Gaslow low pressure from one cylinder

[Basildog]

Just to update: I disconnected the pigtails from the tee/gauge, and reconnected them the other way round, to see if the issue was in the gauge or the bottle+pigtails. Needless to say, the problem immediately vanished and hasn't reappeared, even after I restored the original connections. My best guess is that one of the NR valves in the gauge has become a bit sticky and sometimes doesn't open fully, but since the issue has now gone, there's not much I can do until it happens again .

Thanks for the assistance though.

Exactly what I was going to talk you through
Give me a call if you would like my advice

 

[scotjimland]

. My best guess is that one of the NR valves in the gauge has become a bit sticky and sometimes doesn't open fully, but since the issue has now gone, there's not much I can do until it happens again

sorry, but I dont understand that ..

a pressure gauge measures pressure.. not flow .. and since there is no flow through a gauge, it would not have an NR valve

there must be another reason..

or better explanation. Basildog

 

[Basildog]

sorry, but I dont understand that ..

a pressure gauge measures pressure.. not flow .. and since there is no flow through a gauge, it would not have an NR valve

there must be another reason..

or better explanation. Basildog

The Gaslow gauge and also the w20 tee are really just a way of connecting 2 cylinders .
So imagine if they didn’t have NRV’s and you decided to change a cylinder without turning the other one off
Far too often we see people who rely on the NRV and don’t have the second pigtail connected to a cylinder.
The unused pigtail should always be disconnected and the spare W20 outlet capped off .
Unfortunately the NRV’s have a habit of failing so this is what often causes the problem along with automatic changeover valves too
The simpler the better as with most things .
Here’s the cap we use on regulators and changeover tees etc
There should never be an open end anywhere on a gas system but obviously there might be for the short time a cylinder is being changed.

Gok W20 Blanking Cap

Truma/Gok blanking cap to suit W20 gas regulator connection.

autogasshop.co.uk

 

[tonyeva]

sorry, but I dont understand that ..

a pressure gauge measures pressure.. not flow .. and since there is no flow through a gauge, it would not have an NR valve

there must be another reason..

or better explanation. Basildog

Gaslow describes it as a "changeover gauge" but what it really is, is just a normal tee (twin M20 inlets to one W20 outlet) with an NR valve on each of the inlets. There is also a built in pressure gauge that displays the gas pressure at the outlet, but the gauge doesn't affect the way the tee works. So if one of the NR valves sticks closed while the other is OK, then gas will only be able to flow from one of the bottles to the outlet through the working valve, but not from the other. Hope that makes it clearer.

 

[tonyeva]

Gaslow describes it as a "changeover gauge" but what it really is, is just a normal tee (twin M20 inlets to one W20 outlet) with an NR valve on each of the inlets. There is also a built in pressure gauge that displays the gas pressure at the outlet, but the gauge doesn't affect the way the tee works. So if one of the NR valves sticks closed while the other is OK, then gas will only be able to flow from one of the bottles to the outlet through the working valve, but not from the other. Hope that makes it clearer.

Sorry, crossed over with basildog's reply...

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[tonyeva]

The Gaslow gauge and also the w20 tee are really just a way of connecting 2 cylinders .
So imagine if they didn’t have NRV’s and you decided to change a cylinder without turning the other one off
Far too often we see people who rely on the NRV and don’t have the second pigtail connected to a cylinder.
The unused pigtail should always be disconnected and the spare W20 outlet capped off .
Unfortunately the NRV’s have a habit of failing so this is what often causes the problem along with automatic changeover valves too
The simpler the better as with most things .
Here’s the cap we use on regulators and changeover tees etc
There should never be an open end anywhere on a gas system but obviously there might be for the short time a cylinder is being changed.

Gok W20 Blanking Cap

Truma/Gok blanking cap to suit W20 gas regulator connection.

autogasshop.co.uk

So would you suggest that I replace the (apparently dodgy) Gaslow changeover head with a tee without NRVs? If the NRVs are unreliable? I will always have two fixed bottles so there wouldn't be an unused pigtail or outlet.

But I can see why that might not be a good idea, so maybe just carrying a spare tee might be better

 

[scotjimland]

thanks.. my Gaslow system didn't have that T piece and gauge between bottles ,. hence my question