CPC F04B 53/00 (2013.01) [F04B 53/16 (2013.01); F04B 53/18 (2013.01); F16J 9/20 (2013.01)] | 20 Claims |
1. A packing arrangement for a fluid end of a reciprocating pump, the packing arrangement being installable within a packing box disposed at the fluid end and being arranged to form a seal with a plunger of the reciprocating pump, the packing arrangement comprising:
one or more pressure rings; and
a scraper ring assembly disposed upstream of the one or more pressure rings, the scraper ring assembly comprising two or more rings, the two or more rings including:
a first ring formed from a resilient material configured to form the seal against the plunger, the first ring including an upstream face and an inner surface, wherein the upstream face and the inner surface cooperatively form a sharp leading edge of the first ring; and
a second ring defining a camming surface configured to engage the upstream face of the first ring and urge the inner surface of the first ring inwards during compression of the first ring and the second ring against one another,
wherein the sharp leading edge of the first ring is configured to be positioned inwardly beyond the second ring.
|