The pressure setting can never be above the allowable working pressure of the water heater as stated on the water heater s data plate.
Proper pressure relief valve extension termination above floor.
Once the air pressure has been equalized the valve securely closes preventing the escape of gas until the pressure drops again.
Discharge through an air gap located in the same room as the water heater.
When considering a safety valve downstream of a steam pressure control valve the total capacity of the safety valve at the set point must exceed the steam.
Again for safety of anyone nearby when it goes off.
Discharge to a termination point that is readily observable by occupants because discharge indicates that something is wrong and to prevent unobserved termination capping.
The discharge piping serving a pressure relief valve temperature relief valve or combination valve shall.
When the temp or pressure becomes excessive the valve will relieve that pressure as often as is necessary.
Mount the safety valve vertically with the valve s spindle in the vertical position above the pipe centerline figures 2 and 3.
The example shown below with the pipe almost touching the floor will impede the water flow and cause it to splash upwards.
The inlet steam piping to the safety valve must be equal to or larger than the safety valve inlet connection.
The pressure relief valve extension is plastic and has a couple of elbows leading it to a drain.
The temperature pressure relief valve tprv is an incredibly important life safety device on every water heater.
I always advise the client that the pipe should be copper and should terminate about 6 inches from the floor.
Aavs can be used to service an individual fixture or several what s permitted depends on local code and the model being used units like the redi vent can accommodate a mere 20 dfus drainage fixture units.
I explain that it was routed to a drain to prevent a mess if it discharges but that you would want to see water on the floor if it was dripping or pressure had blown off so that you know.
The watts 210 is a gas shutoff valve and relies only on temperature and must be manually reset once it has operated.
A safety valve not mounted in the vertical position can influence the set pressure of the valve.
Not have tee.
A pressure relief valve is.
Pressure and temperature relief settings are stamped on the valve.
Not be directly connected to the drainage system.
Be piped independently of other equipment drains water heater pans or relief valve discharge piping to the point of discharge.
Not be smaller than the diameter of the outlet of the valve served and shall discharge full size to the air gap.
Serve a single relief device and shall not.
The watts valve in your photo is a standard temperature and pressure relief valve.
This will prevent the safety valve from operating in the simmer mode which the code does not allow.
Unlike the expansion tank which is intended to protect the piping system from pressure the tprv protects the water heater tank from experiencing.
8 termination of the tpr drain pipe cannot be more than 6 inches or less than two pipe diameters above the floor ground or waster receptor flood rim level.
Its proper functioning is the difference between a nice hot shower and an explosion.
