Pump assembly including fluid cylinder and tapered valve seats

A valve seat adapted to be disposed within a fluid cylinder of a pump assembly, the valve seat comprising:

• a seat body defining an axis, the seat body comprising an enlarged-diameter portion defining a tapered external shoulder extending at a first acute angle from the axis and a tapered surface extending at a second acute angle from the axis;
• wherein the tapered external shoulder is adapted to engage the fluid cylinder of the pump assembly;
• and
• wherein the first and second acute angles are measured from the axis in a same angular direction, the first acute angle being less than the second acute angle;
• and
• a bore extending through the seat body along the axis;
• wherein the tapered surface is adapted to be reciprocably engaged by a valve member of the pump assembly.