Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
163 words
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.
Claim 2
Dependent Claim
163 words
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.
Claim 3
Dependent Claim
22 words
The valve according to claim 1, wherein the secondary sealing surfaces have a larger membrane contact area than the primary sealing surface.
Claim 4
Dependent Claim
13 words
The valve according to claim 1 or 2, wherein the membrane is elastic.
Claim 5
Dependent Claim
14 words
The valve according to claim 1 or 2, wherein the valve seat is elastic.
Claim 6
Dependent Claim
28 words
The valve according to claim 1 or 2, wherein both the valve seat and the membrane are elastic, the valve seat having a lower elasticity than the membrane.
Claim 7
Dependent Claim
27 words
The valve according to claim 1 wherein the duct for fluid pressure actuation of the membrane is arranged to be connected to a source of compressed air.
Claim 8
Dependent Claim
27 words
The valve according to claim 1 wherein each secondary sealing surface comprises a step extending in the flow channel direction and spaced from the primary sealing surface.
Claim 9
Dependent Claim
23 words
The valve according to claim 7, wherein the valve seat widens in a concave fashion from the primary sealing surface to said steps.
Claim 10
Dependent Claim
27 words
The valve according to claim 8, wherein the valve seat widens from said steps in a concave fashion towards the flow channel wall opposite to the membrane.
Claim 11
Dependent Claim
22 words
The valve according to claim 1 wherein there is a shape transition between the primary sealing surface and the secondary sealing surfaces.
Claim 12
Dependent Claim
19 words
The valve according to claim 1 wherein the primary sealing surface has a concave profile across the flow channels.