General guidelines once valve failure has occurred and been identified are as follows:
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Identify location of valve failure (seat, body, actuator, etc.).
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Take necessary troubleshooting steps to further identify root cause or to resolve while the valve is in place.
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Ensure appropriate spare parts are on hand before removing valve from service.
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Remove valve from piping (if necessary) following appropriate procedures, including air and electrical disconnection and lockout tagout.
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Follow proper disassembly and maintenance procedures to resolve issue and reassemble valve.
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Re-install valve into piping with correct air and electrical connections.
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Actuate and test valve to ensure proper function before production startup.
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Monitor valve during initial production run to ensure valve is operating correctly.
Author - Chris Sinutko