In-line differential pressure controller

A system for developing a pressure differential in pressurized wellhead separator having a well inlet separator, a gas flow line, a gas meter and a liquid level control with a dump line downstream of the gas meter, the system comprising:

• a flanged connection in the gas flow line -downstream of the well inlet separator and upstream of the dump line;
• and
• a differential pressure controller inserted into the gas flow line at the flanged connection, the controller comprising:
• a plate adapted for insertion into the line and supported at the flanged connection,
• at least one flow port formed through said plate;
• and
• at least one pressure control valve mounted on the plate, said valve residing wholly within the gas flow line and adapted to control flow through the flow port;
• wherein said plate is of such dimensions so as to direct substantially all of the line's gas flow through the flow port and pressure control valve, thereby creating a pressure differential in the gas flow line.

A system for developing a pressure differential in a gas flow line comprising:

• at least one flanged connection in the gas flow line;
• and
• a differential pressure controller inserted into the gas flow line at the flanged connection, the controller comprising:
• a plate adapted for insertion into the line and supported at the flanged connection,
• at least one flow port formed through said plate;
• and
• at least one pressure control valve mounted on the plate, said valve residing wholly within the gas flow line and adapted to control flow through the flow port;
• wherein said plate is of such dimensions so as to direct substantially all of the line's gas flow through the flow port and pressure control valve, thereby creating a pressure differential in the gas flow line.