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A control valve for automatically maintaining a constant rate of flow of a fluid through a pipeline includes a housing having therethrough a passage including an inlet opening and an outlet smaller than the inlet opening. An orifice plate is positioned within the passage adjacent the outlet opening,

A control valve for automatically maintaining a constant rate of flow of a fluid through a pipeline includes a housing having therethrough a passage including an inlet opening and an outlet smaller than the inlet opening. An orifice plate is positioned within the passage adjacent the outlet opening, the orifice plate having therethrough an orifice. A regulating diaphragm is positioned within the passage at a location upstream of the orifice plate. The regulating diaphragm has therethrough circumferential ports and a central opening smaller than the orifice. The regulating diaphragm is formed of an elastic material such that the regulating diaphragm is deflectable toward the orifice plate in response to pressure differences across the control valve between a maximum deflected position, whereat the regulating diaphragm abuts the orifice plates, thereby closing the circumferential ports, and fluid flow is restricted by the central opening, and various positions whereat the regulating diaphragm is spaced from the orifice plate, thereby allowing fluid flow through the circumferential ports.

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A control valve for automatically maintaining a constant rate of flow of a fluid through a pipeline, said control valve comprising: a housing having therethrough a passage including an inlet opening and an outlet opening smaller than said inlet opening; an orifice plate positioned within said passag

A control valve for automatically maintaining a constant rate of flow of a fluid through a pipeline, said control valve comprising: a housing having therethrough a passage including an inlet opening and an outlet opening smaller than said inlet opening; an orifice plate positioned within said passage adjacent said outlet opening, said orifice plate having therethrough an orifice; and a regulating diaphragm positioned within said passage at a location upstream of said orifice plate, said regulating diaphragm having therethrough circumferential ports and a central opening smaller than said orifice, said regulating diaphragm being formed of an elastic material such that said regulating diaphragm is deflectable toward said orifice plate in response to pressure differences across said control valve between a maximum deflected position, whereat said regulating diaphragm abuts said orifice plate, thereby closing said circumferential ports, and fluid flow is restricted by said central opening, and positions whereat said regulating diaphragm is spaced from said orifice plate, thereby allowing fluid flow through said circumferential ports, said regulating diaphragm comprising at least two elongated elastic metal laminae arranged crosswise with respect to each other and connected in the area of crossing.