Frequently Asked Questions
Got questions? We have answers! If the information below does not answer your query, please contact us. We’d be happy to assist.
What is the difference between GasStop and an EFV (excess flow valve)?
GasStop will completely (100%) and automatically shut-off the supply of gas in the event of a major leak or catastrophic regulator failure. GasStop must be reset manually, giving the user complete control. An EFV (excess flow valve) is often a self-equalising, automatically set, flow limiter, and may not shut-off the flow of gas 100%. Many EFV’s do not have manual resets.
How can GasStop test for minor leaks?
Always check your system for leaks before use. The GasStop pressure gauge is sensitive to minor drops in pressure, making it is a useful tool to use when performing a visual lock-up pressure test, also known as a pressure tightness test or pressure decay test.
This test can only be carried out prior to normal gas usage. During normal gas usage, GasStop will not shut-off the system in the event of a minor leak. During normal gas usage GasStop will only shut-off in the event of a major leak.
To test your system for leaks:
- Set up your system as described in your instructions. Turn off the tap on the gas cylinder. Now turn off your gas appliance(s).
- Now turn the gas cylinder back on. Keep all appliances off for the time being.
- Pump the pressure gauge on the GasStop up and down steadily at least 4 to 6 times. The longer the distance the gas has to travel in the pipe or hose, the more you will need to pump. If insufficient pressure has been created, the GasStop will keep shutting-off the gas supply. Double check at this point that your appliance is still switched off.
- The needle on the gauge should now indicate the gas pressure. If the needle is on zero, or below the red bar on the gauge, then the cylinder tap/valve is not open, GasStop has shut-off, the gas has run out or you have not carried out sufficient pumping. Is the temperature around freezing? Please refer to the Useful Tips section in your instruction booklet.
- Now turn off the tap on the gas cylinder and register the exact position of the needle on the gauge. Wait 60 seconds for Standard Installations and 5 minutes for longer gas systems (e.g caravans, motorhomes, boats and houses).
- At this point, pressurised gas is now held between the GasStop and your appliance(s).
- If the needle has dropped from its initial registered position at the end of the recommended period of waiting time, there is a leak (pressure decay). Do not use the gas system until the leak has been solved or repaired by an approved gas specialist.
- If, after pumping, the needle remains in the same position during the waiting time specified above, you can carefully start using the system.
Does the gauge read the exact level of gas in the gas cylinder?
No, it reads the pressure of the gas under load/usage. It therefore gives a meaningful readout of gas supplies during the consumption of gas (at phase equilibrium). See our FAQ section “Is the pressure gauge useful?” for more information.
Why do I have to leave the gas running to read the gauge, why isn't it instant?
As per above, the gauge operates much like a consumption gauge (e.g. an oil pressure gauge in a car).
Why does GasStop keep shutting-off when I try to use gas?
If installed correctly GasStop will only shut-off if there is a major problem with your system e.g. a major leak or catastrophic regulator/system failure. If no major leak is present it may be that an inappropriate appliance or regulator is being used. If you are ever in doubt, contact a gas specialist before using your gas.
Will one pump be enough to prime the GasStop?
No. GasStop requires several pumps of the gauge to ensure adequate priming.
Why do I need to tighten the GasStop to the cylinder with a spanner (screw-type connectors only)?
To ensure the fitting is gas tight, hand tightening is not sufficient. Ensuring your gas appliances and gas system are tight and leak free is essential and recommended across the industry. Always read our instructions before use.
Why are you encouraged to undertake a leak test prior to using your gas bottle?
We view this as best practice when assessing the safety and integrity of your gas system.
Is GasStop weather proof - can GasStop be left outdoors?
GasStop is made from high quality, surface treated brass and can withstand being left outdoors. Our gauge face is made from reinforced polycarbonate plastic. As with any brass device, weathering will happen over the course of many years. To slow this process we highly recommend covering your GasStop when not in use. Every GasStop purchased in Europe has a 5 year warranty with proof of purchase.
Does GasStop operate in extreme temperatures?
GasStop propane devices operate between -20 degrees C and 55 degrees C. GasStop butane devices operate from 5 degrees C to 55 degrees C.
Is GasStop tested?
Yes. Each and every GasStop is rigorously tested, referencing ISO 16964:2015. All of our fittings are designed in accordance with EN 15202:2012 and EN 16128:2013. All of our testing is evidenced via a global third-party test auditor.
Do I still need to use a pressure regulator with GasStop?
Yes. GasStop is designed to be used with regulators rated up to 50 mbar. Please note GasStop will not work with an EFV (excess flow valve) regulator.
Does GasStop affect the normal flow of gas in any way?
It has a very minor resistance but normal gas usage is not affected in any way.
Can I use GasStop for industrial applications?
We do not recommend using GasStop for industrial purposes, namely with high pressure appliances. GasStop is only to be used on a pressure regulated system no higher than 50 mbar.
Can I use GasStop on both propane and butane bottles?
It is clearly labelled on our packaging what type of gas the device is suited to. If you are not sure, please contact your local gas retailer/specialist.
Is GasStop compatible with all types of gas cylinders?
No. Please refer to our packaging or the retailer for case by case compatibility.
Can GasStop be used with a 50 mbar regulator?
Yes, GasStop can be used on regulators rated up to 50 mbar.
Is the pressure gauge useful?
The gas pressure gauge is a very useful, multipurpose tool.
– The gauge indicates when the gas cylinder is almost empty (a decline in the vapour pressure curve). The gauge does not indicate the exact amount of LPG left in the cylinder.
– A steady pressure reading only indicates that LPG is left in the cylinder.
-If the needle is pointing to:
HIGH: Increased gas pressure
GAS: Sufficient gas (steady pressure)
LOW: Almost empty (approximately 30 minutes left of gas use)
-As GasStop is directly installed into the bottle there are a few variables that can affect unregulated pressure, namely: temperature, amount of liquified gas vs rate of vaporisation, gas type and gas purity. There may also be other irregularities which affect the pressure reading.
-As per the instructions, it is advised to run the gas for a small period of time to have a better indication of gas level. This allows the LPG/pressure to reach something called “phase equilibrium”. Further to this point there is a “vapour pressure curve”, this is why it is recommended to run the bottle for a short while to allow for this process.
NB the gauge is also useful to represent the following:
- Visual evidence of pressure decay (a minor leak) in a lock-up pressure test scenario.
- Visual evidence of high pressure
- Visual evidence of a shut-off
- Visual evidence of an activated and stable system
- Visual evidence of variable/unstable pressure
CAN GASSTOP BE USED ON A BULKHEAD OR AUTOMATIC/MANUAL CHANGEOVER GAS PRESSURE REGULATOR?
Yes. GasStop can be used with an automatic or manual changeover gas pressure regulator, regulated to a pressure of no higher than 50 mbar. A GasStop will need to be installed on each bottle attached to the changeover device.
Can GasStop be used with a crash sensor valve?
Yes. GasStop can be used alongside a crash sensor valve, regulated to a pressure of no higher than 50 mbar.
Can a GasStop be used with an OPSO valve?
Yes, the two devices can be used together without interference. Unlike GasStop, an Over Pressure Shut-Off valve (OPSO) is not designed for major leak protection. For more information on GasStop vs OPSO valves, you can watch a useful explainer video here.
There is condensation inside the gauge - is this normal?
In humid, cool or changeable weather conditions, condensation may appear on the inside surface of the transparent gauge face. This happens as the air trapped inside the gauge condenses, forming small surface water droplets on the plastic casing. Although this is not common, it will not affect the operation of the GasStop. To rectify the problem, remove your GasStop from the gas system and leave the product in a warm and dry location. After a while the condensed water will evaporate and the visual appearance of the gauge will return to normal.
Is GasStop rated for marine use?
GasStop is not rated for marine use (namely in salt water conditions where ammonia exposure may be present). Please contact a marine gas specialist for further information on marine gas installations.
HOW CAN GASSTOP DIFFERENTIATE BETWEEN A MAJOR AND A MINOR LEAK?
GasStop will only shut-off in the event of a major leak. A major leak is defined as a sudden and dramatic change in the gas flow rate (≥110% ṁ). GasStop will not shut-off the supply of gas in the event of a minor leak (<110% ṁ).
If GasStop was calibrated to shut-off in the event of a minor leak, this would interfere with the ‘normal’ usage/consumption of your gas appliance(s) – GasStop would shut-off every time you use your appliance(s). We have therefore calibrated the device to shut-off for major leaks only (≥110% ṁ).
Lastly, it is in contradiction with EU standards to supply an LPG shut-off device that shuts-off below 110% of the guaranteed flow rate.