How to Use a Ball Valve Lockout

 

1. Pre-Installation and Disassembly Requirements

Before performing any installation, removal, or maintenance procedures, ensure that the upstream and downstream pipelines of the ball valve are fully depressurized. Proceed only after confirming a zero-pressure condition.

2. Cleaning of Non-Metal Components

After cleaning non-metal parts, remove them from the cleaning solution immediately. Extended soaking is not permitted to avoid material degradation or deformation.

3. Flange Bolt Installation

When assembling flange bolts, they must be tightened in a symmetrical, incremental, and uniform manner to ensure proper sealing and to prevent mechanical stress.

4. Cleaning Agent Compatibility

Verify that the cleaning agent is compatible with all rubber, plastic, and metal components within the ball valve, as well as with the working medium (e.g., gas).

  • For metal parts used in gas service, gasoline (GB484-89) may be used.
  • For non-metal components, clean only with pure water or alcohol.

5. Cleaning Method for Components

Each disassembled component may be cleaned by immersion.
For components that cannot be disassembled—especially non-metal parts—wipe with a clean, lint-free cloth saturated with an appropriate cleaning agent.
Ensure that all grease, dirt, adhesive residues, dust, and other contaminants are completely removed from the surfaces.

6. Protection of Sealing Surfaces

During disassembly and reassembly, take precautions to avoid damage to all sealing surfaces, particularly non-metal sealing elements.
Use dedicated tools when removing O-rings to prevent scratching or deformation.

7. Post-Cleaning Handling

After cleaning, components must be reassembled only after the cleaning agent has fully evaporated. A dry, lint-free cloth may be used to assist drying.
Do not leave cleaned components exposed for an extended period, as this may result in rust formation or contamination.

8. Preparation of New Components

All new replacement parts must be cleaned according to the same procedures prior to installation to ensure cleanliness and functional reliability.

9. Lubrication Requirements

Apply an appropriate lubricant to key surfaces. The lubricant must be compatible with the valve’s metallic materials, rubber elements, plastic components, and the working medium.

  • For gas applications, specialized 221 grease is recommended.
    Apply a thin, uniform layer to:
  • the sealing groove surfaces,
  • the rubber sealing rings,
  • the stem sealing surfaces and friction areas.

10. Contamination Control During Assembly

During reassembly, ensure that no metal shavings, fibers, unauthorized grease, dust, or other foreign substances contaminate the component surfaces or enter the internal cavity of the ball valve.

ball valve lcok

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