Abstract: A vehicle for transporting and discharging dumpable material is described which is particularly adapted to allow substantially complete evacuation of the material from the vehicle into a container having raised sides, without the need for either lowering the container below the level of the vehicle or raising the vehicle. The vehicle of the invention includes a tiltable tank container structure, that can be either an enclosed tank or an enclosed or semi-enclosed bed, and that is inclined above the vehicle chassis so its forward end points downward with respect to the vehicle chassis.

Abstract: An automatic shutoff valve has a main inlet, a main outlet, and a main passage from the main inlet to the main outlet formed in a valve body. A piston chamber formed in the valve body has a valve seat in the main passage. A piston is movable back and forth through the piston chamber between a first position in engagement with the valve seat to close the main passage and a second position out of engagement with the valve seat to open the main passage. A first seal lies between the piston and the piston chamber to create on the piston a first area against which fluid pressure in the main passage acts to urge the piston toward its second position. An actuator is movable through a control chamber in fluid communication with one end of the piston chamber.