Home Paintguns Mechanical Breaking down two Sovereign LPRs (Low Pressure Regulators)

Breaking down two Sovereign LPRs (Low Pressure Regulators)

Sovereign 1 and 2 LPRs.
Top Sovereign II low pressure regulator (?) and bottom Sovereign 1 lpr broken down.

The week before last I broke down a couple Proline Sovereign Low Pressure Regulators that I was mailing out to see what kind of seals they take.  Their function is very similar to a Palmer’s Rock Regulator, likely because of Glenn Palmer’s involvement in the predecessor to the Sovereign, the Sterling Auto Rocker.

Early Palmer’s Rock regulators use a cup seal in the rear of the valve that is adjusted to regulate air flow by the pistol.  Standard Rock regulators (94? to modern) use a seal and a thin brass pin that is depressed by a pistol.

Close up on the internals from the Sovereign LPR.
Close up on the internals from the Sovereign LPR.

The Sovereign lpr uses a Schrader valve. The Schrader valve is easy to locate rebuilds for but I’m not sure how it fairs in the long run. Scrader valves are commonly found in bicycle tires and car tires and typically seal 30-50 psi. I don’t know how they hold up to a back end pressure of 350 psi? Mac Dev Sonic LPRs use a Schrader valve so they must hold up decently.

Sovereign LPRs.
Top is an assembled Sovereign 2 LPR and bottom is a Sovereign 1 LPR.

I didn’t notice any pressure relief vents on these Sovereign Lprs and since they were manufactured across the Atlantic the threads are likely metric.  The back male to male nipple that connects the lpr to front of the Sovereign isn’t standard 1/8th npt.

Sovereign 1 low pressure regulator plunger.
Plunger on a Sovereign 1 LPR. This example has seen corrosion but could be cleaned up.

A closer view of the plunger on the Sovereign 1 LPR.  This LPR uses two orings instead of the one fat ORing found on a Palmer’s Rock Regulator.

Interior of Sovereign LPRs.
Left is the Sovereign 1 lpr. Right is the Sovereign 2 lpr. View is from the front looking back into the body of the Low Pressure Regulator. Schrader valves are screwed into the center and the Sovereign 2 reg on the right has brass removed from around the center where the Schrader valve is. This couple give the reg some extra volume.

The Schrader valve is visible inside the Sovereign LPRs.

Sovereign lprs back end , rear view.
View of the back side that take a screw in nipple of the Sovereign LRPs. Left is the Sovereign 1 lpr and the right is possible a sovereign 2 lpr.

From the back looking forward you can see the front (HP) side of the Schrader valve.

Sovereign front end parts list crop
Sovereign front end parts diagram crop from user manual.

Above is a cropped scan from the Sovereign user manual that shows the front end LPR.  I’ll be eventually posting the entire scan and the actual manual is available here:

And the parts list to go along with the above scan:


Parts list to go with cropped front end scan of the sovereign.
Parts list to go with cropped front end scan of the sovereign.

Find more sovereign parts on baccipaintball at:

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