Installation; Differential Pressure Regulator Installation Schematics; Before Installing The Regulator - Fisher MR95L Instruction Manual

Installation

WARNING
!
Personal injury or system damage
may result if this regulator is installed,
without appropriate overpressure
protection, where service conditions
could exceed the limits given in the
Specifications section and/or regulator
nameplate. Refer to Overpressure
Protection section for recommendations
on how to prevent service conditions
from exceeding those limits.
Additionally, physical damage to the
regulator may result in personal injury
or property damage due to escaping of
accumulated gas. To avoid such injury
and damage, install the regulator in a
safe location.
Under enclosed conditions or indoors,
escaping gas may accumulate and be an
explosion hazard. In this case, the vent
should be piped outdoors.
For regulator constructions with a
spring case vent, the vent should be
kept open to permit free flow of gas
to the atmosphere. Protect openings
against entrance of rain, snow, insects
or any other foreign material that may
plug the spring case vent or vent line.
BLOCK
VALVE
(OUTLET) VENT
(INLET) VENT
TYPE MR95LD REGULATOR (ALSO TYPICAL OF TYPE MR95HD)
Figure 3. Differential Pressure Regulator Installation Schematics
ATMOSPHERE
TYPE 67CFR REGULATOR

Before installing the regulator:

• Unpack the regulator and remove the protective
shipping plugs from the end connections of
the body and the pressure connection in the
spring case.
• Check the regulator and make sure it has not
been damaged or collected foreign material
during shipping.
• Remove any debris or dirt in the tubing and
the pipeline.
• Apply pipe compound to the external pipe thread
for NPT bodies or use appropriate gaskets for
flanged bodies.
• Make sure gas flow through the regulator is in the
same direction as the arrow on the body.
On 1-1/2 or 2 in. / DN 40 or 50 Types MR95H, MR95HP
and MR95HT regulators, the spring case vent is tapped
so a vent line can be connected to provide venting to a
remote location. On 1/4 NPT, 1/2, 3/4 and 1 in. / DN 15,
20 and 25 Types MR95H, MR95HP and MR95HT body
sizes, the tapped vent option is available on request.
Protect the exposed end of the vent pipe with a weather
and insect resistant vent assembly. Periodically check
all vents and remote vent lines to ensure that they
are unobstructed.
On Types MR95LD and MR95HD regulators, the
loading pressure is connected to the 1/4 NPT
connection in the spring case.
MR95 Series
PLANT AIR
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