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Watson
McDaniel Pilot Regulating Valves
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How are they
used
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Basic
Information
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Submittal
Download
HD
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The Watson McDaniel HD-Series
Pilot Operated Regulators were designed for extremely accurate control of
temperature and pressure in steam service applications.
The HD-Series
is made of Ductile Iron for
extended pressure and temperature ratings. These regulators use several
different control pilots, which can be attached to the valve to control
pressure, temperature, or a combination of both. The different control pilots
can be added or removed from the regulator body. This modular design adds to
the versatility of this product. The most common options include the P-Pilot for
pressure reducing, and the T-Pilot for
temperature control.
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Model: HD
Series
Body Material: Ductile Iron
Max Capacity (Full Port, 6" Size): 129,750
lbs/hr
Max Operating Pressure: 300 PSIG
Sizes: 1/2" - 6"
Connections: Threaded: (1/2” - 2”), 150# FLG (1”
- 6”), 300# FLG (1” - 6”)
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Submittal Download
PP Pilot
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The "PP" Pressure
Pilot is used with the HD Regulator to control steam pressure in
steam mains or for process equipment. Pilot operated regulators will maintain
constant downstream pressure even when the inlet pressure to the valve
fluctuates or steam usage varies.
The PP Pilot
can maintain downstream pressure to ± 1 PSIG
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Model: PP Pilot
Body & Cover Material: Ductile Iron or Cast Steel
Max Inlet Pressure: 300 PSIG
Reduced Outlet Pressure Range: 3-200 PSIG
Minimum Inlet Pressure:
15
PSIG (w/ Std Main Valve)
5
PSIG (w/ Low Pressure Main Valve)
Accuracy: ± 1 PSIG
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Submittal Download
PP5 Pilot
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The "PP5" Pressure Pilot is
used with the HD Regulator to control steam pressure in steam mains or for
process equipment. Pilot operated regulators will maintain constant
downstream pressure even when the inlet pressure to the valve fluctuates or
steam usage varies.
The P5 Pilot
can maintain downstream pressure to ± 0.5 PSIG
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Model: PP5 Pilot
Body & Cover Material: Ductile Iron or Cast Steel
Max Inlet Pressure: 300 PSIG
Reduced Outlet Pressure Range: 1-25 PSIG
Minimum Inlet Pressure:
15
PSIG (w/ Std Main Valve)
5
PSIG (w/ Low Pressure Main Valve)
Accuracy: ± 0.5 PSIG
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Submittal Download
PBP Pilot
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The “PBP” Back-Pressure Pilot used
with the HD regulator, maintains upstream pressure in steam systems. These
regulators are commonly used to supply flash steam to low pressure mains.
The PBP Pilot
can maintain downstream pressure to ± 1 PSIG
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Model: PBP Pilot
Body & Cover Material: Ductile Iron
Max Inlet Pressure: 300 PSIG
Back Pressure Range: 10-200 PSIG
Minimum Inlet Pressure:
15
PSIG (w/ Std Main Valve)
5
PSIG (w/ Low Pressure Main Valve)
Accuracy: ± 1 PSIG
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Submittal Download
PT Pilot
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The “PT” Temperature
Pilot is used with the HDregulator to control temperature in
various processes and systems. Some examples are: Oil Heaters, Ovens, Process
heaters, Vats, Dryers and Jacketed Kettles.
Note: The Low Pressure Temperature Pilot must be used in
conjunction with a low pressure main valve for applications where inlet steam
pressure isless than 15 PSIG. SPECIFY WHEN ORDERING.
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Model: PT Pilot
Body
Material: Ductile Iron / Cast Steel
Max Inlet Pressure: 300 PSIG
Temperature Control Range: 60-260 °F
Minimum Inlet Pressure:
15
PSIG (w/ Std Main Valve)
5
PSIG (w/ Low Pressure Main Valve)
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PA Pilot
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The “PA” Air Pilot is
used with the HD Regulator to control steam pressure on steam mains and
process equipment. The “PA” Air Pilot can also be used in conjunction with
the PTL or PTR pneumatic temperature controllers for controlling temperature
in process applications. The principal advantage the “PA” Air Pilot over
standard spring loaded pilots is that pressure adjustments to the regulator
can be made from a remote location. A regulator that is placed in a difficult
to reach or inaccessible location can be adjusted by a remote control panel
board placed in an accessible location.
Note: Temperature Control Range: 0-350°F when used with PTL & PTR
Pneumatic Temperature Controllers
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Model: PA Pilot
Body & Cover Material: Ductile Iron
Max Inlet Pressure: 300 PSIG
Reduced Outlet Pressure Range: 3-200 PSIG
Minimum Inlet Pressure:
15
PSIG (w/ Std Main Valve)
5
PSIG (w/ Low Pressure Main Valve)
Control Air Pressure Range: 3-125 PSIG
Accuracy: ± 1 PSIG
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Submittal Download
PTRP Pilot
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The “PTRP” Temperature Pilot is used
with the HD Regulator to control temperature in various processes and
systems. Some examples are: Oil heaters, Ovens, Process Heaters, Vats, Dryers
and Jacketed Kettles.
The "PTRP"
Pilot will control lower temperatures than the standard "PT"
Pilot.
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Model: PTRP Pilot
Body
Material: Ductile Iron / Cast Steel
Max Inlet Pressure: 300 PSIG
Temperature Control Range: 20-250 °F
Minimum Inlet Pressure:
15
PSIG (w/ Std Main Valve)
5
PSIG (w/ Low Pressure Main Valve)
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Submittal Download
Selenoid Pilot
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The Solenoid Pilot can be
used for automatic operation, remote control, programmed cycling, sequential
function interlocks with other equipment, and emergency shut-off in case of
power failure.
The Solenoid
Pilot can be used in conjunction with Pressure, Temperature, or
Air Pilots to electrically control on/off operation of the HD Regulator. When
the solenoid pilot is used, the regulator can be turned on or off by
electrically activating or de-activating the solenoid.
Normally Closed (nc) - Standard
The normally
closed Solenoid Pilot remains closed in the non-activated state. The
regulating valve will remain closed until an electrical signal is sent to the
solenoid pilot. This is known as a fail-safe condition.
Normally Open
(no) - Optional
The normally
opened Solenoid Pilot remains open in the non-activated state. The regulating
valve will function normally unless an electrical signal is used to shut-off
the solenoid pilot.
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Model: Solenoid Pilot
Body & Cover
Material: Ductile Iron
Max Inlet Pressure: 250 PSIG
Steam Inlet Pressure: 0-180 or 180-250 PSIG
NEMA Ratings:
NEMA
1 - Standard
NEMA
4 - Waterproof (Optional)
NEMA
7 - Explosion-proof (Optional)
Voltage:
110
VAC (Standard)
24
VAC (Optional)
220
VAC (Optional)
240
VAC (Optional)
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Sumbittal Download
PDP Differential Pilot
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The “PDP” Differential Pressure
Pilot is used with the HD Regulator to maintain steam pressure
at a balanced differential pressure above another media source. This is
typical on an oil burner where steam used for atomization is injected into
the oil burner at a set pressure above the incoming oil supply. Therefore, as
oil pressure fluctuates based on demand, the steam pressure will be
maintained at a differential pressure above the oil pressure.
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Model: PDP Pilot
Body & Cover
Material: Ductile Iron / Cast Steel
Max Inlet Pressure: 300 PSIG
Reduced Outlet Pressure Range: 3-200 PSIG
Minimum Inlet Pressure:
15
PSIG (w/ Std Main Valve)
5
PSIG (w/ Low Pressure Main Valve)
Accuracy: ± 2
PSIG
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