Hoffman 754 Series Installation and operating instructions
INSTALLATION & MAINTENANCE
INSTRUCTIONS
HS-619
Series 754
Self-Contained Pressure
Reducing Regulator
For Steam Service
Maximum Body Pressure 250 Psig (17.3 bar)
Maximum Temperature 406°F (208°C)
• Before using product, read and understand instructions.
• Save these instructions for future reference.
• All work must be performed by qualified personnel trained in the proper application,
installation, and maintenance of steam systems in accordance with all applicable codes
and ordinances.
• To prevent serious burns, wear heat resistant gloves when opening and closing steam
valves, or handling hot equipment.
• To prevent serious burns, the internal pressure of the regulator must be 0 psi (0 bar) before
servicing.
• Connect a pipe to the blow down valve in such a way as to prevent exposure and injury
from discharge.
• To prevent property damage, personal injury, or death, cap off the gate valves if they
are not connected to a drain and when they are not in use for test or pressure relief.
Failure to follow this warning could cause property damage, personal injury or death.
IMPORTANT: To prevent system damage from water
hammer or sudden shock, open supply valves slowly. If you are uncertain about the product’s adaptability for
your application, please call the factory or
authorized representative before using the product.
WARNING CAUTION
!
WARNING
INSTALLATION
Steam
Supply Globe Valve Recommended
For Throttling Purposes
Optional By-Pass Line
Series 754
Pressure
Reducing
Regulator
By-Pass
Inlet
Relief
Valve
Y Strainer
Y Strainer
F&T
Trap Gate
Valve Gate
Valve
C
P
AF
H
G
R
D
E
F
Pipe Opening
G
J
1. Determine where to install the regulator, based
on the following requirements:
a. The regulator must be installed where it can
be accessed for adjustment and repair.
2. Install the following ahead of where the regulator
will be installed.
a. A drip trap (A), Y-strainer (P) and gate valve
(R). This insures dry steam.
b. A gate valve (C), Y-strainer (H), pressure
gauge (D), and union (E) in the inlet piping
(F).
c. Install a gate valve (G) in the Y-strainer (H)
for blow down.
3a.Cap off the outlet pipe (J).
b. Open the Y-strainer’s blow down gate valve (G).
c. Slowly turn steam on with full pressure for five (5)
minutes to blow down the inlet pipe (F).
d. Turn off steam and allow pipe to cool.
e. Remove cap from the outlet pipe (J) and
close the Y-strainer’s blow down gate valve (G).
• To prevent serious burns, the internal pressure of the regulator must be 0 psi (0 bar)
before servicing.
• Connect a pipe to the blow down valve in such a way as to prevent exposure and injury
from discharge.
Failure to follow this caution will cause personal injury.
!
WARNING
Steam
Supply
BJF
H
E
D
Steam
Supply K
L
Steam
Supply
J
C
M
N
5. Optional
Install bypass line (K) with a globe valve (L), for
manual regulation during servicing.
6. Install a steam pressure relief valve (M).
Check to make sure that the set point
is correct:
Systems Relief Valve Setting
Up to 35 psig At least 5 psi (.35 bar)
(2.4 bar) higher than outlet
pressure.
Over 35 psig At least 10 psi higher
(2.4 bar) than higher than outlet
pressure.
7. Check to make sure that the adjusting screw
(N) is backed out counterclockwise to relieve
spring tension. Slowly open gate valve (C)
and observe for leaks.
8. Slowly open the outlet gate valve (J). Turn
the adjusting screw (N) clockwise to increase
pressure to the set point. Allow the system to
stabilize. When set, tighten the regulating
screw locknut.
4a.Position and install the Series 754 Regulator
(B) with the adjusting screw (H) on top.
b. Install a union (E), a gate valve (J), and a
pressure gauge (D) in the outlet piping (F).
INSTALLATION COMPLETE
• To prevent serious burns, the
internal pressure of the regulator
must be 0 psi (0 bar) before
servicing.
• Connect a pipe to the blow
down valve in such a way as to
prevent exposure and injury from
discharge.
Failure to follow this caution will
cause personal injury.
TROUBLESHOOTING
We recommend replacing the Series 754
Regulator when parts no longer operate
properly. A new regulator is more economical
than repairing or replacing individual parts, and it will
provide greater reliability.
Problem:
1. Inadequate outlet pressure.
a. Cause: The regulator is not adjusted properly.
Solution: Loosen the locknut on the adjusting
screw and turn it counterclockwise.
b. Cause: Dirt in the strainer.
Solution: Open the Y-strainer’s blow down gate
valve and allow full steam pressure to
flow for two minutes.
c. Cause: Steam supply pressure is low.
Solution: Correct boiler steam pressure
problem.
d. Cause: Dirt under the seat, or the seat is
worn.
Solution: Disassemble regulator and inspect,
replace if necessary.
MAINTENANCE
SCHEDULE:
PROCEDURE:
•Initially, every 2-3 days after start-up until system
is clean.
•Every 6 months thereafter.
1. Inspect joints for leaks. Stop all leaks by tightening
bolts.
2. Clean strainers by opening the Y-strainer’s
blow down gate valve and allowing full steam
pressure to flow out for (2) two minutes. Then,
close the valve.
3. If steam escapes from the vent hole in the spring
housing area, replace the diaphragms.
Hoffman
Specialty
ITT Hoffman
3500 N. Spaulding Avenue
Chicago, Illinois 60618
Tel: 773.267.1600
Fax: 773.267.0991
Internet: www.hoffmanspecialty.com
!
WARNING
Printed in U.S.A. 6-98 511140
©1998 ITT Hoffman
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