Yanche wrote: Yes, I know the cautions about having a valve. I wire the handle in the open position and tag it with a caution sign. If anyone knows a published plumbing code that does not allow properly installed and tagged service valve please post a reference.
I love a good challenge, John!The Mechanical Code of New York State
Section 1006: Safety and Pressure Relief Valves and Controls.
Safety and relief valves shall be installed directly into the safety or relief valve opening on the boiler or pressure vessel. Valves shall not be located on either side of a safety or relief valve connection. The relief valve shall discharge by gravity.
I paid $300 for a set of NYS code books. The mechanical code alone is $70. The NYS code is an adaptation of the 2000 International Mechanical Code. There is no footnote indicating that this is a NYS only addition, therefore, it is international code.