Patent ID: 6102367
Filing Date: 2000-08-15
Classification: F16K,Y10T

Abstract:
A gas tap comprising a body with an internal opening and closure member interacting with a sealing seat, an external operating element and a connecting stem for transmitting the movement of the operating element to the opening and closure member wherein the opening and closure member are arranged in such a way as to be held against the sealing seat under the effect of the pressure of the gas, in that the operating element comprises a cylindrical sleeve which has a first screw thread that makes the sleeve move axially when the operating element is turned and in that there is a second screw thread with a different screw pitch so as to alter the effect brought about by the first screw thread, wherein the different screw pitch is selected to selectively reduce the actuating force necessary to initially crack open the closure member against the pressure of the gas that is acting to keep the closure member closed and reduce the effect of the pressure of the gas acting on the closure member.