Bailey 716VSD Safety Relief Valve (AFLAS Disc with Dome Top – Suitable for Gas Service)

The 746 Safety Relief Valve features a freely pivoting disc that ensures optimal alignment with the nozzle. Its design incorporates top guiding, an unobstructed seat bore, and full lift capability, guaranteeing the highest possible discharge rate for maximum protection of your plant.

The 'conventional' configuration is ideal for applications where the built-up pressure does not exceed 5%. Additionally, this conventional valve is suitable for systems with a consistent superimposed back pressure of up to 80%.

Specifications

• Sizes: 1" x 1.1/2" to 4" x 6"
• Connections: Flanged
• Head Type: Open Lever
• Materials: Carbon Steel body, Stainless Steel trim
• Disc: Stainless Steel
• Medium: Gases, Steam
• Set Pressure: 0.35 to 40 Barg (dependent on size)
• Temperature: -29 to +232 degC

Notes: This valve can also be supplied with a dome top and Viton disc. Please see the options below for more details.

The AURA EXT series is meticulously engineered for the control of gases and liquids under pressure in demanding environments, withstanding process temperatures of up to 500°F (260°C). Ideal for elevated-temperature applications, the EXT series delivers reliable performance without sacrificing precision or durability. At its heart, the EXT features AURA’s innovative encapsulated seat design, which consolidates multiple moving parts into a single assembly. This advancement reduces maintenance needs, minimises potential failure points, and enhances long-term reliability. The seat is safeguarded by a 10-micron, 360° filter, which significantly improves impurity removal compared to standard pressed-in disks. Unlike traditional regulators that only filter at the pipeline port, the EXT ensures protection against harmful particles from all inlet ports. AURA's proprietary machining process achieves ultra-smooth surface finishes ranging from 4–25 Ra, which helps to minimise corrosion and extend service life. With its minimal internal volume, the EXT requires less purge gas, thus enhancing efficiency in critical operations. Each EXT regulator is fully assembled with all fittings installed, helium leak tested at 100%, and subjected to rigorous flow and function testing to guarantee reliable performance in tough applications across the globe. For use in aggressive chemical environments, the EXT can be equipped with Dursan® LS inert coating technology, offering superior resistance to acidic and caustic substances—a solution often more effective than exotic alloys. By integrating heat-resistant engineering with advanced corrosion protection, the AURA EXT series presents a flexible, durable, and trustworthy solution for high-temperature pressure control applications.

Features & Benefits: Durable ductile iron body with integrated notch plate, anti-blowout stem for safe operation, fully bonded epoxy coating for Level 3 C3 corrosion protection, and maintenance-free design to reduce downtime.

Specification: Complies with BS EN 593; face-to-face to BS EN 558; DN250+ valves include fully enclosed gear operator; suitable for flow regulation and gas applications; Fig. 971/971G approved for Group 1 & 2 gases and liquids per PED 2014/68/EU.

Pressure/Temperature Rating: PN16, -10 to 90°C.