Brochure
115
Selection Guides
Hoffman Specialty
®
Selection Guidelines
Selecting the proper Series 2000 Pilot-Operated Regulator
provides accuracy and efficiency in the control and
operation of steam systems and their components. Series
2000 Regulator main valves are controlled by pilot valves.
Pilot valves of different types can be used individually or in
combination to:
– Control downstream steam pressure
– Control process temperature
– Control both downstream pressure and process
temperatures in system components
– Provide a safety override.
A complete Series 2000 Regulator consists of:
– Main valve
– Control pilot or combination of pilots
– Hardware kit
Main Valve Sizing
1. Determine the available steam inlet pressure.
2. Determine the reduced steam outlet pressure.
3. Determine the capacity required by referring to the
manufacturer’s specifications for your equipment.
4. Apply the specifications (as determined in steps 1-3) to
the Full Port Steam Capacity Table to determine the
main valve size. If steam inlet pressure is below 30 psig
(2.1 bar) use the Low Pressure Steam Capacity Table
for Models 2150 or 2250 Main Valves.
Guidelines:
– To prevent seat damage and maintain control and
accuracy, do not oversize the main valve. Select a
regulator main valve that will operate between 50 - 100%
of its capacity rating. If necessary, use Normal or
Reduced Port Steam Capacity Tables.
–
A Normal or Reduced Port Main Valve is recommended
for systems that will expand in the future.
– The maximum recommended pressure drop across a
single valve is 100 psig (6.9 bar). Operating with
more than a 100 psig (6.9 bar) pressure drop may
cause wire draw in the seat and excessive noise.
–
Although not recommended, a Series 2000 Main Valve
may be used for pressure drops up to 150 psi (10.4 bar).
– Main Valve noise data is available through "Steam
Specialty Component Selectors" on the Hoffman
Specialty website, ESP-Plus or upon request.
– To prevent excessive relief valve popping, the relief
valve set point pressure must be capable of being set
as follows:
5. Use the Main Valve Body Style Chart to select a model
number (based on size and pressure).
6. Use the Ordering Information Chart to determine the
part number (based on the model number).
7. Size inlet and outlet piping for velocity:
For heating or indoor applications –
4,000-6,000 ft./min. (1,219-1,828 m/min.)
For industrial or outdoor applications –
8,000-12,000 ft./min. (2,438-3,657 m/min.)
Note: Main valve noise data available through
ESP-Plus, or upon request.
8. Install drip traps ahead of regulators to drain
condensate from steam lines.
How To Size Series 2000 Main Valves
Downstream
system pressure at Relief valve set point pressure
no load pressure = downstream pressure plus
≤ 35 psig 5 psig
> 36 psig 10 psig
Pressure and/or Temperature Pilot Operated Steam Regulators (continued)
Series 2000