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I just started having an issue with my evactube system. I'm getting thermal siphoning at night. I installled a flow control valve (check valve wiih manual overide) by B & G #107035 about three years ago to stop this and it's been working great until now. I don't know if the spring inside has broken or if the seat is bad without taking it apart. I checked with the local plumbing supply house where I purchased the valve and they said B & G does not make a rebuild kit. Instead of replacing it with the same valve, I'm thinking about installing a 2 way selonoid valve. I would hook it up to my circulator and when the controller signalled it to start, the valve would open at the same time and then it would shut when the circulator stopped.
I need a 2 way valve normally shut, with 3/4" NPTF, 110 volts AC, working pressure is about 25 PSI, temperatures reaches 175 degrees and compatible with glycol. I would also like to find one with a built in manual override so that during summer months I can manually open the valve to create thermal siphoning to dump some of the stored heat at night. If they don't make them with a overide, I'll just install a bypass. Anyone have any ideas on a manufacturer for both styles of valves? Thanks.