Reliance RWC TPR15 Pressure & Temperature Relief Valve 1/2" x 15mm 4.5 Bar - PTEM550856

### Product Specification **Size Options:** - 3/4" x 1.1/2" - 1" x 1.1/2" - 1.1/4" x 1.1/2" - 1.1/2" x 1.1/2" **Connections:** - Screwed BSPP or NPT **Materials:** - **Nozzle:** Stainless Steel - **Spring Bonnet:** S.G. Iron - **Disk:** Available in Metal, Viton, or Nylon (material selection depends on pressure requirements) - **Joints & Seals:** NBR, FPM, EPDM (varies by model) **Head Type:** - Type C (Gas tight cap) **Medium Compatibility:** - Suitable for Steam, Gases, and Liquids **Set Pressure Range:** - 0.05 to 130 Barg (varies by size) **Temperature Range:** - From -10 to 280 degrees Celsius **Design Certification:** - TUV Approved **Additional Information:** - We offer an array of variants (please refer to downloads) with options for different (a) O-ring and disc materials, (b) NPT connections, (c) orifice sizes, and (d) head types. For further details or specific requirements, please do not hesitate to contact us. Ensure you choose the right size and material to meet your operational specifications and enjoy reliable performance across various mediums.

**Altecnic / Caleffi 309 Pressure & Temperature Relief Valve (309500CST)** The Altecnic / Caleffi 309 Pressure & Temperature Relief Valve (model 309500CST) is expertly designed to monitor and regulate the temperature and pressure within domestic storage heaters. This valve plays a crucial role in preventing the water temperature from exceeding 100°C and averting the dangerous formation of steam. Once the specified limits are reached, the valve automatically discharges an adequate quantity of water, ensuring that both temperature and pressure are safely maintained within the system's operational parameters. **Operational Mechanism:** 1. **Temperature Regulation:** The valve's thermostat compound, housed within the temperature sensor submerged in the hot water storage heater, expands with a rise in temperature. This expansion causes a thrust pin to move, which in turn activates the obturator, resulting in the opening of the valve. The valve is calibrated to open when temperatures exceed 90°C. 2. **Pressure Regulation:** The obturator is countered by a predetermined spring. Upon reaching the designated pressure setting, the obturator elevates, fully opening the outlet. The pressure setting is based on the maximum allowable pressure for the system. As temperature and pressure lower, the valve automatically re-closes within the established tolerances. **Specifications:** - **Size:** 3/4" - **Connections:** Male x Ø 22 mm, featuring a compression fitting for copper piping - **Materials:** DZR (Dezincification Resistant) - **Medium:** Water - **Set Pressure:** 10 Barg - **Discharge Rating:** 25 kW - **Temperature Setting:** 90°C - **Probe Length:** 99 mm - **Product Code:** 309500CST - **Certifications:** WRAS approved, CE marked Ensure the safety and efficiency of your hot water system with the reliable Altecnic / Caleffi 309 Pressure & Temperature Relief Valve. Perfectly suited for domestic use, this valve meets strict industry standards while optimising your heating system's performance.

The Brownall Air Eliminator is essential for any heating system to effectively eliminate air pockets. This reliable valve can withstand a maximum pressure of 10 bar and operates efficiently at temperatures of up to 93°C. Formerly marketed as the Charles Winn Automatic Air Eliminator, more than 200,000 units have been sold across the UK over the past 25 years. Many of these valves remain in service today, demonstrating their exceptional durability and ability to provide long-term, trouble-free operation.

Specifications

• Connections: 1/2" BSP Female Screwed Outlet x 3/8" BSP Screwed Male
• Maximum System Pressure: 10 Barg
• Temperature Range: -20 to 93°C