Data Center Valves – Key Selection Criteria & Surface Finishing

When specifying valves for data center applications, it is essential to confirm the following parameters with your customer:

1. Fluid type
2. Ambient temperature
3. Operating pressure
4. Salt spray test requirement

Items 1 and 2 directly influence the selection of sealing materials, while item 3 affects the choice of surface treatment processes.

 

 

Data center cooling system piping

 

Surface Treatment Options

Common surface finishing processes include:

• Solution annealing
• Electropolishing
• Deep passivation
• Sealing
• Polishing
• Dacromet coating

Depending on the product and specific requirements, these processes may be used individually or in combination to achieve optimal performance.

 

When Is a Salt Spray Test Required?

Salt spray testing is a critical measure of corrosion resistance. In data center environments, it should be considered under the following circumstances:

• Coastal or high-salinity environments – If the data center (especially its fresh-air intake or evaporative cooling systems) is located near the sea, airborne salt particles can cause accelerated corrosion. Salt spray testing verifies that the valve can withstand such conditions.
• Customer or industry standards – Many large cloud providers and financial-sector data centers mandate specific salt spray test durations (e.g., 500 hours or even 1000 hours of neutral salt spray without red rust). Meeting these requirements demonstrates long-term reliability.

 

Selecting the Right Surface Treatment for Each Condition

Here's a quick reference guide to help you choose the most suitable finish:

 

Process	Purpose	Recommended Applications (Data Center Valves)
Solution Annealing	Improves internal microstructure, enhancing corrosion resistance and toughness	A fundamental heat treatment for austenitic stainless steels (e.g., 304, 316L) – a preparatory step rather than a final coating.
Electropolishing (EP)	Reduces surface roughness, produces a smooth, bright finish	Ideal for ultra-clean systems (e.g., chip-making cooling loops or immersion liquid cooling) where low particle adhesion and bacterial growth are critical.
Deep Passivation	Removes surface contaminants and forms a robust chromium-oxide passive layer	Essential for all stainless steel valves to boost baseline corrosion resistance – particularly recommended for deionized water or specialty coolants.
Sealing	Closes micro-pores on metal surfaces, improving anti-corrosion and anti-fouling properties	More common for anodized or plated parts; less frequently used on stainless steel valves.
Polishing	Enhances surface flatness and gloss	Can be used as a pre-step to electropolishing, or as a standalone finish where aesthetics are desired but ultra-smoothness is not mandatory.
Dacromet Coating	Provides outstanding salt-spray corrosion resistance	The top choice for carbon steel or cast iron valves requiring heavy-duty protection. Withstands >1000 hours of salt spray – ideal for coastal data centers or pipe supports.

 

 

Stainless steel industrial valve piping system

 

Practical Selection Guidelines for Data Center Valves

Based on typical data center operating conditions, here are our recommendations:

Standard indoor environments (chilled water systems)

• Valve body: Ductile iron or carbon steel.
• Surface finish: Epoxy coating (cost-effective, adequate protection).
• Salt spray test: Not mandatory unless specified.

Coastal regions or high-salt atmospheres

• Valve body: Stainless steel (304/316L recommended).
• Surface finish: Solution annealing + deep passivation, plus electropolishing on wetted surfaces.
• Salt spray test: Strongly advised, with a minimum requirement of 500 hours.

High-cleanliness applications (e.g., liquid cooling)

• Critical: Valve material must be fully compatible with the cooling fluid.
• Surface finish: Electropolishing (EP) on fluid-contact surfaces to minimise contamination and corrosion risk.

Heavy-duty corrosion protection for non-stainless valves

• If carbon steel is chosen for cost or strength reasons, and corrosion is a concern, opt for Dacromet coating for superior protection.

 

 

Electropolished stainless steel surface close up

 

In Summary

• Salt spray testing is the "examination" that validates corrosion resistance.
• Surface treatment is the "tool" that delivers that resistance.

In high-standard or coastal projects, both are typically specified together. By understanding your operating environment and customer requirements, we can tailor the optimal valve solution – ensuring reliability, longevity, and peace of mind.

 

Interested in learning more?

Contact us today  for expert guidance and customised valve recommendations for your data centre projects.