Bailey 716ESL Safety Relief Valve (EDPM Disc with Lifting Lever – Suitable for Water & Gas Service (not Air))

The PREL100023 High Capacity Sealed Heating System Pressure Relief Valve discharges water off the system at a set pressure in the event of system over pressurisation (high for larger capacity systems) Reliance Valves 100 Series Pressure Relief Valves are made from hot pressed brass and are predominantly used to protect closed-circuit wet heating systems from overpressure. The outlet is one size larger than the inlet to ensure high discharge flow rates. It has a separate seal seating from the diaphragm to give improved scaling resistance and a cover which is made from OT58 brass. Available in a variety of sizes to suit most installations, it also has a pressure range from 2.5 - 5.0 bar, with the response pressure indicated on the twist cap. The valve size is determined by the heat output of the boiler as shown in the maximum heating capacity table. 

Features and benefits: 

- High flow design for larger capacity systems 

- Outlet is one size larger than the inlet for high capacity discharge 

- Provides protection against over pressurisation in wet heating systems 

- Diaphragm design gives improved resistance against scale 

- Cartridge design gives ease of service and replacement without the need to reset the response pressure 

- Set pressure range from 2.5 - 5.0 bar to suit any system requirement 

- High lift design for increased discharge capacity 

- Suitable for heating applications only 

Specification

Size: 1" x 1.1/4"Connections: BSP Female Inlet x BSP Female OutletMaterials: Hot pressed DZR BrassMedium: WaterSet Pressure: 3 BargTemperature: +140 degCProduct Code: PREL100023Notes: WRAS approved

The FSY90N Nano Scored Rupture Disc is a reverse-acting, micro-scored compression disc designed for high reliability and precision pressure relief. Its convex shape remains stable under operating pressure and only inverts at the set reverse pressure. Capable of operating at up to 95% of its burst pressure, the disc withstands thousands of pressure cycles without loss of performance. When activation occurs, it opens fully within milliseconds along the scored pattern, producing no fragments.

FSY90N discs are less affected by temperature fluctuations than conventional rupture discs, making them ideal for processes with wide temperature variations. They are suitable for gas and liquid applications (with a gas cushion where required) and are commonly used to protect pressure relief valves. A broad selection of materials and thicknesses provides excellent corrosion resistance, with optional PTFE lining available for enhanced chemical protection. Vacuum support is not required.

Key Specifications:

• Sizes: 1" (DN25) to 8" (DN200)

• Materials: Stainless steel, Alloy 201, 400, 600, C276, Titanium

• Burst Pressure Range: 0.2–70 bar g (depending on size and material)

• Tolerance: ±5% to ±20%

• Operating Margin: 90% standard, up to 95% in suitable conditions

• Temperature Range: -196°C to 600°C

• Fragmentation: None – clean, full opening

• Use Under Valve: Yes

• Corrosion Resistance: Very good

• Linings: Optional

• Holders: FSHR/A, FSHR/P, FSHR/F, FSHTC

• Rupture Detection: Electrical, magnetic, inductive, optical

• Certifications: ASME (UD Stamp), PED (CE), ATEX EX II 2 GD

The PREL102027 Reliance Water Controls (RWC) 102 Series potable water pressure relief valve is essential for discharging water from the system at a predetermined pressure, safeguarding against cold water over-pressurisation in unvented cylinders. Designed to protect unvented systems from excessive pressure, the Reliance Valves 102 Series Potable Water Pressure Relief Valves feature a pre-set and locked mechanism that activates when the system pressure exceeds the defined limit. At this point, the valve lifts off its seat, allowing water to be released safely to waste. Serving as the primary safety device in any unvented system, these pressure relief valves are crafted with a robust single-piece cartridge and are available in various pressure settings ranging from 3.5 to 8 bar, along with multiple connection sizes for versatile installation.

Features and Benefits:

• Quick and easy removal of the single-piece cartridge for cleaning or replacement
• Innovative diaphragm design for enhanced resistance against scale build-up
• Effective protection against over-pressurisation
• Multiple connection options for flexible installation
• Adjustable relief pressure range from 3.5 to 8 bar
• Designed exclusively for cold water applications

Specifications:

• Size: 3/4" x 22mm
• Connections: BSP Male Inlet x Compression Outlet
• Materials: Hot-pressed DZR Brass
• Medium: Cold water
• Set Pressure: 6 Barg
• Temperature: +140°C

Ensure the safety and efficiency of your unvented system with the PREL102027 Reliance Water Controls 102 Series potable water pressure relief valve – a reliable solution for managing cold water pressure. Shop now to secure optimal performance and peace of mind!