In this article, we’ll explore the benefits and drawbacks of different butterfly valves, helping you make informed decisions when choosing the right valve for your specific application. Let’s dive in and discover the advantages and disadvantages that will guide your valve selection process.
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A butterfly valve is a crucial component in fluid control and regulation. It’s a simple yet effective valve that can start, stop, and regulate the flow of various fluids within pipelines. With its unique design and functionality, the butterfly valve has entered various industries, from water treatment and chemical processing to HVAC systems.
Improper use of industrial valves can be catastrophic. Indeed, the chemical industry should have learned some important lessons from the Phillips 66 Houston Chemical Complex explosion and fire in 1989. This accident, which resulted from extremely flammable process gases escaping during regular maintenance operations on one of the plant's polyethylene reactors, helped revolutionize the design, safety standards and maintenance requirements for different industrial valves. The standards include teaming process engineers with manufacturers to optimize valve designs. The aim is to ensure they meet the desired valve performances and contain adequate fail-safe mechanisms to avert accidents.
In the Phillips 66 incident, isolation valves were closed and compressed air hoses that actuated them physically disconnected as a safety measure according to the Occupational Safety and Health Administration investigation. The air connections for opening and closing this valve were identical and had been improperly reversed when reconnected.
Industrial butterfly valves have fail-safe designs and lockout systems that minimize human errors and media-initiated stresses that can cause workplace and environmental accidents.
Industrial butterfly valves are expected to control fluid flow in different pipe configurations while preventing media leakage to downstream processes and the atmosphere around their bodies and connection points.
There are several components in a butterfly valve that enable its effective operation. The metal disc, commonly referred to as the butterfly is the most important component. The disc is always present in the path of flow. This means that the flow control mechanism continuously induces a slight pressure drop in the piping system. Butterfly valves use compact internal designs to limit the pressure drop and improve their responsiveness for optimal pressure recovery and optimized flow coefficients when conveying different fluid media.
Butterfly valves are vital for several industrial applications, including petrochemical processing. These valves can start or stop the flow, regulate and isolate fluids in pipelines and prevent backflow.
Fluid flow past the butterfly valve is controlled by manipulating the position of the disc. The position of the disc provides a full or partial bore for desired fluid control. Some butterfly valves can provide restricted passage by opening at an angle below 90 degrees. In restricted passage mode, only smaller amounts of the fluid will pass through. Maximum flow is achieved when the lever turns a full 90 degrees.
Butterfly valves can be used for modulating flow. For this purpose, they could be designed to obtain linear or equal percentage characteristics.
Near linear
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Linear percentage characteristic means that if the valve is opened to about N% of the full turn, the flow rate through will also be N% of the maximum flow rate. So, if the degree of opening is at 40% of 90 degrees, the flow rate will be 40% of the maximum flow rate.
Quick opening
This means there is a rapid increase in the flow rate as the opening angle is increased incrementally from the closed position.
There are different design standards for butterfly valves, such as API 609, ISO 5752, and can be categorized under the following:
1. Disc closure
Disc closure is a function of the valve stem. The valve stem location, relative to the disc and the surface angle of the seat, forms the bedrock of different disc closure designs.
Concentric
In this type of butterfly valve, the stem is located at the centerline of the disc, which is also at the center of the bore. It has zero offsets and can also be referred to as a resilient-seated valve.
Resilient-seated butterfly valves are suitable for flow systems with low pressure and low temperatures, such as water lines.
Eccentric
In eccentric butterfly valves, the stem is not located at the centerline of the disc. Eccentric valves can be single offset, double offset or triple offset. The triple offset valve is like the double offset but with a third offset. The stem passes behind the disc and is slightly offset from the disc centerline.
In this article, we’ll explore the benefits and drawbacks of different butterfly valvesbutterfly valves, helping you make informed decisions when choosing the right valve for your specific application. Let’s dive in and discover the advantages and disadvantages that will guide your valve selection process.
A butterfly valve is a crucial component in fluid control and regulation. It’s a simple yet effective valve that can start, stop, and regulate the flow of various fluids within pipelines. With its unique design and functionality, the butterfly valve has entered various industries, from water treatment and chemical processing to HVAC systems.
Improper use of industrial valves can be catastrophic. Indeed, the chemical industry should have learned some important lessons from the Phillips 66 Houston Chemical Complex explosion and fire in 1989. This accident, which resulted from extremely flammable process gases escaping during regular maintenance operations on one of the plant's polyethylene reactors, helped revolutionize the design, safety standards and maintenance requirements for different industrial valves. The standards include teaming process engineers with manufacturers to optimize valve designs. The aim is to ensure they meet the desired valve performances and contain adequate fail-safe mechanisms to avert accidents.
In the Phillips 66 incident, isolation valves were closed and compressed air hoses that actuated them physically disconnected as a safety measure according to the Occupational Safety and Health Administration investigation. The air connections for opening and closing this valve were identical and had been improperly reversed when reconnected.
Industrial butterfly valves have fail-safe designs and lockout systems that minimize human errors and media-initiated stresses that can cause workplace and environmental accidents.
Industrial butterfly valves are expected to control fluid flow in different pipe configurations while preventing media leakage to downstream processes and the atmosphere around their bodies and connection points.
There are several components in a butterfly valve that enable its effective operation. The metal disc, commonly referred to as the butterfly is the most important component. The disc is always present in the path of flow. This means that the flow control mechanism continuously induces a slight pressure drop in the piping system. Butterfly valves use compact internal designs to limit the pressure drop and improve their responsiveness for optimal pressure recovery and optimized flow coefficients when conveying different fluid media.
Butterfly valves are vital for several industrial applications, including petrochemical processing. These valves can start or stop the flow, regulate and isolate fluids in pipelines and prevent backflow.
Fluid flow past the butterfly valve is controlled by manipulating the position of the disc. The position of the disc provides a full or partial bore for desired fluid control. Some butterfly valves can provide restricted passage by opening at an angle below 90 degrees. In restricted passage mode, only smaller amounts of the fluid will pass through. Maximum flow is achieved when the lever turns a full 90 degrees.
Butterfly valves can be used for modulating flow. For this purpose, they could be designed to obtain linear or equal percentage characteristics.
Near linear
Linear percentage characteristic means that if the valve is opened to about N% of the full turn, the flow rate through will also be N% of the maximum flow rate. So, if the degree of opening is at 40% of 90 degrees, the flow rate will be 40% of the maximum flow rate.
Quick opening
This means there is a rapid increase in the flow rate as the opening angle is increased incrementally from the closed position.
There are different design standards for butterfly valves, such as API 609, ISO 5752, and can be categorized under the following:
1. Disc closure
Disc closure is a function of the valve stem. The valve stem location, relative to the disc and the surface angle of the seat, forms the bedrock of different disc closure designs.
Concentric
In this type of butterfly valve, the stem is located at the centerline of the disc, which is also at the center of the bore. It has zero offsets and can also be referred to as a resilient-seated valve.
Resilient-seated butterfly valves are suitable for flow systems with low pressure and low temperatures, such as water lines.
Eccentric
In eccentric butterfly valves, the stem is not located at the centerline of the disc. Eccentric valves can be single offset, double offset or triple offset. The triple offset valve is like the double offset but with a third offset. The stem passes behind the disc and is slightly offset from the disc centerline.