Emerson Process Management 99 User Manual download pdf (Page 11)

Type 99

8. Four machine screws (key 130) hold both yoke

caps (keys 37 and 116) to the yoke legs (key 31).

Separate these parts to expose the pilot valve.

9. Unscrew the inlet orice (key 38) to inspect its

seat, the inlet valve plug (key 117), and valve

spring (key 124).

Note

Make certain that the yoke assembly is

square with respect to the cross member

of the body casting so that it will not

bind on the body.

10. When reassembling, screw in the inlet orice all

the way and secure the yoke caps to the yoke

legs. Replace two diaphragm plates, the

diaphragms, and inserts, two more diaphragm

plates, the hex nut, and the relief valve assembly.

11. Assemble the control spring and spring seat

into the body and spring case, being careful

that the diaphragms are free of wrinkles and

properly in place, and evenly installing the cap

screws in a crisscross pattern to avoid placing a

strain on the unit. Install the body ange adapter

with seal washers and cap screws. Install a new

gasket and secure the pilot to the lower casing

with eight cap screws. Set the control spring

according to the adjustment information in the

Startup section.

Converting the Pilot

Note

A complete pilot assembly rather than

individual parts may be ordered for

the following conversion procedure.

When a low pressure pilot is ordered

for eld conversion of a high pressure

pilot or vice versa, the replacement pilot

assembly comes complete with a pilot

cover (key 132, Figure 9). Remove this

cover before installing replacement pilot

on the existing regulator. The cover can

then be installed on the removed pilot

to form a complete Type 61 (low or high

pressure) pilot for use elsewhere.

When changing one pilot construction (low pressure, high

pressure, or extra high pressure) for another, all parts

attached to the lower casing (key 29, Figure 9) may need

to be replaced with those appropriate for the desired

construction. At the very least, when changing from a

low to high pressure pilot or vice versa, everything below

the lower pilot diaphragm (key 40, Figure 9) except the

cap screws and the hex nut (keys 47 and 13, Figure 9)

will need to be replaced. Actuator and main valve parts

may remain unchanged unless a change in service

conditions requires a change in seat construction, main

spring, or main spring seat. See the Parts List sections

for obtaining the appropriate conversion parts.

Main Valve Trim with Disk or O-ring Seat

This procedure is to be performed if inspecting,

cleaning, or replacing trim parts. Part key numbers

for a Type 99 regulator with disk or O-ring seat are

referenced in Figure 9, and part key numbers for

the disk seat unique to the 1000 psig (69,0 bar)

maximum inlet regulator are referenced in Figure 11.

Note

All trim maintenance may be performed

with the valve body (key 17, Figure 9

or 11) in the line and with the elbow

(key 23, Figure 9 or 11), pilot supply

tubing (key 24, Figure 9 or 11), and pilot

supply regulator (key 155, Figure 11, if

used) attached to the valve body unless

the valve body itself will be replaced.

1. Disconnect the pilot supply tubing and downstream

control line.

2. Loosen the union nut (key 14, Figure 9) and

remove the lower casing (key 29, Figure 9) with

the cap screw (key 22, Figure 9) or disk and

holder assembly (key 18, Figure 11) on

disassembly or reassembly. A thin-walled socket

may be used to remove the orice.

3. Access to the disk or O-ring (key 19, Figure 9) can

be gained by removing the cap screw and retainer

(key 21, Figure 9), while on the 1000 psig

(69,0 bar) maximum inlet regulator the entire

disk and holder assembly is removed as a unit.

If necessary, the holder (key 18, Figure 9 or 11) or

adapter (key 157, Figure 11) can be removed by

taking out the cotter pin (key 25, Figure 9 or 11).

4. Install a new body gasket (key 16, Figure 9) and

a new disk, O-ring, or disk and holder assembly

as necessary. Then slide the entire assembly into

the valve body and secure with the union nut.

5. Connect the pilot supply tubing and downstream

control line, then refer to the Startup section for

putting the regulator into operation.

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Emerson Process Management 99 User Manual Page 11

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