Poppet valve having external adjustment for a flow restrictor

Details Poppet valve having external adjustment for a flow restrictor Poppet valve having external adjustment for a flow restrictor

F - Mech Eng,Light,Heat,Weapons

16

K

F16K 1/52 (2006.01) B08B 9/02 (2006.01) F16K 1/54 (2006.01) F28G 15/00 (2006.01)

Patent

CA 2172536

A poppet valve has a flow restrictor downstream of the poppet which is externally adjustable by rotation of the poppet valve stem. The restrictor is in the form of a throttle ring threadedly mounted on a valve guide and the throttle ring has a diameter less than that of the valve port sealed by the poppet so that the assembly of the throttle ring is removable through the valve port while inadvertent removable is prevented by projecting cap screws on the throttle ring extending to a diameter greater than that of the valve port. The valve poppet is also provided with a contour area adjacent the seat which provide a restriction after initial opening movement of the poppet to minimize erosive wear on the poppet sealing surfaces when the pressure drop occurs adjacent these surfaces.

L'invention concerne une soupape à champignon comportant un limiteur de débit à l'aval de la soupape (49), ce limiteur de débit étant réglable extérieurement par rotation de la tige de soupape (52). Le limiteur de débit est constitué d'une bague d'étranglement (71) montée par filetage dans un guide de soupape (33). Le diamètre de la bague d'étranglement est inférieur à celui de la lumière de soupape (16). La soupape ferme sa lumière de façon étanche. Le montage de la bague d'étranglement est conçu pour que la bague puisse être extraite au travers de la lumière de soupape. Toutefois, le démontage involontaire de la bague d'étranglement est interdit par le débordement de boulons à tête selon un diamètre supérieur à celui de la lumière de soupape. A proximité de son siège, la soupape comporte une zone profilée assurant une limitation après le mouvement initial d'ouverture. Cette limitation a pour objet de minimiser l'usure par érosion des surfaces d'étanchéité de la soupape pour les cas où la chute de pression se produit de façon adjacente à ces surfaces.

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