The Original "Anti-Shock" Air Release and
Vacuum Break Valve.
The unique defence against pipe bursts and pipeline system damage!
Series 'RBX'
The unique Vent-O-Mat Series 'RBX'
Air valve incorporates three standard air
valve functions and also comes standard with an integral Surge
Alleviation Mechanism that protects the pipeline from surge and
water hammer (see below for further detail).
1.High volume air release - The Vent-O-Mat 'RBX'
releases high volumes of air during pipeline filling
(Click 'replay' to view)
Air enters Orifice (3), travels through
the annular space between the cylindrical floats (4), (5), and (6)
and the valve Chamber Barrel (2) and discharges from the Large
Orifice (1) into atmosphere
2.Pressurised air release - The Vent-O-Mat 'RBX' releases pressurized
air through the small orifice during pipeline operation
(Click replay to view).
Subsequent to the filling of a
pipeline, liquid enters the valve Barrel Chamber (2) and the Floats
(4), (5) and (6) are buoyed so that the Large Orifice (1) is closed
by Float (6), the valve will then become internally pressurized. A
minimal working pressure of < 0. 5 bar (7. 3 psi) acting on the
relatively large area of the Orifice(1)will lock Float(6)into the
closed position across the Large Orifice(3).
Disentrained air rises through the liquid and accumulates in the
valve chamber, when the volume of air is sufficient to displace the
liquid, Float (4) will no longer be buoyant and will gravitate
downwards thereby opening the Small Orifice (7) and allowing
accumulated air to be discharged into atmosphere, as air is
discharged the liquid raises Float(4)and re-seals the Small
Orifice(7)and prevents escape of liquid.
3. High volume air intake - The Vent-O-Mat 'RBX'
intakes high volumes of air when a negative pressure has formed in
the pipeline during pipeline draining. The Vent-O-Mat 'RBX' outlet
is equal to the size of the inlet, this ensures the least possible
resistance to the intake of air and consequently the least
possible negative pressure within a draining pipeline
(click replay to view).
Simultaneous drainage of liquid from
Valve Chamber (2) causes Floats (4), (5) and (6) to gravitate
downwards onto the Baffle Plate (9), thereby allowing atmospheric
air through the valve to rapidly displace draining liquid in the
pipeline and prevent potentially damaging internal negative
pressure.
4. Automatic Surge Protection - All Vent-O-Mat 'RBX' valves come standard with
a unique function that
protects your pipeline from surge and water hammer. This function is independent of any mechanical
devices ensuring reaction
in a very low milli second
(click replay to view).
In reaction to increased air flow, Float
(6) closes Large Orifice (1) and air is forced through the Anti
Shock Orifice (8) resulting in deceleration of the approaching water
due to the resistance of rising air pressure in the valve.
RBXb
'RBXb' for submersible and deep well pump applications.
(See catalogue for more detail)
RBXp
'RBXp' a Nylon Valve for Seawater applications. Read more here.
RBXv
'RBXv' for air release only. No Vacuum break.
(See catalogue for more detail)
