Instruction Manual

Instruction Manual
D101643X012
ENVIRO-SEAL System - Rotary Valves
November 2011
6
Note
ENVIRO-SEAL PTFE packing systems can be used in either vacuum or positive pressure service. It is not necessary to reverse
ENVIRO-SEAL PTFE packing components in vacuum service.
Make sure that the Belleville springs are stacked properly and packing box parts are assembled in the correct order (see figure 6).
Packing parts cannot function properly if the Belleville springs or other packing parts are not stacked correctly.
5. With the shaft in place i n the valve, install the packing parts into the valve packing box.
Note
Be sure to install the packing rings in the sequence shown in figures 2 through 5.
a. Place one of the packing box rings (key 107) into the packing box. Be sure the packing box ring i s properly seated.
ThisdoesnotapplytoNPS3,4and6CL600A11valves.
b. For PTFE packing, place an anti-extrusion washer (key 106) into the packing box and push it in until it rests next
to the packing box ring (key 106 is not used with graphite packing).
Note
The graphite packing set has a carbon anti-extrusion ring on the top and bottom of the packing. These anti-extrusion rings are
designed to have a slight interference fit on the shaft. The rings have a single fracture to allow the ring to be installed on the shaft.
Additional fractures may develop while the valve is in service, however, these additional fractures will not affect the performance
of the ENVIRO-SEAL packing.
c. Place the packing set (key 105) into the packing box. Refer to figure 3 or 5 for the proper orientation of the
packing set.
d. For PTFE packing, place another anti-extrusion washer (key 106) into the packing box after the packing set (key
106 is not used with graphite packing).
e. Place the second packing box ring (key 107) into the packing box.
f. Locate the new spring pack assembly (key 103). Remove the O-ring and packing springs from the packing
follower. Use the packing follower to press the packing components into the packing box. Remove the packing
follower.
6. For A11, A31A, A31D and 8532 valves, install the anti-blowout wire (key 16) in the groove around the valve shaft.
7. Slide the packing follower from the new spring pack assembly over the valve shaft and the anti-blowout wire until it
rests against the packing box ring.
8. For all valves, install the longer packing studs (key 100).
9. For A11, A31A, A31D and 8532 valves, install the new anti-blowout flange (key 10) over the valve shaft, packing
studs, and packing follower. Secure the anti-blowout flange with the new jam nuts (key 17).
10. For all valves, install the spring pack assembly (key 103 or 104) which includes the Belleville springs, packing
follower, and O-ring arranged as shown in figures 2 through 6. (The O-ring is a non-functional part and is used to
retain the packing springs during assembly.)