Piloted regulators - Advantages,Disadvantages and Application


Piloted regulators
Before reading it would be better to understand about Pressure regulators

Set point determined by pilot (a direct acting regulator) that control the flow to or from the diaphragm of a larger valve
May have minimum differential pressure requirement .
Larger line sizes for higher flows
Very accurate
Higher turndown ratios
Requires minimum differential pressure and downstream sensing tap

Advantages of Piloted Regulators

More accurate
Less drop
More sensitive - Small change in pilot = large change in main valve
Higher range ability

Disadvantages of piloted regulators

More sensitive - Can create oscillations with in a system
Not good for rapidly changing system
Requires minimum pressure drop to operate (typically 15-25 psi)

Hydraulic Servo valves - basic types and operation