Description
M-Z Controls M55 Series Three-Piece Ball Valves
The M-Z Controls M55 Series is a versatile line of full-port, three-piece ball valves engineered for dependable flow isolation in general industrial and chemical-processing applications. Its full-port design minimizes flow restriction and pressure drop, making the M55 well suited for process piping, chemical feed systems, water-treatment equipment, industrial utilities, and automated skid systems.
The three-piece swing-out body allows convenient in-line inspection and maintenance without removing the valve’s end connections from the piping system. An investment-cast body, blowout-proof stem, reinforced seating options, and durable stainless-steel trim provide reliable operation in demanding service conditions.
M55 Series valves are available in sizes from 1/4 inch through 4 inches with CF8M stainless-steel or WCB carbon-steel body construction. A wide selection of threaded and welded end connections makes the valve adaptable to new installations, equipment packages, and replacement applications.
Key Features
- Three-piece swing-out body for easier in-line maintenance
- Full-port flow path minimizes pressure loss
- Available in sizes from 1/4″ through 4″
- Class 600 construction
- Pressure ratings up to 1,000 psi, depending on material, size, and operating temperature
- CF8M stainless-steel or WCB carbon-steel body
- 316 stainless-steel or CF8M ball
- Blowout-proof 316 stainless-steel stem
- Standard RTFE seats
- Optional PTFE, TFM™-1600, 50/50 STFE, and CTFE seats
- Investment-cast body construction
- ISO 5211 direct-mount actuator interface
- Manual, gear-operated, pneumatic, and electric-actuated configurations available
Available End Connections
- Threaded NPT
- Socket weld
- Extended socket weld
- Butt weld
- Extended butt weld
- NPT × socket weld
- NPT × butt weld
- NPT × extended butt weld
- Valve body without end connections
Standards and Certifications
The M55 Series is designed and tested in accordance with applicable industry standards, including ASME B16.34, ASME B16.11, ASME B16.25, ASME B1.20.1, ISO 5211, and API 598. Available documentation includes EN 10204 Type 3.1 material certification, with PED compliance available for applicable configurations.
Typical Applications
- Chemical-processing systems
- Industrial water and wastewater treatment
- Reverse-osmosis and filtration skids
- Chemical feed and transfer equipment
- Process piping and utility systems
- Equipment isolation and shutoff
- Automated flow-control assemblies
- OEM machinery and packaged process equipment
With its broad selection of materials, seat options, end connections, and automation packages, the M-Z Controls M55 Series provides a flexible and serviceable ball-valve solution for demanding industrial flow-control applications.
Always confirm valve materials, seat compatibility, and pressure-temperature limits for the intended process fluid and operating conditions.


