DOROT 68-510

DOROT 68-510, is a Diaphragm-actuated, 2-way Spring-loaded, Pressure-sustaining Metal Pilot Valve, designed for control of hydraulic valves. The pilot valve modulates to keep a steady, preset pressure upstream of the valve.
Operation principle
As upstream pressure rises above the preset point, the pilot valve opens a water passage between its "COM" and "OUT" ports. This allows water in the main valve control chamber for venting to the downstream; causing the main valve to open. As the upstream pressure falls below the preset point, the pilot valve throttles the internal passage; restricting flow out from the main valve control chamber; enabling the valve to maintain position or close (if necessary).