Festo VZXA Series User manual

VZXA-...-C.../W...-...-K-46-...-PM
Angle seat valve with piston actuator
Festo SE & Co. KG
Ruiter Straße 82
73734 Esslingen
Deutschland
[phone]
www.festo.com
Operating instructions
8155431
2021-07
[8155433]
Translation of the original instructions
© 2021 all rights reserved to Festo SE & Co. KG
1About this document
1.1 Applicable Documents
All available documents for the product è www.festo.com/sp.
2 Safety
2.1 General safety instructions
–Only use the product in original status without unauthorised modifications.
–Only use the product if it is in perfect technical condition.
–Use the valve only in the flow direction indicated.
–Take into consideration the ambient conditions at the location of use.
Media
–Use only media in accordance with the specifications è 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.
–When using saturated water vapour: take vapour pressure into account when
designing the valve.
–If aggressive media are used: limit temperature of medium to 65 °C.
Drive
–Do not open the drive (pressure in the drive or spring under tension).
–Avoid mechanical stresses on the valve. Do not use the drive 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
returned 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 the handling of hazardous substances
and the transport of dangerous goods.
2.2 Intended use
The angle seat valve VZXA-...-K is intended to shut-off gaseous or liquid media in
piping systems.
–To control liquid media, use only the product variant VZXA-B-... Use (media flow
under valve seat).
2.3 Training of qualified personnel
Work on the product may only be carried out by qualified personnel who can eval-
uate the work and detect dangers. Personnel must have the relevant mechanical
training. The qualified personnel have knowledge and experience in pneumatics.
3 Additional information
–Contact the regional Festo contact if you have technical problems
è www.festo.com.
–Accessories and spare parts è www.festo.com/catalogue.
4 Product overview
4.1 Structure
4.1.1 Product design
1
2
5
4
6
3
4
7
8
Fig.1
1
Drive housing
2
Drive/valve interface with
spanner flat
3
Angle seat fitting
4
Pipe connection; feed or for-
warding (depending on flow
direction)
5
Position indicator
6
Pneumatic ports (2 + 4)
7
Leakage hole
8
Arrow for flow direction
Position indicator
The pneumatic position indicator shows the position of the actuator stem.
Indicator cylinder above Indicator cylinder below
Actuator stem retracted, valve opened Actuator stem extended, valve closed
Tab. 1: Position indicator
4.2 Function
The angle seat valve VZXA-...-K is an externally controlled 2/2-directional control
valve with piston drive. The valve seat is slanted approx. 40° toward the media
flow. To close the valve, the valve actuator using the piston 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 actuated) that must also be integrated into the supply cable for the
drive.
The actuator can be rotated 360° around the valve body.
Flow over valve seat
–The valve is closed by spring force with the medium flow.
–Media pressure assists the closing of the valve.
–The valve is opened by 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 by operating pressure against the media
flow.
–Media pressure assists the opening of the valve.
–In some designs media pressure that is too high or operating pressure that is
too low can result in the valve not closing completely.
Control function
Single-acting Double-acting
Closed by spring force or by
reduced spring force (normally
closed - NC)
Opened by spring force (nor-
mally open- NO)
Opening and closing by two-
way pressurising with oper-
ating medium (compressed air)
Tab. 2: Control function
5 Transport and storage
• For delivery of used products: Comply with all legal requirements for the
handling of hazardous substances and the transport of dangerous goods. For
returns to Festo è Safety.
• Store the product in a cool, dry, UV-protected and corrosion-protected envi-
ronment. Ensure that storage times are kept to a minimum.
6 Assembly and installation
Requirements
–The piping is unpressurised and there is no medium flowing through it.
–The pipe ends are mounted.
–Connecting cables and fittings are clean.

3.
6.1 Cleaning the 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.
• Clean the valve immediately before mounting.
6.2 Mounting the valve
1. Bring the valve into its mounting position.
–Note the flow direction. The permissible flow direction is marked on the
angle seat fitting by an arrow è Fig. 1, [8].
2. Clamp or weld piping to the angle seat fitting, depending on the connection
type.
3. Connect the operating medium connection line.
–Pneumatic port (2): operating medium
–Pneumatic port (4): exhaust port for single-acting drives or operating
medium for double-acting drives
4. For single-acting drives: mount the silencer in the exhaust port or use a
tubing connection for guided exhaust air.
7 Commissioning
WARNING
Risk of injury from manipulation in the operating area of the angle seat valve.
Limbs can be cut or severed.
• Operate the angle seat valve only if it is fully mounted.
Requirements
–The valve is fully mounted and connected.
7.1 Checking operating conditions
1. Check operating conditions and critical limits è Technical data.
2. Check connection points for tightness.
3. Check compatibility of the devices in the system for maximum pressure (con-
sider pressure peaks). If necessary, adjust the application parameters.
7.2 Commissioning the valve with single-acting drives
1. Supply medium.
2. Slowly apply operating pressure to the valve. The operating pressure required
for reliable switching of the valve depends on the pressure of the medium
è 13.2 Technical data, pneumatic.
3. Test the function and check the direction of the individual pneumatic actua-
tors.
7.3 Commissioning the valve with double-acting drives
1. Slowly apply operating pressure to the valve. The operating pressure required
for reliable switching of the valve depends on the pressure of the medium
è 13.2 Technical data, pneumatic.
2. Supply medium.
3. Test the function and check the direction of the individual pneumatic actua-
tors.
8Operation
WARNING
Risk of injury from touching hot surfaces.
Angle seat fitting and actuator can become hot if the temperature of medium is
high. Severe burns are possible.
•Do not touch the angle seat valve during operation or immediately afterward.
• Comply with operating conditions.
•Comply with maintenance conditions è 9 Maintenance.
After longer idle times:
•Actuate the valve several times and check that it functions correctly.
9 Maintenance
WARNING
Risk of injury from touching hot surfaces.
Angle seat fitting and actuator can become hot if the temperature of medium is
high. Severe burns are possible.
•Allow the angle seat valve to cool off before working on it.
• Check product regularly from the outside for leakage and function.
• Check function of the product regularly.
•Clean product regularly with commercial cleaning agents.
10 Malfunctions
Fault description Cause Remedy
Valve does not close or
closes too slowly.
VZXA-B: medium pressure is too
high or operating pressure too low.
Set required differential pres-
sure or adjust operating pres-
sure è Technical data.
Medium contains too many or too
large contaminants.
Comply with operating condi-
tions.
Fault description Cause Remedy
Valve does not open or
opens too slowly.
VZXA-A: operating pressure is too
low or medium pressure too low.
Adjust operating pressure or
medium pressure.
VZXA-B: operating pressure is too
low.
Adjust operating pressure.
Medium leaks out of
leakage hole.
Seal cartridge is faulty. Replace the angle seat fitting.
Medium cannot be shut off. Seat seal is defective. Replace seat seal è Spare
parts documentation.
Tab. 3
11 Modification
DANGER
Risk of injury from flying objects.
Unsecured parts under pressure can fly around and injure people.
• Before replacing wearing parts, depressurise the valve and piping.
1 2
Fig.2
1
Interface screw SW34
2
Spanner flat SW46 for counter
holding
11.1 Demounting the drive from the angle seat fitting - in the installed state
The drive can be removed from the angle seat fitting without removing the valve
from the piping system.
1. Depressurise the piping and allow valve to cool to room temperature.
2. Secure the drive with suitable equipment to prevent it from falling or slipping.
Extend actuator stem.
–With double-acting valves: pressurise port (4) (0.3 MPa; 3 bar; 43.5 psi).
–With valves with N/O control function: pressurise port (2) (0.3 MPa; 3 bar;
43.5 psi).
–For valves with N/C control function: exhaust drive.
4. Loosen interface screw [1].
5. Remove drive from the angle seat fitting.
6. Shut off operating pressure.
11.2 Demounting the drive from the angle seat fitting - in the demounted
state
1. Extend actuator stem.
–With double-acting valves: pressurise port (4) (0.3 MPa; 3 bar; 43.5 psi).
–With valves with N/O control function: pressurise port (2) (0.3 MPa; 3 bar;
43.5 psi).
–For valves with N/C control function: exhaust drive.
2. Loosen interface screw [1].
3. Remove drive from the angle seat fitting.
4. Shut off operating pressure.
11.3 Mounting drive on the angle seat fitting
1. Extend actuator stem.
–With double-acting valves: pressurise port (4) slowly (0.3 MPa; 3 bar;
43.5 psi).
–For valves with N/O control function: pressurise port (2) slowly (0.3 MPa;
3 bar; 43.5 psi).
–For valves with N/C control function: exhaust drive.
2. Push the spindle of the angle seat fitting completely into the angle seat
fitting.
3. Place drive on angle seat fitting.
4. Tighten interface screw [1].
–Tightening torque: 50 Nm ± 10%
5. Shut off operating pressure.
11.4 Rotating drive
1. Loosen interface screw [1] (maximum ½ revolution).
2. Turn drive to the desired position.
3. Tighten interface screw [1].
–Tightening torque: 50 Nm ± 10%
12 Disassembly
DANGER
Risk of injury due to movement of pressurised parts.
The 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.

2.
WARNING
Risk of injury from touching hot surfaces.
Angle seat fitting and actuator can become hot if the temperature of medium is
high. Severe burns are possible.
•Allow the angle seat valve to cool off before working on it.
1. Depressurise the piping and the connecting cable of the operating medium.
Allow the valve and piping to cool.
Drain 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 the connecting cable of the operating medium from the valve.
4. Disconnect the piping connections and remove the valve.
13 Technical data
13.1 Technical data, general
VZXA-...-C.../W...-...-K-46-...-PM
Design Poppet valve with piston drive
Actuation type pneumatic
Sealing principle soft
Mounting position any
Type of mounting In-line installation
Valve function 2/2
Direction of flow not reversible
Product weight è www.festo.com/catalogue
Medium
Medium VZXA-A-… Compressed air grade of filtration 200 ìm, inert
gases1)
Medium VZXA-B-… Compressed air grade of filtration 200 ìm, inert
gases, water, neutral liquid media, petroleum, petro-
leum-based hydraulic fluid, vapour
Pressure of medium [MPa] 0 … 2.5, as specified on product labelling
[bar] 0 … 25, as specified on product labelling
[psi] 0 … 362.5, as specified on product labelling
Viscosity [mm2/s] £ 600
Operating medium
Operating medium Compressed air in accordance with
ISO 8573-1:2010 [7:4:4]
Operating pressure [MPa] max. 0.7 è 13.2 Technical data, pneumatic
[bar] max. 7 è 13.2 Technical data, pneumatic
[psi] max. 101.5 è 13.2 Technical data, pneumatic
Ambient conditions
Temperature of medium
VZXA-A-… [°C] –10 … +60
VZXA-B-… [°C] –10 … +180
Ambient temperature [°C] 0 … 60
Drive degree of protection IP65, IP67
Outdoor use Weatherproof locations class C1 in accordance with
EN 60654-1
Connection for angle seat fit-
ting
VZXA-…-CS5 Clamp connection in accordance with DIN 32676,
Series A
VZXA-…-CS15 Clamp connection in accordance with DIN 32676,
Series B
VZXA-…-CS1 Clamp connection in accordance with ASME BPE
VZXA-…-WS2 Welded end in accordance with DIN 11850 R2
VZXA-…-WS3 Welded end in accordance with
DIN EN ISO 1127/ISO 4200
VZXA-…-WS1 Welded end in accordance with ASME BPE
Operating medium port G 1/8
Information on materials
Valve housing VZXA-…-V13 Stainless steel casting (1.4409)
Valve housing VZXA-…-V14 Stainless steel casting (ASTM A351-CF3M)
Seat seal VZXA-…-T PTFE
Drive housing PA-reinforced
Piston drive seals FPM
Actuator stem High-alloy stainless steel
Drive cover Stainless steel casting (1.4408)
1) Other media on request
Tab. 4: Technical data, general, VZXA
13.2 Technical data, pneumatic
Nominal pressure, burst pressure and flow rate of angle seat fitting VZXA-...-
CS/WS
Port size ["] ½ ¾ 11¼
Nominal width DN 13 20 25 32
Port size ["] ½ ¾ 11¼
Nominal pressure of angle seat fitting
PN
(to max. temperature of medium)
[MPa] 2.5
[bar] 25
[psi] 362.5
Burst pressure
(to max. temperature of medium)
[MPa] 12.5
[bar] 125
[psi] 1813
Flow rate Kv1)
VZXA-A-CS5/WS2-…-…-46-…-PM [m3/h] 5.8 12.2 18.4 25.7
VZXA-A-CS15/WS3-…-…-46-…-PM [m3/h] 5.5 11.2 17.3 23.1
VZXA-A-CS1/WS1-…-…-46-…-PM [m3/h] 2.1 8.6 12.9 —
VZXA-B-CS5/WS2-…-…-46-…-PM [m3/h] 5.3 12.8 17.4 23.4
VZXA-B-CS15/WS3-…-…-46-…-PM [m3/h] 5.2 12.4 16.4 21.6
VZXA-B-CS1/WS1-…-…-46-…-PM [m3/h] 2.2 8.1 14 —
1) Water, at +20 °C, pressure of medium 1 bar at the valve inlet, free outlet
Tab. 5: Technical data, pneumatic, VZXA-...-CS/WS
Medium pressure and operating pressure VZXA-B-…-K-46-…-S (media flow
under valve seat, N/O)
Nominal width DN 13 20 25
Pressure of medium [MPa] 0 … 1.6 0 … 1.35 0 … 0.83
[bar] 0 … 16 0 … 13.5 0 … 8.3
[psi] 0 … 232 0 … 195.8 0 … 120.4
Min. operating pressure [MPa] 0.34 0.5
[bar] 3.4 5
[psi] 49.3 72.5
Tab. 6: Medium pressure and operating pressure VZXA-B-...-K-46-...-S
Fig. 3: Medium pressure and operating pressure VZXA-B-…-K-46-…-S
p1 Pressure of medium
p2 Operating pressure
DN13
DN20
DN25
Pressure of medium and operating pressure VZXA-B-…-K-46-…-D (media flow
under valve seat, double-acting)
Nominal width DN 13 20 25 32
Pressure of medium [MPa] 0 … 1.6 0 … 0.6
[bar] 0 … 16 0 … 6
[psi] 0 … 232 0 … 87
Min. operating pressure [MPa] 0.28 0.31 0.48 0.5
[bar] 2.8 3.1 4.8 5
[psi] 40.6 45 69.6 72.5
Tab. 7: Pressure of medium and operating pressure VZXA-B-...-K-46-...-D
Fig. 4: Pressure of medium and operating pressure VZXA-B-…-K-46-…-D
p1 Pressure of medium
p2 Operating pressure
DN13
DN20
DN25
DN32

Pressure of medium and operating pressure VZXA-B-…-K-46 (media flow under
valve seat, N/C)
Nominal width
DN
13 20 25 32
Pressure of
medium
[MPa] 0 … 2.5 0 … 1.28 0 … 0.83 0 … 0.44
[bar] 0 … 25 0 … 12.8 0 … 8.3 0 … 4.4
[psi] 0 … 362.5 0 … 185.6 0 … 120.4 0 … 63.8
Min. operating
pressure
[MPa] 0.48
[bar] 4.8
[psi] 69.6
Tab. 8: Pressure of medium and operating pressure VZXA-B-...-K-46
Pressure of medium and operating pressure VZXA-B-…-K-46 …-PR (media flow
under valve seat, N/C with reduced spring force)
Nominal width DN 13 20
Pressure of medium [MPa] 0 … 1.15 0 … 0.6
[bar] 0 … 11.5 0 … 6
[psi] 0 … 166.8 0 … 87
Min. operating pressure [MPa] 0.26
[bar] 2.6
[psi] 37.7
Tab. 9: Pressure of medium and operating pressure VZXA-B-...-K-46-...-PR
Pressure of medium and operating pressure VZXA-A-…-K-46-…-PR (media flow
above valve seat, N/C with reduced spring force)
Nominal width DN 13 20 25 32
Pressure of medium [MPa] 0 … 1.6 0 … 1 0 … 0.68
[bar] 0 … 16 0 … 10 0 … 6.8
[psi] 0 … 232 0 … 145 0 … 98.6
Min. operating pressure [MPa] 0.26 0.41 0.5
[bar] 2.6 4.1 5
[psi] 37.7 59.5 72.5
Tab. 10: Pressure of medium and operating pressure VZXA-A-...-K-46-...-PR
Fig. 5: Pressure of medium and operating pressure VZXA-A-…-K-46-…-PR
p1 Pressure of medium
p2 Operating pressure
DN13
DN20
DN25
DN32