Danfoss GBC Series - User Manual

Shut-o ball valve for R744 (45 bar/650 psi)
Type GBC 6s to GBC 54s
009R9517
009R9517
Installation guide
© Danfoss | DCS (sw) | 2017.03 DKRCC.PI.FB0.C5.02 | 1
Temperature range: -40 – 150 °C / -40 – 300 °F
Max. working pressure (PS/MWP):
45 bar/650 psi
Remove access cap (if present)
OPEN position
CLOSED position
Refrigerant: R744 (CO
2
)
Opening valve
Single-ow
1
2
Valve size
Max. Torque
Nm ft-lbs
6s - 22s 7 5.2
28s 17 12.6
35s 20 14.8
42s - 54s 34 25.2
Warning: Only authorized persons are allowed to operate this valve, as closing
can cause build-up of excessive pressure in the system.
For the application use with R744 as part of a secondary loop or cascade system should
refer to the datasheet for more attentions.
Applicable to all common non-ammable refrigerants, excluding R717. Alsofor noncorrosive
gases/liquids dependent on sealing material compatibility.
The design pressure shall not be less than the value outlined in Section 9.2 of ANSI/ASHRAE 15
for the refrigerant used in the system.
Danfoss
9G219.10
Component
to be insulated
Danfoss
9G227.10
A
t
t
e
n
t
i
o
n
!
D
o
n
o
t
r
e
m
o
v
e
t
h
i
s
n
u
t
A
t
t
e
n
t
i
o
n
!
D
o
n
o
t
r
e
m
o
v
e
t
h
i
s
n
u
t
Danfoss
9G228.10
A
t
t
e
n
t
i
o
n
!
D
o
n
o
t
r
e
m
o
v
e
t
h
i
s
n
u
t
A
t
t
e
n
t
i
o
n
!
D
o
n
o
t
r
e
m
o
v
e
t
h
i
s
n
u
t
A
t
t
e
n
t
i
o
n
!
D
o
n
u
t
r
e
m
o
v
e
t
h
i
s
n
u
t
Danfoss
9G229.10
Danfoss
9G230.11

Summary

Valve Specifications and Safety Information

Technical Data

Details on refrigerant compatibility, temperature limits, and maximum working pressure for the valve.

Application and Safety Warnings

Notes on refrigerant applicability, system pressure requirements, and operational safety advice.

Installation Procedures

Remove Access Cap

Instructions for removing the access cap if it is present on the valve.

Valve Opening and Closing Operation

Guidance on how to open and close the valve, including maximum torque specifications.

Brazing

Procedure for brazing the valve connections, specifying materials and temperature limits.

Install Schrader Valve and Cap

Steps for installing the Schrader valve and its cap, with torque recommendations.

Overview

1. Function Description
2. Important Technical Specifications
3. Usage Features
4. Maintenance Features

This document describes the Danfoss Shut-off ball valve for R744 (45 bar/650 psi), specifically types GBC 6s to GBC 54s. This valve is designed for use with R744 (CO2) as a refrigerant, but is also applicable to all common non-flammable refrigerants, excluding R717, and for non-corrosive gases/liquids, provided the sealing material compatibility is suitable.

Function Description

The Danfoss GBC shut-off ball valve serves as a component for isolating sections of a refrigeration system. Its primary function is to allow or prevent the flow of refrigerant or other compatible media through a pipeline. The valve features a ball mechanism that can be rotated to an open or closed position, thereby controlling the flow.

Important Technical Specifications

• Refrigerant Compatibility: Primarily designed for R744 (CO2). Also compatible with common non-flammable refrigerants (excluding R717) and non-corrosive gases/liquids, subject to sealing material compatibility.
• Temperature Range: -40 to 150 °C (-40 to 300 °F).
• Max. Working Pressure (PS/MWP): 45 bar (650 psi). The design pressure must meet or exceed the values specified in Section 9.2 of ANSI/ASHRAE 15 for the refrigerant in use.
• Valve Sizes and Torque Specifications:
  • 6s - 22s: 7 Nm (5.2 ft-lbs)
  • 28s: 17 Nm (12.6 ft-lbs)
  • 35s: 20 Nm (14.8 ft-lbs)
  • 42s - 54s: 34 Nm (25.2 ft-lbs)
• Brazing Temperature Limit: Maximum 150 °C (300 °F) during brazing.
• Brazing Material: Minimum 5% Silver (Ag) content is required for brazing.
• Schrader Valve Torque: If a Schrader valve is present, it should be installed with approximately 0.3 Nm (0.2 ft-lbs) of torque.

Usage Features

• Operation: The valve is operated by rotating a stem to switch between fully open and fully closed positions. The document illustrates both positions.
• Safety Warning: Only authorized personnel are permitted to operate this valve. Closing the valve can lead to an excessive pressure build-up in the system, which poses a safety risk.
• R744 Application: For applications involving R744 as part of a secondary loop or cascade system, users should refer to the datasheet for additional considerations and specific instructions.
• Insulation: The central component of the valve is designed to be insulated, indicating its role in maintaining temperature control within the system.

Maintenance Features

• Access Cap Removal: The first step in any maintenance or installation procedure is to remove the access cap, if present. This provides access to the valve's internal mechanisms or for brazing.
• Brazing Procedure: The installation guide provides clear instructions for brazing the valve into the system. It specifies a maximum temperature limit of 150 °C (300 °F) during brazing to prevent damage to the valve components. It also mandates the use of brazing material with a minimum of 5% silver content. The illustration shows the area to be heated during brazing and the area that should remain cool.
• Schrader Valve Installation: If a Schrader valve is present, the guide details its installation, including the recommended torque of 0.3 Nm (0.2 ft-lbs). This valve likely serves as a service port for pressure measurement or charging/evacuation of the system.
• Visual Indicators: The document illustrates the fully closed and fully open positions, which are crucial for proper system operation and troubleshooting. The "Attention! move this nut" labels suggest that certain nuts might need to be manipulated during installation or maintenance, possibly for securing connections or adjusting components.

Danfoss GBC Series Specifications