Fundamental Principles of Pilot Operated Regulators

This paper describes the fundamental function of pilot operated regulator. A pressure-reducing regulator must supply a quantity of flow that matches a downstream, usage, demand.  If the required flow rate is small, the regulator plug or disk should approach its seat and restrict the flow. If the demand increases, the plug or disk should move away to create a larger opening. Ideally, a regulator should provide a constant downstream pressure while delivering the required flow. Therefore, regulators automatically adjust the flow rate to meet the downstream demand.

Author: Danfoss