Patent ID: 6126171
Filing Date: 2000-10-03
Classification: F04B

Abstract:
In a plunger pump of the type including a crankcase member, a head member affixed to the crankcase member, the crankcase member including a guide segment defining a first longitudinal bore and said head member including a second longitudinal bore, coaxial with the first longitudinal bore of the crankcase member, a piston plunger disposed in the first and second longitudinal bores and coupled by a connecting rod to a rotatable crank for reciprocating motion in the first and second longitudinal bores, an improved sealing cartridge assembly, comprising:(a) an upper tubular cartridge member removably contained within the second longitudinal bore, there being an annular cavity in a base portion of the upper tubular cartridge member for containing an annular low pressure seal therein for cooperating with the piston plunger;(b) a lower tubular cartridge member removably contained within the first longitudinal bore, the lower tubular cartridge having a counter bore in opposed ends thereof;(c) retainer means disposed in the counter bore in one of the opposed ends for retaining an annular vacuum seal member therein concentric with the piston plunger; and(d) an annular oil seal disposed in the counter bore in the other end of the lower cartridge member in surrounding relation to the piston plunger.