Why do we buy insurance, again? Because, compared to the paying the total cost of repair or replacement, it’s a considerably small price to pay for peace of mind.
The same applies to chemical feed systems. The pump is the heart of the system. If it stops for any reason, the system doesn’t run properly. One low cost insurance that the pump will continue to operate is a simple relief valve.
Pressure relief valves are designed to protect pressure vessels and other equipment from being subjected to pressures that exceed their design limits. They open at a preset pressure and discharge fluid until pressure drops below set levels. Fluid is released back into the system on the low pressure side.
Neptune relief valves have a simple design that uses a self-cleaning ball check and seat. A spring guide assures proper spring loading and consistent relief capacity. The relief pressure setting can be easily changed by removing the top cap screw and locking set screw, inserting a proper Allen wrench into the opening, and adjusting the spring to the desired pressure. A good recommended setting: Operating pressure plus 10% or 50 psi whichever is greater.