Wiktor Wise
When sizing electric butterfly valve actuators, it is important to consider the specific system components and requirements. Electric actuators are a versatile option for butterfly valves as they can be programmed to respond to specific signals and can be controlled remotely. They are also relatively energy efficient and simple to maintain. However, they are not suitable for moist or explosive environments. When selecting an electric actuator, it is crucial to evaluate the configuration of the system, including the valve body, stem, and bolt patterns. Additionally, the duty cycle, which is the ratio of the time taken for actuation (on time) to off time, should be considered based on the frequency of operation. Electric actuators typically have a shorter duty cycle compared to hydraulic actuators. The speed of the actuator will depend on the specific system requirements. It is also essential to ensure that the electric actuator meets international standards to prevent premature breakage and potential damage to the system.
| Characteristics | Values |
|---|---|
| Power source | Manual butterfly valves do not require an external power source, unlike electric, pneumatic, and hydraulic valves. |
| Environment | Electric actuators are unsuitable for moist or explosive environments. Pneumatic actuators can be used in hazardous environments as they do not create sparks. |
| Frequency of use | Manual valves are suitable for small valves that open and close infrequently. Electric actuators operate for a shorter time and have a lower duty cycle than hydraulic actuators. |
| Cost | Manual valves are the least expensive, followed by electric, pneumatic, and hydraulic valves. |
| Valve size | Hydraulic actuators may be necessary for large butterfly valves to produce enough force to open or close the valve. |
| Maintenance | Electric actuators are relatively energy efficient and simple to maintain. Pneumatic actuators last longer than electric actuators but require ancillary equipment such as air compressors. |
| Speed | Pneumatic actuators are fast-acting, but their speed is more difficult to control than electric or hydraulic actuators. |
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What You'll Learn
- Cost: Manual is cheapest, followed by electric, pneumatic, and hydraulic
- Frequency of use: Manual valves are best for infrequent use
- Power source: Manual valves don't require an external power source
- Environment: Electric valves are unsuitable for moist or explosive environments
- Maintenance: Electric actuators are simple to maintain, pneumatic actuators last longer
Cost: Manual is cheapest, followed by electric, pneumatic, and hydraulic
When selecting an actuator for a butterfly valve, it's important to consider the specific system components and requirements. The four primary methods for actuating a butterfly valve are manual, electric, pneumatic, and hydraulic. The cheapest option is manual actuation, followed by electric, pneumatic, and hydraulic.
Manual actuation is the simplest and cheapest way to actuate a butterfly valve. It does not require an external power source, making it the most straightforward type to install and use. Manual actuation is ideal for low-pressure operations and small butterfly valves that open and close infrequently. However, it is not suitable for applications requiring frequent valve actuation or large valves.
Electric actuators are the most common type used and offer several advantages over pneumatic versions, including higher torque capacity, better accuracy, and greater energy efficiency. They are also ideal for remote locations as they require electricity rather than pressurised air or gas. Electric actuators are relatively energy-efficient and simple to maintain. However, they come with a higher cost and shorter service life compared to pneumatic actuators. They are also not suitable for high-moisture or explosive environments.
Pneumatic actuators are relatively cheaper than electric and hydraulic actuators. They create mechanical motion using air pressure and are commonly found in systems that require fast, regular motion. Pneumatic actuators have a very fast response time and are reliable, making them suitable for hazardous environments as they do not create sparks. However, they require a separate air supply infrastructure, and the actuation speed is more difficult to control compared to electric and hydraulic actuators.
Hydraulic actuators are the most expensive type of butterfly valve actuators. They are commonly used in applications that require very large operating forces, such as heavy-duty industrial processes. Hydraulic actuators can generate substantial forces, making them suitable for operating large valves or valves in high-pressure applications. They are known for their durability and robustness, which allows them to withstand harsh conditions. However, they increase the system's complexity and cost due to the required hydraulic power unit and fluid reservoir.
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Frequency of use: Manual valves are best for infrequent use
Manual butterfly valves are ideal for applications where adjustments are infrequent and performed by on-site personnel. They are the only type of butterfly valve that does not require an external power source, making them the most straightforward to install and use. Manual valves are operated by a hand-operated lever or wheel, which allows for simple control over the valve's position.
A quarter-turn of a lever will bring the valve from fully open to fully closed and vice versa. This makes manual valves well-suited for small butterfly valves that open and close infrequently. For larger sizes, the valves will be equipped with a gearbox to enable manual actuation, although this will increase the time it takes to open and close the valve.
The primary benefit of manual actuation is that it does not require an external power source. However, since a user needs to open or close the valve, this style is not ideal for applications requiring frequent actuation. Electric, pneumatic, or hydraulic actuators, on the other hand, enable precise and remote control, facilitating integration with advanced control systems for real-time adjustments and monitoring.
Manual butterfly valves are a straightforward and cost-effective solution for infrequent use. They are an essential device in fluid control systems, offering a simple design and operational efficiency.
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Power source: Manual valves don't require an external power source
Manual butterfly valves are the only type that does not require an external power source. This makes them the most straightforward type to install and use. Manual actuation is also the simplest way to actuate a butterfly valve. Manual butterfly valves are suitable for small butterfly valves that open and close infrequently. They are also inexpensive and easy to operate.
The most basic design uses a lever to turn the valve stem, which rotates the valve's disc to open or close the valve. Smaller butterfly valves are usually operated this way. Extended spindle valves can be operated remotely using a long stem. Small manual valves are typically fitted with a lever, while larger sizes are provided with a handwheel and a gearbox to generate enough force to open or close the valve.
Another way of manual actuation is in use cases where the valve is buried underground without a manhole. In such applications, actuation is done with an extension spindle. Gear-operated butterfly valves are another method of manual actuation, operated through a hand-operated wheel that controls the stem to allow and restrict flow through the disc.
Manual butterfly valves work without the use of power, but they operate at low speed and cannot be used for critical pipe systems. They are also not ideal for applications requiring frequent butterfly valve actuation.
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Environment: Electric valves are unsuitable for moist or explosive environments
Electric butterfly valve actuators are unsuitable for moist or explosive environments. This is because moisture can damage the electrical components of the valve and create a risk of short circuits or corrosion.
In explosive environments, there is a risk of internal sparks or explosion carriers coming into contact with the outside world. This can be mitigated by using a suitable explosion-proof surface gap and a sturdy shell that can withstand the high pressure generated by an internal explosion. However, it is often safer to opt for pneumatic actuators in such environments, as they do not create sparks and are therefore a better choice for hazardous locations.
Pneumatic actuators use pressurised air to move a piston or diaphragm, which rotates the valve stem. They are fast-acting and reliable, and their speed is more difficult to control than that of electric or hydraulic actuators. They do, however, require a compressed air source.
In moist environments, it is essential to protect the connections from water ingress, which can be achieved through solenoid connectors. The valve materials must also be able to withstand the minimum and maximum temperature requirements of the application, as temperature affects the viscosity and flow of the fluid.
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Maintenance: Electric actuators are simple to maintain, pneumatic actuators last longer
Electric actuators are simple to maintain. They use electrical energy to open or close valves through a gear mechanism that allows for a stem nut to be turned multiple times. Electric actuators can include a battery backup in an external enclosure to provide for fail-safe operation. In the event of a power failure, the battery backup unit supplies electricity to the actuator.
To maintain an electric actuator, you should conduct an external visual inspection of all external surfaces, including paint finishes, control knobs, and valve stems. You should also check and replenish the oil level, check mounting bolts, nuts, washers, and screws for damage and tightness, and confirm that the handwheel is operating correctly and that there is physical movement of the valve.
Pneumatic actuators, on the other hand, are known for their durability and longevity. They create mechanical motion using air pressure. The pressurized air in the actuator moves a piston or diaphragm, which rotates the valve stem. Pneumatic actuators can be used in hazardous environments because they do not create sparks. They are available in a wide range of sizes, styles, and configurations and can be used with a variety of mounts. They require minimal maintenance and can last longer than other types of actuators.
However, to make pneumatic actuators last longer, regular inspections and cleaning of external parts are necessary. Leaking seals, erratic movement, drift, or slower-than-normal operation are some signs that maintenance is required. Ensuring proper setup during installation can also extend the life of a pneumatic actuator. For example, with a cable cylinder, you must proof-load and pre-tension the cable.
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Frequently asked questions
The four primary methods for actuating a butterfly valve are manual, electric, pneumatic, and hydraulic.
Electric actuators are versatile, relatively energy efficient, and simple to maintain. They can be programmed to respond to specific signals and can be controlled remotely.
Electric actuators are not suitable for high-moisture or explosive environments. They also have a shorter duty cycle compared to hydraulic actuators, which means they operate for a shorter time before requiring a cool-down period.
In addition to the system requirements, you should evaluate the configuration of the system, including the valve body, stem, and bolt patterns. You should also consider the cost of purchasing and maintaining the actuator and any ancillary equipment.
Pneumatic actuators use air pressure to create mechanical motion, while electric actuators convert electrical energy into mechanical torque. Pneumatic actuators can be used in hazardous environments because they do not create sparks, but they require a compressed air source and can be more difficult to control.
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