John Guest Drinks Acetal Single Check Valve

The John Guest Drinks Acetal Single Check Valve is designed to prevent the reversal of flow in beverage, potable water and treatment systems. By allowing flow in only one direction, the valve protects pipework and connected equipment from backflow or back siphonage contamination risks up to Fluid Category 2. This fitting is NOT suitable for Air or Vacuum.

This makes the valve particularly suitable for drinks dispense installations where maintaining hygienic separation between supply lines and equipment is essential. It is commonly used in beer dispensing systems, water treatment installations, and beverage supply lines to prevent unwanted reverse flow that could contaminate upstream pipework. The internal valve mechanism is engineered with a low headloss design, helping to minimise pressure drop while still providing reliable backflow protection. Maintaining low resistance is especially important in beverage systems where stable flow and pressure contribute to consistent dispensing performance.

Installation is quick and straightforward thanks to John Guest push-fit technology. Tubing simply pushes into the fitting to create an immediate leak-tight seal without tools, sealing agents or hot works. Stainless steel collet teeth grip the pipe securely while nitrile O-rings ensure reliable sealing under pressure. Manufactured from durable acetal copolymer, the valve is resistant to scale build-up and suitable for potable liquids, foodstuffs and intermittent hot water applications up to 50°C, in accordance with the British Beer & Pub Association Code of Practice.

What is Fluid Category 2?

• A Fluid Category 2 rated check valve means the valve is designed to protect against backflow contamination, where the downstream water is still safe but no longer strictly potable.
• Typical reasons water becomes Category 2 include: Temperature change, taste change and slight aesthetic changes, but it MUST not contain harmful substances.

• Backflow protection: Prevents reverse flow contamination up to Fluid Category 2.
• Low headloss design: Maintains stable flow performance in dispense systems.
• Push-fit installation: Tool-free connection with instant leak-tight seal.
• Secure collet grip: Stainless steel teeth hold tubing without deformation.
• Food grade suitability: Suitable for potable liquids and beverage systems.
• Scale resistant construction: Helps maintain long-term valve performance.
• Fully demountable: Enables easy servicing and pipework changes.