Installation, Operation, Maintenance
Disassembly and Assembly Instructions
for Model AL404 Liquid Level Vent Valve
February 2001
Form FVC 045 - Rev.1
WARNING
KEEP THIS DOCUMENT WITH THE PRODUCT UNTIL IT REACHES THE END USER.
Before installation or removal of any tank valve, the system must be purged completely of all product. Use proper safety equipment at all
times. An
abundant supply
of clean water must be readily available and easily accessible as a means of providing immediate first aid
treatment for exposure to anhydrous ammonia. For LP-Gas service follow NFPA / ANSI 58 Standard for the Storage and Handling of
Liquefied Petroleum Gases, plus all Local and State Safety Regulations.
To insure long term safe operation, the manufacturer recommends
that under normal service conditions this product should be inspected at least once every five (5) years and be repaired or replaced as
required. To prevent the accidental opening of any valve, never carry or grasp a valve by its handwheel or handle.
CAUTION:
Contact with or inhalation of Liquid Anhydrous Ammonia or L-P Gas or their vapors can cause serious injury or death.
Dispersement must be in accordance with local regulations.
For the proper handling and storage of Anhydrous Ammonia refer to ANSI Standard K61.1.
For the proper handling and storage of Liquified Petroleum Gas refer to NFPA Pamphlet 58.
TOOLS REQUIRED:
Safety Equipment (i.e. gloves, goggles, and clothing), 1" Open End Wrench, a Blade Type Screwdriver,
and a 14" Adjustable Wrench.
REFER TO FIGURE 1 FOR THE FOLLOWING STEPS
:
Step 1:
Safety Equipment (i.e. gloves, goggles, and clothing) must be worn before continuing with the next step.
Step 2:
Before removing the Liquid Level Vent Valve, place in FULL OPEN POSITION, by turning the handle (CCW).
Step 3:
Open the bleed valve installed in the side body port and
bleed all pressure
from the Tank or Piping.
NOTE:
See Warning at top of page.
Removal of Valve for Repair or Replacement
Disassembly Procedure for Repair of Valve
REFER TO FIGURE 1 FOR THE FOLLOWING STEPS:
Step 1:
With the valve secured in a bench vise, remove the Panhead Screw (6) and Washer (7) using a blade type screw driver.
Remove Handwheel (5) from Stem (2).
Step 2:
Remove the hexagonal Bonnet (3) using a 1” open end wrench.
Step 3:
To remove the Stem (2) from the Valve Body (1) place the Handwheel (5) on the flats of the Stem (2) and rotate
counterclockwise (ccw).
Step 4:
Remove the O-Ring (4) from the Stem (2).
Step 5:
Using a flashlight inspect the internal bore and Body seat area for any scratches or debris attached to the seat. Using an
aerosol spray cleaner, clean out the internal bore of the Body to remove any foreign substance along the walls or on the
internal threads or seat.
NOTE:
If scratches or draw marks are found at the Body seat area the valve may leak when pressure tested. This may
be cause to replace the valve.
Step 6:
Clean the threads on the Stem and Bonnet with an aerosol spray cleaner, including the external bonnet threads on the Body.
(OVER)
