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I've worked in the HVAC field for 25 years and have not come across the attached valve. It is installed in a steam line at a hospital in Vermont. The inlet side is attached to the building steam main at about 15 psi.The discharge side is piped up through the roof and emits a constant flow of steam to the outside. The Owner has done some research and has the understanding the valve serves as a pressure relief valve, in some capacity. The handwheel has cast lettering to turn clockwise to increase pressure.
I would appreciate any explanation on the purpose of this valve. Obviously it's very old and probably obsolete. The Owner is wondering if it can be removed and capped.