Bleeder valve - with non-return valve, 1/2", nickel

Product detailed description

Bleed valves with non-return functions are essential components in heating and plumbing systems where automatic air removal is required without the risk of reverse flow. These valves are commonly found in residential, commercial and industrial buildings, particularly in closed-loop systems such as underfloor heating, radiators, and domestic hot water circuits. Installers often encounter these valves during commissioning, maintenance or system upgrades, where air pockets can cause inefficiencies and noise. The inclusion of a non-return function ensures that once air is expelled, the system remains sealed, preventing the ingress of air or other fluids from downstream.

Correct installation and selection of bleed valves depend on system pressure, media type and temperature range. The valve must be positioned to allow air to escape freely while maintaining hydraulic integrity. In systems where multiple bleed points exist, coordination with other control and safety devices is crucial to ensure balanced operation and avoid overloading the system.

Technical parameters

Installation and connection

Installation involves positioning the valve at a high point in the system where air tends to accumulate. The valve features a 1/2 inch thread size, typically a male BSP (British Standard Pipe) thread, which should be matched with the corresponding female fitting. Prior to installation, inspect the sealing surfaces for damage and ensure the thread is clean and free from debris. Apply a suitable sealing compound or PTFE tape to prevent leaks. A common mistake is misalignment of the valve body, which can obstruct airflow or cause uneven stress on the connection. Always verify the direction of flow indicated on the valve body to ensure correct orientation of the non-return function.

Compatibility and accessories

This bleed valve is designed for integration with standard heating and plumbing systems using copper, steel or plastic piping. It is compatible with radiators, heat emitters, and circulation pumps. For optimal performance, it should be used in conjunction with pressure-reducing valves, expansion vessels and temperature sensors. No additional accessories are required for basic installation, but in complex systems, it may be necessary to include isolation valves for maintenance purposes. No alternative or related products are specified for this model.

Technical background for designers

The operating principle is based on a float mechanism that opens the bleed orifice when air accumulates above the float level. The non-return valve prevents fluid or steam from escaping once the system is pressurised. The design ensures that the bleed mechanism remains isolated from the system media, reducing the risk of clogging from particulate matter. System designers should consider the valve’s location in relation to other control devices and ensure that the system pressure does not exceed the PN10 rating to maintain long-term efficiency and service life.

Service and operation

During operation, the valve requires minimal maintenance. Periodically check for signs of leakage or blockage, especially after periods of inactivity or during seasonal system changes. If air accumulation is observed despite the valve being installed, inspect the non-return function for possible failure or debris buildup. There are no defined service intervals in the provided information, but regular visual inspections are recommended as part of general system maintenance.

Frequently asked questions

Can this valve be used in steam heating systems?
It is suitable for steam systems provided the operating temperature does not exceed +120°C and the pressure remains within the PN10 rating.

Is the non-return function adjustable?
No, the non-return function is fixed and cannot be adjusted by the user.

Can the valve be installed horizontally?
Yes, but it must be oriented according to the flow direction marked on the body to ensure proper function.

What media types are supported by this valve?
The valve is designed for use with water-based media in heating and plumbing systems.