PROTECTOSEAL SERIES O. 30
TA K BLA KETI G VALVE
Installation & Maintenance Guide
Page 5
When reassembling the blanketing valve, be sure to replace any worn or damaged O-rings
and gaskets.
■ MAIN VALVE (See Fig. 6)
Before reassembling the main valve, the #28 and #29 O-rings should be lubricated with
an appropriate lubricant. Reinsert all six O-rings in their proper positions. It is recommend-
ed that a conservative amount of anti-seize compound be applied to the fine threads of the
lower plug before it is threaded back into the valve body. Hold the #30 poppet upside
down, insert the #31 poppet spring in the recess in the end of the poppet, and insert the
#32 spring pin into the spring. Slide the #33 lower plug assembly over the spring pin,
spring and poppet and pop it into place. The poppet should move easily up and down
inside the lower plug, being pushed up by the poppet spring. If it has been removed, push
the #26 upper plug back into the #34 valve body. The orientation of the cross holes in the
upper plug is not important. Slowly, being careful not to damage the end of the stem on the
poppet or the seat at the bottom of the upper plug, insert the lower plug/poppet assembly
into the valve body. Thread the lower plug into the body until the nut is seated against the
valve body and the marks on nut and body line up.
Reassembly
■ DIAPHRA M CASE (See Fig. 4)
With the blanketing valve body upright, place the #15 gasket on top of the body. Place the
#14 lower case over the gasket and secure it with four (4), #7 hex screws and #8 lock
washers, tightening to 96 in-lbs. If the #9 diaphragm assembly has been disassembled,
then reassemble it as shown in Fig. 5. Apply thread adhesive to the thread connection and
tighten until lock washer and plates are compressed.
Place the #9 diaphragm assembly on the lower
case. Place the #12 gasket over the diaphragm
and line up the bolt holes. Place the #6 set
spring over the #19 lower anchor of the
diaphragm assembly and insert the #5 upper
anchor in the top of the spring. While holding the
spring upright with one hand, slide the #10
upper case assembly until it rests on top of the
diaphragm. Line up the bolt holes, insert the
eight (8), hex screws, lock washers, and nuts and
tighten to 96 in-lbs. Tighten the hex screws in the
order as shown in Fig. 3. Fig. 3
Reinstallation & System
Check
Follow the installation and start-up instructions on page 2 to reinstall the blanketing valve
after maintenance. After reinstalling the blanketing valve, a soap test should be performed
again. If leakage is detected, then the point of leakage should be noted, and the valve
should be disassembled as appropriate to identify the gasket or O-ring past which the leak
is occurring.
If the blanketing valve flows continuously and does not seal after start-up, then the system
should be shut down so that the problem can be identified. See the section “troubleshoot-
ing” on page 23 for possible problem sources. Any time that a blanketing valve is disas-
sembled and reassembled, its operation should be monitored for a period afterward.
