Emerson EZH and EZHSO Series Pressure Reducing Regulators Manual de Instruções descarregar pdf (Página 9)

EZH and EZHSO Series

damage, provide pressure-relieving or

pressure-limiting devices to prevent

service conditions from exceeding those

limits. Also, be sure the installation is

in compliance with all applicable codes

and regulations.

Additionally, physical damage to the

regulator could break the pilot off the

main valve, causing personal injury

and property damage due to bursting

of pressure-containing parts. To avoid

such injury and damage, install the

regulator in a safe location.

All Installations

An EZH or EZHSO Series 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 also can be installed in pits subject to

ooding by venting the pilot spring case above the

expected ood level so that the pilot setting can be

referenced to atmospheric pressure.

1. Only personnel qualied through training and

experience should install, operate and maintain a

regulator. Before installation, make sure that there

is no damage to or debris in the regulator. Also,

make sure that all tubing and piping are clean

and unobstructed.

CAUTION

Eyebolts are installed to aid in the

handling and installation of the Regulator

Assembly only. Do not attempt to lift

more weight than the regulator with

these eyebolts.

2. Install the regulator so that the ow arrow on the

main valve matches the ow direction of process

uid through the regulator.

3. Apply pipe compound to the external pipeline

threads before installing a regulator with threaded

NPT end connections. Use gaskets between

pipeline and regulator anges when installing a

regulator with anged end connections. When

installing butt weld end connections, remove

trim before welding and make sure to use

approved welding practices. Use approved piping

procedures when installing the regulator.

WARNING

A regulator may vent some gas to

the atmosphere. In hazardous or

ammable gas service, vented gas may

accumulate, causing personal injury,

death or property damage due to re

or explosion. Install vent line(s) from

the regulator pilot(s) to a remote, safe

location away from air intakes or any

hazardous location. The end of the

vent line or stack opening must be

pointed down and protected against

condensation or clogging.

4. PRX Series pilots have a 1/4 NPT vent connection

in the spring case. The pilot vent opening should

be pointed down. Protect the vent opening from

condensation or clogging. To remotely vent gas

from the spring case, remove the screened vent

and connect 1/4 in. / 6.4 mm 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 that points

down on its exhaust. Install the regulator and any

remote vent piping or tubing so that the vent is

pointed down and protected from condensation,

freezing or substances that may clog it.

CAUTION

To avoid freeze-up because of 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.

5. The PRX Series pilot connections are 1/4 NPT.

Connect a downstream control (sense) line from

the “A” port on the bottom of the PRX Series pilot

to a straight run of pipe 6 to 10 pipe diameters

from the regulator outlet as shown in Figures 3

and 4, using 3/8 in. / 9.5 mm or larger outside

diameter tubing. If such a distance is not practical,

connect the control line away from elbows,

swages, nipples or any area where abnormal ow

velocities occur.

6. The PRX Series pilot connections are 1/4 NPT.

Connect a downstream bleed line from the “S” port

on the PRX Series pilot with a straight run of pipe

6 to 10 pipe diameters to the regulator outlet as

shown in Figures 3 and 4, using 3/8 in. / 9.5 mm or

larger outside diameter tubing.

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Emerson EZH and EZHSO Series Pressure Reducing Regulators Manual de Instruções Página 9

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