초록 ▼

A valve of the membrane valve type comprises a valve body with two fluid flow channels (5, 5′) separated by a land portion which forms a valve seat (6) having a sealing surface for co-operation with a flexible membrane (7) mounted over a duct (8) which opens in front of the valve seat and is arrange

A valve of the membrane valve type comprises a valve body with two fluid flow channels (5, 5′) separated by a land portion which forms a valve seat (6) having a sealing surface for co-operation with a flexible membrane (7) mounted over a duct (8) which opens in front of the valve seat and is arranged for fluid pressure actuation of the membrane between a closing position, where the membrane (7) sealingly contacts the valve seat (6), and an opening position where there is a flow channel communicating space ( 11) between the valve seat (6) and the membrane (7). The valve is characterized in that the sealing surface of the valve seat (6) comprises (i) a primary sealing surface (10) located nearest and facing the membrane, and (ii) a secondary sealing surface (12, 12′) provided on each fluid channel side of the valve seat, so that when the valve is closing, the membrane (7) successively seals against the primary sealing surface (10) and the secondary sealing surfaces (12, 12′), and, inversely, when the valve is opening, the member (7) is successively separated from the secondary sealing surfaces (12, 12′) and the primary sealing surface (10).

대표청구항 ▼

A valve comprising a valve body with two fluid flow channels separated by a land portion which forms a valve seat having a sealing surface for co-operation with a flexible membrane mounted over a duct which opens in front of the valve seat and is arranged for fluid pressure actuation of the membrane

A valve comprising a valve body with two fluid flow channels separated by a land portion which forms a valve seat having a sealing surface for co-operation with a flexible membrane mounted over a duct which opens in front of the valve seat and is arranged for fluid pressure actuation of the membrane between a closed position, where the membrane sealingly contacts the valve seat, and an open position where there is a flow channel communicating space between the valve seat and the membrane, wherein said sealing surface of the valve seat comprises (i) a primary sealing surface located nearest and facing the membrane, and (ii) a secondary sealing surface provided on each fluid channel side of the valve seat, so that when the valve is closing, the membrane successively seals against the primary sealing surface and the secondary sealing surfaces, and, inversely, when the valve is opening, the membrane is successively separated from the secondary sealing surfaces and the primary sealing surface.