Solenoid valves - Bürkert Fluid Control Systems
Solenoid valves - Bürkert Fluid Control Systems
Solenoid valves - Bürkert Fluid Control Systems
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2.2.3. Direct-acting solenoid <strong>valves</strong>:<br />
pivoted-armature <strong>valves</strong><br />
Pivoted-armature <strong>valves</strong> are used with<br />
a 3/2-way function and in a 2/2-way<br />
version. On the 3/2-way Bürkert pivoted-armature<br />
valve (e.g. Type 0330,<br />
see Figure 3), all three ports are accommodated<br />
in the valve body and an<br />
isolating diaphragm prevents fluid from<br />
entering the solenoid system’s armature<br />
chamber. The pivoted-armature<br />
<strong>valves</strong> are equipped with a manual<br />
override function (standard) and can<br />
also be optionally equipped with a visual<br />
position indicator or an electrical<br />
feedback indicator.<br />
Advantages:<br />
■ Excellent reliability<br />
■ All three fluid ports in one plane<br />
■ Media separation on standard<br />
design<br />
■ Long service life<br />
■ AC, DC and UC versions available<br />
■ Visual or electrical position feedback<br />
optionally available<br />
■ Also available as explosion-proof<br />
version<br />
■ Conditionally suitable for aggressive<br />
media as well<br />
Potential disadvantages:<br />
■ Replacement part exchange<br />
difficult<br />
■ Cost-intensive<br />
2.2.4. Direct-acting solenoid <strong>valves</strong>:<br />
3/2-way rocker valve<br />
The Bürkert rocker solenoid valve<br />
(Bürkert Types 6104 and 6106) is designed<br />
for operation with compressed<br />
air; all three ports are also accommodated<br />
in the valve body. The valve is<br />
also frequently used as a pilot valve<br />
for pneumatic <strong>valves</strong>. A rocker with<br />
sealing seats alternately closes valve<br />
seats 1 for the air supply (fluid port P)<br />
and 2 for venting (fluid port R) of the<br />
outlet channel (fluid port A) (see Figure<br />
4), in a similar manner to the pivoted-armature<br />
valve. <strong>Solenoid</strong> <strong>valves</strong><br />
with rocker technology are available<br />
with or without isolating diaphragm.<br />
Return<br />
spring<br />
Valve seat 1<br />
P<br />
A<br />
Electrical connection<br />
Manual override<br />
<strong>Solenoid</strong> coil<br />
Core,<br />
pivoted armature<br />
Isolating diaphragm<br />
Valve seat 2<br />
R<br />
Valve body<br />
Advantages:<br />
■ Low mass of moving parts<br />
■ 3 fluid ports in one plane<br />
■ Media-separated version available<br />
■ Economical<br />
■ Very long service life<br />
■ Compact design<br />
■ Low coil power<br />
■ High coil system efficiency<br />
■ Also available as explosion-proof<br />
version (intrinsically safe).<br />
Figure 3:<br />
Bürkert pivoted-armature solenoid valve<br />
20/21
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