Emerson 95 Series Pressure Reducing Regulators Manual de Instruções descarregar pdf (Página 6)

Types 95LD and 95HD

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

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Due to normal wear and damage that may occur

from external sources, the regulator should be

inspected periodically. Parts such as the O-rings,

gaskets, diaphragm, and packing should be replaced

as necessary. The frequency of inspection and

replacement depends upon the severity of service

conditions or the requirements of state and federal laws.

Suitable lubricants are shown in the assembly

drawings. Apply the lubricants as the regulator is

being reassembled.

Refer to Figure 4 or 5 while disassembling the

regulator. The regulator does not have to be taken

out of the pipeline to be disassembled. Relieve the

spring compression by turning the handwheel

(key 38) counterclockwise.



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If it appears that the valve does not shut off tightly,

the orice and valve plug may be worn or damaged.

Proceed as follows to check them.

1. Unscrew the valve plug guide (key 5) from the

body (key 1). The valve plug spring (key 10) and

the valve plug (key 4) will normally come out of

the body along with the valve plug guide.

2. Remove the orice (key 3). Examine the orice

and valve plug seating surfaces for damage.

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





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3. Lapping procedure:

a. Place a small amount of 500-grit silicon carbide

or aluminum oxide lapping compound on a at

surface such as a piece of heavy plate glass.

b. Take the valve plug or orice and move it in a

“Figure 8” motion on the lapping compound.

Do not allow the part to tip or rock since this

would round the corners.

c. Repeat step b for each part, this time using

an 800-grit or 1000-grit silicon carbide or

aluminum oxide lapping compound.

d. Wash away all traces of the lapping compound.

To help prevent scratching the seating surfaces,

a light coat of oil may be applied before returning

the valve plug and orice to the body.

4. Return the orice, valve plug, valve plug spring,

and valve plug guide to the body.



Leakage around the adjusting screw may indicate

worn packing material. Follow the instructions below

to replace the packing rings.

1. Take out the machine screw (key 41) and lift off

the washer (key 44) and handwheel (key 38).

2. Unscrew the packing box (key 32). Unscrew the

packing nut (key 35) and the packing follower

(key 34) off of the adjusting screw (key 33).

3. Unscrew and pull the adjusting screw out through

the bottom of the packing box.

4. Pull out the old packing (key 36) and replace it

with three new packing rings. Replace the

packing box gasket (key 37).

5. Reassemble the stufng box unit by returning the

adjusting screw to the inside of the packing box.

Slip the packing follower onto the adjusting

screw and into the packing box. Screw on the

packing nut.

6. Put the packing box back onto the spring case.

Set the handwheel and washer on the adjusting

screw and screw in the machine screw.

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When the regulator does not respond to differential

pressure changes or the loading pressure seems to

leak to the downstream piping, the diaphragm could be

worn out or ruptured. Inspect the diaphragm as follows:

1. Remove the cap screws (key 16) from the

diaphragm casing. Lift the entire spring case

(key 2) off of the body.

2. Take the upper spring seat (key 9), regulator spring

(key 11) and the lower spring seat (key 8,

Type 95HD) out of the lower spring case. In

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Emerson 95 Series Pressure Reducing Regulators Manual de Instruções Página 6

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