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It is recommended to install and isolation tap
and a vent tap. These can be useful for slam-
shut settings and verifications.
Check that the pilot impulse is connected
and in the case of an isolating tap (not
recommended) that it is open.
No modification should be made to the
structure of the equipment (drilling, grinding,
soldering...).
It is recommended to install a servicing
valve on the outlet pipeline to facilitate
adjustments and bleeding off to
the atmosphere.
In the version with integral slam shut, verify
that the safety manometric box (BMS)
and spring correspond to the appropriate
operating conditions on the outlet side of
the regulator.
The equipment should not receive any type
of shock, especially the release relay.
The user should verify or carry out a
protection adapted to the environment.
For DN 25 to 80, use long screws or threaded
stems when opening the actuator (warning
compressed spring).
The action of fire, seismic and lightening
are not taken into consideration in standard
regulators. If required, a special product
selection and/or specific calculations may be
supplied according to specific requirements.
A regulator may vent some gas to the
atmosphere. In hazardous or flammable
gas service, vented gas may accumulate,
causing personal injury, death or property
damage due to bursting of pressure-
retaining parts.
Vent a regulator in hazardous gas service to
a remote, safe location away from air intakes
or any hazardous location.
The vent line or stack opening must be
protected against condensation or clogging.
Types EZH and EZHSO
All Installations
(Single Regulator or Monitor Systems)
A Type EZH or EZHSO regulator bleeds no gas to
atmosphere during normal operation, thus making
the regulator suitable for installation in pits and other
enclosed locations without elaborate venting systems.
This regulator can also be installed in pits subject to
flooding by venting the pilot spring case above the
expected flood level so that the pilot setting can be
referenced to atmospheric pressure.
1. Install the regulator so that the flow arrow on the
main valve matches the flow direction of process
fluid through the regulator.
2. Apply pipe compound to the male pipeline threads
before installing a regulator with threaded NPT end
connections. Use gaskets between pipeline and
regulator flanges when installing a regulator with
flanged end connections. When installing buttweld end
connections, remove trim before welding and make
sure to use approved welding practices. Use approved
piping procedures when installing the regulator.
3. Type PRX pilots have a 1/4 in. NPT vent connection
in the spring case. To remotely vent gas from the
spring case, remove the screened vent and connect
1/4 in. piping or tubing to the spring case connection.
The piping or tubing should vent to a safe location,
have as few elbows as possible and have a screened
vent on its exhaust. Install the regulator and any remote
vent piping or tubing so that the vent is protected from
condensation, freezing or substances that may clog it.
CAUTION
!
To avoid freeze up due to pressure drop
and moisture in the gas, use anti-freeze
practices, such as heating the supply gas
or adding a de-icing agent to the supply gas.
15
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