… appliances for pipes, boiler shells, tanks, vats or the like, including pressure-reducing valves and …
Explanatory notes
… appliances for pipes, boiler shells, tanks, vats or the like, including pressure-reducing valves and … similar appliances, used on or in pipes, tanks, vats or the like to regulate the flow (for supply, discharge, etc.), of … or diaphragm). They may be operated by hand (by means of a key, wheel, press button, etc.), or by a motor, solenoid, …