M.A. Stewart & Sons Ltd. (MAS) is a leading master distributor of pipes, valves, fittings (PVF), and automation solutions, delivering high-quality products and technical expertise to industrial and commercial markets across North America and beyond. Founded in 1955 and headquartered in Canada, MAS has built a strong reputation for reliability, product availability, and long-term partnerships with world-class manufacturers.

With decades of experience, MAS provides comprehensive flow control solutions, supporting critical operations in industries that demand performance, safety, and compliance.

From selection to pricing, our qualified team is ready to support you—request your quote today.

M.A. Stewart butterfly valves deliver efficient flow isolation and modulation across a wide range of industrial systems. As part of a comprehensive PVF and flow control portfolio, these valves are designed to provide reliable performance, compact design, and cost-effective operation in both standard and demanding service conditions.

Butterfly valves operate using a quarter-turn rotating disc, enabling fast opening and closing with low torque requirements, making them ideal for large-diameter pipelines and applications where space and weight are critical.

M.A. Stewart ball valves provide durable, high-performance flow isolation solutions for a wide range of industrial and commercial applications. Designed for quarter-turn operation, these valves ensure fast opening and closing, tight shutoff, and minimal pressure drop, making them ideal for systems requiring reliable on/off control.

Engineered with a precision-machined ball and resilient seating materials (PTFE/RPTFE), MAS ball valves deliver bubble-tight sealing and long service life, even under demanding operating conditions.

From selection to pricing, our qualified team is ready to support you—request your quote today.