Troubleshooting - Festo VAPB Serie Instrucciones De Utilizacion

· Before installation, execute a performance 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−ro
tary 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.
The piping connectors of the ball valves have a female thread to DIN 2999 and
must be bolted to the tubing with appropriate fittings.
· Use appropriate sealing material on the pipe connections.
· Screw the pipelines into the connecting thread of the ball valve.
· Check the connection points for tightness.
8 Commissioning
· Make sure that the maximum 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 maximum limit values are always adhered to (è Technical
data). The maximum operating pressures are shown in the pressure−tempera
ture diagram (è Fig. 4).
The max. permissible operating pressure sinks as a function of the temperature of
the medium.
3
1
Connection Rp ¼ ... Rp 1¼
2
Connection Rp 1½ ... Rp 2½
Fig. 4: Pressure−temperature diagram
10 Maintenance and care
The ball valves VAPB are maintenance−free. For the sake of operational safety, it is
recommended to operate them at least once or twice every 3 weeks. This can pre
vent the break−away torque from rising and the gland nut from sticking to the
switch spindle.
Depending on the operating conditions, the ball valves and connection points
should be checked for tightness at regular intervals.
When the device is used in dust−laden environments, surfaces and actuators must
be cleaned regularly. The cleaning intervals depend on the amount of dust present
and on the surface temperature generated by the fluid.
11 Removal and repairs
Before dismantling:
· Completely relieve the pressure in the tubing and the process valve.
· Make sure that the process valve is completely drained.
Especially with harmful, combustible or explosive 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.
In this product execution, it is not possible to repair defective products. Defective
products must be replaced.
12 Accessories
· Please select the appropriate accessories from our catalogue www.festo.com/
catalogue
4
3
Max. permissible operating
pressure
4
Temperature of medium
13

Troubleshooting

Malfunction Possible cause
Leakage at the switch 1. Wear on the sealing elements on the
switching shaft
ing shaft
2. Incompatible medium in the ball valve
Leakage at the separ 1. Ball valve was screwed in too tight to
the pipe
ate halves of the hous
2. Bending moments on the ball valve too
ing
high
3. Incompatible medium in the ball valve
4. Temperature too high
5. Pressure too high
Leakage in the ball 1. Temperature too high
2. Pressure too high
valve through−hole
3. Incompatible medium in the ball valve
4. User fault: rotation < 90°
Fig. 5
14 Technical data
General technical data VAPB−... (Brass version)
VAPB
¼
Connection of process valve
Rp
Nominal size (DN) [mm] 15
è Type code Fig. 2
Connection of process valve
Rp
Type of mounting In−line installation
Mounting position Any
Direction of flow Reversible
Operating medium Water
Neutral fluids (pH value 7.0)
Neutral gases (inert gases zero−valent, non−aggressive
gases)
Compressed air
Actuation type Mechanical
Switching position display Slot direction = flow direction
Sealing principle Soft
Flange hole pattern è Type code Fig. 2
Constructional design 2−way ball valve
Temperature [°C] 20 ... +150; è Fig. 4
of medium
Process valve nomi PN 40 è Fig. 4
nal pressure
Information on materials
Housing Brass, nickel−plated; CW617N
Ball Brass, hard−chro
mium plated;
CW614N
Shaft Brass; CW614N
Shaft seal Polytetrafluoroethylene, hydrogenated nitrile rubber
Ball seal Polytetrafluoroethylene
1)
CE marking (see declaration of No
conformity)
1) Per 97/23/EG, article 3, sec. 3
2) Valid only for product versions with a nominal size of DN › 50 mm
Fig. 6
VAPB−... Break−away torque
[Nm]
(Brass version)
2)
0 bar 10 bar
VAPB 1/4 F 40 F03 3.1 3.5
VAPB 3/8 F 40 F03
VAPB 1/2 F 40 F03
VAPB 3/4 F 40 F03 4.6 5.1
VAPB 1 F 40 F0304 6.5 7.2
VAPB 1 1/4 F 40 F0405 10.8 11.9
VAPB 1 1/2 F 25 F0405 13.5 14.9
VAPB 2 F 25 F05 20 22
VAPB 2 1/2 F 25 F07 30 33
1) Necessary torque to overcome static friction, pressure−dependent, particularly after a relatively long
rest.
2) Break−away torque at a differential pressure of 0 bar
3) Break−away torque at a differential pressure of 10 bar
4) Break−away torque at differential pressure PN
5) Flow rate of water at 15 °C and at a p of 1 bar, measured per VDI/VDE 2173
Fig. 7
Remedy
· Replace ball valve
· Replace ball valve
· Replace ball valve
y
½ ¾ 1 1 ¼ 1 ½
20 25 32 40
PN 25 è Fig. 4
Brass, hard−chromium plated;
CW617N
1)
Flow Nominal
rate Kv size (DN)
3) 4) 5)
PN [m3/h] [mm]
5 5.9 15
9.4
17
6 41 20
8.5 70 25
15 121 32
19 200 40
29 292 50
45 535 63
2 2 ½
50 63
Yes, per EU
Directive on
Pressure
2)
Equipment
Product
weight
[g]
500
400
500
800
1300
1900
3100