatic valve.
vacuum pneumatic valve is its working pressure under normal atmospheric pressure applied to the vacuum system of pneumatic valve. Vacuum pneumatic valve ( Vacuumvalves) Not only has simple structure, small volume, light weight, material consumption, installation size is small, and the drive torque is small, easy operation, fast, and also has good flow regulating function and close the seal characteristics, vacuum pneumatic valve in large and medium caliber has broad field of use, low and medium pressures. Classification:

the types of vacuum pneumatic valve common vacuum pneumatic ball valve, vacuum pneumatic high vacuum butterfly valve, pneumatic valve, high vacuum pneumatic diaphragm valve, vacuum belt pneumatic pneumatic electromagnetic valve, electromagnetic high vacuum flapper electromagnetic high vacuum pneumatic valve, pneumatic valve, high vacuum fine-tuning pneumatic valve, pneumatic high vacuum flapper valve, high vacuum flashboard pneumatic valve, pneumatic valve, ultra high vacuum baffle ultra-high vacuum flashboard pneumatic valve, etc.
driven style:
vacuum pneumatic valves are manual, pneumatic, electric and electromagnetic dynamic four type, on the hand, powered by compressed air, power supply and electromagnetic force by actuator, pneumatic valve plate ( Pneumatic valve, pneumatic valve, pneumatic valve opening and closing. Common connection form of

live flange connection
this is the connection forms of pneumatic valve used most frequently. According to the joint surface shape can be divided into the following kinds:
) Smooth type: used for low pressure pneumatic valves. Processing more convenient
) Lenticular: high work pressure, can be used in hard washer
) Mortise type: plastic deformation is larger washers are available, and in the corrosive medium is used more widely, the sealing effect is better.
) Trapezoidal groove: with oval metal ring gasket, used to the work pressure of kg/cm2 or pneumatic valve, pneumatic valve or high temperature.
) Lens: the washer is lens shape, made of metal. For work pressure of kg/cm2 or high pressure pneumatic valves, pneumatic valves or high temperature.
) O-ring type: this is a relatively new form of flange connection, it is with the emergence of a variety of rubber o-ring, and developed, it is reliable in sealing effect than ordinary flat washer.
threaded connection
this is a simple connection method, often used for small pneumatic valves. Divides two kind of situations:
) Direct seal: internal and external thread sealing effect directly. In order to ensure that joint not leak, often filled with lead, cotton and ramie thread woven and ptfe teflon tape; The ptfe teflon tape, became more and more widely used; The corrosion resistance of the material is very good, good sealing effect, easy to use and preservation, remove, can be fully removed, it because it is a layer non-viscous film, much more superior than lead, cotton and ramie thread woven.
) Indirect seal: the power of the screw tight, transfer to the gasket between the two plane, plays a role of sealing washer.