
Ve t Li e / I -Li e Parallel Plate
Flame Arrester is desig ed for
i stallatio i ope ve t pipe or
bleed li es from storage or pro-
cessi g ta ks. Suitable for NEC
Group D (IEC Group IIA) vapors
Combi atio Pressure / Vacuum
Relief Ve t & Flame Arrester
provides pressure a d vacuum
relief as well as protectio from
propagatio of exter ally i tro-
duced flames. Suitable for NEC
Group D (IEC Group IIA) vapors.
Emerge cy Ve t protects ta ks
agai st rupture or explosio
resulti g from excessive
i ter al pressure caused by
exposure to fires.
Series 4950 Series 830
Series 7800
Pipe-Away Pressure Vacuum
Relief Ve t for applicatio s that
require hazardous vapors be
processed i to ma ifolded
pipi g a d ot released i to the
atmosphere
Series 18540
Ins alla ion & Main enance Series 54000
Spring Loaded Emergency Pressure Vent
ADDITIONAL PRODUCTS FROM PROTECTOSEAL
©2012 The Protectosea Company VM-54000/1
PROTECTOSEAL®
Safety Without Compromise
225 Foster Ave., Bensenville, IL 60106-1690
P630.595.0800 F630.595.8059
Spring Pac age Disassembly & Reassembly
Measure the compresse height of the springs in the spring
package (See Detail A) an recor this imension for later
use.
NOTE: This compressed spring height is critical in
that it establishes the set point of the vent.
1. The stu s on the vent are long enough so that all com-
pressive force of the springs can be relieve as spring
nuts are loosene . As the nuts are loosene , the spring
gui es will move upwar s, relieving spring forces. The
spring nuts shoul be loosene alternately an evenly so
that each of the springs are allowe to expan evenly
until the free length of the springs is reache .
2. Once the spring forces have been relieve , the spring
nuts, spring gui es, springs an pallet assembly may be
remove for inspection.
3. Inspect the iaphragm. If the iaphragm is eteriorate it
shoul be replace . Make sure that the nut securing the
iaphragm is fastene securely.
4. Inspect the seating surface. It shoul be smooth an free
of irt or nicks. If necessary, clean the seating surface
with an appropriate cleaner or solvent.
CAUTION: Do not use a file or sharp tool that
may damage the seat surface.
5. Reassemble the spring package assembly in the reverse
or er to above. Install pallet assembly, lower spring
gui es, springs, upper spring gui es an spring nuts.
Slowly compress the springs by tightening the spring
nuts evenly an alternately until the springs are at their
compresse height that was measure in Step 1 of this
process.
NOTE: This compressed spring height is criti-
cal in that it establishes the set point of the
vent.
6. Tighten spring nuts to secure position of spring plate.
7. Reinstall the screen, weatherhoo , hoo nuts an lifting
lugs.
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