Check the use of the pneumatic valve

because check pneumatic valve in most actual use qualitatively determine for fast shut down, and in the check pneumatic valve is closed instantly, the medium is the direction, as the pneumatic valve closed, medium from the rapid rate of maximum back down to zero, while the pressure rise rapidly, generating possible damage to pipeline system of 'water hammer' phenomenon. For more than one pump in parallel for high pressure pipeline system, check the pneumatic valve water hammer problems become more prominent. Water hammer is one of the pressure transient flow in the pipeline pressure wave, which is caused by the change of the fluid velocity in pressure piping pressure jump or fall rise of the hydraulic impact phenomenon.
check pneumatic valve installed in the pipeline, which become a complete line of fluid components, one of the pneumatic valve opening and closing process will be affected by it in system is influenced by transient flow state; Close the characteristics of the pneumatic valve and, in turn, have hair effects on fluid flow state. Check the working characteristics of pneumatic valve is load change is big, small open-close frequency, one in closed or open, apply cycle is very long, and does not require moving parts movement. But once again the 'switch' requirement, you must move flexibly, the requirement of the more common mechanical movement is more demanding.
this type of pneumatic valve's role is only allowed to medium flows in one direction, the direction and stop the flow. This 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 from the overlap of pneumatic disc on the pneumatic seat, thereby cutting off flow.
swing check pneumatic valve in the fully open conditions, almost unimpeded fluid pressure, so the pressure drop through the pneumatic valve is relatively small. Aerodynamic lift check valve is located on the pneumatic valve pneumatic pneumatic valve seat valve 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 from pneumatic pneumatic valve seat valve seal surface lift, medium return led to pneumatic disc to seat, and cut off the flow. According to the conditions of use, pneumatic valve can be all-metal structure, can also be embedded in pneumatic disc shelves rubber mat or rubber ring form. Like stop pneumatic valve, fluid through the lift check pneumatic valve channel is narrow, therefore the aerodynamic lift check valve through the pressure drop than the swing check some pneumatic valve, pneumatic valve and swing check are very few restrictions.
with pneumatic valve is check belong to this type of pneumatic valve, which includes swing check pneumatic valve and lift check valve. Swing check pneumatic valve with the humble hinge institutions, there is also a pneumatic disc * freely like door in the tilt of the pneumatic valve seat surface. In order to ensure that each pneumatic valve pneumatic valve seat surface to appropriate location, pneumatic in valve design hinge agencies, in order to pneumatic valve kai xuan has enough space, and make the pneumatic disc real and comprehensive engagement with the pneumatic valve seat. Pneumatic valve can be made from metal, can be embedded in the metal on leather, rubber, or synthetic coverage, depending on the use of performance requirements.
the physical cause of the produce is the incompressibility of fluid, fluid motion inertia and elastic pipe combination results. In order to prevent water hammer in pipeline risk, over the years, people in the design of the check pneumatic valve, adopted some new structure, new material, in ensuring the check of pneumatic valve is applicable for the performance at the same time, minimize the impact of the water hammer has achieved gratifying progress. Check pneumatic valve is refers to the flow and automatically according to the medium itself, move the disc, used to prevent the backflow medium pneumatic valve, also known as non-return pneumatic valve, pneumatic valve, one-way flow pneumatic valve, pneumatic valve and back pressure. Check pneumatic valve belongs to a kind of automatic pneumatic valve, its main role is to prevent the backflow medium, to prevent the pump and drive motor reversal, and the discharge of the container medium. Check the pneumatic valve can also be used to give the pressure could rise to more than the system pressure of the auxiliary system supply piping. Check the pneumatic valve mainly can be divided into pneumatic valve, swing check In accordance with the center of gravity rotating) Pneumatic valve and lift check ( Move along the axis) 。