backflow valve

backflow valve

[′bak‚flō ‚valv]
(engineering)

backwater valve, backflow valve

A type of check valve in a drainage pipe; reversal of flow causes the valve to close, thereby cutting off flow.
References in periodicals archive ?
The Department of Public Works and Parks is extending its Backflow Valve Rebate Program to include commercial and industrial properties.
After having the sewer line snaked, jetted and scoped, we learned that the backflow valve cap had broken off and become lodged in the line.
This doesn't include the costly and controversial backflow valve requirements that are costing businesses and homeowners millions of dollars.
If running outside the structure and less than 18 inches deep, the supply line to the backflow valve must be metal.
The firm added a specially designed screw with a precise backflow valve, a special barrel and its accurate temperature control module to ensure the exact heating of the mold to its electric machine and created the EC-LSM.
In Figure 2, these categories are applied to the example of the plasticating unit of an injection-molding machine, particularly the backflow valve.
We used a pressure-type backflow valve that's commonly used with irrigation systems.
all backflow assemblies are to consist of a backflow valve with compatible gate valves.
The city offered to pay part of the cost for a backflow valve for homes affected in 2005.
Tenders are invited for well services (including oil, gas, and water): drilling, plu include pull the existing pump from well #3 and replace the motor including backflow valve, pump end, and tubing as well as disinfecting the well to put it back into working condition.
6" meter, backflow valve, spool, shutoff valves, strainer and bypass line; tie line to existing line at barracks with tee, sleeve, valve and box; install 45, 90 and 22 1/2" with mega lugs and concrete lickers at ditch, road, vault fence and tie in; install 33c at drive and parking lot; remove existing 4" backflow and cap line.
The project consists of two main objectives: the addition of an 8 RPDA backflow valve on the fire system on the east side of the existing vault (Scope 1) and the addition of a 4 RP backflow valve at the domestic water supply service meter (Scope 2).