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.
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.
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.
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.
The Schrader valve is visible inside the Sovereign LPRs.
From the back looking forward you can see the front (HP) side of the Schrader valve.
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:
Find more sovereign parts on baccipaintball at: