Automatic Valves for manufacturing - SIO

Automatic Valves

SIO can provide you with automatic valves that come with different materials and functions. Automatic valves are useful in a wide range of applications. Their mechanism is a spring-loaded cartridge. The cartridge will absorb the pressure that is typically caused by alterations in the flow. These conditions are regulated by the control valve.

These control valves are commonly used in air handling equipment, towers, chillers, baseboards, pumps, cabinets, and terminals among others. The type of automatic valve will depend on where it is used. For example, small automatic valves are effective in cabinets, terminals, and baseboards. Meanwhile, large automatic valves are ideal for towers, chillers, and pumps.

You can be confident that SIO will help you with all your needs and configurations for automatic valves.

    What Is an Automatic Valve?

    Using an automatic valve significantly improves flow control, precision, and efficiency. An automatic or automated valve is a valve controlled by a valve actuator to open, close, and regulate media flow. An actuator mounts on the valve and in response to a signal, moves the valve to open or close using an outside power source.

    Valve Automation Methods

    There are two types of valve automation methods that differ from the medium they use to transmit power.

    An electric valve actuator is an excellent solution for valve automation as it is non-toxic, quiet, and cost-effective. It provides accurate positioning control with less noise during operation.

    An electric valve actuator uses a single-phase or three-phase AC (alternating current) or DC (direct current) motor to control several gears to create the desired torque level. It is mostly used for manufacturing automation applications but also suitable for other industrial applications, such as in food and beverage and chemical industries.

    Two Types of Electric Valve Actuators

    An electric linear actuator is an electrically-powered mechanical linear actuator that consists of drive mechanisms, motors, and linear guides. These components are used to transform electrical energy into linear motion via mechanical transmission, thermal expansion, or electromagnetism to generate a straight push/pull motion.

    Industrial valves that can use an electric linear actuator include gate valves, globe valves, solenoid valves, diaphragm valves, and needle valves.

    An electric rotary actuator is an electrically-powered mechanical device that is made up of motors and shaft mechanisms with controlled rotary motion. These are used to change electrical energy into rotational motion to change the position of the valve.

    An electric rotary actuator is mainly used in operations with ball valves, butterfly valves, and plug valves.

    A pneumatic valve actuator is capable of achieving a high closing force compared to other actuators. Since it uses compressed air as the main power source to control the valve, it is safe and suitable for applications that handle flammable environments. It is also capable of handling high pressures such as in ventilation systems, internal combustion engines, industrial pumps, and more.

    Two Primary Forms of Pneumatic Valve Actuators

    A diaphragm actuator has a thin and flexible membrane called a “diaphragm” that actuates a valve using compressed air. It is a single-acting type of actuator as air is only supplied to one side of the diaphragm. It can either be direct-acting (spring-to-react) or reverse-acting (spring-to-extend).

    Working principle of direct-acting and reverse-acting

    A direct-acting diaphragm actuator is designed with a spring below the diaphragm, having air filled to the area above the diaphragm. This allows the actuator stem to extend with an increase in diaphragm pressure.

    A reverse-acting diaphragm actuator is designed with a stem that retracts with an increase in diaphragm pressure.

    Source: Spirax Sarco

    A piston actuator is often used in applications where the stroke of a diaphragm actuator is too short or the thrust is not enough. It uses compressed air that is enforced to a solid piston enclosed in a solid cylinder. A simple design has air filled into a central chamber forcing the piston upwards. When air pressure is relieved, the shaft moves in the other direction due to the reverse-force spring.

    A piston actuator can be single-acting or double-acting as the air can be filled into either side of the piston due to the absence of a return-spring.

    What Valves Can be Automated?

    Actuated flange ball valve

    1. Ball Valve

    An automated ball valve is a quarter-turn valve that operates through an external power source, either electricity or compressed air. It features a spherical disc, better known as the “ball,” that rotates 90 degrees to open or close media passage.

    An automatic ball valve is fast-acting and ensures tight sealing making it suitable for almost any application that requires a positive shut-off. These include liquefied natural gas (LNG) processing plants, power generation plants, water and wastewater treatment facilities, and more.

    SIO offers different types of ball valves to meet different working conditions. These include extremely high pressure and temperature, extremely low pressure, cryogenic temperature, and applications that deal with hazardous, corrosive, and abrasive media.

    2. Butterfly Valve

    An automatic butterfly valve is a quarter-turn rotary motion valve that functions through the use of an actuator. The actuator can be electric or pneumatic, depending on the power source. The disc of the valve, known as the butterfly, is the closing mechanism of the valve. It is connected to a rod and turning it a full 90 degrees either opens or obstructs media flow.

    An automated butterfly valve is compact and lightweight, making it suitable where workspace is limited. It provides a tight shut-off and can handle different types of media, such as chemicals, natural gas, water, and slurries.

    We manufacture different models of butterfly valves, such as resilient seated butterfly valves and high-performance butterfly valves. All of these valves are equipped with valve seats made from durable materials including BUNA-N and EPDM. This is to ensure that our butterfly valves can withstand demanding applications such as those handling chemicals and corrosive media.

    Actuated high-performance butterfly valve

    3. Plug Valve

    An automated plug valve is a simple type of quarter-turn valve that consists of only three main body parts: cover, plug, and body. The plug can be cone-shaped, cylindrical, or tapered that goes up or down to control or completely obstruct process flow. Usually, the body does not have a bonnet.

    An automatic plug valve is extremely flexible and is commonly used in low-pressure industrial and sanitary applications. These include chemical processing and related applications, petroleum pipelines, and power plants. It is also used in extreme temperature applications, such as condensate, boiler feed, and other similar media.

    Actuated flange ball valve

    4. Globe Valve

    A type of linear motion valve, an automatic globe valve has a globular body and is mainly used to start, stop, and regulate media flow. Its design provides the right angle contact between the disc and seat ring, ensuring positive sealing. It is used for isolation and throttling in applications where pressure drop is not a controlling factor.

    An automated globe valve is fast-acting, provides accurate control, and is suitable for high-pressure systems. It is used in a range of industrial applications, such as gas and liquid systems, steam applications, and power generation plants.

    SIO manufactures various types of globe valves according to BS and ASME standards to ensure they provide optimal performance. They are made from robust materials, such as forged steel, cast steel, and carbon steel, all of which feature enhanced strength to withstand severe applications, such as extreme pressure and temperature as well as corrosive media.

    5. Gate Valve

    An automated gate valve is a linear motion valve with a flat disc, known as the gate, that rises and lowers to open and shut the path of media. It has a handle wheel that when turned in a clockwise direction, the gate goes down to close the process line. When completely closed, the gate will seal tightly between the two seats of the valve eliminating the chances of leakage.

    Because of its gate, an automatic gate valve is well-suited for slurries as the gate will completely cut through the path. It is also widely used in applications that handle viscous fluids, such as varnish, light grease, heavy oils, cream, and other noncombustible liquids.

    We offer gate valves that are API and ASME certified to ensure safety and stability. They are either made from forged steel or cast steel, both of which possess enhanced strength to ensure optimal performance and long service lives.

    Gate valve with electric actuator
    Diaphragm valve with pneumatic actuator

    6. Diaphragm Valve

    Actuated diaphragm valve features a flexible disc, known as the diaphragm, that comes into contact with the seat to form a tight seal. The diaphragm responses to pressure that transfers force to open, close, or regulate a valve. This mechanism ensures a positive shut-off preventing the chances of contamination.

    Since it prevents contamination, an automatic diaphragm valve is ideal for food processing, water treatment, and pharmaceutical industries. It is also commonly used in pulp and paper industries, electronics, and power industries.

    7. Needle Valve

    An actuated needle valve has a tapered point at the end of the valve that goes down through the seat to block flow. It is equipped with a fine-threaded stem and a large seat area that allows precise resistance to flow. The mechanism of this valve is smooth and gradual to control the flow rate accurately.

    An automated needle valve can handle various media types, including water, gas, oil, and non-viscous liquids. It is widely used in gas and liquid dispensation, cooling systems, power generation plants, and instrumentation control.

    8. Solenoid Valve

    A solenoid valve is an electrically-operated valve that has a built-in actuator. This actuator changes the position of a valve through electromagnetic solenoid coils. It is suitable for various functions, such as on/off switching, dose, release, and mixing or distribution of fluids. With its compact design, a solenoid valve ensures reliability, low control power, and fast and safe directional flow switching.

    A solenoid valve is well-suited to control the direction or flow of liquid or air in fluid power systems. It is also used in an array of industrial applications including process control systems, pilot plant control loops, general on/off control, and several OEM (original equipment manufacturer) applications.

    As a reliable industrial valves manufacturer, SIO offers solenoid valves that are made from different materials and specifications. They are customizable to meet the specific needs of clients. Our solenoid valves are excellent for managing clean process media and on/off controls, especially when there is no compressed air available.

    Pilot-operated solenoid valve

    What Are the Applications?

    1. Oil and Gas Industries

    Oil and Gas

    Applications in oil and gas industries often deal with severe working conditions. Many of the process media are flammable and must be controlled with high precision. Automatic ball valves ensure a bubble-tight shutoff eliminating any chance of leaking. Since they can be remotely controlled, actuated ball valves significantly reduces accidents and mishandling of system components. All of these promote safety and efficiency in the workplace.

    SIO manufactures different ball valves, such as trunnion mounted ball valves and floating ball valves, both of which are suitable for oil and gas applications. They are equipped with a fire-safe design to protect the process media and the workplace in case accidental leakage happens and even when there is fire. They are also made with a blow-out proof stem and antistatic device to ensure our ball valves are safe and reliable even when handling extreme conditions.

    2. Wastewater Treatment Facilities

    Aerial top view recirculation solid contact clarifier sedimentation tank

    Wastewater treatment facilities require valves that have quick response and reliable sealing. They often deal with dirty fluids, such as sewage and slurries. An automatic gate valve is ideal for such media due to the shape of its disc. It also provides proper precision control on the inlet of wastewater to the filters, enhancing the primary treatment process.

    We offer gate valves that are durable enough to handle pressure ratings #150 to #2500. They can be made either from forged steel, cast steel, Alloy 20, Monel, Inconel, Hastelloy. They are designed and built to withstand the complex and fluctuating conditions of wastewater treatment applications.

    3. Chemical and Petrochemical Industries

    Close up of Gas storage sphere tanks in petrochemical industry at twilight

    Chemical and petrochemical industries require that there is absolutely no leakage during operations. They also require valves to accurately control the media flow even when there is high pressure. An actuated globe valve is excellent for handling such applications as it ensures precise control of fluid flow. It is also designed to handle high-pressure conditions, which are common in these industries.

    SIO offers globe valves that are made from sturdy materials, such as stainless steel, cast steel, forged steel, and more. These materials have high tolerance properties to chemicals and corrosive and abrasive media. These allow our globe valves to be non-reactive to the different properties of fluids involved in chemical and petrochemical applications.

    4. Food and Beverage Industries


    One of the main priorities of food and beverage industries is sanitation and integrity of their products. The valves used in these industries must provide a really tight shut-off and must accurately handle viscous fluids. An automatic gate valve is ideal for such applications as it is designed to handle heavy fluids, such as oil, grease, cream, varnish, etc.

    We at SIO manufacture forged steel gate valves that are API 602 and ASME B16.4 certified to ensure safety and reliability. The forged steel material protects our gate valves from corrosion and abrasion and allows them to withstand different types of media even with continued use.

    5. Pulp and Paper Industries

    Pulp and Paper Industries

    Pulp and paper industries often deal with chemicals and other hazardous substances, such as hydrogen peroxide and liquid chlorine. These substances require proper control and positive sealing as leakage can be hazardous. An automated double offset butterfly valve is excellent to handle such process media.

    We build double offset butterfly valves that can be actuated for more accurate control of media flow. They are equipped with bi-directional interference to ensure a positive shut-off and smooth operations. They are also made from durable seat materials, EPDM and RTFE, to handle the complex properties of process media. Our butterfly valves prevent any chance of leaking which is the priority in pulp and paper applications.

    What Are the Common Types of Automatic Valves?

    1. Automatic Drain Valve

    An automatic drain valve, also known as an automatic bleed valve, removes media from process lines and storage or process tanks. It is commonly used in compressed air systems and steam process lines where slurries, gas, or liquid needs to be drained from the system. It is also used to remove condensate either on a timed schedule or automated based on the level of condensation.

    2. Automatic Vent Valve

    An automatic vent valve, also known as an air release valve (ARV), is used to automatically release air trapped in a heating system. It is equipped with an internal lever mechanism that increases the float force so it can be greater than the internal pressure. This allows the vent valve to open against internal pressure. An automatic vent valve is important for protection against water hammer and to promote pipeline efficiency.

    3. Automatic Flow Control Valve

    An automatic flow control valve is used to regulate the flow pressure and rate of fluids through a pipeline system. It is useful in maintaining a predetermined flow rate and limiting the maximum flow rate regardless of the changing pressures in upstream and downstream lines. It functions by responding to signals made by external devices, such as temperature gauges and flow meters.

    4. Automatic Relief Valve

    An automatic relief valve is a type of safety valve used to limit the pressure in a system to prevent instrument or equipment failure and accidental fire due to pressure buildup. It is designed to open at a pre-set pressure level to protect pressure containers and other system components from receiving pressure exceeding their limits. When there is too much pressure, an automatic relief valve redirects media to an auxiliary passage that goes out of the system.


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