Valves for controlling fluid flow

Claim 1

A valve of the character described comprising a valve body having an annular seating coaxially disposed in a bore thereof; a disclike stopper in said bore and cooperating with said seating; an operating spindle rotatably carried by said valve body and extending across the bore thereof and across the back of the stopper; a cam rotationally fast with the operating spindle and arranged for coaction with the back of the stopper, said cam having a flat portion and an eccentric rounded portion which flat portion coacts with the back of the stopper for imparting opening and closing swinging movement to the latter on corresponding rotation of the operating spindle while the rounded portion coacts with the back of the stopper for effecting initial opening lifting movement of said stopper and final closing seating movement thereof; headed projections extending from the back of the stopper at each side of the cam and spindle; a pair of crosspiece blocks carried by the spindle one at each side of the cam, said blocks correspondingly receiving and wholly accommodating in separate counterbored bores therein said headed projections together with compression spring means about said projections and which act between the heads of the latter and the blocks, said blocks being of faired end form in order to be streamlined in relation to fluid flow through the valve.