Replacement Hinge Bars
MHV manufactures replacement hinge-bars (Stokes), slide-pins (Kinney), and spacers for mechanical pumps, in a range of sizes.
Standard-sized parts are available, as well as sizes to compensate for ground piston-slide tangs and oversized hinge bar bores.
MHV's hinge bars for Stokes pumps are made from 4140 chrome-moly steel, heat treated to 28-32 Rc hardness. MHV's slide pins for Kinney pumps are made from Class 40 grey iron, as are the OEM parts.
Hinge Bar Bores
When the hinge bar bore in your rotary piston pump becomes scored, MHV can line-bore the block to restore the proper surface finish (63 rms, or better). Taper is held to .001" or less.
Also, MHV's special fixturing eliminates chatter and keeps the bore in the factory location. New hinge bars (Stokes) or slide-pins (Kinney) are supplied to fit the new larger bore.
Replacement Main Block for Stokes 412H11
MHV manufactures replacement main blocks for Stokes 412H11 pumps. In corrosive processes, the main block eventually is so corroded that it needs replacement.
Also, after many rebuilds, hinge bar bores may be so large that the volumetric efficiency will be reduced by improper discharge channel location. This occurs when the hinge bar bore nears .750" over standard.
The water passages are tested hydrostatically, at 50 psi.