The RAF 01 manual valve is a Normally Closed (N.C) line pressure hydraulically actuated.
The 3-W selecting cock valve changes positions: The RAF 01 valve opens when 3-W selecting cock valve is turned to position "0".
The RAF 01 shuts off when 3-W selecting cock valve is turned to position "C". The 3-W ball valve configuration together with Raphael's patented diaphragm enables smooth opening and surge free shut off.