Butterfly valves provide an effective closing method for the switching and regulation of fluids. They are the successor to traditional gate valve technology, which is heavy and difficult to install and does not provide the tight shutoff performance needed to prevent leakage and increase productivity. The earliest use of butterfly valves dates back to the late 18th century and was improved in the 1950s to a smaller, lighter design that effectively solved the problem of leakage.
Emerson's Keystone brand developed the flexible seat butterfly valve family in the 1950s, a more compact, lighter design to meet user needs for leakage and safety challenges. Butterfly valve is mainly used in low pressure, low temperature environment to replace the gate valve, such as plant utilities, building HVAC and other industrial industries need bubble class sealing conditions. It features a rubber-lined, centering disc design, which means the disc and stem are centered on the body and pipe. Disc rotation 90 completes the full closed to full open travel and can be matched with manual, electric and pneumatic actuators. The actuator controls the valve plate action to limit or allow fluid to pass through the pipeline, and the user can adjust the flow of the pipeline medium through the control system.
In response to the sustainable development policies of today's society, we reduce the dependence on metal raw materials while being lightweight and able to apply in corrosion-resistant conditions such as construction equipment, transport and cargo containers, plastic or glass-steel pipelines, and purification, ozone or demining. Keystone has developed the CompoSeal series of composite valve products, elastic seat valves made of high quality engineered composite materials to provide good internal and external chemical corrosion resistance.
With the continuous development of rubber lining elastic seat butterfly valve, its application field is further expanded. End users are able to apply it to hotter, more corrosive applications such as mildly corrosive environments, food and beverage and hot air applications. Emerson's representative product, the Keystone F990 / 920 with TFE seat, is well suited to replace other types of valves in the food and beverage industry.
However, there is still a gap in this market. Customer demand for more efficient and safer butterfly valves is driving the need for metal seated valves with tight shutoff performance, which neither gate valves nor high-performance butterfly valves can meet.
To meet these customer needs, a new valve type - tri-eccentric butterfly valve was developed and introduced to the market. According to international standards, the Triple Eccentric Valve (TOV) is the first valve capable of achieving two-way zero leakage performance, achieving zero leakage tight shutdown through metal-to-metal torque sealing and angular travel non-frictional rotation. The tri-eccentric valve can be used in extreme temperature and pressure conditions, while providing zero leakage, metal sealing.
One of the challenges faced by customers using butterfly valves today is the compatibility of the materials used with the application conditions. To address this challenge, valve manufacturers are increasingly applying new advanced technologies to the coating of valve bodies and plates, enabling them to be used in aggressive media.
Butterfly valves are not recommended for applications where large pressure drops are required. In addition, because the butterfly valve plate is located in the flow path, it cannot be used in applications requiring straight line valves. They are suitable for regulating conditions, but not for conditions requiring minimal regulation.
Butterfly valves provide an effective closing method for the switching and regulation of fluids. They are the successor to traditional gate valve technology, which is heavy and difficult to install and does not provide the tight shutoff performance needed to prevent leakage and increase productivity. The earliest use of butterfly valves dates back to the late 18th century and was improved in the 1950s to a smaller, lighter design that effectively solved the problem of leakage.
Emerson's Keystone brand developed the flexible seat butterfly valve family in the 1950s, a more compact, lighter design to meet user needs for leakage and safety challenges. Butterfly valve is mainly used in low pressure, low temperature environment to replace the gate valve, such as plant utilities, building HVAC and other industrial industries need bubble class sealing conditions. It features a rubber-lined, centering disc design, which means the disc and stem are centered on the body and pipe. Disc rotation 90 completes the full closed to full open travel and can be matched with manual, electric and pneumatic actuators. The actuator controls the valve plate action to limit or allow fluid to pass through the pipeline, and the user can adjust the flow of the pipeline medium through the control system.