Masoneilan® has been a major pioneer in the valve and process control industry for over a century. Originally founded in 1882 by a young inventor named William B. Mason, Masoneilan has continuously provided unparalleled technical leadership and developed innovative ideas and solutions.


Masoneilan provides customers with the highest quality products and services through unmatched creativity and commitment to excellence.  

Masoneilan products include process control valves, actuators, instruments, and associated software solutions. Products and services are provided globally with manufacturing plants and sales offices located worldwide. 

Reciprocating Products

Masoneilan provides a broad range of linear stem motion control valves.

This diverse portfolio 

includes globe style valves, angle valves, and special application valves.


Rotary Products
Masoneilan provides a broad range of rotary motion control valves. This portfolio includes unique self-aligning eccentric plug designs, featuring integral bonnets, adjustable capacity, and corrosion resistant configurations.



Pneumatic Actuators 

Masoneilan provides a broad range of pneumatic actuation solutions, including various spring diaphragm and piston/cylinder designs.




Masoneilan provides various types of control and measurement instrumentation for use with control valves and pneumatic actuators. The product portfolio includes pneumatic and electro-pneumatic positioners, I/P transducers, level control devices, and Smart instruments.



Engineered Specials

Masoneilan provides a wide range of engineered solutions using field proven technologies and application expertise. Conventional designs do not generally provide the optimum solution for peak performance and equipment longevity in these types of applications. 




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Flow meter Calibration Workshop