WPG MRTALPCH611LDC, Процедура испытаний, Страница: 20 / 23

TST-019 MRTALPCH CHANNEL
– Rev. 2016-310
Page 18 of 20
12) Vacuum line sections and included fittings may be tested by moving up each line (toward the
vacuum generating system) to the next fitting, removing the hose and plugging it at the fitting,
or by installing the ball valve assembly into the pad line, which provides access to an additional
vacuum gauge when needed.
Individual parts and fittings can be tested in the same manner as the pad fitting is shown being
tested in
FIGURE 24 , where the capped off fitting was connected to the end of the ball valve with
the vacuum gauge, and the other end of the ball valve connected to an active vacuum line.
Vacuum was applied with the ball valve in the open position (handle in line with the valve) and
then the ball valve was closed (handle turned perpendicular to the valve) and the lifter turned
off.
If the assembly or fitting being tested leaks, it will be indicated by a drop in the vacuum level of
the ball valve’s vacuum gauge. If the vacuum level holds steady the fitting does not leak.
13) The following will describe the various methods used.
In
FIGURE 23
the quick connect is shown with the male connector attached and the barbed fitting
of the male plug capped off
. In this scenario, if the leak, as indicated on the lifter’s vacuum
gauge, were to stop, this indicates that the leak exists in the section (hose or fittings) that was
disconnected from the quick connect. If the leak continues, the indication is that the leak exists
between the capped barb and the filter connection. The next step would be to move to the next
fitting in the pad line, remove the hose leading from it to the quick connect, cap off the fitting
and repeat the test. If the leak continues, continue to work back towards the filter connection to
locate the leak. When the leak stops, it will be located within the last section that was
disconnected from the section being tested.
To test individual parts or assemblies, use the ball valve with the vacuum gauge. This is shown
in
FIGURE 25 , where only the female quick connect coupler is shown being tested; in FIGURE 24
where a single pad fitting is being tested; and in
FIGURE 18
, where a Y-fitting is being tested.
Attach the part to be tested to the end of the ball valve with the vacuum gauge, cap off any
open barbs, and attach the other end of the ball valve to an active vacuum line. Apply
( )
vacuum with the ball valve in the open position (handle in line with the valve) and then close the
ball valve (handle turned perpendicular to the valve) then switch the lifter to off
( ).
If the assembly or fitting being tested leaks, it will be indicated by a drop in the vacuum level of
the ball valve’s vacuum gauge. If the vacuum level holds steady, the part being tested does not
leak.
14) The ball valve assembly can also be
used in place of a plug, as shown in
FIGURE 26
. The gauge end of the ball
valve was connected to an additional
piece of hose. The pad line hose was
removed from the reducing fitting,
connected to the filter hose. Vacuum
was applied
( )
with the ball valve in
the closed position, then the power
switched off
( )
. If a leak were to be
indicated by a drop in vacuum, it will
exist in either the reducer fitting or the hose between the reducer and the filter.
FIGURE 26