Industrial / Valves
Installation Guide for Danfoss GBC Shut-off Ball Valve
Quick installation and operation guide for the Danfoss GBC 90bar shut-off ball valve. Includes brazing instructions, torque specifications, and safety warnings for R 744 (CO2) systems.
Table of contents
Quick guide from the manual
This document provides installation and operation instructions for the Danfoss GBC 90bar shut-off ball valve. The valve is designed for R 744 (CO2) refrigerants. Only authorized personnel should operate this valve, as improper closing can lead to excessive system pressure.
Installation and Brazing
When brazing the valve into the system, follow these guidelines:
- No wet cloth is required during brazing.
- Always use N2 gas from the opposite side of the soldering point.
- Use a minimum of 5% Ag (silver) content in the solder.
- Observe strict time and temperature limits based on valve size.
- Maximum temperatures: 100°C (212°F), 150°C (300°F), and 850°C (1562°F) at specific points.
Schrader Valve and Cap Installation
If a Schrader valve is present, install it with a torque of approximately 0.3 Nm (0.2 ft-lbs). When tightening the cap, use the following torque values based on valve size:
- 6s - 12s: 10 Nm (7.4 ft-lbs)
- 16s - 22s: 15 Nm (11.0 ft-lbs)
- 25s - 35s: 20 Nm (14.8 ft-lbs)
- 42s: 32 Nm (23.6 ft-lbs)
Operation
The valve is operated by turning the stem 90 degrees. The valve is fully open when the slot is parallel to the flow direction and fully closed when perpendicular.
Technical Specifications
- Refrigerant: R 744 (CO2)
- Max working pressure (PS/MWP): 90 bar / 1305 psig
- Media temperature range: -40°C to 100°C (-40°F to 212°F)
Manufacturer information
Danfoss A/S
Practical help
Common problems
Excessive pressure build-up
Ensure only authorized persons operate the valve and verify system design.
Overheating during brazing
Follow specific time and temperature limits; use N2 gas from the opposite side.
Before use
- Verify refrigerant compatibility (R 744/CO2).
- Ensure system pressure does not exceed 90 bar.
- Check temperature range (-40°C to 100°C).
- Ensure installation is performed by authorized personnel.
- Verify Schrader valve torque (0.3 Nm) if present.
Specs in practice
- Max working pressure
- 90 bar / 1305 psig.
- Media temperature
- -40°C to 100°C (-40°F to 212°F).
- Schrader valve torque
- 0.3 Nm / 0.2 ft-lbs.
Images and diagrams
- Opening/Closing: 90-degree turn of the valve stem.
- Brazing: N2 gas must flow from the opposite side of the soldering point.
Model compatibility
- Designed for R 744 (CO2) refrigerants.
Manual page author
David Miller
Documentation analyst
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