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22mm High Temperature Non Return Valve (Read 433 times)
thescruff
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Re: 22mm High Temperature Non Return Valve
Reply #4 - Mar 17th, 2017, 10:43am
 
Hep v° trap should do the job
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Re: 22mm High Temperature Non Return Valve
Reply #3 - Jan 19th, 2017, 6:53pm
 
Presumably you can't use an air gap to prevent back flow because air must not get back in either?

1m head of water is about 1.4psi.

Google found these..

http://www.tamo.co.uk/products/valves-regulators/check-valves

http://www.tamo.co.uk/uploads/products/20100216034318-200series.pdf

Says they can do cracking pressures down to 0.1psi and temperatures up to 288C.

I think in this situation I'd explain the problem to a company like that and let them decide if they can warranty their check valves for the application.
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Braunton, North Devon, United Kingdom
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Re: 22mm High Temperature Non Return Valve
Reply #2 - Jan 19th, 2017, 6:05pm
 
I'm not sure they are going to work on the near no pressure of an overflow/drain from a steriliser.  1m head maximum.
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Re: 22mm High Temperature Non Return Valve
Reply #1 - Jan 17th, 2017, 6:59pm
 
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Braunton, North Devon, United Kingdom
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22mm High Temperature Non Return Valve
Jan 14th, 2017, 3:00pm
 
I have a site with several sterilisers installed.  They have a 15mm chromed pipe outlet for the waste which is opened once a day, ditching 85°C water.  Currently, they all have the 15mm pipe terminating into a 22mm overflow waste non return valve, and these fail regularly.  The 22mm overflow pipe leaving the non return valve also overheats and bows.

This is the part:

...
http://www.plumbcenter.co.uk/product/mcalpine-convalve-in-line-non-return-valve-...

It seems to me that a metal version would be better, to cope with the heat, and 22mm metal pipe, not overflow.  The overflow eventually terminates into the 1.5" wastes, and these are not affected by the hot water.

Any ideas on the best way forward?

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