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actuators and accessories
www.vici.com
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Valco Instruments Co. Inc. Sales:
800–367–8424
Fax: 713–688–8106
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195
tech tip
Here's what you'll get
when you order:
Two Position Air Actuators
more information
HSSA . . . . . page 198
High speed
switching accessory
PFAF . . . . . . . . . 199
Position feedback
Air actuator
for use with
an existing standoff
Air actuator with a
4" standoff assembly
Air actuator with a
closemount assembly
The recommended method for
implementing a two position air
actuator is a manifold solenoid valve
assembly (MSVA), a block-mounted
pair of 3-way solenoids that pulses
air to the actuator to switch it from
position to position. If air is applied
continuously, the continuous
rotational force applied to the valve
can cause sideloading, leaking, and
additional wear.
Typical actuation pressure is 40 to 50
psig, but up to 80 psig may be used.
Ideally, only enough air pressure
should be used to switch the valve in
1/3 to 1/2 second. Bottled instrument
air or nitrogen is recommended. If
plant air from compressors must be
used, an oil separator and water dryer
are required.
A high speed switching accessory
(HSSA) can upgrade valve switching
times to less than 30 ms with air or 8
ms with helium. A position feedback
(PFAF) with contact closures in both
positions is also available as an option.
Standard air actuators
for two position valves
Temperature range 0-70°C
Standoff version includes a 4" standoff. 2", 3", and 6" standoffs are also available.
With closemount
With 4" standoff
For use with
No. of ports
assembly
assembly
existing standoff
in valve
Description
Prod No
Prod No
Prod No
3, 4
90° rotation
A90
A904
A90S
6
60° rotation
A60
A604
A60S
8
45° rotation
A45
A454
A45S
10
36° rotation
A36
A364
A36S
12
30° rotation
A30
A304
A30S
High temperature air actuators
for two position valves
Temperature range 50-175°C
Standoff version includes a 2" standoff. 3", 4", and 6" standoffs are also available.
With closemount
With 2" standoff
For use with
No. of ports
assembly
assembly
existing standoff
in valve
Description
Prod No
Prod No
Prod No
3, 4
90° rotation
AT90
AT902
AT90S
6
60° rotation
AT60
AT602
AT60S
8
45° rotation
AT45
AT452
AT45S
10
36° rotation
AT36
AT362
AT36S
12
30° rotation
AT30
AT302
AT30S
Replacement O-rings
Includes a complete set of O-rings for a two position air actuator.
Description
Prod No
Standard
OR
High temp
ORT
Actuator compression fittings
Includes 1/8" compression to 10-32 male thread, plus 1/8" brass ferrule and hex nut.
Description
Prod No
3 piece
F-TCF
fitting assembly
CHROMalytic TECHnology Pty Ltd AUSTRALIAN Distributors e-mail: sales@chromtech.net.au Tel: 03 9762 2034