Pump assemblies with sealing

Abstract

A pump casing assembly has a first body part, a second body part and a seal disposed between the first and second body parts. The first body part has a first face that defines a recess to receive the seal and the second body part has a first face disposed opposite the first face of the first body part and defining a first sealing surface engaged by the seal and a projection extending beyond the first sealing surface into the recess.

1 . A pump casing assembly comprising a first body part, a second body part and a seal disposed between said first and second body parts, said first body part having a first face that defines a recess to receive said seal and said second body part having a first face disposed opposite said first face of said first body part and defining a first sealing surface engaged by said seal and a projection extending beyond the first sealing surface into said recess. 
     
     
         2 . The pump casing assembly as claimed in  claim 1 , wherein said first sealing surface is a planar surface. 
     
     
         3 . The pump casing assembly as claimed in  claim 1 , wherein said recess defines a second sealing surface disposed opposite said first sealing surface and engaged by said seal and a register surface extending transverse to said second sealing surface and said projection defines a register face that engages said register surface to locate said second body part relative to said first body part. 
     
     
         4 . The pump casing assembly as claimed in  claim 3 , wherein said first body part defines a hollow interior having a first longitudinal axis, said second body part defines a hollow interior defining a second longitudinal axis and said register face and register surface are configured to locate said second body part relative to said first body part such that said first and second longitudinal axes are aligned. 
     
     
         5 . The pump casing assembly as claimed in  claim 3 , wherein said register surface and said register face each extend perpendicular to said second sealing surface. 
     
     
         6 . The pump casing assembly as claimed in  claim 3 ,
 wherein at least one of said register surface and said register face comprises an annular surface.   
     
     
         7 . The pump casing assembly as claimed in  claim 1 , wherein said projection has a tip and a side face adjoining said first sealing surface and extending to said tip, said side face being configured such that in cross section said projection tapers so as to have a first thickness adjacent said first sealing surface and a second thickness at said tip that is less than said first thickness. 
     
     
         8 . The pump casing assembly as claimed in  claim 7 , wherein said side face comprises an arcuate profile. 
     
     
         9 . The pump casing assembly as claimed in  claim 1 , wherein:
 said first body part comprises an annular wall having a first end that defines said first face of said first body part, a second end disposed opposite said first end and a length defined by said first and second ends,   said second body part comprises an annular wall having a first end that defines said first face of said second body part, a second end disposed opposite said first end and a length defined by said first and second ends,   said first and second body parts have a lengthways direction from said second end of said first body part to said second end of second body part,
 said seal has a height in said lengthways direction, and 
 said projection has a height in said lengthways direction that is less than said height of said seal, and 
   said seal and projection are disposed side by side.   
     
     
         10 . The pump casing assembly as claimed in  claim 1  wherein said projection surrounds said first sealing surface. 
     
     
         11 . The pump casing assembly as claimed in  claim 1 , wherein said first sealing surface is an annular surface and said projection extends around a circumference of said annular surface. 
     
     
         12 . The pump casing assembly as claimed in  claim 1 , comprising a plurality of said projections disposed in spaced apart relation about said first sealing surface. 
     
     
         13 . (canceled)