Abstract The invention relates to a backstop ring for a stuffing box or the like which is cooperable with a carbon sealing ring. The main parts of a stuffing box are normally the stationary backstop ring and the carbon slide ring which rotates with the shaft. These two rings have mutually engaging sealing surfaces. The sealing surface of the stationary backstop ring is ground in a manner to form scratches which are orientated to create a radially outward pumping effect. The flatness of the ground surface has an overall variation of less than six microns and preferably is between 2 and 5 microns. The scratches have a roughness between 0.2 and 2 microns. For scratches on the order of 1 to 2 microns the surface is phosphatized.
A backstop ring for a stuffing box or the like adapted to cooperate with a carbon sealing ring to provide sealing for dynamic and static operation, comprising, an annularly shaped member having a generally flat sealing surface, said surface having characteristic grinding marks orientated to cause fluid to be pumped in a selected radial outward direction, the flatness of said sealing surface having a deviation of less than six microns and said marks having roughness between 0.2 and 2 microns.
Claim 2
Dependent Claim
80 words
A backstop ring for a stuffing box or the like adapted to cooperate with a carbon sealing ring to provide sealing for dynamic and static operation, comprising, an annularly shaped member having a generally flat sealing surface, said surface having characteristic grinding marks orientated to cause fluid to be pumped in a selected radial outward direction, the flatness of said sealing surface having a deviation of less than six microns and said marks having roughness between 0.2 and 2 microns.
Claim 3
Dependent Claim
17 words
A backstop ring according to claim 1 wherein said flatness deviation is between 2 and 5 microns.
Claim 4
Dependent Claim
18 words
A backstop ring according to claim 2 wherein said marks have a roughness between 0.2 and 0.8 microns.
Claim 5
Dependent Claim
14 words
A backstop ring according to claim 1 wherein said surface has a phosphorous coating.
Claim 6
Dependent Claim
18 words
A backstop ring according to claim 4 wherein said marks have a roughness between 1 and 2 microns.
Claim 7
Dependent Claim
17 words
A backstop ring according to claim 4 wherein said coating has a thickness of about 2 microns.