4211-7, S.7
Operation & Maintenance Instruction
Page 7 of 10
September, 2017
7.1.14 Remove and SCRAP the diaphragm (15) from the
piston (13).
7.1.15 Remove the diaphragm follower (16) from the piston
stem (17).
7.1.16 Remove and SCRAP the vent protector seal (27) from
the washer (26) in the bottom of the housing (19). The seal
has an interference fit with the washer and can be pulled out.
7.1.17
WARNING: During the following procedure,
the spring (24) will be compressed. Exercise care so
that no parts are inadvertently expelled from the
assembly. Inadvertently expelled parts may cause
bodily injury and/or damage to property.
Carefully depress the washer (25) and spring (24) into the
housing (19), then, while holding these parts depressed,
remove the retaining ring (26) from its groove in the housing
(19). Slowly release the hold on the washer (25) and spring
(24) permitting the spring (24) to extend its full travel.
7.1.18 Remove the washer (25), spring (24) and exhaust valve
with seal (21) from the housing (19).
7.1.19 Remove and SCRAP the exhaust valve seal (22) from
the exhaust valve (23).
7.2 Cleaning and Inspecting
7.2.1 NON-REUSABLE PARTS
7.2.1.1
ALL
gaskets, o-rings, seals, the wire mesh strainer
and diaphragms
ARE TO BE SCRAPPED
and replaced with
NEW
Wabtec Corporation parts.
NOTE:
A Kit of Rubber Parts for the VX Vent Valve Portion is
available and may be obtained by ordering Part Number
654716. See Parts Catalog 3211-7, S.7 for parts included in
this Kit.
7.2.2 BODY AND HOUSING
IMPORTANT:
Cleaning solvents are to be used in a well
ventilated area.
7.2.2.1 Using a clean, lint-free rag that has been saturated
with the cleaning solvent, as described in Section 6.1.1, clean
the interior and exterior surfaces of the body (2) and housing
(19).
7.2.2.2 After these parts are cleaned, they
MUST BE
completely dried. Use a low pressure jet of clean, dry air to
blow the parts dry.
7.2.2.3 Inspect the body (2) and housing (19) for damage.
Pay particular attention to the bushings within the housing.
The bushings should be free of nicks, scratches and pits.
Replace the body and/or housing if found to be damaged, or
if they show signs of excessive wear, or if they are in such a
condition that may result in the unsatisfactory operation of
the VX Vent Valve Portion.
7.2.3 EXHAUST VALVE
7.2.3.1 Dip the exhaust valve (23) in a bath of the prescribed
cleaning solvent, Section 6.1.1 and promptly wipe it clean
with a clean, lint-free cloth.
7.2.3.2 Blow the exhaust valve (23) completely dry, using a
low pressure jet of clean, dry air.
7.2.3.3 Inspect the exhaust valve (23). It is to be replaced
if it is found to be nicked, cut, cracked, broken, or damaged
in any way, or if it is in such a condition that may result in the
unsatisfactory operation of the VX Vent Valve Portion.
7.2.4 REMAINING REUSABLE PARTS
7.2.4.1 Wash all remaining reusable parts using the cleaning
solvent as described in Section 6.1.1.
7.2.4.2 The springs (8, 24) may be wire brushed to assist
in the removal of any dirt, rust or scale.
7.2.4.3 After the parts have been cleaned, they
MUST BE
completely dried. Use a low pressure jet of clean, dry air
blow to the parts dry.
7.2.4.4 Inspect the piston (13). Replace the piston if it is
bent, broken, damaged, excessively worn, or if it is in such a
condition that may result in the unsatisfactory operation of
the VX Vent Valve Portion.
7.2.4.4.1 Remove the
1
/
8
" choke plug (14) from the piston
(13) and place it in a bath of the cleaning solvent to soak.
7.2.4.4.2 While the choke plug is soaking, inspect the
opening in the piston (13) from which the choke plug (14)
was removed to be sure that it is clean and free of dirt. If
necessary, blow the opening clean with a low pressure jet of
clean, dry air.
