Brochure

128
Selection Guides
Hoffman Specialty
®
Selection Guidelines
Series 2000 Typical Applications (continued)
Typical Two Stage Pressure Regulating Station with By-Pass
By-Pass
Spring Pilot
Relief
Valve
Y Strainer
Y Strainer
F&T
Trap
10 Pipe
Diameters
Steam
Supply
By-Pass
Spring Pilot
Y Strainer
Y Strainer
F&T
Trap
10 Pipe
Diameters
Reduced
Pressure
Main Valve A
Main Valve B
Description: The maximum pressure reduction for one valve is 150 psig
(10.3 bar) although 100 psig (6.9 bar) is recommended. Two stage reduction
should be used for pressure drops greater than 100 psig (6.9 bar).
By-Pass
Y Strainer
Y Strainer
F&T
Trap
10 Pipe
Diameters
Steam
Supply
By-Pass
Spring Pilot
Spring Pilot
Y Strainer
Y Strainer
F&T
Trap
10 Pipe
Diameters
Main Valve C
Main Valve D
Reduced
Pressure
Y Strainer
10 Pipe
Diameters
Spring Pilot
Y Strainer
Spring Pilot
10 Pipe
Diameters
Main Valve A
Main Valve B
Relief
Valve
Relief
Valve
Intermediate
Pressure Steam
Typical Two Stage Parallel Pressure Reduction with Intermediate Pressure Available
Description: Used when
the load varies and the
maximum pressure
reduction is greater than
150 psig (10.3 bar) and 100
psig (6.9 bar) is the
maximum recommended
pressure reduction. Main
valve A is sized for
1
⁄3 the
load
1
⁄2 of the pressure
reduction. Main valve B is
sized for 1/3 the load and
the other 1/2 of the
pressure reduction
. Main
valves C and D are sized
for the remaining 2/3 load.