Combination Air Valve for High Flow - Non Slam
No.
Part
Material
1
Body, Bonnet
WCB、DI
2
Ball, Screen
Cover, Screen, Orifice
Seat
S304
3
Orifice Seal
EPDM
4
Non-Slam Disc
S304、S316
Technical Features:
1. It has the functions of air release valve and vacuum intake valve.
2. It can be adjusted to control and throttle the discharge of air during pipeline filling and during the return of the water column after separation.
3. The air release component is designed to automatically release small pockets of air to the atmosphere as they accumulate along a pipeline or piping system when it is full and operating under pressure.
4. The air & vacuum component is designed to automatically discharge or admit large volumes of air during the filling or draining of a pipeline or piping system. This valve will open to relieve negative pressures whenever water column separation occurs.
5. Working diagram
a. When water, rapidly filling the pipe line, pushes the air out through
the Air Valve, a differential air pressure is created across the valve orifice.
b. When this differential pressure reaches a prefixed level (usually it will
be prefixed at 0.02 - 0.03 bar) the orifice disc will close.
c. Air will continue to come out through the small orifice disc - until all
the air will be exhausted and water will reach the kinetic float. This double
stage kinetic air discharge prevents the slam effect and therefore suppresses
water hammer.
d. When water reaches the kinetic float, it lifts it up, closing the kinetic
orifice and completing the kinetic cycle.
e. The vented Check Valve Orifice Disc will come back to its normal open position.
f. When water is drained out of the pipe line, the resulting pressure
drop lets the kinetic float fall down, opening the orifice fully for
intake of high volume of air into
the line.
