Abstract: A sealing gasket (20) for a vacuum pump, the sealing gasket (20) comprising: a first surface (30, 40); a second surface (32, 42) opposite to the first surface (30, 40); opposing side walls (34, 36; 44, 46) disposed between the first surface (30, 40) and the second surface (32, 42); and one or more protrusions (48a, 48b, 48c, 48d) extending from the first surface.

Abstract: A shell stator (12, 14) for a vacuum pump, the shell stator (12, 14) comprising: a seal groove (50, 52) formed in a surface of the shell stator (12, 14), the seal groove (50, 52) being defined by a first side wall (60), a second side wall (62) opposite to the first side wall (60), and a bottom surface (64) disposed between the first side wall (60) and the second side wall (62), the bottom surface (64) being opposite to an opening of the seal groove (50, 52); wherein the seal groove (50, 52) comprises: a protrusion (68) formed in the first side wall (60) and extending towards the second side wall (62); and an indentation (69) formed in the second side wall (62) opposite to the protrusion (68).

Abstract: A shell stator (12, 14) for a vacuum pump, the shell stator (12, 14) comprising: a seal groove (50, 52) formed in a surface of the shell stator (12, 14), the seal groove (50, 52) being defined by a first side wall (60), a second side wall (62) opposite to the first side wall (60), and a bottom surface (64) disposed between the first side wall (60) and the second side wall (62), the bottom surface (64) being opposite to an opening of the seal groove (50, 52); wherein the seal groove (50, 52) comprises: a protrusion (68) formed in the first side wall (60) and extending towards the second side wall (62); and an indentation (69) formed in the second side wall (62) opposite to the protrusion (68).

Abstract: A sealing gasket (20) for a vacuum pump, the sealing gasket (20) comprising: a first surface (30, 40); a second surface (32, 42) opposite to the first surface (30, 40); opposing side walls (34, 36; 44, 46) disposed between the first surface (30, 40) and the second surface (32, 42); and one or more protrusions (48a, 48b, 48c, 48d) extending from the first surface.

Abstract: A vacuum system non-return valve includes a baffle for extending across a flow path in the vacuum system and a valve member. The baffle has an aperture, a perimeter of the aperture has a valve seat. The valve member has a curved sealing surface configured to mate with the valve seat. The valve member and aperture are configured such that the valve member obscures the aperture and seals with the valve seat to impede a flow of fluid in a closed position and is displaceable in use to move away from the valve seat and allow a fluid flow in an open position; at least a portion of the surface of the baffle surrounding the aperture slopes towards the inlet end of the valve such that the aperture is smaller at the inlet end than it is at the outlet end.

Abstract: A vacuum system non-return valve includes a baffle for extending across a flow path in the vacuum system and a valve member. The baffle has an aperture, a perimeter of the aperture has a valve seat. The valve member has a curved sealing surface configured to mate with the valve seat. The valve member and aperture are configured such that the valve member obscures the aperture and seals with the valve seat to impede a flow of fluid in a closed position and is displaceable in use to move away from the valve seat and allow a fluid flow in an open position; at least a portion of the surface of the baffle surrounding the aperture slopes towards the inlet end of the valve such that the aperture is smaller at the inlet end than it is at the outlet end.