Masoneilan SVI II AP Installation and Maintenance ... - GE Energy
Masoneilan SVI II AP Installation and Maintenance ... - GE Energy
Masoneilan SVI II AP Installation and Maintenance ... - GE Energy
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Pneumatic Module<br />
Operation <strong>and</strong> <strong>Maintenance</strong><br />
Pneumatic Module<br />
The pneumatic module consists of an I/P <strong>and</strong> Relay assembly.<br />
Current-to-Pressure Converter, I/P<br />
The I/P converts a current signal to a pressure signal in the following manner. A fixed<br />
coil creates a magnetic field proportional to the applied current. The field magnetically<br />
pulls a flexure towards a nozzle to increase pressure on the flexure. The pressure on<br />
the flexure increases in response to an increase in the coil current. Encapsulation of the<br />
coil provides protection from the environment.<br />
Single Acting Pneumatic Relay<br />
<strong>SVI</strong> <strong>II</strong> <strong>AP</strong><br />
The single acting pneumatic relay amplifies the pressure from the I/P <strong>and</strong> increases<br />
airflow as required for stable, responsive, actuator performance. The single acting relay<br />
operates on any supply pressure that is at least 5 psi (.345 bar, 34.5 kPa) above the<br />
required actuator pressure, up to 100 psi (6.9 bar, 690 kPa).<br />
I/P Current to Pneumatic Converter<br />
Relay<br />
(Pneumatic Amplifier)<br />
Vent<br />
Figure 74<br />
<strong>SVI</strong> <strong>II</strong> <strong>AP</strong> Pneumatic Module with Single Acting Relay<br />
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