Modular pump cylinder-head having integral over-pressure protect

Details Modular pump cylinder-head having integral over-pressure protect Modular pump cylinder-head having integral over-pressure protect

1993-05-10

1994-11-08

Bertsch, Richard A.

Pumps

Expansible chamber type

Having valve parts relatively moved for nonvalving function

417454, 417569, 137542, F04B 2100

Patent

active

053622154

ABSTRACT:
A modular fluid end assembly, and associated method of providing same, for a reciprocating pump having a cylinder housing secured to a crankcase by tie bolts. The fluid end is tolerant to having cylinder-head bolts improperly torqued while also providing an over pressure relief feature. The modular fluid end includes a cylinder-head having two seal landings, one common to a cylinder base joint surface and one common to an end joint surface. The base joint seal landing is smaller than the end joint seal landing. An end plate and a co-acting valve cover is provided. The valve cover includes a seal extending thereabout and is accommodated by the seal landing of the end joint. A second seal is accommodated by the base joint seal landing. A plurality of cylinder-head bolts having predetermined yield strengths, are located in proximity to the periphery of the end plate to force the end plate and the valve cover against the cylinder-head. Upon an over-pressure condition, the bolts yield thereby allowing the end plate to move away from the cylinder-head and the larger end joint seal ruptures prior to the base joint seal, thereby allowing the fluid or slurry being pumped to flow between the end plate and the cylinder-head thereby preventing damage to the more difficult to repair cylinder housing, while protecting expensive power-end components from being damaged by the overload condition.

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