3/2-Ways Lacquer Valve 2004
1. Introduction
The APSON 3/2-Ways Lacquer Valve 2004 is a pneumatically
controllable compact needle valve made of
inoxidable steel. It fulfills its function together with modules
intended therefore, e.g. valve blocks, lacquer distributors,
sprayheads, a.o. Valves of this type are designed
for aggressive non-granular fluid media,
e.g. lacquers, solvents, caustic solutions, a.o.
They serve for switching the medium stream into two
from each other separated media circuits.
2. Structure and Function
The valves consist of the drive in the pneumatics chamber, a
seal packing in the intermediate chamber and the two medium seals
in the medium chamber (actual valve). The valves have a mechanical
visual display of the switching status.
The drive consists of the pneumatic
cylinder, a piston with sealing diaphragm, the valve needle and
the pre-compressed spring for closing the valve, if the valve
is not addressed with compressed air.
The piston and the valve needle are rigidly
connected together.
The seal packing (medium barrier) consists
of several seals, which manage the sealing at the valve needle by
means of a pre-compressed spring, on the one hand to the
medium chamber and on the other hand to the
pneumatics chamber.
The medium seals consist of the valve
needle head and two seals, which withstand aggressive media.
All seals of the valve must therefore be adapted to the media
which are to be used.
The mechanical visual display consists of
a display pin for the switching status of the valve. The display
pin is rigidly connected with the valve needle. The valve can be
switched by pulling on the display pin manually.
Optionally the possibility exists for sensing electrically
the status of the valve by means of a proximity sensor.
In the screwed in status with the appropriate valve block,
the valve forms one discrete medium chamber, with one inlet
and two outlets each with axial sealing seats
for the medium.
The outlet wich in normal condition (without control signal)
is closed is called normally closed outlet.
The other outlet is called thus normally open
outlet.
In the inactive status (normal condition),
no compressed air or control signal pends, and the normally closed
outlet is closed and the normally open outlet is open.
In the active status, the valve is
controlled with compressed air, and the piston formed by the
diaphragm connected with the valve needle squeezes a spring
together. Thereby the status of the outputs is toggled and the
normally closed output is opened and the normally opened output
is closed.
3. Features
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Fast error recognition in the lacquer system by directly evident switching status.
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Early detecting of leakage of the medium as well as the pneumatics air.
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Manual toggling of the valve with a special tool possible.
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Fast valve exchange, and efficient maintenance and spareparts management.
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Small pressure loss between medium inlet and medium outlets.
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Very good rinsing characteristics, because of APSON deathroom-free valve technology.
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Very compact design.
4. Technical Data
| Denomination: | APSON 3/2-Ways Lacquer Valve 2004 |
| Media: | Aggressive media (lacquers, solvents, caustic solutions, a.o. |
| Medium pressure: | approx. 12 bar (or in accordance with customer's request) |
| Pneumatics air pressure: | 6 to 8 bar |
| Medium-touching housing parts: | Inoxidable steel |
| Piston seal: | Teflon™ |
| Main seals: | Teflon™ (optional Kalrez™) |
| Housing seals: | Viton™ |
5. Service Life
For the APSON 3/2-Ways Lacquer Valve 2004
the following service lives were determined within the
basecoat area.
The service life for valves, at operation with basecoat lacquer
amounts to approx. 500,000 switching cycles.
For a troublefree operation of this lacquer valve type,
all 300,000 switching cycles a visual inspection must be executed.
The visual inspection is to be executed first at the installed
valve and afterwards in the unscrewed status.
The installed valve must be outward absolutely tight:
-
If pneumatic air withdraws from the bleed bore (annular gap cover), the pneumatic seal at the piston must be exchanged.
-
If pneumatic air withdraws from the exhausting drilling of the valve needle, the piston sided seal (air side) of the valve needle for the pneumatic control air must be exchanged.
-
If lacquer withdraws from the exhausting drilling of the valve needle, the seal at the valve needle (lacquer side) must be exchanged.
At the unscrewed valve the following critical parts are to
be checked for wear:
-
Main seals of the needle
-
O-rings of the valve
-
Needle seals to compressed air side or lacquer side
Important: After
approx. 300,000 switching cycles the compression spring in the
pneumatics chamber must be exchanged by a new greased compression
spring.
The exchange can be managed without unscrewing the valve from its
valveblock within one minute.
For safety reasons the medium should be switched pressure-free
during the exchange of the spring.
Eventually the inner surface of the pneumatic cylinder is to
be coated again with valve fat.
6. Ordering Data
| Denomination | Part-Nr. |
| APSON 3/2-Ways Lacquer Valve 2004 | 060-A015 |
Options:
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Main seal from Kalrez™
-
Non medium-touching housing parts from aluminum
APSON Lackiertechnik GmbH, Am Wiesengrund 15, D-63075 Offenbach
Mobile: +49-171-373-16-33 Phone: +49-69-82-369-447 Fax: +49-69-82-369-448
www.apson.de email@apson.de
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productnames of their respective owners.