Product description The differential pressure method
EN 3925-0060 V207-00 MANUAL R03.doc 17
HeMaTech
Prüftechnik
The isolating valve shown in the illustration is an isolating valve which has been spe-
cially developed for leak testers from HeMaTech Prüftechnik. The special requirements
for leak testing were already accounted for in the development of the valve.
Due to the symmetric design, both measuring branches are simultaneously isolated
from each other when closing the valve. Volume and pressure differences therefore act
uniformly on both measuring branches, whereby measuring faults are ruled out. By
distinct separation of both measuring circuits, measuring errors caused by leaks in up-
stream filling valves are reliably prevented. The isolating valve is pneumatically con-
trolled and heating, caused by e.g. the coil of a solenoid valve, is thus avoided.
Leak testing equipment using the differential pressure method is well established in se-
ries production. A vast variety of work pieces and assemblies, ranging from ball-point
cartridges to vehicle engine blocks, are reliably tested for leaks.
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