These are replacement stainless steel main load springs compatible with Parker Series 9 pulse valves and Ideal Vacuum High-Speed Pulsed Solenoid Valves. The main load spring provides the closing force for the valve when the solenoid coil is de-energized. If the main load spring becomes corroded, brittle, or broken, due to long-term use or chemical exposure the valve will fail to close properly.

See drawing below for spring replacement location.