5
Installation
Note
Installation should only be conducted by qualified specialized personnel.
Do not reach into the opening of the valve.
Requirements
– The piping system is unpressurised, and no medium flows in it.
– The lines are clean.
– The line ends are mounted.
– The system-provided safeguardings are installed (e.g. throttle valve or control
valve, non-return valve, pressure relief valve).
VZQA-C-M22U-...
-6
-15
-25
Throttle valve /
control valve
Standard nominal flow rate (recommended) [l/min]
10
40
40
Nominal width (recommended)
[mm]
0.5
1
1
Fig. 4
Clean valve
Remove all transport packaging. The material used in the packaging has been
specifically chosen for its recyclability (exception: oil-impregnated paper = re
sidual waste).
Residues of grease may be evident on the product due to the production process
used.
Clean valve immediately before installation.
Connect medium lines
Note
To eliminate direct access to the valve opening during operation, connect a line
to both ports, even if the valve is located at the end of the piping.
For product variants with female thread:
Screw the valve connections to the medium line.
– Tightening torque
è
Fig. 8.
For product variants with clamp:
Place the clamp ferrule of the line and the clamp ferrule of the valve with the
seal against each other and tighten them with the bracket of the clamp seal.
Connect the line of the operating medium
1. Mount an appropriate fitting to the operating medium connection.
– Max. permissible screw-in depth
è
Fig. 5.
2. Connect the line of the operating medium.
VZQA-C-M22U-...
-6
-15
-25
Max. permissible screw-in depth of pilot air connection
[mm]
4.5
5
6
Fig. 5
6
Commissioning
Note
Commissioning should only be conducted by qualified personnel.
Requirements
– The system-provided safeguardings are installed (e.g. throttle valve or control
valve, non-return valve, pressure relief valve).
– The valve is fully mounted and connected.
Check operating conditions
Check operating conditions and limit values (
è
Technical data).
– For a long service life of the seal cartridge, keep the differential pressure
between the medium pressure and the operating pressure (differential pres
sure) as low as possible. Use throttle valve or control valve (
è
Fig. 4).
Check connection points for tightness.
Check compatibility of the devices in the system for maximum pressure (con
sider pressure peaks). If necessary, adjust the application parameters.
Placing valve in operation
Warning
Risk of injury from combustion and chemical burns.
If the required differential pressure between the medium pressure and the oper
ating pressure is not reached, the valve will not close completely. Medium can
exit and injure people.
Secure possible medium exit points (e.g. line ends) so that nobody can come
into contact with the medium.
Wear specified protective equipment.
Caution
Risk of crushing inside the valve!
The shut-off element inside the valve closes with great force. Fingers can be
crushed.
Do not reach inside the valve.
Place only the fully assembled valve in operation.
1. Supply medium.
2. Apply operating pressure to the valve.
3. Actuate the valve several times (approx. 10 times).
7
Operation
Warning
Risk of injury due to hot surface!
The valve can become hot at high media temperature.
Do not touch the valve during operation or immediately afterward.
Observe the operating conditions.
Observe permitted limit values.
Comply with maintenance conditions (
è
Maintenance and care).
Recommendation: Switch valve several times per day.
After longer standstills:
Actuate the valve several times (approx. 10 times).
Check proper function
8
Maintenance and care
Warning
Risk of injury from combustion and chemical burns.
The media in the piping system and the valve can be hot and under pressure.
Medium residues can be in the product and escape when open or dismantled.
Allow the valve and piping to cool and depressurize them.
Wear specified protective equipment.
Check and clean valve
Check product regularly from the outside for leakage and function.
Clean product regularly.
Check and replace seal cartridge
Note
Seal cartridge may only be changed by qualified personnel following the mount
ing instructions (
è
Mounting instructions for seal cartridge).
The seal cartridge is subjected to mechanical loads and ageing. If the seal cart
ridge is damaged or worn, the valve no longer closes completely.
Check and replace seals and seal cartridge regularly (intervals dependent on the
medium).
Replace seal cartridge and seals if they are damaged. Use a seal cartridge with
the same specification.
Replacement interval of the seal cartridge: max. ½ million switching cycles.