classification of stainless steel check valves -凯发彩票

check valves only allow the medium to flow in one direction and prevent direction flow.
normally this valve is operated automatically, and under a fluid pressure that flows in one direction, the disc opens;
when the fluid is in the opposite direction, the self - overlapping disc of the fluid pressure and the disc acts on the seat, thus cutting off the flow.
swing check valve
the swing check valve has a hinge mechanism, and a gate like valve is free to rest on the inclined seat surface.
in order to ensure that each disc to seat the appropriate location, in valve design hinge agencies, so that the disc with enough space of a swing, and real, comprehensive, and the valve seat contact.
the disc can be made entirely of metal and can be embedded in the metal with leather, rubber or synthetic coverage depending on the performance requirements.
when the swing check valve is fully open, the fluid pressure is almost impervious, so the pressure drop through the valve is relatively small.
lift check valve
the valve flap of the lift check valve is located on the valve seat seal face.
in addition to this check valve can be freely valve movements, like the rest of the cut-off valve, fluid pressure from the valve seat sealing surface lift, medium return led to the disc back to seat, and cut off the flow.
depending on the conditions of use, the disc may be an all-metal structure or in the form of a rubber pad or rubber ring on the disc rack.
like a cut-off valve, fluid through the lift check valve channel is narrow, so the lift check valve through the pressure drop than the swing check valves are bigger, and swing check valves are very few restrictions.
stainless steel flue check valve
1) the original plastic check valve is made in the same way.
the whole is made of stainless steel or stainless steel.
need perforation installation, the advantage is to have a one-way fire prevention effect, smoke proof effect general.
2) it is the latest type of check valve which is installed in the latest card button. the whole is made of stainless steel or stainless steel, and the valve vane type is better sealed.
the installation is simpler, the only inadequacy is, still one way fire.
it was not able to meet the state fire administration's requirements.
disc check valve
the disc circle the check valve around the pin shaft in the seat.
disc check valves are simple in structure and can only be installed on horizontal pipes and are poorly sealed.