A valve having a flexible diaphragm for opening and closing the valve. The diaphragm is biased into valve-closing position by a ridge, formed in the valve body, which presses the diaphragm toward the valve seat.GLOBE VALVE A rigid backup washer is secured to the diaphragm solely by an elastomeric type adhesive. A bleed hole in the diaphragm establishes communication between the valve inlet port and a chamber on the side of the diaphragm opposite the valve seat.Butterfly Valves The bleed hole is in the margin of the diaphragm which is sandwiched between two portions of the valve body. A valve comprising: a valve body having an inlet port, an outlet port,Bellows Seal Valves and a valve seat between said ports, a flexible diaphragm within said valve body and movable into and out of engagement with said valve seat to close and open the valve, respectively, and non-resilient, rigid means engaging said diaphragm only in a region radially outwardly of the region of said diaphragm which engages said valve seat for biasing said diaphragm into engagement with said valve seat, said rigid means being capable of fully closing the valve without the aid of any other closing force when the pressure is equal on both sides of said diaphragm. This invention relates to valves, and more particularly to a valve of the type in which a flexible diaphragm within the valve controls the flow of fluid through the valve. The invention is especially concerned with providing a very fast operating valve capable of producing a short duration, maximum flow pulse. Ideally, the opening time and closing time for such a valve approaches zero, so that the pulse produced comes as close to a square wave as possible. Valves of this type are particularly suited for use in dust collecting equipment wherein the filter bags, or other elements on which the dust is collected must be shaken or jarred periodically to remove the collected dust from them, the dust usually falling into a collection hopper. The quicker such a valve opens, the greater is the jarring effect produced by the fluid pulse leaving the valve for any particular fluid pressure applied to the valve. Furthermore, since a number of such valves are often operated in sequence and supplied with fluid from a single fluid pressure source, the quicker such a valve closes, the less the supply source is taxed and the sooner the next valve in the series can be operated.

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