AIRVAC Vacuum liquid conveyance and collection systems consist of three
A. AIRVAC Vacuum Interface Valve Package - collection
basin, vacuum interface valve, and pneumatic controller/sensor unit.
B. AIRVAC Piping Network - liquid transport mains, branches, and
C. AIRVAC Vacuum Station - vacuum collection tank,
vacuum pumps, liquid pumps, electrical panel, and control devices.
The collection process begins when fluid enters the valve package
collection basin (sump). As the liquid level in the basin rises,
air pressure increases against the pneumatic sensor. At a preset
level, the sensor actuates the controller. The controller then opens
the interface valve.
The open interface valve allows fluid collected
in the basin to be evacuated into the piping network. Since the collection
tank and piping network are maintained at 1/2 atmosphere (or less)
of pressure, atmospheric pressure in the basin literally pushes the
collected fluid into the piping network.
The lower pressure in the
piping network and collection tank is maintained by vacuum pumps
at the vacuum station. These vacuum pumps remove the air admitted
with the fluid.
The vacuum mains empty into the collection tank at
the station. Level sensors in the collection tank activate the liquid
discharge pumps. The liquid pumps then transport the collected fluid
to treatment facilities and/or holding tanks.
About AIRVAC OVS Liquid Conveyance Technology for Industry
Bilfinger Airvac Water Technologies Inc.
introduced the very successful model AV3 vacuum interface valve in 1970.
This 3”, solids-handling valve is the key component in a system
designed specifically to collect domestic sewage. The many patented features
of the interface valve package applied in conjunction with AIRVAC proprietary
piping design quickly established AIRVAC as the standard by which other
vacuum conveyance technologies are measured.
At the same time that Bilfinger Airvac Water Technologies Inc. engineers were refining criteria for municipal
vacuum collection systems, regulatory agencies around the world were
examining the many sources of environmental pollution. Regulations developed
by these agencies included increasingly stringent criteria for the handling
and transport of industrial process fluids and waste.
As more and more
entities implemented strict enforcement of these regulations, it became
apparent that many industries had a need for a secure, user-friendly
fluid transport system to satisfy these regulations without seriously
disrupting production. This led many plant managers and designers to
consider alternative technologies that might provide cost-effective liquid
In response to the needs of industrial users, Bilfinger Airvac Water Technologies Inc.
research and development engineers have developed a family of specialized
chemical and heat resistant liquid handling valves. Additionally, proven
AIRVAC piping design standards have been adapted for use in Overhead
Vacuum System (OVS) piping networks as documented in the OVS Design
AIRVAC OVS liquid conveyance schemes are often a cost effective
means of resolving environmental, health, and safety issues related to
the transport of process fluids and industrial wastewater.