Groth 1401E User Manual

Page 10

TOOLS:

All service, adjustment and assembly on the pilot
may be performed with the following common tools:

7/16", 1/2", 9/16", 11/16"

and adjustable wrench

Flat blade screwdriver

9/64" Hex socket key

7/8", 3/4" Deep socket

WARNING

The pilot diaphragm actuator housing and the valve
body are exposed to the process vapor. Observe all
standard safety precautions as specified on Material
Safety Data Sheets for the product(s) in the system
both while removing the valve and while repairing it.

DISASSEMBLY

To disassemble the pilot, first unload the spring by
removing the cap [1] and turn the adjustment screw
[2] counterclockwise until all spring compression has
been released. Remove (4) hex bolts [8] and remove
the spring bonnet [4]. Remove the spring and button.
Remove (12) hex bolts [12,13 & 14] and remove the
upper actuator housing [9] and gasket [10]. Remove
the stem nut [23] and stem assembly components:
[24, 29, 28, 37, 25, 15, 11, 30, 38, 15, 25, 31, 25 &
10]

Remove (8) hex bolts [16], the lower actuator
housing [39], body diaphragm [40], gasket [41] and
stem assembly. Remove socket cap screw [26] from
stem assembly. Remove seat bushing [34], jam nut
[21], blowdown needle [20] and blowdown bushing
[18]. Remove bug vent [7] from body and spring
bonnet. Replace worn or damaged components.
When a part is replaced, make sure the material is
suitable for the service, especially elastomer parts. If
an O-Ring needs to be replaced, be sure to use the
correct size and material. Prior to reassembly, make
sure all parts are clean and free of contamination.

ASSEMBLY

Before assembly, note the following material and tool
requirements:

1. Spare parts as listed in table 3.

2. Lubricants and thread sealants

Silicon Grease - Dow Corning No. 33

Fluoropolymer

Tape

3. Assembly tools

7/16", 1/2", 9/16", 11/16"

and

adjustable

wrench

Flat blade screwdriver

9/64" Hex socket key

7/8", 3/4" Deep socket

TABLE 4

RECOMMENDED BOLT TORQUE

[Ft. - Lb.]

Bolt Size

1/4"

5/16"

3/8"

7/16"

1/2"

Torque 6 11 20 32 44

Use fluoropolymer tape or anti-seize compound on
pipe thread joints. Use lubricant sparingly on other
screw threads. Do not over tighten threaded
connections. Damage or breakage may result.
Assemble with special attention to the exploded view
drawing on page 13.

Retract the blowdown needle [20] into the bushing
[18] to avoid damage to the needle and/or body, then
screw the bushing into the body. Tighten the bushing
firmly since it forms a metal to metal seal against the
body. Replace the fluoropolymer O-Ring [19] if it is
damaged. Install the O-Ring on the blowdown
needle and thread the jam nut [21] to help slide the
O-Ring into the groove on the bushing. Tighten the
jam nut against the bushing to squeeze the
fluoropolymer O-Ring into place. This will cold
form the O-Ring into the blowdown needle threads
and create an effective seal. Back off the jam nut and
adjust the needle as mentioned under
"OPERATION".

Fig. 11 Body Sub - Assembly

SECTION A-A