Festo VZXA M Series Parts list manual

Angle seat valve with diaphragm actuator
VZXA-...-M
Festo AG & Co. KG
Ruiter Straße 82
73734 Esslingen
Germany
[phone]
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 èwww.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 èTechnical 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 èwww.festo.com/catalogue
– Spare parts èwww.festo.com/spareparts
4 Service
 Contact the regional Festo contact if you have technical questions
èwww.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 èChapter 2.
– Periodic tests (performance test) èChapter 12.
– Ambient conditions and additional technical specifications èChapter 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 Ti1 a
Confidence Level 1-á95 %
Hardware Fault Tolerance HFT 0
Lambda Dangerous ëD1,36 · 10-7 / h
Lambda Dangerous Undetected ëDU 1,36 · 10-7 /h
Mean Time To Dangerous Failure MTTFD7,37 . 106h
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

6 Product overview
6.1 Design
1
2
3
4
5
6
7
8
9
5
1Position indicator (èFig. 6)
2Pneumatic connection (2)
3Actuator housing
4Leakage hole
5Pipe connection;
Feed or forwarding (corresponding
to flow direction)
6Arrow for direction of flow
7Valve housing
8Actuator interface / angle seat
valve with spanner flat
9Pneumatic connection (4)
Fig. 3
6.2 Product variants and type code
Fig. 4 explains selected product characteristics that are necessary
to understand the instructions.
Description of the complete type code: èwww.festo.com/catalogue
Characteristic Value Description
Type VZXA Angle seat valve
Medium flow AOver valve seat - closing in the direction of medium
flow (for gaseous media)
BUnder valve seat - closing against the direction of me
dia flow (for gaseous and fluid media)
Connection type TS6, TS7, TS13 Line connection and connection standard èFig. 10
Temperature
of medium
M2 –10…+180 °C
M3 –30…+200 °C
Medium pressure 4 to 30 0…4 bar to 0…30 bar
Valve housing material V13 Stainless steel 1.4409
V14 Stainless steel ASTM A351-CF3M
Seat seal material TP PTFE modified
TPTFE
Actuator MDiaphragm actuator
Actuator size 90 90 mm
Control function Closed via spring force, NC
SOpened via spring force, NO
PR Closed via reduced spring force, NC
Fig. 4
6.3 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.
Flow over valve seat
The valve is closed by spring force with the medium flow.
– Medium pressure supports valve closing.
– The valve is opened with operating pressure.
– Only suitable for gaseous media, because use of incompressible media causes
pressure surges in the piping.
Flow under valve seat
The valve is closed by spring force or with operating pressure against the medium
flow.
– Medium pressure supports the valve opening.
– In certain constructions, medium pressure that is too high or operating pressure
that is too low can lead to the valve not completely closing.
Control function
Single-acting
Closed via spring force or through reduced
spring force (normally closed - NC)
Opened via spring force (normally open - NO)
Fig. 5
Position indicator
The pneumatic position indication shows the position of the actuator rod.
Indicator cylinder above Indicator cylinder below
Actuator rod retracted, valve opened Actuator rod extended, valve closed
Fig. 6
7 Transport and storage
 When shipping used products: comply with all legal requirements for handling
hazardous substances and transporting dangerous goods.
For return to Festo èChap. 2.
 Store the product in a cool, dry, UV- and corrosion-protected environment.
Ensure that storage times are kept to a minimum.

8 Mounting and installation
8.1 Installing the angle seat valve
Prerequisites
– The piping system is unpressurised and no medium flows in it
– Lines are clean
– The line ends are mounted
Clean valve
 Remove all transport packaging. The material used in the packaging has been
specifically chosen for its recyclability (exception: oil-impregnated paper =
residual waste).
Traces of residual grease may be evident on the product due to the production
process used.
 Clean the valve immediately before installation.
Warning
Risk of injury due to slipping or falling objects!
The angle seat valve can weigh up to 11.5 kg, depending on the product version.
Body parts can be crushed. In overhead installations, the result can be serious
head injuries.
 Angle seat valve with appropriate means of securing against falling or
slipping.
1. Bring the angle seat valve into the mounting position.
– Observe the flow direction. The permitted direction of flow is marked by an
arrow on the valve housing.
2. Connect the piping on the valve housing.
– Max. tightening torque èFig. 7.
3. Connect the line of the operating medium.
– Pneumatic connection (2): operating medium
– Pneumatic connection (4): exhaust port
4. For single-acting actuators: mount the silencer in the exhaust port or use
a tubing connection for guided exhaust air.
Connection size [”] 1 1¼ 1½ 22½
Max. tightening torque
pipe connection
[Nm] 350 450 540 620 750
Fig. 7
9 Commissioning
Warning
Risk of injury from manipulation in the area of the angle seat valve!
Limbs can be cut or severed.
 Place only the fully mounted angle seat valve in operation.
Prerequisites
– The valve is fully mounted and connected
Checking operating conditions
 Observe operating conditions and limits èTechnical data and product labelling.
 Check connection points for tightness.
 Check compatibility of the devices in the system for maximum pressure
(consider pressure peaks). If necessary, adjust the application parameters.
Placing valve in operation
1. Supply medium.
2. Slowly apply operating pressure to the valve. The operating pressure required
for reliable switching of the valve depends on the medium pressure
èFig. 12 to Fig. 17.
3. Function and direction control of the individual pneumatic actuators.
10 Operation
Danger
Risk of injury from touching hot surfaces!
Valve and actuator can become hot at high temperature of medium. Severe
burns are possible.
 Do not touch the angle seat valve during operation or immediately afterward.
 Comply with operating conditions.
 Comply with maintenance conditions èChap. 12.
After longer idle times:
 Actuate the valve several times and check for correct function.
11 Malfunctions
Malfunction Possible cause Remedy
Valve does not
close or closes
too slowly
VZXA-B: medium pressure is too high
or operating pressure too low
 Creating necessary differential
pressure èTechnical data.
 Adjust operating pressure.
Too many contaminants, or contamin
ants that are too large, in the medium
 Comply with operating condi
tions.
Valve does not
open or opens
too slowly
VZXA-A: operating pressure is too low
or medium pressure too high
 Adjust operating pressure or
medium pressure.
VZXA-B: operating pressure too low  Adjust operating pressure.
Medium leaking
from a leakage
hole
Seal cartridge defective  Replace seal cartridge
èSpare parts documentation.
Medium will not
let itself be
shut off
Seat seal defective  Replace seat seal
èSpare parts documentation.
Fig. 8
12 Maintenance
Danger
Risk of injury from touching hot surfaces!
Valve and actuator can become hot at high temperature of medium. Severe
burns are possible.
 Allow the angle seat valve to cool off before working on it.
 Check product regularly from the outside for leakage.
 Check function of the product regularly.
 Clean product regularly with commercial cleaners.
12.1 Proof Test
The proof test consists of turning the operating pressure off and back on.
 Perform the proof test annually.
During the proof test, the safety of the application must be ensured.
1. Switch off the operating pressure.
2. Check valve position.
èThe test is successful if the safe status is reached within the specified time.
For evaluation of the safe status èChapter5.2.
3. Slowly apply operating pressure to the valve.
èThe test is successful if the valve takes its original position again.
4. Check the valve externally (visual inspection).
èThe test is successful if no defect or leakage is detected.
5. Document test results.

13 Conversion
Danger
Risk of injury from items flying around!
If they are not secured well enough, parts under pressure can fly around and
injure people.
 Before exchanging wearing parts, depressurise the valve and piping.
1
2
1Spanner flats for counter holding 2SW46 Interface screw
Fig. 9
13.1 Remove the actuator from the valve housing – in built-in state
The actuator can be disassembled from the valve housing without having to re
move the valve from the piping.
1. Depressurise pipelines and let the valve cool off.
2. Secure the actuator from falling or slipping with appropriate means of securing.
3. Extend the actuator rod.
– With double-acting valves: pressurise connection (4) (3 bar).
– With valves with NO control function: pressurise connection (2) (3 bar).
– With valves with NC control function: exhaust the actuator.
4. Loosen interface screw (èFig. 9, 2).
5. Remove actuator from the valve housing.
6. Switch off the operating pressure.
13.2 Remove actuator from the valve housing – in removed state
1. Extend the actuator rod.
– With double-acting valves: pressurise connection (4) (3 bar).
– With valves with NO control function: pressurise connection (2) (3 bar).
– With valves with NC control function: exhaust the actuator.
2. Loosen interface screw (èFig. 9, 2).
3. Remove actuator from the valve housing.
4. Switch off the operating pressure.
13.3 Mount the valve housing onto the actuator
1. Extend the actuator rod.
– With double-acting valves: Pressurise connection (4) slowly (3bar).
– For valves with NO control function: Pressurise connection (2) slowly (3bar).
– With valves with NC control function: exhaust the actuator.
2. Slide spindle of the process valve completely into the process valve.
3. Place actuator onto valve housing.
4. Tighten interface screw (èFig. 9, 2).
– Tightening torque: 50 Nm
5. Switch off the operating pressure.
13.4 Turning the actuator
1. Loosen interface screw (max. ½turn) (èFig. 9, 2).
2. Turn the actuator into the desired position.
3. Tighten interface screw (èFig. 9, 2).
– Tightening torque: 50 Nm
14 Removal
Danger
Risk of injury from touching hot surfaces!
Valve and actuator can become hot at high temperature of medium. Severe
burns are possible.
 Allow the angle seat valve to cool off before working on it.
Danger
Risk of injury due to movement of pressurised parts!
The angle seat valve can switch if there is a drop in pressure. Limbs can be cut or
severed.
 Before removal, move the valve to the closed position.
 Before removal, depressurise the valve and the piping.
Warning
Risk of injury due to slipping or falling objects!
The angle seat valve can weigh up to 11.5 kg, depending on the product version.
Body parts can be crushed.
 Angle seat valve with appropriate means of securing against falling or
slipping.
1. Depressurise the piping and the operating medium connection line. Allow
the valve and piping to cool.
2. Empty the piping and valve completely.
 Make sure no one is located in front of the outlet opening.
 Catch discharging media in a suitable container.
3. Disconnect connection lines of the operating medium from the valve.
4. Loosen piping connectors.
5. Remove angle seat valve.
15 Disposal
 Observe the local regulations for environmentally friendly disposal.
 Dispose of the product in an environmentally friendly manner. When doing this,
also take residual media into account (potential recycling of hazardous waste).

16 Technical data
General VZXA-A-...-M-... VZXA-B-...-M-...
Design Poppet valve with diaphragm actuator
Mounting position Any
Type of mounting In-line installation
Valve function 2/2
Flow direction Non-reversible
Medium1) Compressed air grade of
filtration 200 μm, inert
gases, vapour
Compressed air grade of
filtration 200 μm, inert
gases, water, petroleum,
neutral liquid media,
petroleum based
hydraulic oil, vapour
Medium pressure [bar] 0…30, in accordance with the specification on the
rating plate
Viscosity [mm2/s] š600
Temperature of medium [°C]
Seat seal material: PTFE modified –30...+200
Seat seal material: PTFE –10...+180
Perm. min./max. temp (TS) [°C]
Seat seal material: PTFE modified –30...+200
Seat seal material: PTFE –10...+180
Ambient temperature [°C] 0…+60
Operating medium Compressed air in accordance with
ISO 8573-1:2010 [7:4:4]
Operating pressure [bar] Max. 7 (èFig. 12 to Fig. 17)
Degree of protection for actuator IP65, IP67,
IP67K (with guided exhaust air)
Valve housing connection
VZXA-...-TS6 Threaded collar in accordance with DIN ISO 228
VZXA-...-TS7 Threaded collar in accordance with
ANSI/ASME B 1.20.1
VZXA-...-TS13 Threaded collar in accordance with DIN 10226
Operating medium port GÁ
Note on materials
Valve housing VZXA-...-V13 Stainless steel casting (1.4409)
Valve housing VZXA-...-V14 Stainless steel casting (ASTM A351-CF3M)
Seat seal VZXA-...-TP PTFE modified
Seat seal VZXA-...-T PTFE
Actuator housing Stainless steel casting (1.4408)
Diaphragm actuator seals NBR
Actuator rod High-alloy stainless steel
Actuator cover Stainless steel casting (1.4408)
Product weight èwww.festo.com/catalogue
CE marking (see declaration of conformity
èwww.festo.com/sp)
According to EU Machinery Directive
1) Other media on request
Fig. 10
Nominal pressure, burst pressure and flow rate of process valve VZXA-...-TS…
Connection size [”] 1 1¼ 1½ 22½
Nominal width DN 25 32 40 50 65
Nominal pressure process valve PN
(up to 200 °C temperature of medium)
[bar] 40 25
Burst pressure
(up to 200 °C temperature of medium)
[bar] 200 125
Flow rate Kv1)
VZXA-B-...-90 [m3/ h] 23.6 33.1 49.0 60.4 77.9
VZXA-A-...-90 [m3/ h] 24.7 35.4 47.4 68.5 77.4
1) Water, at +20 °C, medium pressure 1 bar at the valve input, free outlet
Fig. 11
Medium pressure and operating pressure for valves with medium flow under
valve seat VZXA-B-...-M-90-...-S (Medium flow under valve seat, NO)
Nominal width DN 32 40 50 65
Max. medium pressure [bar] 16 12.2 5.8
Min. operating pressure [bar] 3.3 4.2 5
Fig. 12
Operating pressure [bar]
Medium pressure [bar]
DN32
DN40 DN50
DN65
Fig. 13
VZXA-B-...-M-90 (Medium flow under valve seat, NC)
Nominal width DN 25 32 40 50 65
Max. medium pressure [bar] 30 25 16 10 5.6
Min. operating pressure [bar] 5
Fig. 14
VZXA-B-...-M-90-...-PR
(Medium flow under valve seat, NC with reduced spring force)
Nominal width DN 25 32 40
Max. medium pressure [bar] 14.5 7.5 6
Min. operating pressure [bar] 2.1
Fig. 15
Medium pressure and operating pressure for valves with medium flow over
valve seat VZXA-A-...-M-90-...-PR
(Medium flow over valve seat, NC with reduced spring force)
Nominal width DN 32 40 50 65
Max. medium pressure [bar] 16 8
Min. operating pressure [bar] 2.4 34.4 5
Fig. 16
Operating pressure [bar]
Medium pressure [bar]
DN32
DN40
DN50
DN65
Fig. 17