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When my full time/long time fire investigator was still alive. I asked him Why do the RV bottles blow up or explode? His answer was no matter if the valve is open/closed IF a fire is burning nearby the heat can and will cause the bottle/tank to vent. Venting propane causes, you guessed it more fire. So, a leak might be stopped by a on/off valve or a safety stop valve. If the fire is going the bottles or tanks in or on the RV can still blow up from venting propane.
If your home is newer and you find a flexible copper pipe running from the meter into your utility room, you probably have a higher pressure gas system. In this case, your inside main shutoff valve ( Photo 3) is probably near your furnace or water heater, just before it enters a flying saucer–shaped doodad called a pressure regulator. There’s also a chance your home—especially if it’s older—doesn’t have a house-side main shutoff valve. Photo 4: Hang a wrench near the shutoff If you’re working near the main or individual gas valve and clearly know the source of the gas leak and that gas hasn’t been leaking for long, shut off the valve and get out. But if you’re uncertain of the source or how long the gas has been leaking, clear yourself and your family out and call the gas company or fire department from a neighbor’s house (not your own—remember, phones can generate sparks!). Always err on the side of caution. It is my understanding that the OPD valve (overflow protection valve) on every propane tank not only limits filling of the tank but also protects the tank when there is nothing connected to the valve. With nothing connected, you can open the tank valve and there will be no escape of propane gas. However, once you connect a hose to the valve, the OPD valve is opened.
Also note: When you shut off main or individual gas valves, you’ll be extinguishing the pilot lights to certain appliances. Many newer appliances have “pilot light–less” electronic ignition systems, but if you have older appliances, you’ll need to relight the pilot lights. Most appliances have clear relighting directions on a label near the pilot light or in the instruction manual.
When you repair or replace a gas appliance, use these shutoff valves to stop the flow of gas. (Most pros replace the flexible connector when they replace the appliance.) If you discover you have a faulty supply valve, or your system doesn’t have one, turn off the gas using the house side main shutoff valve. When closed, stop valves create a tight seal that prevents any fluid from flowing through the pipe. When closed, gate valves create a small gap between the gate and the seat that allows some fluid to pass through even when the valve is closed.It might not seem important until suddenly it really is. Please believe me when I say, being able to shut off supply of water and/or gas to your home is very important. Today we’re just going to talk all about your gas supply
Most service valves are single-lever ball valves; again, handle parallel to the line means gas is flowing, perpendicular means it’s cut off. On dryers and ranges, this valve is usually hidden behind them and can only be reached by sliding the appliance out from the wall. This service valve will usually be at the end of a fixed pipe and connected to a flexible supply pipe called an appliance connector. Take care not to kink or pinch this flexible pipe. Stop valves are typically made from brass, bronze, or stainless steel, while gate valves are typically made from cast iron or ductile iron.Yeah I know of the tank EFV device. The claim of the company that makes the gas stop valve is that the tank EFV (excess flow valve) are a self equalizer flow limiter and may not close off the flow 100% in a failure of a hose or regulator. Since these things can leak like crazy and cause tremendous damage, I’m replacing it with a standard supply stop as soon as I’m done with this story. We had a saying in all my clinics, "When you hear hoofbeats, think horses, we don't live in Africa, so it's not going to be zebras"..... What that means is: Look for the common problems, not those "one in a million events"..... Our company ethos is to supply quality products and innovative solutions ensuring we offer an exceptional customer experience at a fair price. Houses with natural gas have a main shutoff valve ( Fig. A) located just before the gas meter. This valve, often called the street-side valve, is normally a rectangular nub ( Photo 1). When the long side of the nub or handle is parallel to the incoming gas line, it’s open and the gas is flowing. When it’s turned a quarter turn, perpendicular to the incoming pipe, it’s closed.
Stop valves are typically used in applications where it is necessary to completely shut off the flow of fluid, such as in residential and commercial plumbing. Gate valves, on the other hand, are typically used in industrial applications where it is necessary to control the flow of fluid. Their claim is their product, when it detects an excessive flow like when a propane hose gets cut into, their valve shuts off 100% of the flow and must be manually reset to allow gas to flow again.Some things in life are worth learning before it’s too late—like the locations of your water and gas shutoff valves. Now granted, these shutoff valves are often hidden in some dark, creepy corner of the house. But if a water pipe springs a leak, knowing where the shutoff valve is could save you thousands in water damage repairs. What’s more, you can’t make those major plumbing repairs or improvements unless you first turn off the water. The same goes for turning off the gas—though with some strict safety precautions, which we’ll talk about later.
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