Multi-point seal lubrication system

1. A spray system comprising:

a fluid source;

a fluid destination;

a pump cylinder disposed fluidly between the fluid source and the fluid destination;

a plunger situated within the pump cylinder and positioned by a displacement rod;

a pump motor configured to drive the displacement rod to reciprocate the plunger within the pump cylinder;

first and second inlet valves situated along fluid lines from the fluid source to the pump cylinder;

first and second outlet valves situated along fluid lines from the cylinder to a sprayer;

valve seals disposed about the each of the first and second inlet and outlet valves;

a seal lubricant reservoir for lubricant fluid;

gravity-fed valve seal lubricant lines disposed to carry the lubricant fluid to each of the valve seals;

a first cylinder bearing situated at a first axial extent of the pump cylinder, adjacent to the motor, to carry the displacement rod;

a second cylinder bearing situated at a second axial extent of the pump cylinder, opposite the motor, to carry the displacement rod;

first and second bearing seal assemblies respectively disposed about the first and second cylinder bearings;

first and second gravity-fed bearing seal lubricant lines disposed to carry the lubricant fluid to the first and second bearing seal assemblies, respectively; and

a rod reservoir situated at the second bearing seal assembly, and sized and positioned to receive the displacement rod during a maximum extension of the displacement rod from the motor; wherein the second gravity-fed bearing seal lubricant line is disposed to flood the rod reservoir with lubricant.

2. The spray system of claim 1 , wherein the lubricant fluid is a mixture of solvent and plasticizer.

3. The spray system of claim 1 , wherein the lubricant fluid is non-hygroscopic oil.

4. The spray system of claim 1 , wherein the inlet valves or the outlet valves are pin valves.

5. The spray system of claim 1 , wherein the inlet valves or the outlet valves are gate valves.

6. The spray system of claim 1 , further comprising a reservoir mount disposed to retain the seal lubricant reservoir at an elevated position relative to the pump cylinder.

7. A lubricated pumping system comprising:

a metering cylinder;

a plunger situated on a displacement rod within the metering cylinder;

a motor attached to the displacement rod to reciprocate the plunger, and anchored to a first axial end of the metering cylinder;

a rod reservoir situated at an a second axial end of the metering cylinder opposite the first axial end of the metering cylinder, and sized to accept the displacement rod;

a first displacement rod bearing disposed against the displacement rod, between the metering cylinder and the motor;

a second displacement rod bearing disposed against the displacement rod, between the metering cylinder and the rod reservoir;

first and second inlet valves situated along fluid paths from a pumping fluid source to the metering cylinder;

first and second outlet valves situated along fluid paths from the metering cylinder to a pumping fluid destination;

a plurality of lubricated seal assemblies disposed about each of the first and second inlet valves, the first and second outlet valves, and the first and second displacement rod bearings; and

a lubricant reservoir situated at an elevated position relative to the metering cylinder, and fluidly connected to the lubricated seals;

wherein at least one of the plurality of lubricated seal assemblies comprises a throat seal; and

wherein one of the plurality of lubricated seal assemblies opens into the rod reservoir to flood the rod reservoir with lubricant.

8. The lubricated pumping system of claim 7 , wherein the throat seal comprises a seal ring disposed about a valve or bearing member, and wherein lubricant fluid from the lubricant reservoir floods a space adjacent the throat seal.

9. The lubricated pumping system of claim 7 , wherein the lubricant reservoir is connected to the throat seal via a substantially vertically-oriented fluid line.

10. The lubricated pumping system of claim 7 , wherein the lubricant is non-hygroscopic oil.