Packing assembly

Claim 2

A packing assembly in a plunger pump for sealing the annular space between plunger and pump body which comprises: a first packing mounted in a forward interval of said annular space; a second packing mounted in a rear interval of said annular space; a lubricating ring mounted in said annular space between said packings, said first and second packing and said lubricating ring being subject to hydraulic pumping pressure; and means for preventing the forward extrusion of said second packing past said lubricating ring, said means including lip members extending rearwardly from said lubricating ring for sealing the clearance gaps between said lubricating ring and the pump body and between the lubricating ring and plunger.

Claim 3

A packing assembly as defined in claim 1 wherein said first and second packings include a plurality of lip-type seal rings, each of said lip-type seal rings being positioned within said annular space with its seal lips extending forwardly therein; and wherein said means for preventing the extrusion of said second packing further includes a lip-type seal ring positioned in mated relation with said rearwardly extending members.

Claim 4

A packing assembly as defined in claim 2 wherein said lip-type seal rings are V-rings.

Claim 5

A packing assembly as defined in claim 1 wherein said means for preventing the extrusion of said second packing includes a ring of deformable material arranged in mated relation with said rearwardly extending members to cause said members to deflect outwardly into contact with said cylindrical surfaces under hydraulic loading.

Claim 6

A packing assembly as defined in claim 1 wherein said packing assembly further includes a spring positioned within said annular space for maintaining said seal rings under compression.

Claim 7

A packing assembly for seAling the annular space between a pump plunger and pump body, which comprises: a first set of packing rings mounted in a forward section of said annular space; a second set of packing rings mounted in a rear section of said annular space; a lantern ring composed of material harder than said packing rings mounted in said annular space to the rear of said first set of packing rings, said packing rings and said lantern ring being subjected to hydraulic pump pressure, said lantern ring having a rearwardly opening groove formed therein which is defined in part by a pair of outwardly tapering lips, said lips being adapted to substantially seal the clearance gap between said lantern ring and said plunger and between said lantern ring and said pump body a backup ring positioned between said lantern rings and said rear set of packing rings.

Claim 8

A packing assembly for seAling the annular space between a pump plunger and pump body, which comprises: a first set of packing rings mounted in a forward section of said annular space; a second set of packing rings mounted in a rear section of said annular space; a lantern ring composed of material harder than said packing rings mounted in said annular space to the rear of said first set of packing rings, said packing rings and said lantern ring being subjected to hydraulic pump pressure, said lantern ring having a rearwardly opening groove formed therein which is defined in part by a pair of outwardly tapering lips, said lips being adapted to substantially seal the clearance gap between said lantern ring and said plunger and between said lantern ring and said pump body a backup ring positioned between said lantern rings and said rear set of packing rings.

Claim 9

A packing assembly as defined in claim 6 wherein said packing rings are lip-type seal rings.

Claim 10

A packing assembly in a plunger pump for sealing the annular space between the plunger and the pump body which comprises: a front set of elastomeric lip-type seal rings mounted in said annular space; a rear set of elastomeric lip-type seal rings mounted in said annular space; a lantern ring mounted in said annular space between said front and rear sets of seal rings, said rings and lantern ring being subjected to hydraulic pressure; and means interposed between said lantern ring and said rear set of seal rings for preventing the forward extrusion of said rear seal rings, said means including a pair of outwardly diverging and rearwardly extending lips formed in a rear edge portion of said lantern ring, and a backup ring having a forward surface adapted to mate with the rear edge of said lantern ring.

Claim 11

A packing assembly in a plunger pump for sealing the annular space between the plunger and the pump body which comprises: a front set of elastomeric lip-type seal rings mounted in said annular space; a rear set of elastomeric lip-type seal rings mounted in said annular space; a lantern ring mounted in said annular space between said front and rear sets of seal rings, said rings and lantern ring being subjected to hydraulic pressure; and means interposed between said lantern ring and said rear set of seal rings for preventing the forward extrusion of said rear seal rings, said means including a pair of outwardly diverging and rearwardly extending lips formed in a rear edge portion of said lantern ring, and a backup ring having a forward surface adapted to mate with the rear edge of said lantern ring.

Claim 12

A packing assembly as defined in claim 8 wherein said backup ring is an elastomeric lip-type seal ring, and wherein the assembly further comprises an adapter interposed between said backup ring and said rear set of seal rings.