Brochure

130
Selection Guides
Hoffman Specialty
®
Selection Guidelines
1. Use the Selection Data Chart (page 60) to determine
the body code required.
2. Determine the capacity required by using the General
Usage Formulas and tables (page 104).
3. Determine the available initial steam inlet pressure.
4. Determine the outlet pressure required, based on your
heating or cooling equipment.
5. Use the capacity tables to select the regulator required.
Example:
What size regulator is required to heat 500 GPH (1892
LPH) of water from 60°F (15.5°C) to 160° (71.1°C) [100°F
(55°C) temperature rise]? The regulator inlet pressure is
15 psig (1.0 bar) and the heat exchanger operating
pressure is 9 psig (.6 bar).
Solution:
Use Table to determine the required capacity of 420
lbs./hr. (190 kg/hr.). Use the single seat body code 01 or
02 capacity tables. You can use a 1-1/4" NPT valve rated
for 572 lbs./hr. (260 kg/hr.)
1. Use the Selection Data Chart (page 60) to determine
the body code required.
2. Determine the capacity required by using the General
Usage Formulas and tables (page 104).
3. Determine size required:
– For body codes 01, 02, and 02R use
Cv/Kv in capacity tables.
– For body codes 05, 05R, 06 use capacity
graphs.
To determine the Cv when you know the required flow rate
(in GPM) and the differential pressure; use the formula,
page 104.
Gravity can be ignored when the water temperature is
under 200°F (93°C).
Example:
To handle a maximum flow of 20 GPM at 22 psi
differential, the Cv required is:
20
CV =
22
= 4.26
Solution:
You can use a 3/4" body code 01 or 02 with an actuator for
the required temperature.
Note: To convert GPM to LPM, multiply the GPM by 3.78.
For Steam
For Water
How to Size Series 1140 & 1141 Regulators
Series 1140 & 1141 Temperature Regulators