Emerson LR128 Manual de Instruções descarregar pdf (Página 6)

Type LR128

Note

The Type LR128 internal inlet strainer

is intended to prevent occasional

large particles from entering the main

valve. If the owing media contains

continuous particles, upstream ltration

is recommended before the main valve

and in the pilot supply piping (reference

Figure 3). See the Specications section

for the corresponding mesh size of the

internal inlet strainer.

2. A Type LR128 relief valve or backpressure regulator

may be installed in any orientation, as long as ow

through the unit matches the direction of the arrow

on the main valve body and the pilot vent is pointed

down. However, for easier maintenance, install the

regulator with the bonnet up.

CAUTION

Provide adequate support to the bonnet

when disassembling Type LR128

relief valve or backpressure regulator

installed in a vertical installation or

other application where the bonnet is

not oriented upward. Without adequate

support, the bonnet may fall and cause

physical injury when the cap screws

are loosened.

3. The standard pilot mounting position is as shown

in Figure 1. Rotate the bonnet (key 2, Figure 7) or

the pilot (Figure 14) for other mounting positions.

4. An upstream control line is required and must be

installed – as shown in Figure 3 – into the 1/8 NPT

connection in the pilot body assembly (Figure 14).

Do not make the upstream pipeline connection in

or directly downstream of a turbulent area such

as a swage or elbow. A lter or strainer may be

installed in the control line upstream of the pilot

to provide clean uid. Inspect and clean this lter

regularly to make sure it is not plugged, which can

prevent proper pilot operation.

5. Run a supply pressure line from the upstream

pipeline to the restrictor inlet (use 3/8 NPT outer

diameter tubing or larger). Install a lter or strainer

upstream of the restrictor, if needed, to keep the

supply source from clogging the restrictor or pilot.

Inspect and clean this lter regularly to make sure

it has not been plugged which can prevent proper

relief valve or backpressure operation.

6. Apply a good grade of pipe compound to the

external pipeline threads for a threaded body

or use suitable line gaskets for a anged body.

Use approved piping procedures when installing

the relief valve or backpressure regulator.

WARNING

When used in relief valve service, the

Type LR128

may leak toxic chemical to

the environment. In toxic or hazardous

liquid service, leaked chemical may

accumulate and cause personal injury,

death or property damage due to

escaping uid.

To prevent such injury or damage,

provide piping or tubing to vent the

hazardous liquid to a remote, safe

location away from air intakes or any

hazard-prone location.

The exhaust

piping must be designed and installed to

guard against excessive ow restriction.

Protect the vent line or stack opening

against condensation or clogging.

For safety during shutdown, vent valves

are required immediately upstream

and downstream of the main valve on a

backpressure or bypass installation.

7. If system operation during maintenance is required,

install isolating and vent valves as needed.

8 The pilot spring case vent (key 54, Figure 14) must

be kept open to atmospheric pressure. A clogged

pilot spring case vent may cause the relief valve

or backpressure regulator to function improperly.

To prevent plugging (and to keep the spring case

from collecting moisture, corrosive chemicals or

other foreign material) point the vent down, orient

it to the lowest possible point on the spring case

or otherwise protect it. Protect the vent assembly

from icing, moisture or debris that may cause

blockage, as required. Inspect the vent regularly

to make sure it has not been plugged. To change

the vent orientation, twist the vent assembly in the

spring case.

9. To remotely vent a spring case, remove the vent

and install obstruction-free tubing or piping into

the 1/4 NPT vent tapping. Provide protection on a

remote vent by installing a screened vent cap onto

the remote end of the vent pipe.

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