Extending Valve Life: A Guide to Industrial Valve Maintenance Kits

Given that industrial valves are the heart of a piping system, it’s essential for facility managers to remember that these soft components can also wear over time. Here lies the essence of maintenance kits. They must be of high quality to ensure a longer lifespan for the valve and the system as a whole, and to reduce the risk of valve repair. 

Using Valve Maintenance Kits Effectively

Maintenance kits can only be excellent if they restore valves to their original factory-leakage standards without a full replacement. The easy access to such a kit ensures the MRO procurement team can streamline inventory and guarantee that technicians have the exact parts they need.

What’s Inside a Standard Maintenance Kit?

A standard kit contains components that provide a primary pressure boundary and sealing force. Working with lined valve systems requires parts to be made of high-density polymers, such as PTFE or PFA, to maintain chemical resistance. 

• Seats are the main sealing surface that contacts the disc. 
• Packing comes with a series of rings wrapped around the stem to prevent fugitive emissions. 
• Gaskets and O-rings are secondary seals that provide a snug fit between the body and the liner and cap. 
• A thrust washer is a low-friction material that prevents contact of metals during actuation. 

When to Order Spare Parts

Industrial spare parts must be procured in advance. It’s not ideal for procurement teams wait for the leak to happen before securing the parts. Doing so affects the plant’s uptime and may cause unforeseen production losses. Most importantly, emergency shipments are generally expensive. 

Predictive Maintenance vs. Run-to-Failure

Cycle counts are primarily used for predictive maintenance to trigger a valve repair before a failure. The soft parts of critical process valves used in industrial facilities must be replaced every 12 to 24 months. 

Shelf Life of Soft Goods (PTFE/Rubber)

PTFEs have an unlimited lifespan, while O-rings usually last 5 to 10 years, depending on storage conditions and practices. Storing maintenance kits in a cool, dry place is crucial to prevent seals from becoming brittle.

Step-by-Step Soft Parts Replacement

Being meticulous and precise in internal valve replacements is crucial. Even a minute scratch on the sealing surface may result in leakage. 

Disassembly Safety

Engineers must depressurize, drain, and flush the line before loosening the first bolt. This is crucial in preventing burns. The valve is then removed from the link and transferred to a clean bench. 

Cleaning Seal Surfaces

After removing the old spare parts, it’s vital to thoroughly clean the lined housing. Maintenance personnel must remove the residues from the previous media using non-abrasive tools. Experts recommend using a wooden or plastic scraper to prevent indentations of the PFA lining. 

Cost-Benefit of Repair vs. Replace

Repairing the valve is a much more cost-effective option than a full replacement. In fact, it offers a significant ROI. A maintenance kit costs about 10 -20% of the valve price. Meanwhile, full replacements involve higher shipping costs, possible piping modifications, and longer lead times. Overall, investing in an efficient MRO procurement allows facilities to prolong the life of valve assets at least twice their original lifespan.