Festo VZQA-C-M22U User manual

VZQA-C-M22U
Pinch valve
Festo SE & Co. KG
Ruiter Straße 82
73734 Esslingen
Deutschland
[phone]
www.festo.com
Operating instruction
8179536
2022-09h
[8179538]
Translation of the original instructions
© 2022 all rights reserved to Festo SE & Co. KG
1Applicable documents
All available documents for the product è www.festo.com/sp.
Document Product Table of contents
Assembly instructions Seal cartridge VAVC-Q2-M22U Changing the seal cartridge
Tab. 1: Applicable documents
2Safety
2.1 Safety instructions
–Only use the product in its original condition without unauthorised modifica-
tions.
–Only use the product if it is in perfect technical condition.
–Take into account the ambient conditions at the location of use.
–Observe the specifications on the product labelling.
–Store the product in a cool, dry environment protected from UV and corrosion.
Keep storage times short. Storage temperature è 11 Technical data.
Media
–Use only media in accordance with the specifications è 11 Technical data.
–Use only media to which the materials used for the seal cartridge and cover are
resistant. For evaluation of the media resistance è www.festo.com.
–Use only media that will not cause dangerous reactions if mixed.
Piping
Depending on the flow medium and the operating conditions, pressure peaks that
exceed the permissible pressure range may develop in the system.
If the seal cartridge fails, the operating medium may enter the flow media circuit.
The pressure in the flow medium circuit may increase accordingly.
–Design the flow media circuit for at least the set operating pressure.
–It may be necessary to include a pressure-relief valve in the media line to
comply with the limit values.
The separation between the media spaces is no longer guaranteed if wear causes
the seal cartridge to leak. The flow medium may then enter into the pilot circuit
and escape, e.g. at a silencer.
–Use an appropriate check valve to protect the pilot circuit against ingress of the
flow medium.
–Secure possible outlet points of the medium in such a way that persons cannot
come into contact with the medium.
The service life of the seal cartridge depends on the medium used, the operating
pressure and the switching speed.
–Limit the switching speed with a suitable throttle valve or control valve.
Very high temperatures may damage the seal cartridge è 11 Technical data.
–Do not weld piping in close proximity to the valve.
Return to Festo
Hazardous substances can endanger the health and safety of persons and cause
damage to the environment. To prevent hazards, the product should only be
returned if explicitly requested by Festo.
–Consult your regional Festo contact.
–Complete the declaration of contamination and attach it to the outside of the
packaging.
–Comply with all legal requirements for the handling of hazardous substances
and the transport of dangerous goods.
2.2 Intended use
The pinch valve controls gaseous, dusty and solid media as well as mixtures of
substances in piping systems.
The pinch valve VZQA-C-M22U-...-...S1 can be used in the food zone.
2.3 Training of qualified personnel
Work on the product may only be carried out by qualified personnel who can
evaluate the work and detect dangers. The qualified personnel have knowledge
and experience in process automation.
3 Additional information
–Contact the regional Festo contact if you have technical problems
è www.festo.com.
–Accessories è www.festo.com/catalogue.
4 Product overview
4.1 Product design
1
2
3
4
Fig. 1: Product design
1Housing cover
2Housing
3Threaded connection or clamp
ferrule for connecting media-car-
rying piping
4Operating medium port
Inside the valve is a replaceable seal cartridge with a tubular shut-off element.
4.2 Function
The pinch valve is a pneumatically actuated 2/2-way valve. In its normal position
the valve is open (N/O).
Fig. 2: Circuit symbol
If the valve is pressurised with operating pressure, the tubular shut-off element
is pinched shut and the valve is closed. After removal of the operating pressure,
the shut-off element is opened by its intrinsic tension and the pressure of the
medium. The free passage when the valve is opened ensures minimum flow
resistance and prevents the valve becoming blocked or clogged.
5Mounting
Requirements
–The piping system is unpressurised and medium is not flowing through it.
–The lines are clean.
–The pipe ends are mounted.
–All transport packaging has been removed. The material used in the packaging
has been specifically chosen for its recyclability.
–Protective measures are installed in the system, e.g. flow control valves or
control valve, check valve, pressure-relief valve.
VZQA-C-M22U -6 -15 -25 -50
Flow control
valve,
control valve
Recommended standard
nominal flow rate
[l/min] 10 40 40 40
Recommended nominal
width
[mm] 0.5 1 1 1
Tab. 2: Mounting
5.1 Cleaning the valve
• There may be traces of residual grease on the valve as a result of the produc-
tion process. Clean the valve immediately before mounting.
5.2 Connecting the flow medium pipe
NOTICE
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 VZQA-C-M22U-...-G/-T with female thread:

•
• 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.
6Commissioning
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 è 11 Technical data.
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 è 5 Mounting.
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.
ÄThe 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 è 8 Maintenance.
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 è 1 Applicable documents.
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.
9Fault 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.

11 Technical data
VZQA-C-M22U -6 -15 -25 -50
Design Pinch valve, pneumatically actuated
Nominal width DN 6 15 25 50
Actuation type Pneumatic
Sealing principle Soft
Mounting position Any
Type of mounting In-line installation
Valve function 2/2, open, monostable
Flow direction Reversible
Reset method Rebound resilience
Type of control Externally controlled
Switching time on [ms] 125 250 250 200
Flow rate Kv1) [m3/h] 0.7 5 18 72
Switching time off [ms] 125 250 250 1000
Pressure of medium [MPa] 0 … 0.4 0 … 0.2
[bar] 0 … 4 0 … 2
[psi] 0 … 58 0 … 29
Operating pressure [MPa] 0.1 … 0.65 0 … 0.45
[bar] 1 … 6.5 0 … 4.5
[psi] 14.5 … 94.25 0 … 65.25
Burst pressure [MPa] 1.6
[bar] 16
[psi] 232
Nominal pressure PN of
process valve
10
Ambient temperature [°C] –5 … +60
Product weight è www.festo.com/catalogue
Max. viscosity [mm2/s] 4000
Differential pressure
VZQA-C-M22U-...-...N [MPa] 0.25 –
[bar] 2.5 –
[psi] 36.25 –
VZQA-C-M22U-...-...E [MPa] 0.25
[bar] 2.5
[psi] 36.25
VZQA-C-M22U-...-...S1 [MPa] 0.25 0.30 –
[bar] 2.5 3 –
[psi] 36.25 43.5 –
Operating medium
VZQA-C-M22U-...-...N Compressed air in accordance with ISO
8573-1:2010 [7:4:4]
–
VZQA-C-M22U-...-...E Compressed air in accordance with ISO 8573-1:2010
[7:4:1]
VZQA-C-M22U-...-...S1 Compressed air in accordance with ISO
8573-1:2010 [7:4:4]
–
Medium
VZQA-C-M22U-...-...N Compressed air in accordance with ISO
8573-1:2010 [–:–:–]
–
VZQA-C-M22U-...-...E Compressed air in accordance with ISO 8573-1:2010
[–:–:1], water
VZQA-C-M22U-...-...S1 Compressed air in accordance with ISO
8573-1:2010 [–:–:–]
–
Food-safe
VZQA-C-M22U-...-...E Supplementary material information è www.festo.com
VZQA-C-M22U-...-...S1 Yes, declaration of conformity
è www.festo.com
–
Temperature of medium
VZQA-C-M22U-...-...N [°C] –5 … +60 –
VZQA-C-M22U-...-...V4E [°C] –5 … +100
VZQA-C-M22U-...-...ALE [°C] –5 … +100
VZQA-C-M22U-...-...POME [°C] –5 … +80
VZQA-C-M22U-...-...V4S1 [°C] –5 … +150 –
VZQA-C-M22U-...-...ALS1 [°C] –5 … +150 –
VZQA-C-M22U-...-...POMS1 [°C] –5 … +80 –
VZQA-C-M22U-…-V4V4E-4-
EXA
[°C] –5 … +90 –
Storage temperature
VZQA-C-M22U-...-...N [°C] 6 … 8 –
VZQA-C-M22U-...-...E [°C] 6 … 8 5 … 25
VZQA-C-M22U-...-...S1 [°C] 5 … 30 –
VZQA-C-M22U-…-V4V4E-4-
EXA
[°C] 6 … 8 –
Angle seat fitting connection
VZQA-C-M22U-...-G G 1/4 G 1/2 G 1 G 2
VZQA-C-M22U-...-T 1/4 NPT 1/2 NPT 1 NPT 2 NPT
VZQA-C-M22U -6 -15 -25 -50
VZQA-C-M22U-...-S1 Clamp ferrule in accordance with
ASME BPE, type A
–
VZQA-C-M22U-...-S5 Clamp ferrule in accordance with DIN 32676-A
VZQA-C-M22U-...-S12 – Clamp ferrule in accordance
with ASME BPE, type B
Operating medium port M5 G 1/8
Housing material
VZQA-C-M22U-...-V... High-alloy stainless steel
VZQA-C-M22U-...-AL Wrought aluminium alloy
Housing cover material
VZQA-C-M22U-...-...V4 High-alloy stainless steel
VZQA-C-M22U-...-...AL Wrought aluminium alloy
VZQA-C-M22U-...-...POM POM –
Seal material FPM VMQ
Shut-off element material
VZQA-C-M22U-...-...N NBR –
VZQA-C-M22U-...-...E EPDM
VZQA-C-M22U-...-...S1 Silicone –
1) At +20 °C, pressure of medium 0.1 MPa at the valve inlet, free outlet
Tab. 4: Technical data