Abstract: A delay valve comprising a housing including a side wall and opposed end walls and a plug in the housing cooperating with the side wall to define a first and second chamber. A check valve is provided in the plug permitting flow of air in one direction such that air may flow freely from the second through said check valve to the first chamber and is prevented from flowing from the first to the second chamber. The end walls of the housing have openings communicating with the exterior of the housing, and the plug has a peripheral portion that cooperates with the side wall of the housing to define a helical passage communicating with said first and second chambers.

Abstract: A throttle control system comprising a throttle member movable with the throttle and yieldingly urged toward a throttle closed position and a vacuum controlled positioning assembly including a housing, a diaphragm within the housing dividing the housing into two chambers. A stem is mounted on the diaphragm and extends from the housing through an opening. The plunger has a first cylindrical portion and a second portion including opposed parallel flat surfaces connected by arcuate cylindrical portions having the same diameter as the first cylindrical portion. The opening has longitudinally spaced portions. One portion is cylindrical and generally complementary to said first cylindrical portion of the plunger and the other portion has the same configuration as the second portion of the plunger. A spring yieldingly urges the diaphragm in a direction to retract the plunger inwardly of the housing.

Abstract: A butterfly valve comprising a body having a cylindrical passage and a diametral pivot pin and a butterfly valve plate fixed to the pivot pin. The plate is formed with a planar central portion at which the pin is connected to the plate. In assembly, the pin is first placed in position and then the valve plate is adjusted angularly and radially until the periphery of the plate is in sealing relation to the inner surface of the passage. The plate is then fastened to the pin by welding.

Abstract: A pressure-vacuum relief fuel filler cap comprising a cover, having a base and a peripheral flange, and a sub-assembly mounted at least partially within the cover with said peripheral flange surrounding a portion of the sub-assembly. The assembly comprises a body of synthetic plastic material including an outer threaded end adapted to engage a threaded filler opening, and an enlarged upper end with portions thereof engaging the base of the cover. A pressure relief valve and associated valve seat are mounted within the body and a vacuum relief valve and associated valve seat are mounted within the body. Torque limiting means are provided between the body and the cover for limiting the torque applied to the body during application to a filler opening, so that when a predetermined torque is reached, the cover can be rotated relative to the body and when the cap is rotated in the opposite direction, there can be no relative movement between the cover and the body.