Is this normal in the Midwest? Spence Pilot
Spence/Pilot Operated Steam Pressure Regulators. 1; 2 · Next. Pilot Operated Steam Pressure Regulators. Spence ED Steam Pressure Reducing Valve 1" NPT 10- We are digging deep in our video vault to look back at some highlights from Boiler University's Weekly Boiler Tips archives. Campbell-Sevey - Pilot Operated Pressure Reducing Valve Lou Spence (1917–1950) was a fighter pilot and squadron commander in the Royal Australian Air Force during World War II and ...