background image

7

Mounting

Assembly and operation only by trained, qualified personnel.

Warning

Danger of crushing! Danger of shearing!
During operation of the ball valve, body parts can be crushed or cut in the orifice
of the ball valve.
  Do not reach into the orifice of the ball valve.

 Before installation, execute a function test.
The ball valve must be able to be put correctly into the end position. Ball valves
with detectable operative malfunctions must 

not

 be installed.

 Ensure that the equipment is free of stress during installation.
 When mounting a semi-rotary drive, observe the documentation for the semi-

rotary drive.

 Avoid additional piping connector forces.
The ball valve construction takes typical stress in operation within the tubing into
consideration. Longitudinal or bending forces can occur in piping systems that are
subject to temperature fluctuations.
 Use appropriate mountings on the process valve to avoid such forces.

Information for product variants with a 'W' connection type (weld end):

1. To protect the seals in the middle section of the ball valve: Completely dismantle

both connecting flanges from the ball valve and weld on separately.

2. Allow the connecting flanges to cool down and reconnect the middle part, to­

gether with the seals, via the tie rods. When doing this make sure the seals are
clean.

3. Tighten the tie rods crosswise and check the connection points for tightness -

for tightening torques 

è

 Fig. 5

Information for product variants with a 'G' connection type (pipe thread):

The piping connectors of the ball valves have a female thread to EN 10226 and
must be bolted to the tubing with appropriate fittings.
Use appropriate sealing material on the pipe connections.
1. Screw the pipelines into the connecting thread of the ball valve and check the

connection points for tightness.

2. Tighten the tie rods crosswise and check the connection points for tightness -

for tightening torques 

è

 Fig. 5

Tightening torques Tie rod

VZBA-...-

¼"

y

"

½"

¾"

1"

1¼"

1½"

2"

2½"

3"

4"

[Nm]

10

21

41

70

72

Fig. 5

8

Commissioning

 Make sure that the permissible pressure range of the product is not exceeded

(

è

 Technical Data).

The actuating elements of the ball valves are harmonised to the maximum forces
of the shaft and ball. Changes to these components are impermissible and can
cause damage.

9

Operation

 Make sure that the permissible limit values are adhered to (

è

 Technical Data).

Permissible medium pressures are shown in the pressure-temperature diagram
(

è

 Fig. 6).

The permissible medium pressure sinks as a function of the temperature of the
medium.

1

2

1

Pressure p [bar]

2

Temperature of medium t [°C]

Fig. 6

Pressure–temperature diagram

10

Maintenance and care

The ball valves VZBA are maintenance-free. For the sake of operational safety, it is
recommended to operate them at least once or twice a year. Depending on the
operating conditions, the ball valves and connection points should be checked for
tightness at regular intervals.

11

Disassembly and repair

Due to the design of closed ball valves, residual fluid may be retained in the ball
passage.
Before dismantling:
 Completely relieve the pressure in the tubing and the process valve.
 Operate the ball valve to completely drain the ball passage.
Especially with harmful media, make sure:
 that no one is in front of the outlet orifice when it opens.
 the tubing is completely drained before disassembly, and it must be rinsed in

order to avoid risk from dangerous media.

Repair must be performed only by trained personnel using the set of wearing parts
from Festo. Information about spare parts and auxiliary means can be found at
www.festo.com/spareparts.

12

Troubleshooting

Malfunction

Possible cause

Remedy

Leakage at the switch­
ing shaft

Wear of the sealing elements (packing
gland) on the switching shaft

 Re-adjust the gland

nut (

è

Fig. 10)

Leakage at the separate
halves of the housing

The housing seal has been crushed
between one or both of the threaded
flanges when inserting the middle part

 Replace the housing

seals

1)

Leakage in the ball
valve through-hole

Ball seal damaged by solids in the medium

 Replace the ball

seals

1)

1)

Please refer to the spare parts catalogue on the Internet (

è

 www.festo.com/spareparts).

Fig. 7

13

Technical data

General data

VZBA-...-63-T-22-...-V4V4T

Process valve connection

è

 Type code Fig. 2

Type of mounting

In-line installation

Medium

– Compressed air as per ISO 8573-1:2010 [-:-:-]
– Inert gases
– Water - no water vapour
– Neutral fluids
– Other media on request

Actuation type

Mechanical

Sealing principle

Soft

Mounting position

Any

Flange hole pattern

è

 Type code Fig. 2

Design

2-way ball valve

Direction of flow

reversible

Temperature of medium

[°C] –10 ... +200

Process valve nominal
pressure (PN)

63

Materials

– Seals

PTFE, reinforced PTFE

– Housing

high-alloy stainless steel (1.4408)

– Ball, shaft

high-alloy stainless steel (1.4401/1.4408)

CE mark (see declaration of conformity 

è

 www.festo.com)

– VZBA-¼" to VZBA-1"

no, in accordance with EU Pressure Equipment Directive, art.3,
par.3

– VZBA-1¼" to VZBA-4"

yes, in accordance with EU Pressure Equipment Directive

Fig. 8

VZBA-...-63-T-22-...-V4V4T

Actuating
torque

Flow
rate Kv

I.D.

Nominal
size (DN)

Product
weight

[Nm] 

1)

[m

3

/h] 

2)

[mm] 

3)

[g]

...-

¼

"-...-63-T-22-F0304-V4V4T

6

7

10

8

650

...-

y

"-...-63-T-22-F0304-V4V4T

10

12

10

650

...-

½

"-...-63-T-22-F0304-V4V4T

10

19.4

16

15

650

...-

¾

"-...-63-T-22-F0304-V4V4T

14

45.6

20

20

850

...-1"-...-63-T-22-F0405-V4V4T

17

71.5

25

25

1250

...-1

¼

"-...-63-T-22-F0405-V4V4T

24

105

32

32

1850

...-1

½

"-...-63-T-22-F0507-V4V4T

29

170

38

40

2800

...-2"-...-63-T-22-F0507-V4V4T

44

275

50

50

4550

...-2

½

"-...-63-T-22-F0710-V4V4T

78

507

65

65

9200

...-3"-...-63-T-22-F0710-V4V4T

112

905

80

80

13950

...-4"-...-63-T-22-F10-V4V4T

140

1414

100

100

22300

1)

Torque required for actuation at PN; dependent on pressure, temperature and medium

2)

Flow rate of water at 15 °C and at a differential pressure of 1 bar, measured in accordance with 
VDI/VDE 2173

3)

Smallest flow diameter

Fig. 9

Tightening torques Gland nut

VZBA-...-

¼"

y

"

½"

¾"

1"

1¼"

1½"

2"

2½"

3"

4"

[Nm]

2,5

3,4

5,9

19,6

24,5

Fig. 10

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