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Preparing and commissioning the VACUUM BOX / VACUUM BELL with VACUUM PUMP
• Set the required negative pressure using the regulating relief valve (8):
– Place the VACUUM BOX (2) / VACUUM BELL (2) on the membrane to be tested and then push it/them down.
– During the testing phase, the negative pressure (max. 0.5 bar) can be set using the adjusting nut (10) on the regu-
lating relief valve (8). To do this, the adjusting nut (10) must be screwed downward in a clockwise direction. (Fig. F)
– When the required value is set, the adjusting nut (10) of the regulating relief valve (8) needs to be locked
using the lock nut (11) (A/F 10). When in operation, the adjusting nut (10) must always be secured by the
lock nut (11). (Fig. G)
– Use the regulating relief valve (8) (Fig. K) to relieve the negative pressure.
Fig. F
Testing using a VACUUM BOX / VACUUM BELL with VACUUM PUMP
• The welding area must be dry and free of contamination. Dirt particles may compromise the test.
• The welding area to be tested is to be lubricated or sprayed with a liquid which forms bubbles (such as soapsuds)
directly before the test. (This is to ensure that the liquid has no unacceptable effects on the seam and the welding
material).
• Position the VACUUM BOX (2) / VACUUM BELL (2) at the point to be tested.
• Place the VACUUM BOX (2) / VACUUM BELL (2) and then push down on it so that the seam to be tested lies
at the approximate center of the longitudinal axis of the VACUUM BOX (2) / VACUUM BELL (2) (Fig. H). For
extended test sections, the VACUUM BOX (2) / VACUUM BELL (2) needs to be repositioned accordingly. When
moving the VACUUM BOX (2) / VACUUM BELL (2), make sure it/they overlap(s) the testing areas.
• To enable a negative pressure to be generated, the VACUUM BOX (2) / VACUUM BELL (2) must be pressed down
onto the testing area using both handles (4). (Fig. I)
The negative pressure is displayed on the manometer (6). The negative pressure should
never exceed 0.5 bar; disregarding this may cause an implosion.
• Check the weld seam for leaks.
• The seam is regarded as being tight when negative pressure builds up quickly, remains constant for the duration
of the test, and does not cause bubbles to form in the seam.
• Use the regulating relief valve (8) to relieve the negative pressure. (Fig. K)
• Mark and repair any areas that are not tight.
Fig. H
11
10
Fig. G
Fig. I
Fig. K
13
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