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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Other Products and Services from Flowstar (UK) Ltd

Monobloc Mixer Tap With Aerator Nozzle - 900115

Monobloc Mixer Tap With Aerator Nozzle - 900115

Monobloc Mixer Tap with Aerator Nozzle

The 900115 is a robust monobloc mixer tap featuring a movable swan neck and an aerator nozzle. Constructed from solid brass, both the body and the swan neck ensure exceptional durability. The tap is finished with a Rilsan powder coating, making it highly resistant to wear and tear—a feature that has made it a popular choice in schools and laboratories alike.

The innovative aerator nozzle infuses air into the water stream, creating a softer flow and significantly reducing splashback. This design is particularly advantageous for rinsing various items, ensuring a cleaner and tidier workspace. The inlets are fitted with 2 x 3/8″ BSP connections, and the tap is supplied with braided tails for a flexible installation.

This monobloc mixer tap is also WRAS approved, confirming its compliance with UK regulations.

Several variations of the model are available. Please contact us for pricing and availability:

  • 900116 – Monobloc mixer tap with removable nozzle
  • 900119 – Monobloc mixer tap with a fixed swan neck and removable nozzle. The swan neck is brazed into position.

Specifications

Part No: 900115MIX-W
Description: Balanced flow laboratory monobloc mixer tap with aerated nozzle.
Applications: Standard laboratory mixer for hot and cold water.
Options: Removable nozzles available upon request.
Construction: All brass body, Rilsan plastic coating in light white (RAL9016), ABS grey rotating handwheels, and identification coding to DIN13792.
Connection and Mounting: 2 x 3/8” BSP female flat-ended flexible braided stainless steel hoses, 330mm long.
Pressure and Flow: Maximum pressure 100 PSI (recommended 20 PSI).
Mounting Hole: 30mm diameter. Flow rate at 20 PSI = 35 litres/minute.
Spares: Spare handwheel assembly - Part No 960180, Valve head works - Part Nos 950148.
WRAS: Approved materials.

Niezgodka Type 19.1 Safety Valve - SG Iron - Lever

Niezgodka Type 19.1 Safety Valve - SG Iron - Lever

Product Specifications

Sizes Available: 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
  • Disc: Metal, Viton, or Nylon (varies by pressure)
  • Joints & Seals: NBR, FPM, EPDM (dependent on model)

Head Type: A (Gas-tight Lever)

Suitable Mediums: Steam, Gases, and Liquids

Set Pressure Range: 0.05 to 130 Barg (depending on size)

Temperature Range: -10 to 280 degrees Celsius

Design Certification: TUV

Additional Information: We offer various other options (please refer to downloads), including different (a) O-ring and disc materials, (b) NPT connections, (c) orifice sizes, and (d) head types. For further details, please get in touch with us.

Optimised for SEO: Explore our premium pressure relief valves available in multiple sizes and materials, expertly crafted for reliability in handling steam, gases, and liquids.

Reliance RWC 12 Litre Aquasystem Potable Expansion Vessel Pre Set 3 Bar - XVES050040

Reliance RWC 12 Litre Aquasystem Potable Expansion Vessel Pre Set 3 Bar - XVES050040

**Stainless Steel Potable Water Expansion Vessel** Introducing the Reliance Valves Aquasystem Replaceable Membrane Potable Water Expansion Vessel, expertly engineered for potable water applications. This stainless steel expansion vessel is designed to accommodate the additional load in a water system as water heats up and expands in volume. By preventing pressure build-up in both sealed heating and cold water systems, these vessels ensure safe operation and optimal performance. Featuring a replaceable membrane, our vessels effectively prevent water from coming into contact with the steel shell, thereby eliminating the risk of corrosion and contamination. This innovation guarantees that your water remains safe for human consumption, while also allowing for quick and easy servicing on-site without the need for removal. **Key Features and Benefits:** - **Robust Stainless Steel Bolted Flange**: Designed to prevent corrosion and enhance durability. - **Extra Wide Membrane Opening**: Minimises operational noise caused by restricted flow. - **Internal Membrane Design**: Ensures no water touches the steel shell, preventing internal corrosion. - **Comprehensive Size Range**: Available from 2 to 5000 litres to suit various applications. - **Easy Maintenance**: All versions come with a replaceable membrane, facilitating servicing without removal. - **Pre-Charge Valve Included**: For convenient air pressure maintenance. - **Versatile Application**: Suitable for hot and cold water systems. **Specifications:** - **Capacity**: 12 Litres - **Colour**: White - **Pre-Set Pressure**: 3 Bar - **Maximum Pressure**: 10 Bar - **Minimum Temperature**: -10°C - **Maximum Temperature**: 99°C - **Height**: 295mm - **Diameter**: 280mm - **Water Connection**: 3/4" MBS **Product Code**: XVES050040 **Materials**: - **Shell**: Epoxy Coated Steel - **Membrane**: EPDM - **Bolted Flange**: Stainless Steel **Standards and Approvals**: - WRAS approved for models up to 1000 litres - CE marked as per Directive PED 97/23/CE - TUV Certified - Models from 1000 to 5000 litres comply with BS 6920 Invest in a reliable solution for your potable water systems with our Stainless Steel Expansion Vessel, ensuring safety and efficiency in every application.
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.