Emerson EZL Series Pressure Reducing Regulator for Low Pressure Applications Instrukcja Obsługi Pobierz pdf (Strona 7)

Type EZL

Note

When upgrading Fisher

control valves,

such as Types ET, ED and ES make sure

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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 comlb to the external pipeline threads

before installing a regulator with threaded end

connections. Use gaskets between pipeline and

regulator anges when installing a regulator with

anged 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.

WARNING

A regulator may vent some gas to the

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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.

4. 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. / 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 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 freezeup 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. Run a 3/8 in. / 9.5 mm outer diameter or larger pilot

supply line from the upstream pipeline to the lter

inlet as shown in Figure 3, bushing the line down

to t the 1/4 in. threaded NPT lter connection.

Do not make the upstream pipeline connection in

a turbulent area, such as near a nipple, swage or

elbow. If the maximum pilot inlet pressure could

exceed the pilot rating, install a separate reducing

regulator in the pilot supply line. Install a hand valve

in the pilot supply line and provide vent valves

to properly isolate and relieve the pressure from

the regulator.

6. Attach a 1/2 in. / 12 mm piping or tubing

downstream control line to the 1/2 in. threaded NPT

control line connection on the actuator casings.

Connect the other end of the control line to the

pipeline downstream of the regulator. Do not attach

the control line near any elbow, swage, block valve

or any other location that might cause turbulence.

Install a full port ball valve in the control line to

shutoff the control pressure when using the bypass.

7. If a quick acting solenoid is to be installed

downstream of a regulator, the regulator and

solenoid should be located as far apart as practical.

This will maximize the gas piping volume between

the regulator and solenoid and improve the

regulator response to quick changing ow rates.

8. Consult the appropriate instruction manual for

installation of an optional pneumatic or electric

remote control drive unit. For optional remote

pneumatic loading of a 6350 or 61 Series pilot,

make the loading piping connections to the

1/4 in. NPT vent connection.

Wide-Open Monitor Regulator (Figure 4)

1. Follow the procedures in the All Installations

section and then continue with step 2 of

this section.

2. Connect the control line of the wide-open

monitoring regulator to the downstream piping

near the working regulator control line connection.

During normal operation, the wide-open regulator

stands wide-open with the pressure reduction

being taken across the working regulator. Only

in case of working regulator failure does the

wide-open monitoring regulator take control at its

slightly higher setting.

Regardless of which regulator is used as the monitor,

it should be equipped with a pilot supply regulator

set to limit the pilot supply pressure to 10 to 15 psig /

0.69 to 1.0 bar above control pressure. Since the

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