Festo VZXA Technical Data
Angle seat valves VZXA
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Angle seat valves VZXA
Key features
Function
The angle seat valves VZXA are extern
ally actuated valves which are con
trolled by a direct feed of compressed
air and are used to shut off gaseous
NC version (normally closed) NO version (normally open)
DA version (double acting)
or liquid media in pipe systems. In
the process, a spindle with a softsealing valve disc is raised and
lowered with the aid of a pneumatic
In the normal position, the valve is
closed by a spring. When the actu
ator is supplied with operating pres
sure, it raises the control piston and,
at the same time, the valve disc too –
this opens the valve.
The control function is performed by
reciprocal pneumatic actuation of
the actuator chambers.
actuator. In all the versions men
tioned below, the valve seat is slanted
around 40° toward the medium flow.
The direction of flow is determined by
the design of the valve (process valve
and actuator).
In the normal position, the valve is
opened by a spring. When the actu
ator is supplied with operating pres
sure, it lowers the control piston and,
at the same time, the valve disc too –
this closes the valve.
Economical Flexible Design
Modular design
Hygienic design, insensitive to dirt
Long service life
Quick and easy maintenance
High flow rates achievable
Product configurator
Control of medium flows (gaseous
and liquid) in closed and open
circuits
The angle seat valves VZXA are
simple and sturdy and are thus per
fectly suitable for almost all media
with a viscosity of up to 600 mm²/s
Angle seat valves VZXA made from
stainless steel with PTFE seals have
high chemical and thermal
resistance
Temperature of medium
–10 … +180 °C
Configurable product
This product and all its options can be
ordered using the configurator.
G thread to DIN ISO 228-1
Parallel Whitworth pipe thread,
non-metallically sealing: must
either be provided with an annular
seal outside the thread or must be
sealed by wrapping the thread with
PTFE or hemp
NPT thread to ANSI/ASME B 1.20.1
American tapered pipe thread with
sealing material sealing in the
thread, female thread tapered,
male thread tapered
Rc thread to DIN 10226-2
Pipe thread for fittings sealing in
the thread, female thread tapered,
male thread tapered
The configurator can be found under
Products on the DVD or at
è catalogue/…
Connection sizes
1/2" … 2" and DN13 … DN50
Medium pressure: 0 … 30 bar
Operating pressure: 5 … 10 bar
Threaded collar connection
Actuator sizes: piston actuator
46 mm and 75 mm
ATEX
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VZXA 3539410
2
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Subject to change – 2017/06
Angle seat valves VZXA
Product range overview
Product range overview
Type Control function Direction of flow
VZXA-A-… Closed via spring force, NC Above valve seat
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For gaseous media, “closing in the direction of medium flow” is
used
VZXA-B-… Closed via spring force, NC
Opened via spring force, NO
Double-acting, DA
Below valve seat
For gaseous and liquid media, “closing against the direction of
medium flow” is used in order to prevent or reduce water hammer
effects
2017/06 – Subject to change
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3
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Angle seat valves VZXA
Type codes
Type
VZXA Process valve
Direction of flow
A Above valve seat for gaseous media
B Below valve seat for gaseous and liquid media
Control of the medium
– On/off operation
Line connection
T Threaded collar
Connection standard
S6 DIN ISO 228-1
S7 ANSI/ASME B 1.20.1
S13 DIN 10226
VZXA – A – – T S7 – 1/2" – M2 – V14 T
Connection size
1/2" 1/2"
3/4" 3/4"
1" 1"
11/2" 11/2"
11/4" 11/4"
2" 2"
13 DN13
20 DN20
25 DN25
32 DN32
40 DN40
50 DN50
Temperature of medium
M2 –10 to +180 °C
Valve housing material
V13 Stainless steel 1.4409
V14 Stainless steel ASTM A351-CF3M
Seat seal material
T PTFE
4
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Subject to change – 2017/06
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