ball check valves and swing check valves
The first one is similar
to ball Check Valves, but the plug that seals the valve is shaped like a cone.
It also can be called a lift Check Valve. It is a check valve in which the disc,
sometimes called a lift, can be lifted up off its seat by higher pressure of
inlet or upstream fluid to allow flow to the outlet or downstream side. The cone
is held on a bar, allowing it to lift out of the way when the water is flowing
and drop back into place when the water is off. If water backflows through the
pipe, it pushes up against the cone, creating a seal that keeps it from going
any further.
The second one is the disk valve which is also known as Swing Check Valve. It operates in the same manner as ball and cone valves, but the plug
that settles over the opening is a disk. Disk and cone valves tend to wear down
more because they have more moving parts and because they get bumped around on
top of the flow of water when it is turned on.
More products of valves
