Description
Product:
Check valve:
definition
Check valve is the valve relies on
media flow to automatically open and close the disc, is used to
prevent the media backflow, also known as check valve, one-way
valve, reflux valve, and back pressure valve.
function
Check Valve is an automatic valve,
its main function is to prevent the media backflow, prevent pump
and drive motor reverse, and discharge the container medium. Check
valve can also be used in pipelines that its pressure which may
rise to exceed the system pressure auxiliary supply.
classification
according to its structure and
installed methods Check valve can be divided into
1.Swing Check Valve: Swing check valve disc is cylindrical
disk-shape, around the seat channel axis to do rotational movement,
due to inner channel is the streamline, the flow resistance is
smaller than the lift check valve, apply to the low flow rate and
seldom flow changes large-caliber occasions, but it should not be
used for pulsatile flow, its sealing performance is less than lift
type. Swing Check Valve is devided into single disc, double disc,
multi disc. These three types are mainly according to valve
diameter, for the purpose to prevent the media stopping flow or
reflux, reducing the hydraulic compact.
2.Lift Check Valve: disc slides along the body vertical axis, lift
check valve can only be installed in horizontal pipelines, the
high-pressure small-diameter check valve upper disc uses ball.
Lift-type check valve body shape is the same with globe valve
(commonly used to the globe valve), so its flow resistant
coefficient is larger. its structure is similar to globe valves,
body and disc are the same with globe valve. upper disc and lower
bonnet have guided sleeve, the disc guided sleeve can freely lift,
when the medium downstream, the disc opens by media thrust, when
the media stopped-flow, the disc relies on self-vertical landing on
the seat, affected as preventing media backwash. Straight-through
lift check valve inlet and outlet media channel direction is
perpendicular to seat channels; vertical lift-type check valve, its
media inlet and outlet channel direction is the same with the valve
seat passage, its flow resistance is smaller than the
straight-through type.
3. butterfly Check Valve: the check valve that disc rotates around
the seat pin. Its structure is simple, can only be installed in
horizontal pipelines, with poor sealing.
4.Pipeline Check Valve: disc slides along the centerline of the
valve body. Pipe-type check valve is a new valve, and its small
size, light weight, processing technology is good, is one of valve
development. But the fluid resistant coefficient is slightly larger
than the swing Check Valve.
5.Clamp-in valve: This valve is used for boiler feed water and
steam off, it has the integrated function of lift check valve and
stop valve or angle valve.
