The padlocks or car seals can only be installed with the internals in the proper position. No special tools are necessary for switching. Eliminates the possibility of inadvertently closing a block valve either upstream or downstream of the intended active safety relief valve. Overpressure protection of process maintained at all times during switchover. The installed interconnecting linkage ensures that both inlet and outlet Safety Selector Valves switch simultaneously.
Selector valves in tandem are of the same line size as the relief valve flanges.
Dual Safety Relief Valve System Redundant relief valve systems can be heavy and bulky, require significant field fabrication, installation time and expense, and can be difficult and confusing to operating personnel. The Anderson, Greenwood Safety Selector Valve provides a better alternative. Redundant safety valves discharging into a closed header system utilize all of the inherent advantages of the AGCO Safety Selector Valves. The two safety relief valves, two safety selector valves, and a simple linkage are pre-assembled at the factory. Only one flanged inlet and one flanged outlet connection are required to be made up in the field.