Storage tank shutoff valve with double cam assembly

An assembly adapted for cutting off the flow of a fluid into a storage tank and the like in response to a first predetermined fluid level in the tank, comprising:

• a) a housing having an inlet and an outlet and an internal flow passage therebetween, said housing being adapted for placement in a storage tank;
• b) a valve assembly disposed in said housing, said valve assembly including a shutoff valve movable within said housing between a first open position permitting the flow of fluid through said internal flow passage and a second closed position substantially blocking fluid flow through said internal passage;
• c) a shield disposed within said housing in the internal flow passage between the inlet and the shutoff valve for at least partially diverting fluid flow around the shutoff valve and at least partially shielding the shutoff valve from direct fluid impingement from fluid entering the internal flow passage through the housing inlet;
• d) a guide associated with said housing for guiding movement of the shutoff valve in said housing;
• and
• e) an actuating assembly, said actuating assembly being interconnected to said valve assembly for moving said shutoff valve between said open and closed positions as a function of a fluid level in a storage tank, said actuating assembly including a cam assembly, said cam assembly having a first portion and a second portion, a first cam follower surface and a second cam follower surface, the first being operative to contact the the first cam follower surface to force said shutoff valve toward said closed position as a function of said first predetermined fluid level in said storage tank, and said second portion being operative to contact the second cam follower surface to force said shutoff valve toward said open position as a function of a second predetermined fluid in said storage tank.