Reliance Temperature and Pressure Relief Valve, 15mm, 15 mm Compression 7bar

The Reliance PTEM550759 is a precision-engineered relief valve designed to protect unvented hot‑water cylinders and plumbing systems from over‑pressure and excessive temperature. With a set pressure of 7 bar and a maximum working temperature of +95 °C, it provides reliable safety in domestic or light commercial applications. The 15 mm male compression connection ensures easy integration into standard copper pipework, making it suitable for engineers and system designers focused on durability, compliance and long‑term performance.

Core Features and Benefits of the Reliance Temperature and Pressure Relief Valve

• Pre-set relief at 7 bar to safeguard against unsafe pressure build-up.
• Maximum allowable temperature of +95 °C protects against overheating of cylinders or water storage systems.
• 15 mm male compression connection offers quick, secure installation in copper piping systems.
• Compact design tailored for hot‑water use and domestic boiler interfaces, where space and accessibility matter.
• Manufactured by Reliance Water Controls – trusted supplier with strong distribution and support for heating/plumbing components.
• Simplified servicing and part‑replacement options reduce maintenance downtime and system risk.

Engineered Protection for Hot‑Water Systems

Explicitly designed for hot‑water cylinder safety, the PTEM550759 uses a combined temperature and pressure relief mechanism. In the event of temperature rise beyond +95 °C, a sealed probe with a thermal element expands, lifting the valve off‑seat to discharge water and reduce both temperature and pressure in the vessel. Simultaneously, the pressure‑relief mechanism responds if system pressure climbs beyond the 7-bar threshold. This dual‑mode protection ensures that failures in either thermostat or pressure controls do not compromise system integrity.

Application Potential of the Product

• Install on top of unvented domestic or light‑commercial hot‑water cylinders to protect against excess pressure and overheating.
• Use in closed‑loop domestic hot‑water supply systems where temperature regulation is critical (e.g., boiler‑feed, buffer tanks).
• Suitable for use with copper pipework and 15 mm compression line connections.
• Apply where local regulations or standards require certified temperature‑and‐pressure (T&P) relief for safety compliance.
• Ideal for maintenance‑friendly installations.
• Use in heating applications with maximum water temperature.

For more information please check the datasheets.