Scraper ring

A packing arrangement for a fluid end of a reciprocating pump, the reciprocating pump comprising a pumping chamber, 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 plunger being configured to move relative to the pumping chamber to draw low pressure fluid into the pumping chamber and discharge high pressure fluid from the pumping chamber, the packing box comprising a high pressure end facing the pumping chamber of the reciprocating pump, and the packing arrangement comprising:

• a junk ring disposed at the high pressure end of the packing box, the junk ring defining a planar downstream surface facing away from the pumping chamber of the reciprocating pump;
• one or more pressure rings disposed downstream of the junk ring away from the pumping chamber;
• and
• a scraper ring disposed between the junk ring and the one or more pressure rings, the scraper ring including:
• a planar upstream face configured to abut the planar downstream surface of the junk ring, the planar upstream face facing toward the pumping chamber of the reciprocating pump;
• and
• an inner surface with a tapered section that tapers away from the plunger along a downstream direction away from the pumping chamber so that the scraper ring is widest at the planar upstream face.