What are the flange types and standards compatible with Carilo Valve’s products?

Understanding Flange Compatibility with Carilo Valve Products

Carilo Valve’s product line is engineered for maximum compatibility with a wide array of international flange standards, primarily ANSI/ASME, DIN, and EN, ensuring seamless integration into global piping systems. The specific flange type and standard required depend heavily on the application’s pressure class, temperature, and media. For instance, their popular gate valves and ball valves are commonly manufactured with raised face (RF) or ring-type joint (RTJ) flanges in pressure classes ranging from 150 to 2500, conforming to ASME B16.5 for sizes up to 24 inches. For larger diameters, they adhere to ASME B16.47 Series A or B. In European and Middle Eastern markets, valves are often supplied with PN-rated flanges per EN 1092-1 (e.g., PN10, PN16, PN40) or DIN standards. The key to compatibility lies in matching the valve’s pressure-temperature rating (PTR), facing, and bolt hole pattern precisely to the connecting pipeline flange.

When you’re specifying a valve from Carilo Valve, the first and most critical step is to identify the governing piping specification. This document dictates the flange standard. In North America, the ANSI/ASME B16.5 standard is predominant. This standard covers flanges from NPS ½” to 24″ for pressure classes 150, 300, 400, 600, 900, 1500, and 2500. Carilo’s standard offerings in these regions are machined to these exact specifications. For example, a Class 300 valve will have a flange thickness, outside diameter, and bolt circle that perfectly matches a Class 300 pipeline flange. The facing, which is the finished surface that creates the seal, is typically a Raised Face (RF) for classes 150 to 600. The RF has a specified surface roughness (125 to 250 microinches AARH) to ensure a proper gasket bite. For higher-pressure applications (Class 900 and above), a Ring-Type Joint (RTJ) facing is often used, which employs a metal ring gasket seated in a groove for a robust, metal-to-metal seal.

For larger diameter pipes, typically over 24 inches, the applicable standard shifts to ANSI/ASME B16.47, which is split into two series: Series A (formerly MSS SP-44) and Series B (formerly API 605). Series A flanges are generally heavier and have a higher load-bearing capacity than Series B. Carilo can manufacture valves to either series, but this must be explicitly specified during the ordering process to avoid a costly mismatch on-site. The difference isn’t trivial; a Series A flange for a 36-inch Class 150 valve has a bolt circle diameter of 39.75 inches, while a Series B flange for the same size and class has a bolt circle of 38.25 inches—making them completely incompatible.

Outside of the Americas, the EN 1092-1 standard (which supersedes older national standards like DIN 2527) is widely used. This system uses Pressure Nominal (PN) ratings, such as PN16, which indicates a pressure rating of 16 bar at 120°C. Carilo valves destined for European projects are commonly supplied with PN flanges. A crucial distinction here is the prevalence of the Flat Face (FF) flange, especially in PN10 and PN16 classes, often used with cast iron or ductile iron valves in low-pressure water applications. It’s vital to specify the facing type, as mating a flat face flange to a raised face flange without proper adaptation can lead to gasket failure. For higher PN ratings (PN40 and above), a raised face is standard.

The material of the valve body itself directly influences the compatible flange standards and their pressure-temperature ratings. A carbon steel valve (e.g., ASTM A216 WCB) with an ASME Class 150 flange is rated for a certain pressure at a specific temperature. However, an austenitic stainless-steel valve (e.g., ASTM A351 CF8M) with the same nominal Class 150 flange will have a different pressure-temperature rating due to the material’s different strength properties at elevated temperatures. Carilo provides detailed PTR tables for each valve material and flange combination, which are essential for engineers to ensure the valve is suitable for the service conditions. You cannot simply select a valve based on “Class 150”; you must cross-reference the class with the material and the maximum operating temperature.

Beyond the major standards, special applications demand specific flange types. In high-vibration or high-thermal cycling services, tongue and groove (T&G) or male and female (M&F) flanges are specified. These flanges are self-aligning and contain the gasket within a groove, preventing blowout. Carilo can machine these specialized facings upon request. For wafer-style butterfly valves, the flange compatibility is different. These valves are sandwiched between two pipeline flanges and use through-bolts. The valve itself doesn’t have a flange face but must be compatible with the bolt spacing and gasket type of the mating flanges, typically adhering to standards like AWWA C504 for waterworks or API 609 for industrial use.

Ultimately, ensuring flange compatibility is a non-negotiable part of the procurement process. It requires a detailed review of the piping and instrumentation diagrams (P&IDs), line lists, and piping specifications. Simply assuming a “standard” flange can lead to project delays, safety hazards, and increased costs for adaptors or rework. The data sheet for every Carilo valve explicitly states the flange standard, class, facing, and material it is manufactured to, providing a clear and unambiguous reference for integration into your specific system. This meticulous attention to dimensional standards is what allows their products to function reliably in critical applications across the oil and gas, power generation, and water treatment industries.