Did you know, OSHA does not allow block valves on the inlet of relief valves installed on air receivers in compressed air systems?

OSHA CFR 1910.169(b)(3)(ii) states, “No valve of any type shall be placed between the air receiver and its safety valve or valves.”

However, installation of a block valve on the inlet of a relief valve can be considered acceptable for facilities located in states that enforce ASME boiler / pressure vessel code as the law (as indicated in the OSHA standards interpretation below).