OVERVIEW

Official designation: Haag + Zeissler 7400 (7400 Series, High-Pressure Rotary Joint)

Role/Application: Single-passage rotary union specifically designed for high-pressure cooling and hydraulic applications, ensuring dependable, leak-free transfer of water and hydraulic oil at medium speeds.

KEY SPECS SUMMARY

Power: N/A

Interfaces / Ports: Single flow; G or NPT thread (varies by revision)

Indicators: N/A

Operating Temp: Refer to the latest manufacturer manual.

Platform / Compatibility: Stainless steel housing; tungsten carbide seal

Limit: 250 bar maximum pressure (DN 20); 1500 rpm maximum speed (DN 8-DN 15)

Lifecycle: Refer to the latest manufacturer manual.

FREQUENTLY ASKED QUESTIONS

Technical Specifications:

Q: What is the primary sealing material used in the 7400 series for reliable high-pressure operation?

A: The 7400 series is equipped with a tungsten carbide mechanical seal suitable for high pressure.

Wiring & Installation:

Q: What is the difference in maximum pressure rating between the DN 15 and DN 20 connection sizes?

A: The DN 15 (1/2 inch) size supports 160 bar, while the larger DN 20 (3/4 inch) size supports up to 250 bar.

Troubleshooting & Compatibility:

Q: What is the maximum speed rating for the largest available connection sizes in the 7400 series?

A: The maximum speed for connection sizes DN 20 (3/4 inch) and larger is 1000 rpm.

Replacement & Upgrades:

Q: Is there an alternative high-pressure rotary joint series offered by the manufacturer for lower speeds?

A: The 7450 series with an aluminum housing and PTFE seal is designed for lower speeds but can also withstand pressures up to 250 bar.