Pressure Regulators

Pressure Regulators and Control Valves from Atlantic Valve & Supply

Pilot-Operated Regulators

1. Pilot-Operated Regulators are more accurate and offer higher capacities than standard direct-operated regulators. They will maintain constant set outlet pressure even when inlet pressure fluctuates or variations in flow occur. With the proper selection of pilots, these regulators will accurately control temperature, pressure or a combination of both.
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• HD Series

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.

1. • Sizes: 1/2" - 6"
2. • Connections: Threaded: (1/2" - 2"), 150# FLG (1" - 6"), 300# FLG (1" - 6")
3. • Body Material: Ductile Iron
4. • Max Capacity (Full Port, 6" Size): 129,750 lbs/hr
5. • Max Operating Pressure: 300 PSIG
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Pilots for HD Series Regulators

1. • PP Pilot
2. 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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1. • PP5 Pilot

1. 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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1. • PBP Pilot
2. 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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1. • PT Pilot
2. The "PT" 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. Note: The Low Pressure Temperature Pilot must be used in conjunction with a low pressure main valve for applications where inlet steam pressure is less than 15 PSIG. SPECIFY WHEN ORDERING.
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1. • PA Pilot
2. 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.
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1. • PTRP Pilot
2. 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.
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1. • Solenoid Pilot
2. 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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1. • PDP Pilot
2. 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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Direct-Operated Regulators

1. Direct-Operated Regulators are used for controlling pressure and temperature in a variety of applications.

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3. • O Series
4. The "O" Series Pressure Regulating Valves are used for reducing pressure in steam, air and water systems. Commonly used in heating and other process applications.
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1. • B Series
2. The B Series Pressure Regulating Valves are used for reducing pressure in air and water systems. These regulators are commonly found in industrial plants, apartment buildings, water supply systems, schools and underground water distribution systems.

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1. • 455 Series
2. The 455 Series are Balanced, Externally-Sensed Pressure Regulating Valves that are used for reducing pressure in steam, air and water systems. Commonly used in heating and other process applications. Externally-sensed regulators are often more accurate than internally-sensed regulators because the sensing line is connected close to the process it is intending to control and is far enough away from the outlet of the regulator to not be affected by turbulence.
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1. • 403 Series
2. The 403 Series Internally Pilot-Operated Pressure Regulating Valves are used for pressure reduction on steam mains and other process equipment. Pilot-operated regulators will maintain a constant and accurate downstream pressure regardless of fluctuations in supply pressure or usage. These regulators can be supplied with an internal sensing option eliminating the external sensing line.
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Control Valves

1. A Control Valve is a device capable of modulating flow at varying degrees between minimal flow and full capacity in response to a signal from an external control device. In a process control loop, an Electronic Controller and Sensor is used in conjunction with a Control Valve to maintain a process variable at a desired set point. The controller compares the sensor signal to the set point and outputs the appropriate response signal to the control valve. The control valve will then modulate to provide the flow response required to maintain the process variable at the set point. In the case of a pneumatic control valve such as the W910 Series, a current-to-pressure (I/P) transducer is required to convert the electrical signal from the controller to the air pressure signal needed to operate the pneumatic valve. Watson McDaniel is unique in its ability to provide all the necessary components to create a complete control loop.
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3. • W910TB Series
4. The W910TB Pneumatic Control Valve is used for On/Off control applications, providing a quick-opening flow response when used with single or double seated valves.
   Typical Applications:
   - Single seated valve for heating with steam
   - Single seated valve for cooling with water
   - Single seated valve for heating with water
   - Double seated valve for heating with steam
   - Double seated valve for cooling with water
   - Double seated valve for heating with water

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1. • HB Series
2. The HB Series Pneumatic Control Valve with Pneumatic Actuator is a high performance, general service control valve designed using Computational Fluid Dynamics(CFD) for high control acuracy, optimzed flow characteristics and extended service life. These control valves, with stainless steel bodies are equipped with a contoured plug design to withstand the rigorous nature of steam service and are compatible with many fluids and environments.
   Typical Applications:
   - These Control Valves feature all 316 Stainless Steel bodies and trim for use with Steam, Water, Glycol and other chemically compatible fluids
   - Double seated valve for heating with water
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Download Literature

• Watson McDaniel Full Line Catalog
• Pilot Operated Pressure Regulators
• Direct Operated Pressure Regulators
• Typical Regulator and Pilot Combinations