Controlling process gas flow
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United States of America Patent
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Oct 19, 1993
Grant Date -
N/A
app pub date -
Apr 23, 1992
filing date -
Apr 23, 1992
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A method and apparatus for controlling the pressure to the bonnet of a pressure regulator, wherein two solenoid valves in combination with a buffer tank and a microprocessor to control the solenoid valves. When the pressure within the regulator bonnet exceeds a specified maximum value, one of the solenoid valves opens to allow the control pressure going to the regulator bonnet to be decreased. When the pressure in the regulator bonnet falls below a preset minimum value, the other solenoid valve opens to allow increased control pressure to enter the regulator and raise the regulator bonnet pressure to the level required.
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