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Valve Assembly and Testing Requirements
NOTICE:
Valve assembly and testing is to be done at a recommended temperature of 70°F. The
acceptable temperature range for valve assembly is 40°F to 100°F.
NOTICE:
When re-assembling it is important to notice which valve it is. To distinguish the A-522A from
the A-522 the cap (item 1) should be inspected for grooves, if grooves are identified the valve is going to
be an A-522A.
Test Equipment Requirements
4.4.1.1 Test Stand and Gauge Requirements
The test stand must have an appropriate mounting for the valve being tested. The pressure gauge must meet
the requirements of D4.5 Test Gauge Standards and be date-tagged.
4.4.1.2 Valve Testing Procedure
If your company has its own reassembly/test procedure, follow it. If it does not, the following procedure
provides the essential guidelines.
Valve Assembly and Testing Procedure
SAE Wrench
Component(s)/Description
Torque (ft-lb)
1-5/8” Wrench
Locknut (item 13)
5/8” Allen Wrench
Cap Screws (item 9)
1-5/8” Torque Wrench
Locknut (item 13)
150
5/8” Allen Torque Wrench
Cap Screws (item 9)
130
Other Tools, Supplies, and Equipment:
Solvent
To Clean the mounting and tongue
Lint-Free Cloth
To Clean Sealing Surfaces
Locktite
®
Feeder Gauge
Grease
Table 4-2 Valve Assembly Required Tools
NOTICE:
Perform this procedure only after you have conducted procedures in Section 4.0 Valve
Qualification for determining the condition of the valve components, repairing and replacing them.
Thoroughly clean the valve components to remove paint, dirt, oils and tank-car product from all surfaces. Clean
the valve ball (item 3) with water or immerse it in a heated, ultrasonic bath to ensure removal of all particulates.
Dry and wipe down the valve ball and all valve interior surfaces with a lint-free cloth. Secondary cleaning is
recommended during reassembly procedure.
Mount the valve body (item 4) onto the assembly fixture and secure it in place.
A-520/A-522/A-522A
, Rev. 3.0