Safety Relief Valves - Series 740

Overview

ASME SECTION VIII, Suitable for Air, Gas, Steam, or Liquid Service

The Series 740 safety and relief valve is built for precision and dependability, making it ideal for heavy-duty industrial applications. Designed for multi-purpose pressure relief, it supports liquid, steam, and air/gas services with exceptional performance. Fully certified to meet ASME Section VIII standards, along with National Board, CE, and CRN approvals. Handles pressures up to 1500 PSI and offers a wide range of metal seating options for various applications.

Features:

✔ Full nozzle, top-guided design for stability and durability
✔ Short, precise blow-down for efficient operation
✔ Wide range of inlet/outlet sizes to fit various applications
✔ Dual-lapped precision seating for a tight, reliable seal
✔ 100% back pressure tight for maximum performance
✔ Drain hole with threaded plug for added functionality
✔ Cryogenic compatible for extreme temperature conditions

Available Options:

➤ Tri-Clamp x Tri-Clamp Connection for sanitary applications
➤ O-ring seating options for enhanced sealing (see charts)
➤ Packed lift lever or closed cap configurations
➤ BSPT and BSPP piping compatibility
➤ Tri-Clamp inlets for easy installation
➤ Full range of metal options for different environments
➤ API 527 seating for industry-standard performance
➤ Lap joint flanges for flexible mounting
➤ Lead-free options (D, E, and F orifice only)
➤ Oxygen cleaning for specialized applications

Series Overview:

Series 740

• Construction: Brass nozzle, stainless steel ring, disc, and springs; brass/bronze body and bonnet
• Pressure Rating: 350 psig (24.1 barg) for air/gas and liquid, 250 psig (17.2 barg) for steam
• Temperature Range: -320°F (-196°C) to 406°F (208°C)

Series 741

• Construction: Stainless steel nozzle, ring, disc, and springs; brass/bronze body and bonnet
• Pressure Rating: 1500 psig (103.4 barg) for air/gas and liquid, 300 psig (20.7 barg) for steam
• Temperature Range: -320°F (-196°C) to 425°F (218°C)

Series 742

• Construction: Stainless steel nozzle, ring, disc, all internals, and springs; carbon steel body and bonnet
• Pressure Rating: 1500 psig (103.4 barg) for air/gas and liquid, 300 psig (20.7 barg) for steam
• Temperature Range: -20°F (-29°C) to 800°F (427°C)

Series 743

• Construction: Stainless steel nozzle, ring, disc, all internals, and springs; stainless steel body and bonnet
• Pressure Rating: 1500 psig (103.4 barg) for air/gas and liquid, 300 psig (20.7 barg) for steam
• Temperature Range: -320°F (-196°C) to 800°F (427°C)

Series 744–748

• Materials: Specialty metals tailored for specific applications
• Specifications: Contact Aquatrol for detailed dimensions and cut sheets

Applications:

Ideal for pressure vessels, pumps, hydraulics, tanks, steam systems, chemical processing, cryogenic applications, air/gas compressors, separators, bypass systems, and overpressure protection. Designed for a wide range of industrial applications requiring dependable safety relief solutions.