Top 10 questions you should ask when purchasing a ...

Top 10 Questions You Should Ask When Purchasing a Control Valve

Automatic control valves, like many other purchases, are not all created equal. Some valves fall into the high-quality bracket with corresponding pricing, while others are closer to the low-quality, price-sensitive end of the spectrum. Unfortunately, when evaluating control valve prices, it is not always clear what you are being offered and what standards the valve meets. Here are several important questions to consider and ask the supplier to ensure you achieve years of trouble-free operation that outlasts the time it takes for the salesperson to exit your parking lot!

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Q1: What Materials Are Used?

It is essential to know the materials of the different components of the valve, as this will greatly affect its lifespan:

• Body Material: Is the valve body made of cast iron or ductile iron? Traditionally, valves were made of cast iron, but ductile iron has become the new standard due to its superior physical properties, which are much better at resisting environmental effects.
• Body Coating: Many regions insist on a fusion-bonded coating for valves, both inside and out. Unfortunately, this is not always requested in North America. A coated valve is a wise choice for valves that are constantly wet or located in less than pristine environments.
• Seat Material: Bronze is commonly used for seats, but it can wear over time depending on water quality and flow rates, requiring replacement. Ideally, opt for stainless steel to avoid future issues.
• Valve Internals: Most manufacturers use stainless steel for valve stems. Make sure to ask about the specific grade since not all stainless steel is equal. 316 stainless steel is the best choice due to its hardness and corrosion resistance.
• External Fasteners: Valves often experience moisture exposure, leading to rusted bolts. Request stainless steel fasteners to ensure that they will be removable, regardless of the valve's age.

Q2: Does the Valve Supplier Fully Understand Your Application?

Often, specifications are provided, and a valve is supplied that is unsuitable for the job. Make sure to provide your supplier with all necessary pressure and flow details, as well as specifics about the application. The wrong valve can lead to a significantly shorter lifespan, or, in the worst case, a malfunction that could damage the valve and other parts of your system.

Q3: Will This Valve Fit into My Existing Piping Layout?

Do not feel pressured to stick with your current brand just because it fits. Many manufacturers offer innovative solutions for various lay lengths, so explore all options instead of just defaulting to what seems easier.

Q4: Do You Need Specialty Tools for Maintenance?

It is inconvenient to carry unique tools for single tasks. Ensure that your valve can be maintained with standard tools. Some manufacturers require specialized seat removal tools, which may not be practical for the average operator.

Q5: Will Your Personnel Receive Complimentary Factory-Qualified Training?

Control valves are not overly complicated, and when trained, operations personnel can maintain them effectively. Ensure you are not reliant on additional service costs by requiring a factory-trained representative on-site during commissioning to train your staff on routine maintenance and troubleshooting.

Q6: Does Your Valve Have a Solid Warranty?

A strong warranty is important, with three years generally being the standard to protect against manufacturing faults.

Q7: Can I Make Changes to the Valve if Required?

Having a valve that is "expansion-ready" for future needs can save costs and simplify future decisions. Check if it's easy to add components like limit switches or position indicators, or if relocating the pilot system is feasible.

Q8: Does Your Valve Meet Industry Standards?

Third-party accreditations ensure that your valve meets the correct specifications. Verify approvals for standards such as NSF 61, WRAS, UL/FM, AWWA, ISO, etc. These accreditations guarantee lead content compliance, bacterial growth tests, and functional tests.

Q9: Do You Have Local and Factory Support?

It’s vital to have factory-trained support in your area for assistance with questions or problems. When a valve fails, timely support is critical; knowing who to contact in advance is essential.

Q10: Is the Valve Solution Offered Able to Handle Future Needs?

In the era of "low bid wins," suppliers might offer smaller valves to reduce costs. Ensure the proposed solution will meet your needs for the foreseeable future without incurring additional costs for replacements.

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