PP Series Pressure Pilots for HD Regulators

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.

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

Catalog Specification Sheet

I&M

I&M – Quick Install

Model	PSIG Accuracy	Reduced Pressure Range	Spring Color	Weight (lbs)
PP-Y	Standard	3 - 25	Yellow	10
PP-B	Standard	20 - 100	Blue	10
PP-R	Standard	80 - 200	Red	10
PP5-Y	High Accuracy	1 - 10	Yellow	25
PP5-B	High Accuracy	10 - 25	Blue	25

Description

The PP Series Pressure Pilots for HD Regulators are used with the HD Regulator to control steam pressure in steam mains or for process equipment.

PP-Pressure Pilot (Standard) 1.0 PSIG accuracy
PP5-Pressure Pilot (Special Applications) 0.5 PSIG accuracy

How PP Series Pressure Pilots for HD Regulators work:

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. This compresses the adjustment spring.
When system pressure equals set point, the diaphragm moves upwards against the force of the adjusting spring. This closes the 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.

Application Data Sheet – Fill Out and Return for Accurate Quote

Steam Pressure Reducing Valve Application Data Sheet