Shower sump non-return valve

[GSL]

Can anybody recommend a good quality non-return valve that I can put in my shower sump box.

The valve currently fitted is a "duck-bill" type, and no matter what I do to it, there are currently two valves in line, water seeps back through the valves and results in the pump running every 15 - 20 minutes through the night, very annoying.

The pipe size is 19mm.

Thanks

Graham

 

[Tranona]

Why not replace the automatic switch with apositive on off switch. There should be no need for an automatic switch in a shower sump pump as the amounts of water flowing back can only ever be very small if you have a loop above the water line in the outlet hose.

 

[GSL]

The complete system is under the saloon floor, and it is not possible to put a loop in the outflow pipe down there.

When the float switch activates, the sump drains well down, it is the flowback, about 2 litres, that causes it to recycle.

With a positive switch, I would be very concerned that someone, (me), would have a shower and forget to turn the pump on, which would result in flooding.

GL

 

[nedmin]

My shower sump had an aortic rubber non return valve,it gave the same probs as yours so I got a 15mm non return valve from plumbers merchants this wasnt big enough so changed for 22mm and works superb.

 

[pvb]

The problem with valves in shower drain plumbing is that hair can stop them sealing properly.

 

[oldsaltoz]

Perhaps a smaller diameter hose and shorter will reduce the back flow.

 

[starfire]

I think there is a pump on the market that has some electronics in to make the pump run for a period after the float switch trips, rather than leaving some water in sump.


Having had the same problem & getting up in the night to lift the float, I might make a box to do the same.

 

[GSL]

Thanks for the replies so far, however my problem is not the water left in the sump after the pump turns off, it is the flowing back of water through the non-return valve.

Thanks

Graham

 

[Danny]

The complete system is under the saloon floor, and it is not possible to put a loop in the outflow pipe down there.

When the float switch activates, the sump drains well down, it is the flowback, about 2 litres, that causes it to recycle.

With a positive switch, I would be very concerned that someone, (me), would have a shower and forget to turn the pump on, which would result in flooding.

GL

How about a manual switch in parallel with the float switch. That way you could run the pump manually whenever you want to drain the shower sump completely or stop the cycling of the water left in the pipe, without worrying about flooding if you forget to turn it on.

I'm assuming that the float switch leaves enough water in the sump for this method to be effective. If not you might have to adjust the float switch.

 

[nedmin]

Not had probs with hairs etc using the 22mm NVR, but did with the aortic rubber valve.If you use a 22mm one try to finish at each end with a Yorkshire solder type coupling as these have a rim that contains the solder,this enables the Jubilee clip to seal better.Rake out the solder with a small screwdriver in case it comes loose.Comes out easy.

 

[nedmin]

PS to previous post,forgot to say I reduced from 22mm to 15mm for the hose.

 

[Tranona]

The complete system is under the saloon floor, and it is not possible to put a loop in the outflow pipe down there.

When the float switch activates, the sump drains well down, it is the flowback, about 2 litres, that causes it to recycle.

With a positive switch, I would be very concerned that someone, (me), would have a shower and forget to turn the pump on, which would result in flooding.

GL

Seems to me to be a bad design if water can flow back into the sump and you are relying on a NRV for security. Is the through hull below or above the waterline?

If you can arrange a manual switch it is easy to operate. You have a waterproof button and issue instructions that the shower must be pumped out after use.