Test coupling
A measuring coupling (also known as a screw coupling, diagnostic coupling or colloquially known as a minimess ) is a mechanically releasable check valve of the smallest nominal size . The opening fitting for the measuring coupling is located e.g. B. as a head piece on hoses or as an adapter on a pressure sensor .
Working principle
When an opening fitting is screwed onto the measuring coupling, the check valve opens and a direct connection to the medium is established.
Symbol of a test coupling
Internal structure of a test coupling
Measuring coupling with ball design
Measuring coupling with soft seal and pressure pin
Properties of a test coupling
General properties
- Coupling and uncoupling without system downtime
- Connection for pressure and pressure peak measurement with pressure sensors
- Occasional pressure monitoring
- System ventilation and sampling
- Vibration protection integrated in the screw cap
Technical characteristics
- Nominal width 2 mm
- Operating pressure 63 MPa
- Operating temperature –25 ° C to +100 ° C
Applications
The measuring coupling is preferably used for hydraulic and other oils based on mineral oil. It must not be used for technical gases (see also gas filling valves ). The screw couplings are used in various areas of mobile and stationary hydraulics, such as B. in construction machinery, in hydraulic unit construction, in machine and test bench construction or shipbuilding