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TMV Servicing: Our Approach and Frequently Asked Questions

Welcome to our comprehensive guide on TMV servicing! A Thermostatic Mixing Valves (TMVs) core function is to ensure safe and consistent water temperatures are being delivered throughout your facility. However, like any mechanical component, TMVs require regular maintenance and care to function optimally. In this blog post, we'll dive into the most common questions surrounding TMV servicing and touch upon how Titan can support UK customers in this area. Whether you're a seasoned plumbing professional or a Facilities Manager, we've got you covered with answers to all your TMV servicing queries.

Thermostatic Mixing Valves

What Is TMV Servicing?

Thermostatic mixing valve servicing refers to the maintenance and inspection of these valves to ensure they are functioning correctly.

Why Do TMV's Need Serviced?

Thermostatic Mixing Valves (TMV's) need servicing for a variety of reasons:

  • Safety

  • Compliance

  • Preventing Failures

  • Maintaining Performance

  • Preventing Contamination

  • Energy Efficiency

  • Reducing The Risk Of Legionella

  • Prolonging Lifespan

Is TMV Servicing A Legal Requirement?

Yes, in the United Kingdom, TMV (Thermostatic Mixing Valve) servicing is often a legal requirement in certain settings to ensure the safety of users. Specifically, TMV servicing is mandated in the UK in the likes of Healthcare, Education and Childcare settings.

How Often Should A TMV Be Serviced?

TMV's should be serviced every 12 month as a minimum. However, the frequency of your thermostatic mixing valve servicing can vary based on these factors:

  • Manufacturers Recommendations

  • Usage

  • Local Regulations

  • Risk Assessment Guidance

How Long Does It Take To Service A TMV?

The time it takes to service a thermostatic mixing valve (TMV) can vary depending on several factors, including the complexity of the valve and its current condition. In general, a TMV servicing procedure typically takes anywhere from 30 minutes to a few hours.

How Do We Service A TMV?

Titan operate through 5 nationwide project hubs, supporting some of the nations leading Facilities Management and blue-chip companies in TMV servicing. This process can vary from site-to-site, however below is our general methodology!

  1. Review plantroom performance records (if available) between service visits and note any variations in temperatures.

  2. Gain access to TMV, ensuring that any surrounding panels, mirrors, handrails, or any furnishings can be fully reinstated.

  3. With plantroom still in service, shut each isolation valve in turn and check for correct operation.

  4. Record the blended water temperature followed by the hot and cold-water temperatures separately.

  5. Perform a cold fail safe shut off test by isolating the cold-water supply to the TMV. Then, wait 2 seconds and if the water supply stops the failsafe shut off is functioning and the valve is working correctly.

  6. Isolate both the hot and cold feeds and then proceed to open the tap to confirm that the isolation valves are operational.

  7. Valves are to be removed, all accessible fittings to the TMVS are removed if practical, the strainers are to be removed if practical and all components disinfected with an appropriate disinfection and descaling agent. The valve should be visually checked for any issues, then reinstated to the original position. If the valve is not operating correctly once serviced then the client will be informed immediately and the findings logged on the engineer’s report sheet will detail the make, model number and location of the TMV. Remedial action will be subject to client approval.

Whether it's a new TMV replacement or you're in need of a series of TMV servicing, Titan have the expertise to get the job done right! Click the above links to start your journey into safer water system management through Titan.



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