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Safety Relief Valves – Series 740

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

Categories: Aquatrol, Instrumentation, Pneumatic & Instrumentation, Valves and Fittings

Description

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.