VACUUM SEWER SYSTEM
VİAVAC VACUUM SEWER SYSTEM
Copyright © 2009 by Viatek Corporation. All rights reserved.
VİAVAC VACUUM SEWER SYSTEM COMPONENTS
1. THE VİAVAC VALVE PIT:
A) THE HIGH DENSITY POLYETHYLENE VALVE PIT (CHAMBER): The VİAVAC valve pit consists of 1" tick walls made from high density polyethylene. It is a single chamber valve pit rated for heavy traffic that can be installed in any street. The spools to connect the gravity lines from the houses are external so that the contractor does not have to insert pipes in the valve pit risking damage to its internal components.
B) THE BY PASS: The bypass with its ball valve is used in the case the Vacuflow valve fails and the pit has to be emptied manually. The by pass eliminates the need to use external pumps to empty the pit in the case of emergency or valve maintenance.
C) THE Vacuflow INTERFACE VALVE: The Vacuflow interface valve can be 63mm or 90mm in diameter. It is a completely pneumatic valve with an internal piston that will retract and close automatically when signaled by the float controller. When the piston inside the valve retracts, the wastewater and solids (like diapers and other objects) accumulated in the bottom of the valve pit are suctioned and propelled to the piping network.
D) THE FLOAT CONTROLLER: VİAVAC Vacuflow float controller is a simple and reliable vacuum valve controller. This float controller replaces traditional and complex differential air pressure controllers which are typically not waterproof and tend to require a great deal of maintenance. Our float controllers are 100% waterproof and carry a 5 to 10 year warranty.
E) THE INTERNAL AIR INTAKE: VİAVAC Vacuflow internal air intake is INSIDE the VİAVAC valve pit eliminating the need of installing external air intakes. External air intakes are 4" or 6" diameter candy cane style PVC pipes connected to the houses' gravity pipes. External air intakes are regularly cut off by vacuum sewer system users to drain storm water from patios and roofs into the sanitary sewers causing significant operational problems for vacuum sewer system operators. Also, external air intakes are aesthetically displeasing and can even become a health hazard. In contrast, our INTERNAL air intakes are inside the valve pit eliminating the need to build any overground installations on sewer system users' private properties.
F) THE PIT (MANHOLE) COVER: The VİAVAC valve pit uses a plastic, HS-25, heavy duty, high density polyethylene security cover with a locking mechanism. The plastic manhole cover is designed in accordance with AASHTO standards and weights approximately 36 kg.
2) THE VİAVAC VACUUM STATION: The vacuum station is the only place in the systems that requires electricity. A typical VİAVAC vacuum station includes vacuum pumps, collection tank, sewage pumps and the controls necessary to operate the vacuum system efficiently. This collection stations can be mounted on skids and pre-wired for ease of installation.
The VİAVAC Skid is typically housed in a two story structure with the vacuum pumps and control panel located on the top floor and the collection tank and sewage pumps on the lower floor.
3) VACUUM PIPE NETWORK
The pipe network of vacuum sewers consists of PVC or HDPE pipes of small diameter (typically 4”, 6”, 8” and 10“) installed in shallow trenches. A central vacuum station keeps this pipe network under negative pressure. Due to their small diameter, the pipes can be laid at depths of 32 to 48 centimeters under the ground surface. The addition of air makes the sewage lighter, which leads to higher transport speeds. The pipe network is laid in a ‘saw tooth profile’ which ensures that an open passage of air between the vacuum station and the valves is maintained throughout the piping network. Within this profile, a mixture of wastewater and air from the valve pit is transported via slight slope (~0.20%) to the vacuum station. The pipe network can be as long as 10,000 ft if the terrain is flat.
