Instruction Manual

Low Pressure Regulators
Fisher and Fisher Regulators are marks owned by Fisher Controls International, LLC. The Emerson logo is a trademark and service mark of Emerson Electric Co. All other marks are the
property of their respective owners.
The contents of this publication are presented for informational purposes only, and while every effort has been made to ensure their accuracy, they are not to be construed as warranties or guarantees, express
ed
or implied, regarding the products or services described herein or their use or applicability. We reserve the right to modify or improve the designs or specifications of such products at any time
without notice.
Fisher does not assume responsibility for the selection, use or maintenance of any product. Responsibility for proper selection, use and maintenance of any Fisher product remains solely with
the purchaser.
Emerson Process Management
Fisher Controls International, LLC.
P.O. Box 8004
McKinney, Texas 75070, USA
Telephone: [phone]
Telephone: [phone]
©Fisher Controls International, LLC., 1986; All Rights Reserved
www.FISHERregulators.com/lp
Maintenance
To avoid personal injury or equipment
damage, do not attempt any maintenance
or disassembly without first isolating the
regulator from system pressure and relieving
all internal pressure.
Regulators that have been disassembled for
repair must be tested for proper operation
before being returned to service. Only parts
manufactured by Fisher should be used for
repairing Fisher regulators. Relight pilot lights
according to normal startup procedures.
Due to normal wear or damage that may occur
from external sources, these regulators must
be inspected and maintained periodically.
The frequency of inspection and replacement
of the regulators depends upon the severity
of service conditions or the requirements of
local, state, and federal regulations. Even
under ideal conditions, these regulators
should be replaced after 15 years from
the date of manufacture or sooner should
inspection reveal the need.
Visually inspect the regulator each time a gas delivery is
made for:
1. Improper installation.
2. Plugged or frozen vent.
3. Wrong regulator or no regulator in the system.
4. Internal or external corrosion.
5. Age of the regulator.
6. Any other condition that could cause the uncontrolled
escape of gas.
Failure to do the above could result in personal injury or
property damage.
Make sure the regulator vent, vent assembly, or vent tube
does not become plugged by mud, insects, ice, snow,
paint, etc. The vent screen aids in keeping the vent from
becoming plugged, and the screen should be clean and
properly installed.
Replace any regulators that have had water in their spring
case or show evidence of external or internal corrosion.
Checking for internal corrosion may require complete
removal of the adjusting screw and shut down of the gas
system. Closely examine regulators directly connected
to the container valve by means of a solid POL adaptor
(horizontal mounting) for signs of corrosion. Correct any
improper installations.
Older regulators are more likely to catastrophically fail
because of worn or corroded parts. Replace regulators
over 15 years of age; other service or environmental
conditions may dictate replacement of the regulator before
it becomes 15 years old, refer to Fisher Bulletin LP-32.
Regulator Repair
Regulators that have been disassembled for repair must
be tested for proper operation before being returned to
service. Fisher Type Y499-2 test rack can be furnished for
this purpose. Only parts manufactured by Fisher should be
used for the repair of Fisher regulators. Be sure to give the
complete type number of the regulator when corresponding
with the factory.
Figure 5. External Relief Valve Protects Downstream System
TYPE 289
SERIES
PLACE PROTECTIVE CAP
ON VENT PIPE
TYPE R722
SERIES
POINT VENT
DOWN
!
WARNING