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VALVE STUCK OPEN POSITION
Velan valve 14" stuck in the open position on a main steam distribution system. It was exposed to a leak which in turn created humidity in a hot manhole enviroment and over time seized the operating valve in the open position.
We have attempted to muscle the valve with cheaters lube/grease and 10lb sledge hammers to try and unfreeze the valve but to no avail.
Today I attempted to undo the valve stem and use a torch rose bud to heat up the upper portion of the valve that drives the stem ... also, no avail.
I used a compression tank with pneumatic gun to vibrate the valve and introduce the oil and lube ... but still no matter how much muscle we attempt to force it with the darn thing wont move.
I am thinking of using a wall anchor and a come along next perhaps with a 3rd person using a sledge at the same time.....
As you can see this is been an ongoing problem for us.
The valve stem is stainless and the operating mechanics that drive it are forged steel i believe.
Corrosion resistance or electrolysis ?
Any help would be appreciated.