费斯托德国快排阀功能描述，QST-8

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Temperature of medium [°C] –20 … +80 –10 … +60 

Higher piston speeds can be achieved on the return stroke of single 

and double-acting drives with the quick exhaust valves VBQF.

 Compressed air flows from the control valve via the VBQF to the drive. The

exhaust port 3 is closed at this time.

 When the pressure at 1 falls, exhaust flow occurs from 2 to 3. 

In order to implement a quick exhaust, the VBQF must be attached directly to

the supply port of the drive. The VBQF can be mounted in any position and can also be turned. 

The VBQF is available with or without silencer.

Pneumatic connection 2 (drive) G18 Thread Gx G14 Thread G?

Ducted exhaust air VBQF-D Pneumatic connection 2

 (drive) Gx G? Gx G? Pneumatic connection 1 (valve) Gx QS-6 G? QS-8 Gx 

QS-6 G? Pneumatic connection 3 (exhaust air) 

Transport andstorage protection. Partsthat donot have primarilydecorative surface requirements,e.g.

 in internal areasthat are not visible orbehindcovers.

Housing Die-cast zinc, die-cast aluminium Seals NBR Note on materials RoHS-compliant

Unducted exhaust air Gx Gx – 350 – 1,300 84.2 547531 

 Note on operating/pilot medium Operation with lubricated medium possible 

(in which case lubricated operation will always be required)

 Ambient temperature [°C] –20 … +80 –10 … +60 

– 960 – 2,500 226 548001 VBQF-U-G14-E QS-8 – 800 – 2,500 232 548002 VBQF-U-G14-Q8

Corrosion resistance class CRC1) 1

1) Corrosion resistance class1 according to

Festostandard940 070 Componentssubject tolow corrosion stress. 

? Can be rotated (continuous rotation of the connection must, however, be avoided)

VBQF Quick exhaust valve, flat design

U Unducted exhaust air D Ducted exhaust air

G? G? G? 960 1,500 2,500 253 548003 VBQF-D-G14-E

Pneumatic connection 1 (valve)

E Threaded connection, like pneumatic connection 2 

(drive) Q6 Push-in connector QS-6 Q8 Push-in connector QS-8

General technical data Exhaust air Unducted exhaust air VBQF-U 

Ducted exhaust air Gx Gx Gx 350 850 1,300 102.5

 547533 VBQF-D-G18-E QS-6 QS-8 350 850 1,300 105 547534 VBQF-D-G18-Q6 

Features: ? Minimal height ? High flow rate

VBQF-U-G18-E QS-6 – 350 – 1,300 85.5 547532 VBQF-U-G18-Q6 G? G? 

? Improved noise emissions

–(silencer) –(silencer) Gx QS-8 G? Valvefunction Quick exhaust Nominal size [mm] 5 7 5 7 

Type of mounting Screw-in Mountingposition Any Noise level [dB (A)] 75 75 – –

Operating and environmental conditions Type of connection Threaded connection Push-in connector QS

Operating pressure [bar] 0.5 … 10 Operating

 medium Compressed air in accordance with ISO 8573-1:2010 [7:4:4]

费斯托德国快排阀功能描述，QST-8