Electric actuator valves - Electric actuator valves manufacturer - SIO

Electric Actuator Valves

SIO manufactures highly-efficient electric actuators that are suitable for a variety of valves. Electric actuators will utilize a power source, like a battery, in order to operate. They will mount on valves which will move automatically as a response to a particular signal. They will shift to the desired position using a power source. These actuators are one of the most well-known valve actuators due to their quick response and accuracy.

There are two kinds of electric actuators. The rotary type is utilized with butterfly, ball, and plug valves. The linear type is perfect for globe, gate, angle, and diaphragm valves.

We at SIO will guarantee that you will receive the finest electric actuators that will power up your different valves.

    Actuated flange ball valve

    What Is an Electric Actuator Valve?

    An electric actuator valve is a type of industrial valve that has an electric actuator mounted to it. It operates through an electric signal and automatically moves to a desired position through an outside power source. An electric actuator valve is the most used automatic valve due to its many advantages:

    • Provides better positioning performance
    • Eliminates media leaks
    • Achieves better control flexibility
    • Maintains the reliability and robustness of existing systems

    As a top industrial valve manufacturer, SIO offers electric actuator valves of different designs and materials to ensure that the valves are fast-acting and reliable to promote smooth operations. They are built to provide quick open/close and throttle services and a safe environment for personnel. Various industrial valves can be electrically actuated and they are used in many complex applications, from food and beverage industries to wastewater treatment plants.

    General Specifications of an Electric Valve Actuator

    1. Control Sign Input

    An electric valve actuator that uses throttling valves receives control signal inputs to adjust the closure position of the valve. These control signals are measured in either volts (V) or milliamperes (mA).

    2. Automation Time

    Automation time is the required time for a linear motion valve to fully close. The amount of automation time depends on the type of valve, nature of process media, the electric current (AC or DC), and the amount of pressure.

    3. Failsafe Method

    A failsafe method allows the electric actuator to turn on or off when there is loss of control signal or power outage. The actuator either opens or closes, depending on the requirements of the system.

    4. Stem Diameter

    A valve stem diameter can be combined with the pitch and lead of a valve stem thread to size the automation needed for the valve. It can also be used with the pressure drop and valve size across the valve to measure torque demand.

    5. Duty Cycle

    A duty cycle refers to how long a valve can optimally work before it needs to rest. Electric motors generally produce a lot of heat, which requires rest from time to time. For example, if the valve is used for isolation, an intermittent rating of 20% duty cycle with 60 starts per hour is enough.

    6. AC or DC Voltage

    The requirements for AC or DC voltage will depend on the voltage capacity of the system. In most applications, the voltage supply is 120/240 VAC or 12/24 VAC.

    Electric Valve Actuator Design Features and Options

    A typical electric actuator valve is covered with an enclosure specified by the National Electrical Manufacturers Association (NEMA), an organization that determines safety standards for electrical equipment. These enclosures are available in four standards:

    Type 4
    This standard is designed for indoor and outdoor use and provides protection against contact with splashing water, hose-directed water, falling dirt, sleet rain, snow, and windblown dust.

    Type 4x
    An enclosure made from this standard is made either for indoor or outdoor use. For indoor use, it provides protection to employees against accidental contact with the equipment. For outdoor use, it provides protection against rain, falling dirt, sleet, windblown dust, snow, corrosion, splashing water, and hose-directed water.

    Type 7
    This is designed for indoor use in dangerous locations classified as Class I, Division I, Groups A, B, C, or D as specified by the National Fire Protection Agency (NFPA) 70.

    Type 9
    This standard is made for indoor use in dangerous locations classified as Class II, Division I, Groups E, F, or G as specified by NFPA 70.

    An electric actuator is equipped with a limit switch to monitor the status of the actuator from a remote location using reliable connections. In most cases, the signal or lack of it creates some action, such as issuing audible and visual alarms and switching control signals, in the process.

    An electric valve actuator can be equipped with an overtorque protection. When it exceeds the predetermined torque level, the electric valve actuator uses a sensor to turn off the motor.

    Push buttons and controls allow an electric actuator valve to be operated locally to start or stop the operation of a system. They also come with manual overrides for emergencies to shut the system immediately to prevent dangerous accidents.

    Thermal and thermostat overload protection adjusts the motor speed when the electric valve gets too hot from overuse. This is to prevent premature damage when the electric motor is performing more work than it is designed to handle.

    An electric actuator valve may be supplied with a lever or handwheel to manually overdrive it in case of an emergency. This is a safety feature to allow the valve to be manually actuated when there is a system or power failure.

    Types of Electric Valve Actuators

    Electric actuator valve diagram

    Source: Wikipedia

    1. Rotary Electric Valve Actuators

    A rotary electric valve actuator features a rotational mechanism that works via electromagnetic power from its motor. The rotational component is either a circular table that provides a bolt pattern to mount other components or a circular shaft that often includes keyways.

    Rotary electric actuator valves include ball valves, butterfly valves, and plug valves that make a quarter-turn (or more) rotation to open and close. They are typically used in high-power switching gears, packaging applications, and electric power industries.

    3 Types of Rotary Electric Valve Actuators

    An electric actuated ball valve means a ball valve is operated through an electric actuator. It rotates a 90-degree turn to completely open or close to provide full passage to media flow or completely obstruct it. It is used in various properties of media including water, air, gas, oil, steam, liquid, alkali, and acid.

    Since it provides positive sealing with zero leakage, an electrically operated ball valve is used in a variety of industrial applications. These include chemical and petrochemical, natural gas, petroleum, metallurgy, papermaking, shipbuilding, water treatment, and more.

    An electrically operated butterfly valve is a type of automatic valve that is operated remotely. It is mostly used for on/off applications but is also suitable for throttling services. It makes a quarter-turn rotation to allow or restrict the flow of gas or liquid.

    With its quick-acting mechanism and positive shut-off feature, an electric actuated butterfly valve is widely used in water applications, wastewater treatment plants, chemical and petrochemical industries, storage facilities, etc.

    An electric actuated plug valve is an automatic valve with a simple design and few parts, making it easy to maintain. It is ideal for on-off operations and can be used for multi-port applications. This means media flow can be rerouted in various directions while changing the flow direction can be done quickly.

    An electric actuated plug valve is well-suited for a range of media type, such as gas, air, sludge, slurries, clean and dirty water, and more. It is used in several industrial applications, such as water and wastewater services, pipeline systems, sewage applications, and hydrocarbon processing.

    2. Linear Electric Valve Actuators

    A linear electric valve actuator provides linear motion via an ACME screw or motor-driven ball screw assembly. An ACME screw usually holds loads with no power, while a ball screw is a power screw that has several ball bearings between the screw and the nut in a recirculating track.

    With a linear valve actuator, the load attaches to the end of a screw, which can be gear or belt driven, unsupported. The linear actuator includes electrical motor, electrical enclosure, travel limiting devices, reduction gearing, and valve stem drive nut/bushing.

    5 Types of Linear Electric Valve Actuators

    New large and grey valve with automatic electric drive for water supply systems

    An electric actuated gate valve is a type of gate valve that operates through an electric actuator. It is a linear motion valve with a flat disc that slides into the flow passage to provide a tight shut-off. It is an isolation valve that is turned clockwise to either open or close process flow.

    An electric actuated gate valve is well-fitted in applications that deal with slurries as the flat disc or “gate” can completely cut through dirty process media. It is also used in other types of flow, such as light grease, varnish, heavy oils, molasses, cream, honey, and other non-flammable liquids. It is often used in oil and gas industries, food and beverage industries, wastewater treatment facilities, and more.

    An electric actuated globe valve is an automated linear motion valve used to start, obstruct, and regulate process flow. The globe disc moves to the seat perpendicularly to open or close media passage. This mechanism provides an annular space between the disc and seat ring that slowly closes as the globe valve closes. This makes this valve type excellent for throttling services.

    An electric actuated globe valve provides accurate flow control and tight sealing and can handle any type of media where pressure drop is not a concern. It is well-suited for any industrial application that deals with lube oil, air, chemical, and feed water.

    New black and grey valve with automatic electric drive

    An electric actuated diaphragm valve is a versatile linear motion valve that uses an electric actuator to operate and is used for reliable on-off applications and throttling services. It is equipped with a flexible disc that comes into contact with the seat found at the top of the valve body to produce a tight seal.

    The disc or “diaphragm” is connected to a compressor that moves up and down by the valve stem. To stop or control flow, the compressor is lowered and the disc is pressed against the bottom.

    An electric actuated diaphragm valve is especially used to handle corrosive fluids, radioactive fluids, fibrous slurries, and other fluids that require reliable protection against contamination.

    An electric actuated needle valve is an automatic valve that features a slender and tapered point at the tip of the valve stem. It moves up and down to start, block, and control flow.

    An electric actuated needle valve is suitable for a range of applications that handle non-viscous liquids, such as air, steam, oil, and gas. These include oil and gas industries, water services, power generation, and natural energy processing plants.

    A solenoid valve is a type of automatic valve that has a built-in actuator. It operates using a linear sliding barrier that opens and closes the valve or diverts the flow from one channel to another. There are different types of barrier used, such as spool, diaphragm, plunger, and shuttle.

    A solenoid valve is used to release, obstruct, dose, distribute, and mix the flow of gas or fluid. It is commonly used in a range of industrial applications, such as general on/off control, process control systems, calibration and test stands, and original equipment manufacturer (OEM) operations.

    How Does an Electric Actuator Valve Work?

    An electric actuator converts energy into torque that moves or controls the mechanism of the valve it is connected to. It can both produce and prevent motion and runs on an electric source. The motor of the electric actuator operates through rotor and stator assemblies. The voltage is applied to the stator assembly that induces the flow of current to the rotor assembly. The interaction between these two assemblies creates a magnetic field that causes motion of the valve.

    Without voltage or power applied to the motor, the valve stays in the same position as it was when power was cut. Electric power is necessary at all times to control the valve.

    Applications for Electric Actuator Valves

    1. Water and Wastewater Treatment Industries

    Top view of Recirculation Solid contact Clarifier Sedimentation Tank

    Water and wastewater treatment facilities require proper control of different types of media flow. They handle applications that deal with clean and dirty water, sewage, slurries, and other dirty fluids.

    SIO electrically operated butterfly valve provides accurate and repeatable control on these types of media. It is made with durable materials, such as stainless steel and carbon steel, both of which have high tolerance to corrosion and abrasion even with continued contact with different fluids.

    2. Food and Beverage Industries

    Machines in food factory, confectionery industry

    The applications involved in food and beverage industries mainly require two types of valves. The first valve type is the one that comes in contact with food materials while the other is the one that handles utility services, such as water, steam, etc. Both of these types require quick-acting and reliable valves that ensure 100% sanitation.

    Our electrically operated ball valve has a quick response and is highly efficient making sure there is no leaking that could lead to contamination. Its valve seat can be made from sturdy materials, such as PTFE and RPTFE, both of which are highly tolerant to different pressures and temperatures as well as corrosion and abrasion.

    3. Power Plants

    Dusk landscape with big chimneys

    Power plants handle complex applications that involve extremely high pressure and temperature, extremely low pressure, and cryogenic temperature. They require a positive shut-off as any leak could lead to hazardous consequences.

    SIO electric actuated ball valve is made with a blow-out proof stem to protect the valve when it is receiving too much pressure. It is also made from robust materials, carbon steel and stainless steel, to withstand demanding conditions for a long time.

    4. Pulp and Paper Industries

    Closeup image of pleat cardboard row at factory background

    Pulp and paper industries handle industrial chemicals such as hydrogen peroxide, liquid chlorine, and chlorine dioxide. These chemicals are hazardous, abrasive, corrosive, and typically involve high pressures.

    Our electric actuated butterfly valve is built to withstand such conditions. The valve body is made from carbon steel or stainless steel, both of which are capable of handling critical and non-critical process media. The valve seat can be made from RTFE, a sturdy material that does not react to several chemicals involved in pulp and paper operations.

     

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