Swing check the working principle of pneumatic valve

check pneumatic valve, also known as a one-way pneumatic valve or non-return valve, its purpose is to prevent the backflow medium pipeline. Pump suction off hand of pneumatic valve also belong to the check valve class. Open-close part by medium flow and power to open or closed, to prevent the backflow medium pneumatic valve check pneumatic valve. Check pneumatic valve belong to automatic pneumatic valve, check valve pneumatic valve is mainly used for medium on the one-way flow of pipeline, only allowed to medium flows in one direction, in order to prevent accidents.
check pneumatic valve according to its structure, can be divided into the lift check pneumatic valve, swing check valve and butterfly check three kinds of pneumatic valve. Pneumatic valve can be divided into vertical lift check check pneumatic valve and horizontal check pneumatic valve two kinds. Swing check pneumatic valve is divided into single type check pneumatic valve, double disc type check check pneumatic valve of pneumatic valve and valve type 3 kinds. Butterfly check valve pneumatic valve, pneumatic valve straight through the check for the above several check pneumatic valve in the connection form can be divided into the threaded connection check pneumatic valve, flange connection, check the pneumatic valve and welding check three kinds of pneumatic valve.
check pneumatic valve installation should pay attention to the following things:
. Do not make check pneumatic valve in the line to bear weight, large check pneumatic valve shall be independent support, make the pressure of impact from the piping.
. When installation should pay attention to the medium flow direction and pneumatic valve body by arrow in the same direction.
. Vertical elevating disc check pneumatic valve should be installed in vertical pipe runs.
. Elevating the level of disc check pneumatic valve should be installed in horizontal pipe runs.
check pneumatic valve nominal pressure or stress, PN. - 。 MPa, ANSI类- 、JIS- K or caliber: nominal diameter DN ~, NPS/connection mode: flange, butt welding, thread, socket and other applicable temperature: - ℃ ~ ℃ pneumatic valve body material: WCB, ZGCrNiTi, ZGCrNiMoTi, CF ( 、CF( L、CFM( 、CFM( L、Ti。 Choose different material, check the pneumatic valve can be respectively suitable for water, steam, oil, nitric acid, acetic acid, oxidizing medium, urea, and other media.
check pneumatic valve is only allowed to medium flows in one direction, the direction and stop the flow. Check the pneumatic valve is normally automatic work, in a direction of flow of fluid pressure, pneumatic valve open; In the opposite direction of fluid flow, the fluid pressure and pneumatic disc self-respect and ACTS on the pneumatic pneumatic valve seat valve, thereby cutting off flow.
check pneumatic valve including swing check pneumatic valve and lift check valve.
swing check pneumatic valve has a dielectric hinge institutions, there is also a like door pneumatic disc obliquely pneumatic freely on the seat surface.
in order to ensure that each pneumatic valve flap, pneumatic seat surface can reach the appropriate location, pneumatic valve installed in the hinge mechanism, so that pneumatic disc, with enough space of a swing, and pneumatic disc really, comprehensive and pneumatic seat contact.
all pneumatic disc can be made from metal, can be embedded in the metal on leather, rubber, or synthetic coverage, depending on the applicable performance requirements.
swing check pneumatic valve in the fully open conditions, almost unimpeded fluid pressure, therefore the pneumatic valve through the pressure drops for smaller.
lift check pneumatic valve pneumatic valve is located, is located in a pneumatic valve pneumatic valve seat sealing surface. This pneumatic valve in addition to the pneumatic disc is free to lift, like the rest of the cut-off pneumatic valve, fluid pressure pneumatic disc, from pneumatic valve seat sealing surface lift, medium return led to pneumatic valve pneumatic seat down, and cut off the flow.
according to the applicable condition, pneumatic disc can make all metal body, also can make the pneumatic disc frame inlay rubber mat, or in the form of rubber ring.
like stop pneumatic valve, fluid through the lift check pneumatic valve channel is narrow, so the pressure drop through the aerodynamic lift check valve, pneumatic valve is larger than the swing check, and swing check the flow rate of the pneumatic valve are very few restrictions.