Primary gasket for cylinder assembly and cylinder assembly

Abstract

The invention relates to a primary gasket (1) for a cylinder assembly (100), in which the cylinder assembly (100) comprises a cylinder (101) and a float (102) housed in a sliding manner in a float housing (104) delimited by a cylinder wall (103) of the cylinder (101) to pressurize a fluid, in which the primary gasket (1) comprises an annular body (2), the annular body (2) extends in a circumferential manner at least along a circumferential direction (C-C) around the axial direction (X-X), where the primary gasket (1) defines a radial direction (R-R) perpendicular to the axial direction (X-X) and the circumferential direction (C-C), where the annular body (2) is configured to be housed in a primary gasket housing (105) defined in the cylinder wall (103), where the annular body (2) is configured to be housed in the primary gasket housing (105). The primary gasket receptacle (105) is delimited radially by an axial receptacle wall (107) and axially by a first radial receptacle wall (108) and a second radial receptacle wall (109), the first radial receptacle wall (108) and the second radial receptacle wall (109) being connected to the axial receptacle wall (107), the annular body (2) comprises an inner lip (4), a central lip (5), an outer lip (6) and a back portion (3), where the back portion (3) comprises a back abutment surface (13) configured to abut against a first radial receptacle wall (108) of the primary gasket receptacle (105), where the back abutment surface (13) is configured to abut against a second radial receptacle wall (108) of the primary gasket receptacle (105). The inner lip (4), the central lip (5) and the outer lip (6) extend axially from the back portion (3) on a side opposite to the back abutment surface (13) and are radially spaced apart from one another, where the inner lip (4) is configured to form a seal with the float (102), where the outer lip (6) is configured to form a seal with the axial receptacle wall (107), where the inner lip (4) is configured to form a seal with the float (102) and the central lip (5) is configured to form a seal with the axial receptacle wall (107). The central lip (5) comprises an annular lip body (14) extending axially between the back portion (3) and a central lip edge (15), where the annular lip body (14) has a central lip thickness (S) in a radial direction (R-R), where the central lip edge (15) comprises at least one central lip abutment portion (7), where the central lip abutment portion (7) has a central lip thickness (S) in the radial direction (R-R). The at least one central lip abutment portion (7) is configured to abut against the second radial wall (109), where the central lip (5) comprises at least one radial opening (9), where the at least one radial opening (9) passes through the central lip thickness (S), thereby defining a closed side opening profile (8) in the annular body (14).

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