Valves are one of the most important devices used in a myriad of industries, from chemical and food processing plants to plumbing systems and engineering operations. Valve identification is essential to ensure the correct functioning of the entire system these components are embedded in. Every valve in a given process should be correctly identified and labeled to support performance, safety and compliance with industry standards and regulations.
Valve identification should be both accurate and visible. Labels are commonly used as the identification method of choice, as they last long and can accommodate long strings of text, symbols and technical data. As part of a process control system they serve a valuable purpose, providing information essential to the proper functioning and troubleshooting of the whole system.
A valve-labeling system is often complex, as multiple variables and hierarchies are necessary to properly identify the components. Relevant data should include the type of the valve, manufacturer, model, size, unique serial number, working pressure and other stipulations of the components, as well as the location of the valve. The labeling system should meet industry standards, such as ANSI/ISA-5.1 and ISO/EN 1701.
Two classes of valve identification tags have evolved over the years. Tags typically used for plumping applications are characterized by a one-piece design which includes a foldover flap for complete waterproofing and protection of the components. For hazardous and corrosive environments, explosion-proof tags are used to suppress sparks or open flames caused by electrical arcing, static electricity or a sudden burst of pressure.
Valve tags typically come in many materials, colors and sizes, but the most common are brass, stainless steel, aluminum and plastic. Engraving is the standard method of choice for marking valve tags, but embossing, stamping and etching are used as well. When choosing the size of the tags, it is important to remember that in many cases operators should be able to read the information without having to maneuver into uncomfortable positions.
Valve-labeling systems should comply with industry standards, such as ASME A13.1 for size, color and legend requirements. The following color patterns are the most commonly used for valves and the corresponding functions the color indicates:
• White – Straight through
• Green – Nozzle
• Red – Gauge cocks
• Yellow – Bypass
• Orange – Vent
• Blue – Injector
• Gray – Strainers
Hardware and software solutions for valve-labeling systems are also available. These solutions allow operators to easily and quickly find, identify, monitor and control valves and other components within their facility. Some manufacturers offer stainless steel and aluminum plates with a zinc coating to provide an extra layer of protection against corrosion. These plates can be used both outdoors and indoors and come in standard or customized sizes to fit the customer’s exact needs.
Valve identification is critical in a myriad of industries. Valves should be correctly identified and labeled using tags, labels, hardware and software solutions, which comply with standards and regulations. Operators should be able to easily read the relevant data without having to maneuver into uncomfortable positions. Through the use of a valve-labeling system, operators can monitor and control valves and components more efficiently, effectively and safely.
