Emerson LR128 Manual de Instruções descarregar pdf (Página 8)

Type LR128

PILOT SUPPLY CONNECTION: 1/4 NPT PIPE

CONNECTS TO UPSTREAM PILOT SUPPLY TAP

LOADING CONNECTION: 1/4 NPT PIPE CONNECTS TO

TYPE LR128 DIAPHRAGM LOADING PORT

OUTLET CONNECTION: 1/4 NPT PIPE

CONNECTS TO PILOT INLET CONNECTION

OPTIONAL LOADING CONNECTION:

1/4 NPT NORMALLY PLUGGED

11B5004-A

Figure 4. Type 112 Restrictor

Pilot Adjustment

The factory setting of the regulator can be varied

within the pressure range stamped on the nameplate.

To change the set (control) pressure, loosen the

jam nut (key 17, Figure 14) and turn the adjusting

screw (key 15) clockwise to increase set (control)

pressure or counterclockwise to decrease it. Monitor

the set (control) pressure with a test gauge during the

adjustment. Tighten the locknut to maintain the

desired setting.

Recommended set (control) pressure ranges available

and color codes of the respective springs are shown in

Table 3.

Type 112 Restrictor Adjustment (Figure 5)

The Type 112 restrictor controls the relief valve or

backpressure regulator’s accuracy and speed of

response. A restrictor setting of “6” for the 1, 2 and

3 in. sizes and “8” for the 4 in. size are recommended

to optimize accuracy, speed of response and stability.

However, the restrictor can be used to ne tune the

relief valve or backpressure regulator for maximum

performance by decreasing the restrictor setting for

tighter control (increased opening speed, decreased

closing speed); or increasing the restrictor setting

for maximum stability (decreased opening speed,

increased closing speed). A lower setting also provides

a narrower proportional band for better accuracy. The

“8” position has the largest ow, is most stable and

easiest for startup. The “0” setting has the smallest

(minimum) ow passage; at no point of rotation will the

Type 112 restrictor be completely shut off.

Note

Mineral, dirt and sediments may

gradually deposit and build up inside the

spaces of the restrictor. This may cause

the unit response to get slower and unit

performance to decrease. If clogging of

the restrictor is suspected, immediately

check and clean the restrictor.

Regular inspection of the restrictor

is recommended to ensure optimum

performance. Refer to the Type 112

Restrictor Maintenance section.

Likewise, debris in the process uid

may clog the restrictor. Install strainer

upstream of the regulator to prevent

debris from clogging the restrictor.

Regular inspection, maintenance and

cleaning of the strainer is recommended

to ensure optimum performance.

Recommended Type 112 Restrictor

Settings and Restrictor Setting Guide

(Table 4 and Figure 5)

This guide can be used to adjust performance

according to application conditions. The recommended

initial setting is “6” for the 1, 2 and 3 in. sizes and “8”

for the 4 in. size (see Table 4).

Maintenance

Relief valve or backpressure regulator parts are

subject to normal wear and must be inspected

periodically and replaced as necessary. Due to the

care Emerson™ takes in meeting all manufacturing

requirements (heat treating, dimensional tolerances,

etc.), use only replacement parts manufactured or

furnished by Emerson. Also, when lubrication is

required, use a good quality lubricant and lightly coat

the recommended part.

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Emerson LR128 Manual de Instruções Página 8

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