smitty pan drain for steam shower.

[dradam]

I bought a steam generator for a steam shower that I am constructing. It sits in a "Smitty pan " for leakage or overflow that allows a 3/4 pvc outflow pipe.

The only place I can drain this is into a nearby drain stack that the sink empties into.

because pan should never have water in it I can not use a p-trap so I need a way to prevent the return of sewer gas in this open system.

I thought about a horizontal one way gravity closing valve but I am not sure this would close completely in a zero pressure situation.

I foung a device called e-z tap on the web which is basically a trap using a ball that sits in a cup blocking sewer gas. I have recreated this "waterless trap" using pvc pipe and a superball and think it will work well.

Does anyone have any other comments or suggestions?

Thank you

[hj]

Where does the heater's relief valve and drain line go to? The pan should be able to drain to the same point. I am not sure what kind of contraption you have devised, but I would worry about it not functioning if the sink drain backs up.

[dradam]

the heaters relief valve drains into the smitty pan.

If the sink drain backed up it would be a problem but it would be a problem even if I had a p- trap.

I will probably add a one way horizontal gravity closing valve beyond my contraption as an added measure of security.