MT butterfly valves are part of a range designed to meet the demands of installations where reliability, versatility and ease of integration are essential, both in manual networks and automated systems.
MT Butterfly Valve Range and Typical Applications
The MT butterfly valve range covers a wide variety of needs in hydraulic and industrial installations, combining compact design, easy installation and stable performance under continuous service conditions.
Operating Principle and Installation Advantages
A butterfly valve is a shut-off device that controls flow by means of a central disc rotating around a shaft. When the disc is positioned parallel to the flow, the valve is fully open; when rotated 90°, the disc is perpendicular to the flow, providing full shut-off.
This design offers clear advantages on site: lighter weight compared to other valve types, easy installation between flanges, low pressure loss and a competitive cost. For these reasons, butterfly valves are widely used in water networks, HVAC systems, industrial installations, auxiliary processes and applications requiring efficient flow control without structural complexity.
MT Butterfly Valve Mounting Types: Wafer and Lug
MT butterfly valves are supplied in Wafer and Lug configurations, two solutions designed to meet different installation, maintenance and safety requirements.
Wafer Mounting: Compactness and Efficiency
Wafer mounting allows the valve to be installed between flanges without dedicated fixing points. It is a compact and cost-effective solution, widely used in water and HVAC networks where quick installation and space optimisation are key.
In MT Wafer valves, the shape and position of the lugs are designed to fit different flange standards (EN 1092 PN6, PN10 and PN16, as well as ANSI Class 125/150), regardless of the specific model. This ensures compatibility and helps prevent installation errors on site.
Lug Mounting: Safety and Maintenance
Lug-type valves feature threaded lugs that allow the valve to be bolted directly to the flanges. This configuration makes it possible to remove one section of the pipeline without affecting the opposite side, an important advantage in installations where maintenance operations are anticipated or where additional structural security is required.
Seat Materials and Suitability by Application
The choice of seat material is critical to the valve’s performance in relation to the fluid, temperature and operating conditions.
EPDM, NBR and PTFE: When to Choose Each
EPDM is the most common seat material for drinking water, HVAC networks and general-purpose applications. It offers good ageing resistance, elasticity and stability across typical temperature ranges.
NBR is recommended when the fluid contains oils or petroleum derivatives, as it provides superior resistance to these media.
For more demanding applications, such as chemical products, aggressive fluids or high temperatures, the MT range includes versions with PTFE seats and coated discs, offering increased durability and stability in harsh industrial environments.
Actuation Options in the MT Butterfly Valve Range
MT butterfly valves are available with different actuation options to suit installation size and the level of control required.
Lever and Manual Gearbox
The lever handle is a practical solution for small and medium diameters. It includes a locking system to secure the disc position during operation.
For larger diameters or higher pressures, the manual gearbox makes operation easier, reduces operator effort and provides greater control during opening and closing.
Automation
MT butterfly valves can be equipped with electric or pneumatic actuators, offering precise control and efficiency in installations that require remote or frequent operation.
Electric actuation is ideal for systems that need integration with controllers, PLCs or automated management systems. It allows accurate opening and closing, programming options, valve position monitoring and overall improved control in critical or hard-to-access installations.
Pneumatic actuation is particularly suitable for industrial environments where compressed air is available. Its fast response and constant force make it ideal for applications requiring frequent opening and closing cycles, high operating speed or resistance to demanding environments, such as chemical or industrial processes.
Free Stem: What It Is and Why It Adds Value
A free stem valve is supplied without a lever, manual gearbox or actuator. It is prepared to directly receive the selected actuation system, whether pneumatic, electric or another type of automation.
This solution avoids unnecessary disassembly during installation, reduces costs and simplifies assembly. For installers and system integrators, free stem valves provide greater project flexibility and precise adaptation to remote control requirements or system integration needs.
Dimensional Range and Standards Compatibility
The MT butterfly valve range covers diameters from DN40 to DN600, providing solutions for both compact installations and large pipelines.
Dimensions, Pressure Ratings and Standards
MT butterfly valves are designed to operate at nominal pressures PN6, PN10 and PN16, and comply with EN 1092 and ANSI B16.5 Class 125/150 standards, depending on the model. Face-to-face dimensions follow EN 558-1 (Series 20), making replacement or integration into existing installations straightforward without additional modifications.
In addition, MT Valves & Fittings offers specific ANSI-certified models for installations requiring compliance with international or US standards. This range enables distributors and installers to rely on compatible and dependable solutions across different markets.
A Range Designed for Professionals and Distribution Channels
MT butterfly valves combine technical design, a wide variety of configurations and a clear offering tailored to both professionals and points of sale.
Clear Solutions for Error-Free Selection
The availability of multiple combinations of body, seat, disc and actuation allows the correct valve to be selected according to the fluid, environment and intended control system. For distributors, this clarity simplifies stock management and reduces issues caused by incorrect product selection.
With the introduction of the free stem version, MT expands its offering while maintaining the reliability and practical approach that characterise its entire butterfly valve range.
Consult our catalogue to explore all available butterfly valve versions and select the solution that best suits your project.
