Abstract: This disclosure includes packing stacks for pumps, pumps having the same, and related methods. Some packing stacks include male and female adapter rings and one or more V-rings, each including a concave surface and an opposing convex surface and configured to be disposed between the male and female adapter rings with the concave surface facing the former and the convex surface facing the latter. In some packing stacks, the male adapter ring includes a body and a ridge projecting from the body, the ridge configured to overlie a central area of the concave surface of the V-ring that is closest to the male adapter ring and less than 40% of the concave surface. In some packing stacks, the male adapter ring has a non-cylindrical interior passageway configured to facilitate fluid flow past the male adapter ring when a plunger is disposed therethrough.

Abstract: This disclosure includes plunger pumps having leak detection systems. Some pumps include a housing having a bore, an inlet, and an outlet, a plunger disposed within the bore and a first seal engaged with the plunger to divide the bore into first and second chambers, the plunger configured to reciprocate within the bore to expel liquid from the first chamber out of the outlet, and a sensor for detecting a presence of liquid in at least a portion of the second chamber. Some pumps have a reservoir for collecting liquid that leaks into the at least a portion of the second chamber, where the sensor is for detecting a liquid level in the reservoir. Some pumps include a second seal engaged with the plunger to divide the second chamber into first and second portions, and the sensor is for detecting a presence of liquid in the second portion.