Cock pump the cock of the principle of the pneumatic valve and the main classification

cock pneumatic valve is closed or the rotation of the plunger type pneumatic valve, through the rotation degrees of the fortress of the pneumatic valve opening and pneumatic valve body in the same or separate, spilling a pneumatic valve is opened or closed.
the shape of the cock of the pneumatic valve pneumatic valve plug into cylindrical or conical. In cylindrical pneumatic valve plug, the channel general rectangular; In the pneumatic valve plug taper, channel into a trapezoid. The shape of the structure of the pneumatic valve cock become light, but also produced a certain loss. Pneumatic valve is best suited for cock as cut off and on medium and diversion, but according to the applicable properties and sealing surface erosion resistance, sometimes also can be used for throttling. Plug clockwise to make groove parallel to the pipe is open, the plug degrees counterclockwise to groove with a vertical pipe is closed.
cock pneumatic valve type mainly divided into the following kinds:

a, tight pattern cock pneumatic valve tight cock pneumatic valve is typically used for low pressure straight pipe, sealing performance depends entirely on the plug and plug the inosculation between good or bad, the sealing surface pressure is relying on a nut at the bottom of the screw. Commonly used in PN or less. Mpa。
2, pneumatic valve
filler filler plug plug pneumatic valve is done by pressure filler plug and plug seal. Due to the packing, so sealing performance is better. Usually this cock pneumatic valve packing gland, need not out of pneumatic valve plug, thereby reducing the leak of a working medium. The cock pneumatic valve used for PN Mpa pressure or less. Three pneumatic valve, sealing plug

pneumatic valve sealing plug is done by the pressure of the medium itself pressure tight seal between the plug and plug. Plug the head up, out medium through inlet holes into the plug head, will plug upward pressure, this kind of structure is generally used in air medium.
4, pneumatic valve oil seal plug
cock in recent years, expanding the application range of the pneumatic valve in the pneumatic valve with a forced lubrication oil seal plug. Due to forced lubrication between the sealing surface of the plug and plug to form a layer of oil film. This sealing performance is better, easy opening and closing, to prevent the damage of sealing surface