Festo VZXA-***-M Series Manuals

Angle seat valve with diaphragm actuator
VZXA-...-M
Festo AG & Co. KG
Postfach
73726 Esslingen
Germany
+49 711 347-0
www.festo.com
Instructions for use
8065302
1609
[8065305]
Original: de
Angle seat valve with diaphragm actuator VZXA-...-M
English
. . . . . . . . . . . . . . . .
1
About this document
This document describes the use of the above-mentioned product. Certain aspects
of use are described in other documents and must be observed
� Applicable documents.
1.1 Applicable documents
All available documents for the product � www.festo.com/pk
1.2 Product labelling
Scanning the printed Data Matrix Code with an appropriate device calls up the
Festo Support Portal, with information appropriate for the product. Alternatively,
the product key (11-digit alphanumeric code or product label) can be entered in
the search field of the Support Portal.
2
Safety
2.1 Intended use
The angle seat valve VZXA-...-M is intended to shut-off gaseous or liquid media in
piping systems.
� To control liquid media, use only the product variant VZXA-B... (media flow under
valve seat).
2.2 General safety information
� The product may only be used in its original status without unauthorized modi­
fications.
� Observe all applicable national and international regulations.
� Use the valve only in the flow direction indicated.
� Only use the product if it is in perfect technical condition.
� Take into consideration the ambient conditions at the location of use.
Media
� Only use media in accordance with specifications � Technical data.
� Use only media that will not cause dangerous reactions if mixed.
� Do not operate the product with chemically unstable gases, abrasive media
or solid materials.
� If water is used: up to approx. 1000 ppm of chloride content is permitted.
Avoid tensile stresses.
� If aggressive media are used: limit medium temperature to 65 °C.
Actuator
� Do not open the actuator (pressure in the actuator or loaded spring).
� Avoid mechanical stresses on the valve. Do not use the actuator as a lever.
Return to Festo
Hazardous substances can endanger the health and safety of personnel and cause
damage to the environment. To prevent hazards, the product should only be re­
turned upon explicit request 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 handling hazardous substances and
transporting dangerous goods.
3
Further information
– Accessories � www.festo.com/catalogue
– Spare parts � www.festo.com/spareparts
– Documents and literature � www.festo.com/sp
4
Service
� Contact the regional Festo contact if you have technical questions
� www.festo.com.
5
Product overview
5.1 Design
1
2
3
4
5
6
7
8
9
5
1
Position indicator (� Fig. 4)
2
Pneumatic connection (2)
3
Actuator housing
4
Leakage hole
5
Pipe connection;
Feed or forwarding (corresponding
to flow direction)
6
Arrow for direction of flow
7
Valve housing
8
Actuator interface / angle seat
valve with spanner flat
9
Pneumatic connection (4)
Fig. 1
5.2 Product variants and type code
Fig. 2 explains selected product characteristics that are necessary
to understand the instructions.
Description of the complete type code: � www.festo.com/catalogue
Characteristic
Value
Description
Type
VZXA
Angle seat valve
Medium flow
A
Over valve seat - closing in the direction of medium flow
(for gaseous media)
B
Under valve seat - closing against the direction of media
flow (for gaseous and fluid media)
Connection type
T
Threaded collar
Temperature
of medium
M2
–10…+180 °C
Medium pressure
4 to 30
0…4 bar to 0…30 bar
Actuator
M
Diaphragm actuator
Actuator size
90
90 mm
Control function
Closed via spring force, NC
S
Opened via spring force, NO
PR
Closed via reduced spring force, NC
Fig. 2
5.3 Function
The angle seat valve VZXA-...-M is an externally controlled 2/2-directional control
valve with diaphragm actuator. The valve seat is slanted around 40° toward the
medium flow.
To close the valve, the valve actuator using the actuator rod presses the valve disc
into the valve seat in a force fit.
The supply of the operating medium is controlled by an external valve (usually
electrically controlled) that must be additionally integrated into the supply line for
the actuator.
The actuator can be rotated 360° on the valve housing.

Angle seat valve with diaphragm actuator
VZXA-...-M
Festo AG & Co. KG
Ruiter Straße 82
73734 Esslingen
Germany
+49 711 347-0
www.festo.com
Instructions | Operating
(Translation of the original instructions)
8082926
2018-02a
[8082928]
Angle seat valve with diaphragm actuator VZXA-...-M
English
. . . . . . . . . . . . . . . .
1
About this document
This document describes the use of the above-mentioned product. It contains
additional information for the implementation of the product in safety-oriented
systems (safety handbook in accordance with IEC 61508).
For all available product documentation  www.festo.com/pk
1.1 Specified standards
Version status
IEC 61508-1:2010 part 1, 2, 4…7
IEC 61511:2016
Fig. 1
2
Safety
2.1 General safety information
 The product may only be used in its original status without unauthorized modi­
fications.
 Use the valve only in the flow direction indicated.
 Only use the product if it is in perfect technical condition.
 Take into consideration the ambient conditions at the location of use.
Media
 Only use media in accordance with specifications  Technical data.
 Use only media that will not cause dangerous reactions if mixed.
 Do not operate the product with chemically unstable gases, abrasive media
or solid materials.
 If water is used: up to approx. 1000 ppm of chloride content is permitted.
Avoid tensile stresses.
 If aggressive media are used: limit medium temperature to 65 °C.
Actuator
 Do not open the actuator (pressure in the actuator or loaded spring).
 Avoid mechanical stresses on the valve. Do not use the actuator as a lever.
Return to Festo
Hazardous substances can endanger the health and safety of personnel and cause
damage to the environment. To prevent hazards, the product should only be re­
turned upon explicit request 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 handling hazardous substances and
transporting dangerous goods.
2.2 Intended use
The angle seat valve VZXA-...-M is intended to shut-off gaseous or liquid media in
piping systems.
 To control liquid media, use only the product variant VZXA-B... (media flow under
valve seat).
2.3 Training of specialized personnel
Work on the product should only be conducted by qualified personnel. The quali­
fied personnel must be familiar with installation of process automation systems.
3
Further information
– Accessories  www.festo.com/catalogue
– Spare parts  www.festo.com/spareparts
4
Service
 Contact the regional Festo contact if you have technical questions
 www.festo.com.
5
Information on functional safety
5.1 Attainable safety rating
The product is suitable for use as an element in a safety-related system in accord­
ance with IEC 61511.
– In low-demand mode up to SIL 2
– In high-demand mode up to SIL 2.
Taking into account the necessary minimum hardware fault tolerance from HFT = 1,
the product can also be used up to SIL 3 with a redundant design of the entire system.
Note
The suitability for certain applications can only be determined in connection with
the evaluation of further components of the subsystem.
5.2 Safety function
Single-acting valves
The safety function consists of taking the initial position on request. The request is
made by removing the operating pressure.
– Valves with control function NO: The valve opens completely and remains open
until operating pressure is applied.
– Valves with control function NC: The valve closes completely and remains closed
until operating pressure is applied.
Double-acting valves
The safety function consists of taking the desired position on request. Supply of
external energy is required for this.
5.3 Operating conditions
– General notes on safe operation  Chapter 2.
– Periodic tests (performance test)  Chapter 12.
– Ambient conditions and additional technical specifications  Chapter 16.
5.4 Limitations of application
The service life is not limited if the operating conditions are complied with.
– Maximum admissible interval for a complete performance test: seven years.
5.5 Characteristic values
Safety standards (in accordance with IEC 61508)
Value
Route of assessment
2H / 1S
Type of Sub System
Type A
Mode of Operation
Low Demand and
High Demand
Assumed Test Interval
Ti
1 a
Confidence Level
1-á
95 %
Hardware Fault Tolerance
HFT
0
Lambda Dangerous
ëD
1,36 · 10-7 / h
Lambda Dangerous Undetected
ëDU
1,36 · 10-7 /h
Mean Time To Dangerous Failure
MTTFD
7,37 . 106 h
Proof Test Coverage
PTC
95 %
Low Demand Mode
Assumed Demands per Year
nop
1 / a
Average Probability of Failure on Demand
PFDavg
5,95 · 10-4
High Demand Mode
Assumed Demands per Year
nop
1 / h
(8760 / a)
Probability of dangerous Failure per Hour
PFH
1,36 · 10-7 / h
Fig. 2