OPERATION:
When de-energized, the poppet lifts to open flow from ② to ① ; Flow is also open
from ① to ② .
When energized ,the cartridge acts as a check valve, allowing flow from ① to ② , while
blocking flow from ② to ① , after overcoming the solenoid force.
Operation of Manual Override Option:
To override, push button in to activate. To return to normal valve function, release button.