Cornerstone Valve — Severe Service Engineering
Who We Are

About Us

Engineered to Order. Built to Last.

Proudly American, Cornerstone Valve has been at the forefront of American Manufacturing for over 30 years. Born as innovators, we spearheaded the early commercialization of custom engineered valves tailored for the most demanding service applications. Today, our reputation as a leading manufacturer of these specialized ball valves is unrivaled.

Every product we craft embodies the spirit of American ingenuity and quality. Our entire operation – from design to assembly – unfolds under one roof in the heart of Houston, Texas, the place we've proudly called home since 1990. Most of our suppliers hail from within the USA, many from Texas, ensuring a robust and responsive supply chain. This, in turn, guarantees our industry-leading turnaround times for made-to-order products and enables our 24×7 after-market support.

Our unwavering commitment to excellence is further underscored by our adherence to ISO 9001 quality management system standards since 1997, a testament to the high-quality craftsmanship you can expect from every Cornerstone Valve product.

When you choose Cornerstone Valve, you're not just purchasing a valve; you're buying into a legacy of American manufacturing excellence, supported by a tradition of innovation and a dedication to quality unmatched in the industry.

Houston, Texas — home of Cornerstone Valve
Headquarters

Missouri City, TX — Near Houston

Why Choose Us

What Sets Cornerstone Valve Apart

Engineered-to-order — no catalog limitations
Advanced supply chain manufacturing
Reliable designs based on Forgings
Over 30 years of reliable engineering experience
API 6D / 6A / 6D-SS certified and monogram designs
Full traceability and documentation packages
Aftermarket spares available for entire valve life
Rapid response engineering team
Our Story

A History of American Manufacturing Excellence

1990

Founded in Houston, Texas

Cornerstone Valve was established near Houston, Texas — the heart of the global energy industry. From day one, our mission was to engineer and manufacture severe service ball valves entirely on American soil.

1990s

Early Commercialization of Custom Engineered Valves

During the 1990s, drawing on deep experience in U.S. Navy applications, our team developed dependable solutions for demanding Oil & Gas markets, including cryogenic, high-pressure, corrosive, and high-temperature service. That early focus on application-specific engineering, establishing a supply chain for special metallurgies, and rigorous documentation established the practical, customer-led approach that continues to guide our work today.

1997

ISO 9001 Certification

Cornerstone Valve achieved ISO 9001 certification, formalizing our commitment to quality management and full traceability from raw material to final delivery — a standard we have maintained without interruption ever since.

2000s

U.S. Navy & Defense Programs

Our expertise in severe service applications earned us a place in U.S. Navy and defense programs, where the highest standards of reliability and documentation are non-negotiable. This heritage continues to define our engineering culture.

Today

30+ Years of Unrivaled Expertise

From 2003 through 2026, Cornerstone Valve continued to build on its severe-service engineering foundation—expanding its capabilities, strengthening its domestic supply chain, and supporting customers across demanding Oil & Gas, Power Generation, Petrochemical & Refining, Aerospace, U.S. Defense, and Waterworks applications. Today, we remain a privately held, American-owned manufacturer operating under one roof in Missouri City, Texas. Our team combines decades of application knowledge with dependable forged-material designs, rigorous documentation, and responsive aftermarket support to deliver valves engineered for long-term performance in the world’s most challenging services.

Cornerstone Valve today operates independently as an employee-owned company but our history includes the YCV/Yamatake America era, which will explain YCV markings and branding on some pictures. YCV was the corporate identity for Yamatake America, which owned and operated Cornerstone Valve. The casting marking reflects that heritage, and the corporate lineage.

Our Commitment

Quality at Every Stage

Every valve that leaves our facility undergoes rigorous inspection and testing in accordance with applicable industry standards. Our quality management system ensures full traceability from raw material to final delivery.

We maintain certifications and approvals that allow us to serve the most demanding industries — from offshore oil & gas to U.S. defense programs — with confidence and compliance.