Bürkert Whisper normally closed valve 6724 2/2 NC combines high chemical resistance, very fast and silent switching (3 ms at 30 dB(A)) and high back pressure tightness in a compact design of only 8.9 mm width.
This valve is either available with a Bürkert flange for connection to a manifold, or threaded 1/4-28 UNF version for tighter connection with fittings or a tube connector.
Connector with flying leads available for direct electrical connection.
General
A compact and light solenoid valve for various applications, from medical to aerospace. Thanks to its small size, it can be easily integrated into complex systems or used to manipulate low fluid volumes. The 6724 is on/off or proportional: use it as a standard 2/2 NC, or to control the flow rate if necessary.
- Rocker valve with separating diaphragm
- High chemical resistance: body in PEEK or PPS, seal in FFKM, KFM or EPDM
- Compact design: 9 mm width (valve only)
- Orifice diameter: 0.8 mm or 1.2 mm
- Switching time of 3 ms, switching noise < 30 dB(A) and power consumption < 1 W
- High back pressure tightness
- Excellent cleanability
- 100% duty cycle
- Voltage: 24V DC
- Port connections with Bürkert flange for the connection to a manifold or 1/4-28 UNF for easier connection to the fluidic line or Tube connector
See all the valve characteristics in the "Specifications" and "Documentation" tabs.
| Reference |
Function |
Orifice (mm) |
Port connection |
Kv value water (m3/h) |
Cv value water (gpm) |
QNn value air (L/min) |
Pressure range (bar) |
Body material
|
Seal material
|
| BU-20034162 |
2/2 NC |
0.8 mm |
Bürkert sub-base (9 x 26) |
0.01 |
0.012 |
10.7 |
0 - 5 |
PEEK
|
FFKM
|
| BU-20071068 |
2/2 NC |
0.8 mm |
1/4-28 UNF |
0.01 |
0.012 |
10.7 |
0 - 5 |
PEEK |
FFKM |
| BU-20071070 |
2/2 NC |
0.8 mm
|
Bürkert sub-base (9 x 26) |
0.01 |
0.012 |
10.7 |
0 - 5
|
PPS
|
FKM |
|
BU-
20037617
|
2/2 NC |
0.8 mm
|
1/4-28 UNF |
0.01 |
0.012 |
10.7 |
0 - 5 |
PPS |
EPDM |
| BU-20071048 |
2/2 NC |
1.2 mm |
Bürkert sub-base (9 x 26) |
0.026 |
0.03 |
28 |
0 - 3 |
PPS |
FKM |
| BU-20037618 |
2/2 NC |
1.2 mm |
Bürkert sub-base (9 x 26) |
0.026 |
0.03 |
28 |
0 - 3 |
PPS |
EPDM |
| BU-20071231 |
2/2 NC |
0.8 mm |
Tube connector |
0.01 |
0.012 |
10.7 |
0 - 5 |
PEEK |
FFKM |
| BU-20071233 |
2/2 NC |
0.8 mm |
Tube connector |
0.01 |
0.012
|
10.7
|
0 - 5
|
PEEK
|
EPDM
|
| Previous reference |
New reference |
| BU-20071045 |
BU-20034162 |
| BU-299246 |
BU-20071068 |
Specifications
Dimensions of the Bürkert flange version (left) and 1/4-28 UNF version (right)
| Body material |
PEEK or PPS |
| Seal material |
FFKM, KFM or EPDM |
| Media temperature |
FFKM 15 °C to 50 °C
FKM 0°C to 50°C
EPDM 0°C to 50°C"
|
| Typical service life |
10.000.000 |
| Internal volume |
Bürkert sub-base (9 x 26): approx. 38 µl
Threaded version UNF ¼"- 28: approx. 59 µl
Tube connector: approx. 68 µl
|
| Viscosity |
Max. 21 mm²/s
|
| Port connection |
Bürkert flange (9 x 26) or Threaded version UNF ¼"- 28 or Tube connector
|
| Electrical connection |
Plug Raster 2 mm (socket with flying leads available)
|
| Power supply |
24 V DC
|
| Voltage tolerance |
+/- 10% |
| Power consumption |
1 W |
| Duty cycle |
100% continuous operation |
| Installation |
As required, preferably with actuator upright |
| Protection class |
IP40 acc. IEC 60144 |
| Response times (measured at valve outlet with air at 3 bar and +20 °C) |
Measurement at valve output with 2 bar and 20 °C acc. to DIN ISO 12238:2001
- Opening: 3 ms (pressure rise 0 to 10%)
- Closing: 3 ms (pressure drop 100 to 90%)
|
| Switching frequency |
- |
| Switching noise |
30 dB(A) |
| Approvals and compliance (on request) |
- Suitable for food industry: FDA
- Suitable for drinking water: KTW (W270)
- Oxygen application: BAM
|
Documentation
?Bürkert 6724 whisper valve datasheet
