•
•
Screw connection [3] to the pipe.
VZQA-C-M22U
-6
-15
-25
-50
VZQA-C-M22U-...-G/-T-...V4
VZQA-C-M22U-...-G/-T-...AL
[Nm]
15
35
40
40
VZQA-C-M22U-...-G/-T-...POM
[Nm]
–
8
10
–
For VZQA-C-M22U-...-S1/-S5/-S12 with clamping socket:
•
Close the clamp ferrule of the pipe and the clamp ferrule of the valve with the
seal together and tighten them with the clamp of the clamp seal.
5.3
Connecting the operating medium pipe
1. Mount a fitting on the port [4] for the operating medium.
VZQA-C-M22U
-6
-15
-25
-50
Max. screw-in depth
[mm]
4.5
5
6
8
2. Connect the pipe for the operating medium.
6
Commissioning
Requirements
–
Protective measures are installed in the system, e.g. flow control valves or
control valve, check valve, pressure-relief valve.
–
The valve is fully mounted and connected.
6.1
Checking operating conditions
1. Check the operating conditions and limit values
To ensure a long service life for the seal cartridge keep the pressure differ-
ence between the medium pressure and the operating pressure as low as
possible.
Use a throttle valve or a control valve
2. Check that the connections are tight.
3. Take into account the compatibility of the devices in the system for the max-
imum pressure and the pressure peaks. If necessary, adjust the application
parameters.
6.2
Commissioning the valve
WARNING
Risk of injury from combustion and chemical burns.
The valve only closes completely if the required differential pressure between the
medium pressure and the operating pressure is ensured. Otherwise, medium can
escape and injure people.
• Secure possible outlet points of the medium (e.g. line ends) to prevent any
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.
• Do not commission the valve until it is fully assembled.
1. Feed in flow medium.
2. Apply operating pressure to the valve.
Ä
The valve closes.
3. Actuate the valve several times, approx. 10 times.
7
Operation
WARNING
Risk of injury due to hot surface.
The valve can become hot if the temperature of the medium is high.
• Do not touch the valve during operation or immediately afterward.
1. Observe the operating conditions.
2. Comply with the permissible limit values.
3. Comply with maintenance conditions
4. Recommendation: switch the valve several times per day.
After longer idle times:
•
Actuate the valve several times and check that it functions correctly.
8
Maintenance
WARNING
Risk of injury from combustion and chemical burns.
The media in the piping system and the valve can be hot and under pressure.
Traces of medium can remain in the product and can escape when open or
dismantled.
• Allow the valve and piping to cool and depressurize them.
• Wear specified protective equipment.
8.1
Checking and cleaning the valve
•
Inspect the valve regularly from the outside for leakage and function.
•
Clean the valve regularly.
8.2
Checking and replacing the seal cartridge
NOTICE
The seal cartridge may only be changed by qualified technicians in accordance
with the assembly instructions
The seal cartridge is subjected to mechanical loads and ageing. A damaged or
worn seal cartridge results in leakage.
•
Check the seals and seal cartridge regularly and replace if necessary. The
intervals depend on the medium.
•
Replace seal cartridge and seals if they are damaged. Use a seal cartridge
with the same specification.
Replace the seal cartridge at the specified interval:
–
VZQA-C-M22U-6/-15/-25: maximum 0.5 million switching cycles.
–
VZQA-C-M22U-50: maximum 300000 switching cycles.
9
Fault clearance
Malfunction
Cause
Remedy
Valve does not close or closes
too slowly
Medium pressure is too high or
operating pressure too low
–
Set differential pressure
to min. 0.25 MPa (2.5
bar, 36.25 psi) by
increasing operating pres-
sure or reducing pressure of
medium
Too many or too large contami-
nants in the medium
Valve clogged
–
Clean the valve or replace
the seal cartridge
Operating medium port
blocked
–
Clean or replace the oper-
ating medium port
Seal cartridge faulty
–
Replace seal cartridge
Valve does not open or opens
too slowly
Medium pressure too low
–
Increase medium pressure
Shut-off element is stuck
together because the material
of the shut-off element is not
suited for the medium
–
Replace product with a
product variant made of
appropriate materials
Operating pressure is still
present
–
Shut off operating pressure
Leakage
Seal cartridge faulty
–
Replace seal cartridge
Tab. 3: Fault clearance
10
Removal
WARNING
Risk of injury from combustion and chemical burns.
The media in the piping system and the valve can be hot and under pressure.
Traces of medium can remain in the product and can escape when open or
dismantled.
• Allow the valve and piping to cool and depressurize them.
• Wear specified protective equipment.
1. De-pressurise the piping and the operating medium piping.
2. Allow the valve and piping to cool.
3. Drain the piping and valve completely.
• Make sure no one is located in front of the outlet opening.
• Collect the outflowing flow medium in a suitable container.
4. Disconnect the operating medium line from the valve.
5. Disconnect the piping connections and remove the valve.
