Valve actuators are vital in many industries. Their primary function is regulating flow. They ensure maximum productivity in systems. Engineers and technicians need to know valve actuators. Individuals sourcing these actuators must be knowledgeable. Various types of valve actuators exist. They differ in mode of operation and application. Choosing the right actuator valve is crucial. The article provides an overview of valve actuators. It categorizes them by their mode of operation. It also covers their applications. Learn how to select the best actuator valve. This guide helps meet your specific needs.
What Are the Different Types of Valve Actuators?
There are several types of valve actuators in use. These include manual, pneumatic, electric, and spring actuators. The application’s specific requirements determine the actuator type. Factors include required precision, speed, force, and control.
Spring Actuator
A valve actuator that employs a spring to actuate the valve is known as a spring actuator. The valve is either opened or closed by compressing or releasing the spring. The valve is in its default position when the spring is in its normal, uncompressed state. It is either completely open or fully closed when the actuator is inactive.
Electric Actuator Valve
Rotary motorized valve actuators are a subset of electric actuators for quarter-turn valves. Since electric rotary actuators convert electric energy into rotary force, a quarter-turn electric actuator is limited to a 90-degree rotation. The valve is rotated by the torque produced by the electric motor, which is transmitted to the valve through an output drive. DC (direct current) or AC (alternating current) are the voltage options for the motors, or they can operate on either.
Gearings, limit switches, wiring, and other actuator components are also contained within the compact, durable housing that houses the motor. A compatible connection interface, such as an ISO 5211 standard, is used to connect the entire assembly to a valve.
Manual Actuator
Manual actuators are actuated either by hand or through mechanical levers. It is easy and reliable to control the position of a valve or any other control device. There are many advantages of a manual actuator over other actuator types. Their installation, operation, and maintenance are easy, and there is no requirement for an external power source.
Pneumatic Actuator Valve
Automatic or semi-automatic valve operation is achieved using pneumatic valve actuators. They convert energy from compressed air into mechanical motion. The air is confined within a chamber. This allows it to expand. This results in a pressure differential. The differential is between the interior and exterior of the chamber. The pressure differential energizes the air. This allows it to be directed away from the chamber. It is then directed toward the mechanical component. This component is responsible for opening and closing the valve.
How Does an Actuator Valve Work?
Despite the simplicity of the working principle of an actuator valve, the design and construction can differ based on the actuation method and application requirements. The general procedures for the operation of an actuator valve are as follows:
Signal transmitted to actuator:
The actuator opens or closes the valve as per the signal from a control system.
Valve position changes:
The actuator motion changes the position of the valve stem, which causes a change in the valve disc/ball position.
Actuating energy source functioning:
The power source energy of the actuator is inputted, which can be pneumatic, electric motor, or hydraulic energy.
Flow adjustment:
The change in valve position changes or alters the fluid or gas passage through the pipe or system.
Transmission of feedback signal:
The actuator sends feedback to the control system to quantify the position of the valve and flow.
What Is Actuator Valve Do?
In spite of the method of actuation, all valve actuators are required to execute a number of fundamental functions, such as the following:
Relocate the closure element:
The closure element is a component such as a disk, disc, or plug. It partially or completely blocks fluid passage through the valve. The valve’s actuator must be capable of delivering the required force. This is necessary to move and position the closure element as required. This must hold true even under the most rigorous process conditions.
Retain the closure element’s position:
It is imperative that the actuator be capable of maintaining the closure element in the desired position in addition to physically moving it. Depending on its type, it may employ a spring, fluid power, or mechanical rigidity for this purpose.
Have a failure mode:
The actuator should have a suitable failure mode to prevent the system from sustaining excessive damage in the event of a power failure. For example, it could be set to completely closed or fully open.
Provide adequate rotational capabilities:
Actuators must be able to accommodate the rotational capacities of their valves, which are 90 or 180 degrees.
Seat the valve with sufficient torque:
During shutoff operations, the actuator must generate and sustain adequate torque to secure the valve in the closed position.
Execute operations at the appropriate speed:
Special control circuit elements modulate valve actuator cycle speed. Rapid cycle velocities decline below half the standard time. Choosing the valve carefully is crucial. This prevents shock-related damage to components.
How do you select the right actuator valve for your application?
The selection of the appropriate actuator from valve companies is contingent upon a variety of factors. These factors are the application requirements, valve type, actuation method, and budget. The following are a few methods to assist you in selecting the appropriate actuator valve:
Power source accessibility:
Is the actuator operational at your facility due to the presence of an adequate power source? If you elect to utilize a powered valve actuator, your facility must be outfitted with the appropriate power source. For instance, electric actuators require an electric motor, while pneumatic actuators require a compressed air supply.
Application conditions:
What are the conditions that the actuator will encounter in the application? Pneumatic actuators are suitable for application in temperatures between -4°F and 150°F. However, electric actuators can operate in temperatures between -40°F and 150°F.
Pneumatic actuators are preferable in hazardous environments due to their explosion-proof nature. However, electric actuators may be implemented, provided that they are housed in a NEMA-rated enclosure.
Emissions:
Are you trying to reduce your facility’s emissions? Heavy industry concerns strive to meet today’s stringent low-emission standards. They struggle because pneumatic actuators emit methane gas when in use. This gas contributes to atmospheric pollution. Electric actuators offer a zero-emissions alternative to pneumatic designs. They enable organizations to adhere to the growing number of severe environmental regulations.
Automation requirements:
Would you like to automate valve functions? Automation enables the monitoring and control of valves without the need for constant physical proximity. Powered actuators can accommodate automation, whereas manual actuators cannot.
Cost:
What is the most that you could possibly pay for your actuator? Manual and pneumatic actuators are priced lower. However, as far as upfront costs are concerned, electric actuators can provide significant long-term lifetime cost savings for the right applications compared to electric models. It has higher performance and lower emission characteristics.
Contact Plumberstar to Get a Certificated Actuator Valve
Plumberstar is a valve manufacturer in China that is both certified and prominent. Certified industrial actuator valves improve reliability, safety, compliance, cost savings, and reputation.
Actuator valves certified by Plumberstar are engineered to meet safety standards. It endures severe conditions, making them suitable for use in hazardous environments.
Quality inspection is done by a Plumberstar-certified officer. This happens in the actuator valve production phase. The officer ensures that high standards are upheld. The inspection is done in all stages of production. The valves are examined one by one. The defects are noted immediately.
Summary
An actuator valve is a device that regulates the passage of substances or gases within a system by opening or closing a valve. Industrial uses need it, including water treatment, oil and gas extraction, and manufacturing.
The actuator valve function and available type find the valve selection for an application. Plumberstar can provide you with the highest-quality industrial actuator valve.
