Brochure

118
Selection Guides
Hoffman Specialty
®
Selection Guidelines
Pressure and/or Temperature Pilot Operated Steam Regulators (continued)
A complete Series 2000 Regulator consists of:
– Main valve
– Control pilot or combination of pilots
– Hardware kit
There are a number of types of pilot control valves
available:
• Series SPS Spring Pressure Control Pilots –
for self-contained pressure regulation.
• Series AP Air Pressure Control Pilots – for remote
pressure control using air pressure (requires an air
pressure signal).
• Series STPA Self-Contained Temperature Control
Pilots – for direct control of temperature in heated fluids.
• Series 315 PNT and Series 240 PNT Pneumatic
Temperature Control Pilots – for rapidly changing
load requirement applications (requires an air pressure
signal and an AP Air pressure Control Pilot).
• Series SLD Solenoid Pilots – for remote control or
safety overrides.
Different types of pilot valves can be used in combination
to control more than one function or as a safety override.
For example, a temperature pilot may be used in
conjunction with a spring pressure pilot to control both
temperature and pressure. Or, a temperature pilot may be
used with a solenoid pilot to provide automatic shutdown
when an over-temperature condition occurs.
How to Select Series 2000 Pilots
Series SPS Spring Pressure Control Pilots
– for self-contained pressure regulation.
1. Determine the reduced steam outlet pressure to be
maintained downstream of main valve.
2. Use the Spring Pilot Ordering Information Chart to:
a) Select a model number (based on the outlet
pressure determined above).
b) Determine the part number (based on the model
number).
Series AP Air Pressure Control Pilots – for remote
pressure control using air pressure (Air PRV Regulator is
also required)
1. Determine the reduced steam outlet pressure to be
maintained downstream of main valve.
2. Determine the air loading pressure available from the
Air PRV or Pneumatic Temperature Pilot.
3. Use the Air Loading Data Graph to select a model
number that meets the requirements of the outlet steam
pressure and available air loading pressure as
determined above.
4. Use the Air Pilot Ordering Information Chart to
determine the part number (based on the model
number).
5. Use the Air PRV Regulator Ordering Information Chart
to determine the part number.
Series STPA Self-Contained Temperature Control
Pilots – for direct control of temperature in heated fluids.
1. Determine the process temperature of the fluid whose
temperature is being controlled.
2. Determine the length of capillary tube required between
the main valve and the temperature monitoring point.
3. Use the Self-Contained Temperature Pilot Ordering
Information Chart to:
(a) Select a model number (based on the temperature
range and capillary range as determined above).
(b) Determine the part number (based on the model
number).
4. (Optional) Use the Well Ordering Information Chart to:
(a) Select a model number (based on desired bulb
material).
(b) Determine the part number (based on the model
number).
Series 2000