Product Description and Components

The document details a safety/relief valve model with various components including nozzle, body, bonnet, cap, disc, guide, spindle, spring, adjusting screw, lock nut, lever, packing, gaskets, bellows, and soft seat. Materials used range from carbon steel to stainless steel and duplex alloys, with specific grades such as A216 WCB, A217 WC6/WC9, A351 CF-8, AISI-316L, and AISI-420 among others.

Technical Specifications

• Connection Types: Flanged ANSI B16.5 with pressure ratings of 150, 300, 600, 900, 1500, and 2500 lbs.
• Material Range: Carbon steel, stainless steel, duplex stainless steel, and special alloys.
• Temperature Range: From -96°C to +400°C depending on material and application.
• Applications: Suitable for steam, gases, vapors, and liquids with specific set pressures starting from 0.2 barg and tolerances of ±3%.
• Seat Type: Metal-to-metal with Stellite coating for durability.
• Overpressure and Blowdown: Overpressure allowances vary by media type (10% for steam, 20% for fire exposure, 25% for liquids), blowdown typically 7%.
• Discharge Coefficients: K=0.975 for gases, K=0.64 for liquids.

Materials and Construction

The valve components are constructed from high-quality materials selected for pressure and temperature resistance. The document lists detailed material specifications for each part, including springs, packing, gaskets, and soft seats made from materials such as Viton, PTFE, graphite, and NBR.

Dimensions and Weight

The valve is available in sizes ranging from 1/2" to 20" inlet and outlet diameters. Detailed dimensional data includes orifice diameters (from 9.6 mm to over 300 mm), flow areas, and flange dimensions (A, B, C measurements). Weights vary significantly with size, from approximately 5 kg for small valves up to 1850 kg for the largest sizes.

Standards and Compliance

The valve design and manufacture comply with international standards including API RP 52, API STD 520/521, ASME Section VIII, MSS-SP-55, EN 4126-1, and ASTM specifications. These ensure safety, reliability, and suitability for industrial pressure relief applications.

Optional Features and Accessories

• Special springs for customized set pressures.
• Lift indicators and proximity switches for valve position monitoring.
• Heating jackets for temperature control.
• Nozzle rings and blowdown rings to optimize performance.
• Enclosures with ATEX certification for hazardous environments.

Recommendations and Limitations

The document emphasizes verifying all technical data and specifications before use. It disclaims responsibility for misuse or incorrect application. Materials and designs are subject to change without notice. Users should confirm compatibility with their specific media and operating conditions.

Summary

This technical document provides comprehensive data on a range of safety/relief valves designed for high-pressure industrial applications. It covers detailed component descriptions, materials, dimensions, performance parameters, compliance with standards, and optional accessories. The valves are suitable for a wide range of fluids and operating conditions, with robust construction and customizable features to meet diverse safety requirements.