Emerson EZH and EZHSO Series Pressure Reducing Regulators Manuál s instrukcemi stáhnout pdf (Strana 4)

Type EZH Relief or Backpressure Regulator

CAUTION

When installing Type EZH trim in an existing

Fisher

E-body, damage can result if ow is not

in the correct direction. Look at the body web

to conrm that ow is in the correct direction—

up through the center of the cage and down

through the cage slots. Change the existing

ow arrow if necessary.

After assembly, check for shutoff and leakage

to atmosphere.

2. A Type EZH relief valve or backpressure regulator may

be installed in any orientation, as long as ow through it

matches the direction of the arrow on the main valve body.

3. Apply pipe compound to the external pipeline threads

before installing a relief valve or backpressure regulator

with threaded NPT end connections. Use gaskets between

pipeline and relief valve or backpressure regulator anges

when installing a relief valve or backpressure 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 relief valve or

backpressure regulator.

WARNING

When used in relief valve service, the Type EZH

main valve and pilot both exhaust gas. In

hazardous or ammable gas service, personal

injury, death, or property damage may occur

due to re or explosion of vented gas that

has accumulated. To prevent such injury or

damage, provide piping or tubing to vent the

gas to a safe location. The exhaust piping

must be designed and installed to guard

against excessive ow restriction. This piping

must be protected against condensation or

debris that could clog it.

For safety during shutdown, vent valves

are required immediately upstream

and downstream of the main valve on a

backpressure or bypass installation.

4. If system operation during maintenance is required, install

isolating and vent valves as needed.

5. For the Type PRX/182 pilot, if the vent assembly (key 12,

Figure 7) remains in the pilot body (key 1, Figure 7), then

it must be pointed down if possible or otherwise protected.

If the exhaust is to be piped to the main valve exhaust or

remotely vented, remove the vent assembly and install

tubing or piping into the 1/4 NPT pilot exhaust connection.

Protect the open end of the exhaust pipe by installing a

screened vent cap.

Type EZH

Type EZH Single-Pilot Relief Valve or

Backpressure Regulator

Type EZH Adjustment

The adjustment of setpoint (Figure 7), is performed by means

of the pilot adjusting screw, which varies the compression of

the control spring. Adjustment is performed while the relief

valve or backpressure regulator is in operation with the aid of a

pressure gauge to monitor upstream pressure.

Loosen the Type PRX pilot locknut and turn the adjusting screw

slowly clockwise to increase set pressure and counterclockwise

to decrease set pressure. Use a pressure gauge to monitor

the set pressure until the desired opening pressure is reached.

CAUTION

Personal injury or equipment damage, due

to bursting of pressure-containing parts may

result if this relief valve or backpressure

regulator is overpressured or is installed

where service conditions could exceed the

product and pilot pressure ratings.

Installation

WARNING

Personal injury, equipment damage, or

leakage due to escaping gas or bursting of

pressure-containing parts may result if the

Type EZH is installed where its capabilities

can be exceeded or where conditions

exceed any ratings of the adjacent piping or

connections. To avoid this, install a Type EZH

relief valve or backpressure regulator where:

• Service conditions are within unit

capabilities (including those in the

Specications section).

• Service conditions are within applicable

codes, regulations, or standards.

Additionally, physical damage to the relief

valve or backpressure regulator could break

the pilot off the main valve, causing personal

injury and property damage due to escaping

gas. To avoid such injury or damage, install

the unit in a safe location.

1. Only personnel qualied through training and

experience should install, operate, and maintain a relief

valve or backpressure regulator. Before installation,

make sure that there is no damage to, or debris in

the main valve body or pilot. Also, make sure that all

tubing and piping are clean and unobstructed.

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