The company listed in the rule book made mine. It was installed as a push with an over center spring to keep it in position. Under high pressure it would not shut off so I made it a pull and the problem was solved.
You can call Steve Davies about the solenoid. They may treat it like an electrical solenoid for parachute actuation. It's OK but you need a mechanical override. That's the way I would do it. Acuate both the solenoid and manual valve during inspection Good Luck.