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The PP-Pressure Pilot is adequate for conrolling pressure in most industrial aplicatons. For increased accuracy use the PP5 Pilot.

PP-Pressure Pilot (Standard) 1.0 PSIG accuracy
PP5-Pressure Pilot (High Accuracy) 0.5 PSIG accuracy
PSIG Accuracy
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PP Series Pressure Pilots

PP & PP5 Pilots

The PP & PP5 Pressure Pilots are used with the HD Regulator to control steam pressure in steam mains or for process equipment. Pilot-operated regulators maintain constant downstream pressure even when the inlet pressure to the valve fluctuates or steam usage varies. The PP-Pressure Pilot is adequate for controlling pressure in most industrial applications. For increased accuracy use the PP5 Pilot.

Features
  • The PP-Pilot can maintain downstream pressure to ±1 PSIG
  • PP5-Pilot can maintain downstream pressure to ±0.5 PSIG
  • Choices of three overlapping pressure ranges
  • Pilot is easily installed on pilot adapter using four bolts, no tubing connections are required
  • Full port strainer and blowdown valve on pilot adapter for protection of pilot from dirt and scale
  • Solid floating diaphragm is more failure resistant
  • Watson McDaniel's pilots can be used with other manufacturers’ regulators


Options
  • Pressure pilot can be used with temperature pilot to eliminate the need for two separate regulators
  • Solenoid pilot can be added for remote on/off control of regulator

Controlling Pressure

The PP and PP5 Pilots are both spring-adjusted pressure pilots. The PP-Pilot is used on typical general purpose pressure reducing applications. The PP5-Pilot is used when higher accuracy is required and is capable of maintaining a control pressure window of less than 1 PSI.



How PP Pressure Pilots Work

Controlling Pressure

The PP and PP5 Pilots are both spring-adjusted pressure pilots. The PP-Pilot is used on typical general purpose pressure reducing applications. The PP5-Pilot is used when higher accuracy is required and is capable of maintaining a control pressure window of less than 1 PSI.



Pilot Operation

The Pressure Pilot controls the operation of the HD Regulator. The sensing line connects the pressure pilot to the downstream side of the regulator. Pressure in the sensing line applies an upward force to the pilot diaphragm to compress the adjustment spring. When system pressure equals set point, the diaphragm moves upwards against the force of the adjusting spring, closing pilot valve. When the pilot valve is shut, steam cannot pass thru to the underside of the regulator diaphragm, closing the regulator. When the steam pressure falls below its set point, the pilot valve opens allowing steam to lift the main valve diaphragm which opens up the regulating valve.

PP Series Pressure Pilots

A Pressure Pilot is used with the HD Regulator to control steam pressure in steam mains or for process equipment. The PP-Pressure Pilot (1.0 PSIG accuracy) is adequate for controlling pressure in most industrial applications. For increased accuracy use PP-5 Pilot. (0.5 PSIG accuracy)

ModelPSIG AccuracyReduced Pressure RangeSpring ColorWeight (lbs)
PP-YStandard3 - 25Yellow10
PP-BStandard20 - 100Blue10
PP-RStandard80 - 200Red10
PP5-YHigh Accuracy1 - 10Yellow25
PP5-BHigh Accuracy10 - 25Blue25
Downloads
Catalog Spec Sheet (pdf)
I&M (pdf)
I&M (pdf) - Quick Install
Product Overview
The PP & PP5 Pressure Pilots are used with the HD Regulator to control steam pressure in steam mains or for process equipment. Pilot-operated regulators maintain constant downstream pressure even when the inlet pressure to the valve fluctuates or steam usage varies. The PP-Pressure Pilot is adequate for controlling pressure in most industrial applications. For increased accuracy use the PP5 Pilot.

PP-Pressure Pilot (Standard) 1.0 PSIG accuracy
PP5-Pressure Pilot (Special Applications) 0.5 PSIG accuracy
Features
• The PP-Pilot can maintain downstream pressure to ±1 PSIG
• PP5-Pilot can maintain downstream pressure to ±0.5 PSIG
• Choices of three overlapping pressure ranges
• Pilot is easily installed on pilot adapter using four bolts, no tubing connections are required
• Full port strainer and blowdown valve on pilot adapter for protection of pilot from dirt and scale
• Solid floating diaphragm is more failure resistant
• Watson McDaniel's pilots can be used with other manufacturers’ regulators
How It Works
The Pressure Pilot controls the operation of the HD Regulator. The sensing line connects the pressure pilot to the  downstream side of the regulator. Pressure in the sensing line applies an upward force to the pilot diaphragm to compress the adjustment spring. When system pressure equals set point, the diaphragm moves upwards against the force of the adjusting spring, closing pilot valve. When the pilot valve is shut, steam cannot pass thru to the underside of the regulator diaphragm, closing the regulator. When the steam pressure falls below its set point, the pilot valve opens allowing steam to lift the main valve diaphragm which opens up the regulating valve.
Dimension and Weights

Options
• Pressure pilot can be used with temperature pilot to eliminate the need for two separate regulators
• Solenoid pilot can be added for remote on/off control of regulator