Janus Mv Series User Manual

Page: 99
MV & LV SERIES ENGINEERED DRY CHEMICAL FIRE EXTINGUISHING SYSTEM
OPERATION, DESIGN, & SERVICE MANUAL
REV C
Document # DOC324
Issued: April 26, 2018
Revised: March 22, 2022
UL FILE # EX27541
Section 7 System Recharge and Reset
NOTE: In any of the following steps, prior to replacing o-rings ensure that o-ring grooves are clean and
free of all foreign materials and dry chemical powder.
4. If using the Valve Rebuild Kit (Mv - P/N 19019 / Lv - P/N 19020), skip to step 11. Otherwise, mount
the piston key (Mv - P/N 97608 / Lv - P/N 97607) into a vise and then place the piston onto the piston
key.
5. Wipe piston clean of all foreign materials including dry chemical powder prior to lubrication and new
o-ring placment.
6. Use a pin-style spanner wrench (Mv - P/N 99526 / Lv - P/N 99525) to remove the piston cap by
turning it counter-clockwise.
7. Replace the lower piston O-ring (Mv - P/N 18476 / Lv - P/N 18399) around the piston cap.
8. Reinstall the piston cap using the piston key and spanner wrench. Tighten until the cap bottoms out
on the piston body.
9. Remove the upper piston O-ring on the piston body and discard.
10. Lubricate the new upper piston O-ring (Mv - P/N 18475 / Lv - P/N 18398) with Molykote 55 by Dow
Corning (P/N 19056) and install the new upper piston O-ring onto the piston body.
11. Lightly lubricate the internal valve bore with Molykote 55 by Dow Corning (P/N 19056) and insert the
valve piston into the valve body.
12. Remove the valve cap O-ring and discard.
13. To prevent damage to the new valve cap O-ring (Mv - P/N 18399 / Lv - P/N 18397) during installation
cover the threads of the valve cap with masking tape.
14. Lightly lubricate the new valve cap O-ring with Molykote 55 by Dow Corning (P/N 19056) and install
on the valve cap.
Table 7.3.2 Clean Agent Valve Replacement Components
Part Description Mv P/N Lv P/N
Collar O-ring 18400 18400
Upper Piston O-ring 18475 18398
Lower Piston O-ring 18476 18399
Valve Cap O-ring 18399 18397
Valve Core 16999 16999
Piston Removal Tool 97642 97642
Piston Key 97608 97607
Lubricant, 5.29 oz Tube 19056 19056
Tool, Valve Core Removal 19057 19057
Wrench, Spanner, Cylinder Cap 19058 19059
Wrench, Spanner, Piston 99526 99525
Valve Rebuild Kit
1
19019 19020
1
Valve Rebuild Kit includes the appropriate collar O-ring, valve cap O-ring, piston assembly (with upper and lower piston
o-ring), and valve core for the cylinder valve indicated by the kit part number.

Janus Mv Series Specifications

General

Brand	Janus
Model	Mv Series
Category	Fire Extinguisher
Language	English