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Maximum pressure for pressure connection G 1/8 and 1/8 NPT

Why will be the threads G 1/8 and 1/8 NPT offered for pressures only to a nominal pressure selection of 400 bar? Where does diaphragm seal from?
Basically, the explanation is very simple: From a certain pressure limit, the thread flanks are no more ?strong? enough to resist the force of the applied pressure. If the pressure is too much, there is a threat of shearing for the thread. By digital pressure gauge , the pressure limits result from DIN EN 837-1.
Attention: The maximum pressure up to which a thread may be used depends not only on the thread diameter, but also on the selected sealing type and the material of the counter-thread.

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