Introduction
Electric valves, also called solenoid valves, are electromechanical devices that use electrical signals to actuate their function. When an electric valve is energized by an electrical signal, it opens, allowing fluid to flow through the system. When it is de-energized, the valve closes to interrupt the flow of fluid. These valves can be used in a variety of applications and are available in multiple shapes, sizes, and configurations that can be customized. This article provides a comprehensive overview of the standards associated with electric valves.
General Standards
Electric valves are required to meet a number of standards to ensure their quality, safety, and reliability. Several countries have different standards, but they generally include the following:
• ANSI/ISA 20.00/77.01-2011: This is the American National Standards Institute/International Society of Automation standard that defines the construction, replacement, testing, and documentation for valves.
• ISO 7389-4: This is an International Organization for Standardization standard that specifies the dimensions, ratios, and measurements of electric valves.
• BS EN 12 028-2: This is the British Standard for Electric Valve Design that defines requirements for performance, construction, mounting, controls, and materials.
• EN 60079-0: This is the European Standard for Electrical Equipment associated with Explosive Atmospheres that sets out the requirements for the design, construction, and testing of electric valves.
• UL-Listed Valve Standards: This is one of the U.S. Underwriters Laboratories standards for approval of Valves for Industrial Processes. It defines the requirements for the design, testing, construction, and operation of electric valves for industrial use.
Types of Electric Valves
Electric valves come in a variety of types that can be used for different applications. The most common types include:
• Solenoid Valves: These are the most common type of electric valve and are used in a variety of industries. They use an electromagnetic coil to actuate the valve when the power is turned on.
• Diaphragm Valves: These valves use a diaphragm to control the flow of fluid. This type of valve is often used in medical and pharmaceutical applications due to its ability to control flow without allowing contaminants to enter the system.
• Needle Valves: These valves have a needle-shaped valve seat and a threaded needle that is used to adjust the flow rate. They are most often used in applications such as fuel systems and hydraulic systems.
• Pilot-operated Valves: These valves use a pilot valve to open or close the valve. The pilot valve is opened and closed by electrical signals and is often used in large-scale systems due to their ability to control high volumes of fluid.
Electric Valve Materials
The materials used to construct electric valves are critical to ensure their proper function and durability. The most common materials used for electric valves usually include metal, plastic, and rubber.
• Metallic Materials: Metallic materials are often used for valves because they are strong and durable. Common metal materials for electric valves include brass, stainless steel, and bronze.
• Plastic Materials: Plastic materials are becoming increasingly popular for electric valves due to their light weight, flexibility, and corrosion resistance. Common plastic materials for electric valves are PTFE, PVC, and ABS.
• Rubber Materials: Rubber materials are often used for electric valves due to their ability to seal and protect the valve from debris and pressure. Common rubber materials for electric valves include neoprene, EPDM, and silicone.
Conclusion
Electric valves are essential components of many systems, and they must meet certain standards to ensure their performance, safety, and reliability. The general standards, types, and materials associated with electric valves are discussed in this article. By understanding these standards, engineers and procurement professionals can make informed buying decisions for electric valves for their specific applications.
