Diagnostic Quick Couplings

Diagnostic quick couplings are specialized components allowing for instantaneous, safe and leak-free connection of measuring equipment – such as pressure gauges, digital sensors or test leads – directly to the hydraulic system, also under full operating pressure.

Thanks to the use of test points, constant monitoring of the operating pressure and efficient diagnostics of possible failures are possible without the need to switch off the machine or disassemble installation elements. In the HYDRON offer, you will also find test couplings for test leads, which guarantee quick and tight connection of the measuring system.

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Main Technical Features of Measuring Quick Couplings

• Connecting under full pressure: Special design of the micro-valve enables safe connection of the test plug to a socket under operating pressure of even up to 400 bar.
• Leak-free design (Drybreak / Flush Face): After disconnection, the coupling immediately cuts off the flow of the medium, protecting the environment from oil leakage and preventing aeration of the system.
• Mechanical and anti-corrosion resistance: Made of hardened steel covered with a durable zinc coating, it ensures a high level of safety and resistance to damage and atmospheric conditions.
• Compliance with standards: Quick couplings comply with international standards, including ISO 15171-1, ISO 15171-2 and SAE J 1502 (types: DF, FD, PD, PJS).
• Protective caps: Equipped with rubber or metal caps protecting the socket against the ingress of dust, sand and moisture during the machine's daily operation.

Popular Standards and Thread Variants

In the HYDRON store assortment, diagnostic quick couplings are available in the most universal industrial standards:

• DF and PD series: Popular standard of snap and poppet couplings commonly used in construction machinery and industrial equipment.
• Threaded variants M16x2 and M14x1.5 (Minimess): Screw-on test points ensuring the highest level of safety at extreme working pressures. See details in the section M16x2 test couplings.
• Wide selection of connection threads: We offer sockets and plugs with metric and inch threads (M10x1, M12x1.5, M14x1.5, G 1/4" BSP, G 3/8" BSP and NPT).

Application in Machine Diagnostics

Diagnostic quick couplings are mounted at key points of hydraulic lines – directly at the main pumps, control valves, relief valves and actuators. They are commonly used in excavators, loaders, agricultural tractors, combines, hydraulic presses and mobile service trucks.

Frequently Asked Questions (FAQ)

Can the diagnostic quick coupling be connected while the hydraulic pump is running?

Yes, the design of diagnostic sockets and plugs allows for safe connection of the test lead with a pressure gauge even while the system is operating under high working pressure.

What is the purpose of the cap on the diagnostic socket?

The protective cap protects the interior of the socket against sand, dust and mud. Before plugging in the test plug, make sure the socket is clean so as not to introduce contaminants into the oil system.