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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.
POSV Disassembly Wires and Tubing LESER

1. Disassembly of Wires and Tubing

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Disassembly Modulate Action Pilot diaphragm

2.1 Disassembly Modulate Action Pilot 
       Diaphragm

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Disassembly Pop Action Pilot

2.2 Disassembly Pop Action Pilot

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POSV Disassembly Main Valve

3. Disassembly Main Valve

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POSV Assembly Modulate Action Pilot diaphragm

4.1 Assembly Modulate Action Pilot Diaphragm

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Assembly Pop Action Pilot

4.2 POSV Assembly Pop Action Pilot

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POSV Assembly Main Valve

5. Assembly Main Valve

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POSV Adjustments and Tests set pressure

6. Adjustments and Tests of Set Pressure

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3 POSV Adjustments and Tests Tightness

7. Adjustments and Tests of Tightness

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Contact finder

Your local contact person will support you with all questions concerning the safety valve.

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