Server Strainer Isolation Block

Servo strainer plugging is the most common problem encountered on GE steam turbine high pressure fluid systems. Barry Sibul & Company has the solution:

The Servo Strainer Isolation Block

Up stream of the first stage nozzle of the Abex servo valve used on GE steam turbine EHC systems is a replaceable 90 mesh strainer that plugs with dirt causing the servo valve to fail in the closed position.

This 90 mesh servo strainer is removed from the servo valve and remounted on the Servo Strainer Isolation Block which is inserted between the servo valve and the hydraulic actuator.

The Servo Strainer Isolation Block contains two 90 mesh servo strainers - one primary and one backup - connected to a selector valve. If a strainer becomes plugged causing the servo valve to close, just switch to the backup servo strainer and continue normal operation. Then, while the unit continues to run normally, the plugged strainer can be changed.

On turbines that have servo valve isolation capabilities, the Servo Strainer Isolation Block can be installed on-line. On other units, the modification can be completed in less than 15 minutes per valve.

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