Purging The Enviro-Seal Bellows Seal Bonnet - Emerson Fisher ET Instruction Manual

ET Valve
November 2017
4. If the valve plug and adaptor are not in good condition and must be replaced, first remove the valve plug/adaptor
assembly from the stem/bellows assembly; then remove the valve plug from the adaptor. First, place the
stem/bellows assembly and valve plug in a soft‐jaw chuck or other type of vise so that the jaws grip a portion of the
valve plug that is not a seating surface. Drive out or drill out the pin (key 8, figure 16, 17, or 20). Drive out the pin
(key 36, figure 14).
5. Reverse the stem/bellows and plug/adaptor assembly in the soft‐jaw chuck or vise. Grip the flat areas on the valve
stem just below the threads for the actuator/stem connection. Unscrew the plug/adaptor assembly from the
stem/bellows assembly. Unscrew the valve plug from the adaptor.
6. To attach either the existing valve plug or a new one to the stem of the new ENVIRO‐SEAL stem/bellows assembly,
first attach the plug to the adaptor (if the valve plug was removed from the adaptor) as follows:
a. Locate the adaptor. Notice that a hole has not been drilled in the threads where the plug screws onto the
adaptor.
CAUTION
To avoid damaging parts, do not grip the valve plug on any seating surface in the following procedure.
Figure 9. Double Graphite Ribbon/Filament Arrangements for Use in ENVIRO‐SEAL Bellows Seal Bonnets
A5870
b. Secure the valve plug in a soft‐jaw chuck or other type of vise. Do not grip the plug on any seating surface.
Position the plug in the chuck or vise for easy threading of the adaptor.
c. Thread the adaptor into the valve plug and tighten to the appropriate torque value.
7. Complete the installation by following steps 7 through 9 and steps 12 through 15 of the ENVIRO‐SEAL Bellows Seal
Bonnet installation instructions found on pages 14 and 15.
Purging the ENVIRO‐SEAL Bellows Seal Bonnet
The ENVIRO‐SEAL bellows seal bonnet can be purged or leak tested. Refer to figure 14 for an illustration of an
ENVIRO‐SEAL bellows seal bonnet, and perform the following steps for purging or leak testing.
1. Remove the two diametrically opposed pipe plugs (key 16).
2. Connect a purging fluid to one of the pipe plug connections.
3. Install appropriate piping or tubing in the other pipe plug connection to pipe away the purging fluid or to make a
connection to an analyzer for leak testing.
20
1
1
1
1
12B4181-A 18A0909-D
9.5 mm 12.7 mm
(3/8 INCH) (1/2 INCH)
STEM STEM FOR
NPS 2 VALVES
NOTE:
1 0.102 mm (0.004 INCH) THICK SACRIFICIAL ZINC WASHERS; USE ONLY ONE BELOW EACH GRAPHITE RIBBON RING.
BUSHING (KEY 13)
GRAPHITE FILAMENT PACKING RING (KEY 7)
GRAPHITE RIBBON PACKING RING (KEY 7)
1
SPACER (KEY 8)
1
12B6102-A
12.7 mm
(1/2 INCH)
STEM FOR
NPS 3 AND 4 VALVES
Instruction Manual
D100398X012