A dual flow regulator is simple to use, which makes it easy to get casual with. I keep a short set of rules for mine, and a checklist I run through when the flow doesn't look right. This note covers both, along with how I look after it between jobs.
Numbers I stay inside
The regulator is single-stage, with a gauge measuring range of 0–25 MPa and a rated outlet pressure of 0.2 MPa. Each flow tube is marked 0 to 60 SCFH. I treat the top of that scale as a ceiling, not a target. The working temperature is given as 0–50 °C, and I don't use it outside that band.
These figures are the whole of what I rely on. If a job seems to need more than the tubes show, I take that as a sign to rethink the job rather than push the regulator.
When the flow looks wrong
- Is the cylinder valve actually open? A closed valve shows nothing on the inlet gauge.
- Have I read the inlet gauge before opening either knob?
- Is the ball moving in the tube I think I'm adjusting? Each knob only controls its own tube.
- Are both hoses pushed fully onto their hose tails?
- Is the ball sitting on the SCFH mark I set, or has it drifted since?
- Did I start with both knobs closed before opening the cylinder slowly?
I go through them in order, because jumping ahead is how I end up adjusting the wrong side.
The oil rule
The dial says USE NO OIL, and I take that literally. Before fitting, I check the cylinder valve and the regulator inlet for any trace of oil or grease. My hands get wiped before I touch the inlet nut. I don't use any lubricant on the threads, and I won't put the regulator down on a greasy bench.
Care and storage
Between jobs the regulator goes back with its parts kept together: the two flow tubes and the two hose-tail fittings. Losing a hose tail would leave one side unusable, so they never get separated from the body.
I close the cylinder valve and both knobs before taking it off. It is stored dry and clean, indoors. Before the next use I give the gauge face and both tubes a quick look, since readable marks are the only way I can set each side properly.
The gauge range and outlet pressure are listed on nottool.co.uk for anyone who wants to check them.
Top comments (0)