Maintenance of Pilot Operated Safety Valves

Guidance for the repair or maintenance of LESER Pilot-operated safety valves type 811 and 821. This MAINTENANCE TOOLBOX provides  comprehensive information, guidance, and instructions you need to meet LESER’s quality standards.

The documents are only available in English.

Maintenance Toolbox

Maintenance videos

In addition, LESER offers you a series of maintenance videos in which you can follow the maintenance of pilot operated safety valves step by step.

1. Disassembly of Wires and Tubing

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2.1 Disassembly Modulate Action Pilot 

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2.2 Disassembly Pop Action Pilot

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3. Disassembly Main Valve

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4.1 Assembly Modulate Action Pilot Diaphragm

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4.2 POSV Assembly Pop Action Pilot

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5. Assembly Main Valve

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6. Adjustments and Tests of Set Pressure

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7. Adjustments and Tests of Tightness

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