Again, get oil where you can and apply enough heat that it is just uncomfortable to hold. With a hyde, wood or plastic mallet, tap the top of the valve stem gently until the piston just starts to move. Install the valve button again and pull. If it won't move, apply a little more heat and tap just a little harder.
Shut the water to the house off, turn on the hot and cold lines on the faucet until the water stops running than shut then off. With one wrench on the old valve, and another wrench on the water line coming from the wall, turn the wrench in the valve counter clockwise until the valve loosens up and you can take it off.
Heres how; First, turn off the gas in the house so you don't blow yourself up or cause a disaster, loosen the bottom nut, tap the bottom of the plug upward to loosen the tapered plug, remove the tapered plug, lubricate with a special gas valve grease , and re-install the plug, job done.
If you can't see any damage or build up on the tap, it may simply require a little bit of additional force. Grab a wrench and gently but firmly turn the tap anti-clockwise until it begins to move. Be careful to not apply too much pressure, as you don't want to damage the tap accidentally.
Most often this is very simple, although in extreme cases, can be a challenge. First, never use plyers, which will cause damage to both the caps and casings. The best way is using a cowhide or wooden mallet, lightly tap around the circumference and try unscrewing it again.
Take a pair of vice-grips and grab the bottom threads (not too tightly so that you damage them, just enough to hold them) and with another wrench, try to remove the valve.
So what causes gas valve failure? Gas valves get worn out over time, or they can get damaged by excessive basement moisture or water seepage. However, there could be other culprits. A faulty ignitor, circuit board, or thermocouple could also keep your furnace from creating heat.
Proper lubrication of valve components can reduce wear; improve durability and dependability; and help deliver pipeline content safely, efficiently and respon- sibly. Such lubrication also can help preserve valve seal, seat and packing materials to ensure leak-free operation.
Then the valve gets stuck in the new position. Stiction can be caused by several factors: sticky valve internals, undersized actuators, tight shutoff, media viscosity, and more.
Seized valves are common
For older valves, seizure is often due to corrosive particulate build up, whereas newer valves can suffer from excessive force in the 'wrong' direction.
Use of the Day: Keep valve stems and faucets rust-free by spraying them with WD-40.
A valve that sticks closed will often result in serious and costlyengine damage. Each time the cam-tappet-pushrod-rocker try toopen that stuck valve, you risk catastrophic engine damage.
Chemola™ Desco 660 is a superior gate valve lubricant/sealant formulated with 100% synthetic oils and non-soap thickeners. It is very effective in gas service (except chlorine, bromine, fluorine, and oxygen) and highly resistant to washout.
If the pressure switch is not working properly, it can cause the gas valve to get stuck in the open position. Another possible cause of a stuck furnace gas valve is a faulty thermostat. If the thermostat is not working properly, it can cause the furnace to overheat.
Then spray some penetrating oil on the stem so it can seep down through the rubber washer or packing material, which will hopefully free up the corrosion inside the valve which is causing the stuck shut off valve. Wait a couple of hours, and then try to loosen the valve.
Another frequent failure in ball valves is when the valve becomes stuck and fails to open or close properly. This can be caused by various factors, such as rust, corrosion, or improper lubrication of the valve's moving parts.
Drip the penetrating oil down the valve's shaft and give it some time to soak in. Use your hammer to help the oil's distribution by lightly tapping the body of the valve. The key word is lightly – you don't want to unnecessarily damage anything. Try turning the valve with your hand after tapping a few times.
Lubricate it. If cleaning doesn't work, you can try using a penetrating oil like WD-40 around the perimeter and any exposed crevices of the handle to loosen it. Let the oil sit for a moment before trying to wiggle it free.