What It Means to Be on an End User’s Approved Manufacturer List (AML)
Refining, chemical, and other industrial processing facilities operate under extreme pressure, high temperatures, and strict environmental regulations. They rely on high-performance flow control equipment to prevent unplanned downtime and protect worker safety.
That’s where an approved manufacturer list, or AML, comes in. If you’ve heard the term used internally but are unsure exactly what it means, here’s a look at what it takes for a valve manufacturer to earn AML status and why it matters.
What Is an Approved Manufacturers List?
An approved manufacturer list is a vetted roster of suppliers that a company has cleared to provide a specific part or material.
The list exists to manage risk. A manufacturer that can produce one valve that meets spec is one thing. Repeating that result reliably, batch after batch, is another—and it’s that track record of consistency, not just the ability to make a compliant valve, that AML approval is meant to verify.
One detail that surprises newer buyers: AML approval is usually tied to a specific manufacturing location, not just a company name, so a supplier’s status on an end user’s approved manufacturers list isn’t automatic or permanent.
What It Takes to Get on an End User’s AML
Creating an approved manufacturer list starts with a documentation review, where the end user examines a manufacturer’s quality systems, material certifications, and testing procedures. From there, most companies conduct an audit, either in person or virtually, of the actual production facility. Many companies also rely on third-party testing standards, such as API RP 591, to independently verify a valve design rather than take a manufacturer’s word for it.
Getting listed isn’t a one-time thing. Facility changes, ownership changes, or a lapse in quality can trigger a fresh review, so staying on an end user’s AML takes ongoing performance, not just a strong first impression.
Quality Audits at KITZ
For KITZ, getting on an end-user AML often involves thorough quality audits conducted in person at our factories. Larger companies typically send representatives to inspect one of our many global manufacturing facilities firsthand, while smaller companies sometimes rely on a prior audit conducted by another qualified company instead.
We welcome this level of scrutiny. Opening our facilities to direct, in-person inspection is how KITZ backs up our AML status with more than a claim on paper, letting end users verify our production standards for themselves.
Why AML Status Matters for Distributors and Procurement Teams
When a manufacturer holds AML approval, much of the vetting work is already done. That’s the practical payoff for distributors and procurement teams: faster specification, fewer redundant audits, and confidence that AML certification valves perform the same way order after order.
This isn’t only relevant for the most demanding, severe-service applications. The same core components and quality standards run through the manufacturer’s entire product line—they don’t change between a routine shutoff valve and a specialty configuration.
KITZ’s AML Status: What Near-Universal Approval Signals
KITZ Corporation of America is on the approved manufacturer list of nearly every major industrial producer in the world, a distinction few valve manufacturers can claim. That track record traces back to our vertically integrated manufacturing: We control our own castings, machining, assembly, and in-house testing, which is built into every stage before a valve ships. Explore our full industrial product lineup.
Tier One Valve Manufacturer
In the valve industry, Tier One describes manufacturers that meet the highest, most consistent quality standards, not just the minimum needed to pass. Few manufacturers hold that distinction, and fewer still can back it up with a spot on nearly every end user’s AML.
KITZ is a Tier One AML valve manufacturer. We own our foundries, pour our own metal, design our own tooling, and control every step of production from casting through final testing. If a valve fails our internal standard before it ships, we melt it down and start over. That level of oversight is what separates a true Tier One manufacturer from all others.
Partner With an AML Valve Manufacturer
Being listed on an approved manufacturer list is a signal that a supplier’s quality has already been tested and verified, which simplifies sourcing for procurement teams and distributors alike. KITZ’s near-universal AML status is backed by:
- Tight quality control. Every stage of production, from casting to final testing, stays in-house. Our Industrial Division conducts 100% API 598 bubble-tight testing on every valve before it leaves the facility.
- A broad range of specialty alloys. Our valve lines cover brass, bronze, carbon steel, stainless steel, ductile iron, and exotic alloys.
- Global engineering support. KITZ maintains international engineering and sales offices, and our U.S. office in Houston, Texas, provides on-site valve engineering services such as specialty cleaning and modifications using OEM parts.
- Ongoing sustainability initiatives. Every KITZ valve is low-emission, and we continue to spearhead sustainability initiatives across our manufacturing facilities.
- A customer service mindset. Timely, responsive support is treated as a core part of the buying experience.
Ready to source valves from a manufacturer companies already trust? Request a quote or contact us today.