In hydraulics, precision is crucial - for example, even small connection errors between hose and connector can impair functionality and significantly reduce the hose assembly’s service life. To ensure the consistently high quality of hose connections, a simple yet reliable final inspection is essential. The STAUFF Dornvos test mandrels, the mechanical test system for checking nipple insertion, were developed precisely for this purpose.
As numerous field reports show, inadequate or incorrect crimping can lead to leaks, structural damage and even safety-critical failures. Common causes include incorrect crimping dimensions, unsuitable tools or poorly maintained machines often remain undetected without targeted testing.
This is where STAUFF Dornvos comes in - as a simple test step directly after crimping, before the hose assembly goes into operation.
STAUFF Dornvos is a specially developed test system consisting of test mandrels that can be used to quickly and clearly check the inside diameter of crimped, straight Ecovos hose fittings.
The principle is as simple as it is effective:the mandrel corresponding to the nominal diameter is inserted into the fitting. By checking the insertion using the test mandrel in accordance with Stauff's specifications, the correct reduction in nipple diameter can be verified.
Dornvos is available either individually or in a practical complete case - ideal for workshops, service vehicles or series production. The system was specially developed for all straight Ecovos hose fittings from STAUFF in nominal sizes DN 06 to DN 51.
Simple test procedure without the need for training
Our Dornvos system is intuitive to use and delivers a clear result within seconds.
This is an unbeatable advantage, especially in workshops with high throughput or in mobile hydraulic services: precise inspection without wasting time - and without additional training.
Whether for compact hoses (e.g. 2SC) or multispiral hoses (e.g. 4SP, isobaric hose types): Dornvos covers all nominal sizes from DN 06 to DN 51. The associated test mandrels are matched to the respective inner diameters of the compression nipples - based on STAUFF's specifications. The test ensures process reliability in production.
In addition to the test mandrels for our Ecovos hose connectors, the product rangealso includes matching mandrelsfor our Multivos hose connectors.
STAUFF offers Dornvos as individual test equipment for specific nominal sizes or as a complete set with all test mandrels including a sturdy transport case. The modular case design allows for easy integration into existing testing processes - stationary or mobile.
Service partners with workshop vehicles in particular benefit from the robust, compact design and ease of use on site.
How exactly are the test mandrels used? We explain it here, in simple and clear steps. Click through the images to understand how the mandrels work:
If necessary, the pressing dimension can be adjusted and the fitting pressed again - until the result is correct.
No nipple collapse was created by pressing. Press dimension is too large.
ATTENTION: The connection is not functional. Leakage and risk of the hose slipping out of the crimped fitting
from the crimped fitting. The crimping diameter must be reduced by a few tenths of a mm!
The minimum nipple collapse is present.
The press diameter can be reduced by a few tenths of a millimetre without risk!
The optimum nipple collapse has been reached. The crimping diameter should no longer be changed.
However, it must be checked before every hose batch change.
The crimping dimension achieved will correspond to the standard crimping dimension determined from the crimping dimension table.
This indicates that the maximum nipple collapse has been reached and the crimping diameter must not be reduced any further,
otherwise there is a risk of premature failure of the hose line!
The nipple has collapsed too much in the sealing zone due to the excessively tight compression.
ATTENTION: The integration is not functional. This fault can lead to premature failure of the hose line.
The crimping diameter must be increased by a few tenths of a mm!
Dornvos is available for all nominal sizes from DN 06 to DN 51.
Excessive or insufficient nipple collapse can indicate compression errors that lead to leaks, material failure or safety-critical failures. The test helps ensure a consistently safe and reliable hose assembly..
After crimping, the correct mandrel for the corresponding nominal diameter is inserted into the inner diameter of the connector. The test resistance indicates whether the connection is correct or needs reworking.
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