Excess flow check valves are normally open safety valves for installation in lines flowing into and out of pressure tanks. Its main function is to stop the full flow of the tanks liquid contents automatically should a flow line rupture and reset automatically when repairs are made. Therefore, It should be installed in the tank fitting or as near as possible to the tank. It can be used in various other piping systems to limit flows to a predetermined maximum flow. It can allow flow in either direction but only triggers in the specified flow direction.

Exciter Transformers is designed to step up the mains voltage and supply the real power required by the test system. An exciter also provides galvanic isolation and electrostatic shielding of the high voltage test circuit from the mains. The exciter is either installed in the HV reactor tank or housed in separate grounded steel, oil filled tank with output termination. It is designed as an isolation transformer with an electrostatic shield for additional filtering of PD noise and for transient protection. The exciter is fitted with an independent voltage divider for driving the exciter kilovoltmeter in the control section.