Sanitary Sewer Air relief Valve
Sanitary Sewer Air relief Valve
(OP)
I have a 2" force main that I have to relocate so it is going up and over a new culvert. I am showing an air relief valve to be installed in a sidewalk adjacent to the rise in the pipe, however when I went to look for details the closest I could find is an air relief valve that comes off of a 6" main with a 2" line. To me it seems to use a 2" line off of a 2" line would be overkill, any suggestions as to the line size?
thanks
thanks





RE: Sanitary Sewer Air relief Valve
RE: Sanitary Sewer Air relief Valve
RE: Sanitary Sewer Air relief Valve
saxon
RE: Sanitary Sewer Air relief Valve
Just because the line size is small does not mean there can't be problems. You can get airlock with a 2" or 200" main if the conditions are right. The water hammer only occurs when these valves slam shut forcing the flow of liquid through the forcemain instead of air out of the valve. Some valves are designed to reduce this.
There are numerous manufacturers of air release valve and some have more benefits than others. Some of them also have backflow options available that help with the O&M.
These valves will spit some wastewater so you must put them in a location that can drain. You also do not want to put them in sealed environment. I had one in a manhole with a cast-iron lid that sealed itself just enough that the valve did not function properly. Once a small hole was drilled in the lid, the valve operated fine.