The butterfly valve is a versatile type of valve used in industrial pipelines to direct, stop, or control the flow rate of fluids such as liquid, gas, or steam, operating on the principle of a rotating disc (flap). Its basic operating mechanism relies on the disc-shaped flap within the valve body rotating up to 90 degrees around the shaft axis to bring the flow to a fully open or fully closed position. Thanks to this simple yet effective design, butterfly valves are an ideal solution for both opening-closing and partial flow adjustment.
Due to their compact structure, they can be easily integrated into narrow spaces. This feature provides a significant advantage, especially in industrial facilities where space is limited. Their body structure, flange connection details, and smaller disc sizes make butterfly valves a more ergonomic option compared to ball or gate valves. Additionally, their relatively lighter weight offers practicality in transportation, installation, and maintenance operations.
One of the most important advantages of butterfly valves is their operation with low pressure loss. The resistance formed within the fluid line is kept to a minimum, contributing to the overall energy efficiency of the system. At the same time, they offer high performance in terms of system safety and fluid control by providing high sealing in both open and closed positions. When suitable seal materials are used, they can withstand even in harsh chemical environments.
The rise of this valve type in the industry began in the 1960s and became more widespread with the developing manufacturing technologies in the following decades. Thanks to modern manufacturing techniques, parts such as the body, shaft, flap, and seal can be produced in various material combinations and customized according to specific process needs. This makes butterfly valves safely usable not only in standard fluid flow systems but also in acidic, corrosive, high-temperature, or particulate fluid lines.
Moreover, the integration of butterfly valves into automation systems is quite easy. When equipped with electric or pneumatic actuators, they offer remote control capability, adapting to the central monitoring and control infrastructures in industrial facilities. In this respect, they are a preferred equipment for automatic control scenarios in sectors such as energy, petrochemicals, food, water treatment, and HVAC.
All these technical and operational advantages make butterfly valves one of the ideal valve solutions offering high efficiency in terms of both initial investment costs and operational continuity.
Butterfly valves are widely used in various industrial and infrastructure systems requiring fluid control. Thanks to their structural advantages, this valve type offers reliable performance in both low and high-pressure applications, as well as in both clean and dirty fluid lines. With their compact structure, low maintenance needs, easy installation capability, and automation-compatible design, they have become an indispensable component of engineering systems in different sectors.
Fire extinguishing systems are among the primary areas where butterfly valves are most frequently used. In these systems, butterfly valves play a critical role in terms of both safety and continuity, thanks to their quick opening-closing feature, low pressure loss, and bidirectional sealing advantages. Similarly, in water supply and wastewater discharge lines in municipal infrastructures and construction projects, butterfly valves offer an ideal solution in terms of flow control and line safety. Their small footprint in pipelines allows them to be used effectively even in tight spaces.
In HVAC (Heating, Ventilation, and Air Conditioning) systems, butterfly valves are used to direct heating-cooling fluids in both hot and cold lines. The ability to make precise flow adjustments in these systems makes butterfly valves a preferred choice in terms of comfort and energy efficiency. In power plants, these valves are used for controlling different environments such as process water, steam, air, and gas. Their structures, which can provide stable performance even under high temperature and pressure, support process safety.
In treatment plants, butterfly valves play a role in many points such as fluid direction, tank outlet control, and chemical dosing in both physical-chemical and biological treatment processes. In these areas, where chemical resistance is a priority, the selection of the correct seal and flap material directly affects the success of the process. Especially models with PTFE or Viton seals show high resistance against aggressive chemicals.
In the shipbuilding industry, butterfly valves are widely preferred to meet the need for flow control in limited spaces. They can be applied with various body and seal combinations for different environments such as fuel, ballast water, cooling water, and exhaust gas. Additionally, choosing a stainless flap to counteract corrosion caused by seawater can extend the life of the valve.
In chemical and petrochemical plants, chemically resistant versions of butterfly valves are used in lines where reactive and abrasive substances are transported. In these environments, material selection directly affects not only system performance but also plant safety. In the food industry, butterfly valves are used in both production and cleaning processes. Especially hygienic design stainless steel valves are preferred in production lines of dairy products, beverages, and other food products due to their CIP (Cleaning in Place) compatibility.
In the paper and pulp industry, where it is necessary to work with highly viscous or particulate fluids, the high durability body and flap structures of butterfly valves come to the forefront. In these environments, wear resistance is as critical as sealing.
In all these different application areas, the selection of butterfly valves is not limited to the valve type alone. Parameters such as the temperature range of the fluid, its chemical structure, the pressure value in the system, the frequency of valve use, and the need for cleanability should be carefully considered when determining the seal material (PTFE, EPDM, NBR, Viton), flap type (stainless steel, cast, coated), and body structure (GG25, GGG40, etc.).
The correct selection of butterfly valves directly affects the efficient and safe operation of the system, while incorrect or insufficient material selection can lead to serious consequences such as sealing problems, system shutdowns, or even safety risks. Therefore, when evaluating the usage areas of butterfly valves, not only physical suitability but also technical requirements should be considered.
Types of Butterfly Valves
Butterfly valves are mainly divided into two types based on their general design features and installation methods: Wafer type and Lug type. This classification is an important engineering criterion that directly affects how the valve is mounted to the pipeline and the maintenance-access possibilities within the system. Both types have their unique advantages and usage scenarios. Therefore, when selecting a valve, not only the properties of the fluid but also the maintenance strategy, installation conditions, and operating scenario of the system should be considered.
Wafer Type Butterfly Valves
As the name suggests, wafer type butterfly valves are compact valve models mounted as an "intermediate piece" between flanges. In this design, the valve body is clamped between two flanges and is usually held in place by long bolts connecting both flanges. This installation method not only simplifies the assembly but also saves space in the system. Wafer type valves are preferred especially in in-plant piping systems with limited space, narrow cabinet applications, and low to medium pressure fluid lines.
Although this valve type is mostly used in unidirectional flow systems, bidirectional sealing can also be achieved when the seal and flap design are properly configured. This allows the valve to operate safely under both positive and negative pressure conditions. Additionally, wafer type butterfly valves provide an economical advantage due to their low-cost solution in projects requiring high quantities. However, in applications where valve removal or segment maintenance operations are needed along the line, they do not offer as much flexibility in terms of maintenance ease as lug type valves.
Lug Type Butterfly Valves
Lug type butterfly valves have a more advanced connection system. The "lug" like protrusions on both sides of the valve body allow each flange to be fixed separately with bolts. This structural feature allows the valve to be independently removed and installed in the pipeline. Its biggest advantage is that it allows valve replacement or maintenance to be performed by isolating only one line segment without shutting down the entire system. This feature is of great importance, especially in industrial facilities where uninterrupted production is mandatory.
Lug type butterfly valves are preferred in systems requiring both bidirectional flow control and segment-based intervention. The flange connection provides high mechanical strength and ensures safe installation in long pipelines. It is also a preferred structure in actuator models, and its integration with automation systems is quite stable and reliable.
Both wafer and lug type butterfly valves can be adapted to acidic, abrasive, or high-temperature environments depending on the material and seal options. When suitable material combinations are selected, both types offer long-lasting and high-performance solutions.
Important Considerations in Type Selection
The selection of valve type is not limited to the physical connection type alone. Many factors such as system pressure, fluid properties, valve opening-closing frequency, maintenance ease, and the cost of system shutdowns play a role in the decision-making process. For example, choosing a lug type in a system requiring frequent maintenance provides operational advantages, while a wafer type can be an economical and sufficient solution in fixed and low-maintenance lines.
Both types have actuator versions available. In addition to the manual lever mechanism, they can be equipped with pneumatic or electric actuators and integrated into automation systems. This ensures precise and remote-accessible flow control in applications requiring central control, such as power plants, chemical plants, and HVAC systems.
Truevalve Butterfly Valve Solutions
Truevalve branded butterfly valves offered to the industry by Ekin Industrial are among the professional valve solutions designed according to high engineering standards, customizable according to various process needs, and standing out with their technical durability and sealing performance. Developed to suit the challenging process conditions encountered in industrial applications, these valves are fully compatible with automation systems and offer high control capability in manual use.
The Truevalve butterfly valve series is produced with high-strength body materials such as GGG40 (ductile iron) and GG25 (gray cast iron). These materials provide resistance to mechanical impacts and safe use against deformation under high temperature and pressure. Thanks to the casting quality, surface smoothness, and coating technology in the body, minimum turbulence and friction resistance occur on the inner surface of the valve. This situation reduces pressure loss in the system while also preserving the cleanliness of the fluid.
AISI 420 stainless steel is used as the valve shaft. This material is one of the most commonly preferred steel classes in industrial fluid lines in terms of both strength and corrosion resistance. Long-term sealing is ensured with precise workmanship and seal compatibility at the connection points of the shaft with the disc. Additionally, products can be customized with different flap (disc) options. GGG40, AISI 304, and AISI 316 stainless steel flap options adapt to the chemical, mechanical, and thermal requirements of different sectors.
Truevalve butterfly valves have a maximum working pressure of 16 bar and a temperature resistance range of 120 °C to 180 °C depending on the model. With these features, they can be safely used in both low and medium-high pressure systems. They offer uninterrupted performance in different engineering fields such as heating-cooling lines, water and steam systems, chemical processes, HVAC applications, and food production facilities.
In terms of seal material, Truevalve products offer a wide range. The seal options used are as follows:
PTFE (Polytetrafluoroethylene):
Exhibits excellent resistance to chemicals, has high temperature tolerance. Used in systems containing acids, bases, and solvents.
EPDM (Ethylene Propylene Diene Monomer):
Preferred in water, steam, and mild chemical environments. Known for high elasticity and UV resistance.
NBR (Nitrile Rubber):
Offers superior performance in contact with oil and petroleum derivatives. Commonly used in hydraulic systems.
Viton (FKM):
Preferred in systems operating under abrasive chemicals, high temperature, and heavy industrial conditions.
Thanks to these seal options, users can choose the most suitable solution according to the type, temperature, and application environment of the fluid. Additionally, the seals provide bidirectional sealing by contacting both the inner surface of the body and the flap surface. This creates a critical advantage in terms of process safety.
The Truevalve butterfly valve product range includes not only classic lever (manual) models but also gearboxes, pneumatic actuators, and electric actuators. This allows the valves to be integrated into automation systems and remotely managed through central control systems. While electric actuators generally offer 220V or 24V DC operating options, pneumatic actuators can be of double-acting or spring return type.
Additionally, Truevalve butterfly valves offered with different mechanical structures such as double-flanged, wafer type, lug type, PTFE coated, provide flexible solutions according to installation method, space constraints, and maintenance needs.
In conclusion, Truevalve butterfly valves offer reliable solutions that meet both technical and operational needs of different sectors with their material quality, variety, sealing performance, and automation support. These products, supplied with the assurance of Ekin Industrial, stand out as an ideal choice for long-lasting and sustainable operational processes.
Actuated Butterfly Valve Options
The Truevalve butterfly valve product group is not limited to manual lever models. To respond to the evolving needs of industrial automation, gearboxes, pneumatic actuators, and electric actuator butterfly valve options are also included in the extensive product range. These models offer significant advantages, especially in applications where processes are integrated into central control systems, requiring remote intervention and quick response time.
Gearbox models allow manual operation to be performed more controlled and with less force. In large diameter valves or high-pressure systems, direct lever use may not be sufficient, so torque is increased through gearboxes to provide easier operation. It also allows precise adjustment of the valve position.
Pneumatic actuator butterfly valves perform the opening-closing operation using compressed air. They can be easily integrated into compressed air systems widely used in industrial facilities. These models are available in double-acting or spring return configurations. Double-acting actuators require air pressure for both opening and closing operations; in spring return actuators, the valve automatically returns to a predetermined position when the air is cut off. This feature is of great importance in terms of emergency scenarios in systems requiring safety.
Electric actuator models are configured to operate with 220V AC or 24V DC supply voltages. Electric actuators are preferred in applications that need to be managed from automation panels, PLC systems, or central monitoring systems like SCADA. They can be equipped with additional features such as position feedback, open-closed position indicator, torque adjustment, and emergency shutdown function. This allows the user not only to open and close the valve but also to remotely monitor the overall condition of the system.
Actuated valves are widely used in many different industrial areas, primarily in the chemical, petrochemical, energy, food, treatment, pharmaceutical, HVAC, and maritime sectors. For example, in a power plant where process continuity is critical, valve opening-closing operations in hot water or steam lines are performed remotely with electric actuators, reducing human intervention and increasing process safety. In food facilities, automatic flow control can be provided between CIP (cleaning in place) systems with pneumatic actuators.
Truevalve butterfly valves, designed with high-quality shaft structure and flap-shaft connection detail considering actuated usage scenarios, safely carry the mechanical loads from actuators. Both the gearbox and actuator adapter flanges are designed in compliance with standards and optimized to ensure full compatibility with actuators of different brands and models.
All these features make Truevalve butterfly valves not only for manual systems but also flexible and future-oriented solutions that can integrate with the automation infrastructures of digitalizing production environments. Thus, modern industrial expectations such as process safety, energy efficiency, quick response, and remote monitoring are fully met.
Double-Flanged Butterfly Valves
In industrial fluid systems where factors such as high pressure, large pipe diameter, intense vibration, or aggressive environmental conditions are present, valve connection security and body durability are of vital importance. In such challenging applications, Truevalve double-flanged butterfly valves stand out with their mechanical robustness and high sealing capacity. Thanks to the flange connection being directly integrated into the body on both sides, maximum connection stability and mechanical strength are achieved in the system.
The double-flanged butterfly valve design is generally preferred in heavy-duty systems. The flange structure, which has a larger surface area compared to other types of valves, ensures equal distribution of stress at the connection points. This minimizes sealing problems that may arise from axial misalignments or installation errors in long pipelines. Additionally, the double-flange structure offers centering ease during installation and allows the valve to be positioned correctly on the axis.
Truevalve double-flanged models are produced with GGG40 ductile iron body, offering high impact resistance and long-lasting structure. Ductile iron material, with its high tensile strength and resistance to deformation, can be safely used especially in vibrating lines. The valve flap can be produced from AISI 304, AISI 316, or coated stainless material according to preference. This ensures long-lasting use in both hygienic processes required by the food and beverage industries and in chemical and treatment plants where abrasive chemicals are present.
In terms of sealing, Truevalve double-flanged butterfly valves can be equipped with high-quality seal alternatives such as PTFE, EPDM, NBR, and Viton. These seal options can be determined according to the chemical structure of the fluid, temperature range, and the hygiene requirements of the process. Especially models with PTFE seals are preferred in lines requiring high temperature and chemical resistance. The wide surface contact area between the seal and the flap and body provides bidirectional sealing and allows the valve to operate safely under both positive and negative pressure.
Truevalve double-flanged butterfly valves offer not only static strength but also high flexibility in terms of automation integration. In addition to the manual lever mechanism, they can be equipped with a gearbox, pneumatic, or electric actuator and integrated into the control infrastructure of the system. This allows the valve to be remotely controlled from central SCADA or PLC systems; the position and status of the valve in the system can be continuously monitored.
This product group is widely used especially in the following sectors:
• High-capacity water treatment and wastewater recovery plants
• Industrial steam and hot water systems
• Chemical and petrochemical process lines
• Food and beverage production facilities (CIP/SIP systems)
• Energy production plants and cogeneration lines
• Ship and maritime applications
• Paper, cement, and mining industries
The common need in all these sectors is for the valve to operate without deformation for a long time, to have low maintenance requirements, and to continuously ensure process safety. Truevalve double-flanged butterfly valves not only meet these expectations but also provide installation ease and system integrity to the user with their aesthetic and standard-compliant design.
Conclusion: Safe, Economical, and Flexible Flow Control
The safe, stable, and efficient management of fluids in industrial processes is a critical factor that directly affects the success of the entire system. At this point, butterfly valves stand out as one of the most efficient solutions for flow control thanks to their compact structure, low operating cost, minimal maintenance requirement, and wide application flexibility. These valves, capable of providing quick opening-closing with their disc structure, also offer suitable solutions for flow adjustment. Their ability to save space in narrow areas and operate with low torque makes them ideal for systems aiming for high efficiency.
In addition to wafer and lug types, double-flanged structures and automation-compatible versions, butterfly valves are safely used in many different sectors from water and wastewater treatment to energy production, chemical processes to HVAC systems, food production lines to shipbuilding industry. This wide range of use reveals that the product is not just a simple valve but also a strategic equipment contributing to the safety and sustainability level of the system.
The correct material selection in butterfly valves directly affects sealing success and valve life. Therefore, every element from flap material to shaft structure, seal type to body metal should be optimized according to process conditions. AISI 304 or AISI 316 stainless steel flap options, PTFE, EPDM, NBR, or Viton high-performance seal alternatives can be diversified according to different temperature and chemical resistance requirements to provide the most suitable configuration.
Truevalve branded butterfly valve solutions are a product group developed with the engineering experience and quality approach of Ekin Industrial, understanding and meeting process needs correctly. Thanks to the high-quality casting materials, precise workmanship, and detailed quality control mechanisms used in the production processes, the products meet high-level expectations in terms of both performance and longevity.
Additionally, Truevalve products go beyond manual use, offering solutions that can be fully integrated into automation with pneumatic and electric actuator options, remotely controllable and monitorable. This allows users to gain not only operational efficiency but also process safety and digitalization.
In conclusion, butterfly valves are not just a flow control equipment but a part of sustainability, safety, and operational excellence in modern industrial facilities. Truevalve butterfly valves embody this approach, offering user-oriented, durable, and flexible solutions designed with high engineering quality.
Truevalve butterfly valves offered with the assurance of Ekin Industrial establish the control of your systems on solid foundations.