Altecnic / Caleffi 309 Series Pressure & Temperature Relief Valve 3/4

Altecnic / Caleffi 309 Series Pressure & Temperature Relief Valve 3/4" 90°C 10 Bar - 309500CST

**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.
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Product Specifications

Available Sizes: 1/4" and 1/2"
Connection Types: Screwed BSPP or NPT
Material Composition: Stainless Steel 316
Disc Options: PEEK, Nylon, or Vespel
Joints & Seals: Diaphragm made from PEEK, Nylon, or Vespel
Suitable Medium: Steam, Gases, and Liquids
Maximum Inlet Pressure: 600 Barg
Outlet Pressure Range: 30 to 232 Barg

Discover our high-quality valves designed for optimal performance in various applications. Manufactured from durable Stainless Steel 316, these valves are suitable for steam, gases, and liquids, ensuring reliability and longevity. With options for connection types and disc materials, our products cater to diverse industrial needs. Maximise your system’s efficiency with our valves that can withstand a maximum inlet pressure of 600 Barg and an adjustable outlet pressure range from 30 to 232 Barg. Ideal for professionals seeking dependable solutions in challenging environments.

Altecnic / Caleffi 309 Series Pressure & Temperature Relief Valve 1/2

Altecnic / Caleffi 309 Series Pressure & Temperature Relief Valve 1/2" 90°C 10 Bar - 309400CST

The Altecnic / Caleffi 309 Pressure & Temperature Relief Valve - 309400CST is designed to effectively control and limit the temperature and pressure of hot water in domestic storage heaters. This essential safety valve ensures that water temperatures do not exceed 100°C, preventing steam formation. When the temperature or pressure reaches its set limits, the valve releases a sufficient amount of water into the atmosphere, ensuring that both temperature and pressure return to safe operating levels.

**How It Works:**

The valve features a thermostat compound within the temperature sensor that is submerged in the hot water storage heater. As the temperature increases, the compound expands, moving a thrust pin that activates the obturator, thereby opening the valve. This mechanism is set to initiate opening at temperatures exceeding 90°C. Regarding pressure, the obturator, which is countered by a spring, lifts when the pressure reaches its designated limit, fully opening the outlet. The pressure setting is predetermined based on the system's maximum permissible pressure. As the temperature and pressure decrease, the valve automatically re-closes within the specified tolerances.

**Product Specifications:**

  • Size: 1/2"
  • Connections: Male x Ø 15 mm with compression fitting for copper pipe
  • Materials: DZR
  • Medium: Water
  • Set Pressure: 10 Barg
  • Discharge Rating: 10 kW
  • Temperature Setting: 90°C
  • Probe Length: 102mm
  • Product Code: 309400CST

**Notes:** WRAS approved, CE marked

This high-quality pressure and temperature relief valve is an indispensable component for maintaining the safety and efficiency of your domestic hot water system. Ensure optimal performance and compliance with regulations by choosing the Altecnic / Caleffi 309 Pressure & Temperature Relief Valve.

Niezgodka Type 7 Open Discharge Relief Valve

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**Product Specification** **Sizes Available:** 6", 8", 10", 12", 14" **Connections:** Flanged DIN or ANSI **Materials:** Carbon Steel (7.1) or Stainless Steel (7.2) **Disk Material:** Viton **Joints & Seals:** **Medium Compatibility:** Non-toxic steam and gases **Set Pressure Range:** 0.4 to 0.88 Barg (depending on size) **Temperature Range:** - Carbon Steel (7.1): -10 to +130°C - Stainless Steel (7.2): -60 to +130°C **Design Notes:** This product is designed to accommodate various applications, providing reliable performance under specific conditions. Ensure to choose the appropriate size and material for optimal results. Perfect for various industries requiring safe handling of non-toxic steam and gases.
Flowstar UK Ltd

Flowstar (UK) Ltd

Wiltshire Road, Kingston-upon-Hull, East Riding of Yorkshire, HU4 6PA, United Kingdom

Flowstar (UK) Ltd is a leading global supplier of safety, relief, and reducing valves. With strong partnerships across major manufacturers, we deliver precise, reliable valve solutions tailored to your needs. Email enquiries to sales@flowstar.co.uk or call us on +44 (0)1482 601030.