Filling Loop. What is this?

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Guys,
Can anybody tell me whether this a check valve on the fill loop. It's getting on 25 years old but still works fine. What are the ports for? One is capped TEST, would that be pressure test and, therefore, could I install a pressure gauge there as the pressure gauge currently resides on top of the boiler on the pressure relief valve and the fill loop is in the upstairs airing cupboard. Useful!
Thanks.
 
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Looks like a check valve with the facility to test if it's working

At a guess, the top port looks like the position for a pressure gauge to be installed
 
it's NOT a reducing valve it is a check valve with a test port to make sure it works ;)
 
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Another atupid question... how does one use the port to test whether the valve is working?! :?:
 
Apply pressure to check that the valve does not allow reverse flow
 
Just for completeness, I finally got around to fiddling, and the valve pictured is a double check valve with a test port in the middle. The other two ports hold the springs. Therefore, have to tee in a pressure gauge rather than using one of the ports as I'd originally hoped.
 
20150726_140608.jpg
:whistle: 25 years later, I can finally fill up the system without having to run up and down the stairs like a lunatic!
 

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