Central Heating Radiators Parts Accessories Technical Details
Radiator Valves Technical Overview
Radiator valves are critical components regulating hot water flow into a radiator, directly impacting room temperature and system efficiency. The two primary types are Thermostatic Radiator Valves TRVs and Manual Radiator Valves.
Thermostatic Radiator Valves TRVs
TRVs automatically adjust the water flow based on the ambient room temperature. They contain a sensor, typically a wax or liquid-filled element, which expands or contracts in response to temperature changes, consequently opening or closing the valve. This functionality allows for individual room temperature control, preventing overheating and saving energy. Common designs include angled and straight patterns, chosen based on pipework orientation relative to the radiator. Connection sizes typically adhere to 1/2" BSP threads for the radiator side and various sizes for pipe connections, such as 10mm, 15mm, or 22mm compression fittings. Key specifications include maximum operating pressure, typically 10 bar, and maximum fluid temperature, often up to 120°C.
Manual Radiator Valves
Manual valves operate via a handwheel, allowing users to manually open or close the valve to control water flow. They do not react to room temperature and provide a fixed flow rate once set. These are often used on one side of a radiator in conjunction with a TRV on the other, or in systems where room-specific temperature control is not prioritized. Like TRVs, they come in angled and straight configurations and use similar connection standards.
Lockshield Valves
Lockshield valves are installed on the return pipework of a radiator and are essential for balancing the central heating system. They are typically set during system commissioning to ensure an even distribution of hot water across all radiators, preventing some from running hotter than others. Once set, they are usually capped to prevent accidental adjustment. Their internal mechanism allows for fine adjustment of flow restriction without full closure, crucial for system hydraulic balance.
Radiator Brackets and Fixings
Radiator brackets provide the structural support for wall-mounted radiators. They are designed to securely hold the radiator's weight when filled with water. Materials commonly include steel, often powder-coated for corrosion resistance. Brackets must be selected based on the specific radiator model, panel configuration, and its overall weight. Standard fixings usually involve robust wall plugs and screws suitable for masonry or plasterboard, ensuring the radiator remains firmly attached to the wall. Some heavy-duty radiators may require specialized support systems or floor-standing legs.
Radiator Bleed Valves and Keys
Air can accumulate within a central heating system, leading to cold spots on radiators and reduced heating efficiency. Radiator bleed valves, often located at the top corner of a radiator, allow trapped air to be released. Manual bleed valves require a radiator key for operation, while automatic bleed valves passively release air without manual intervention. These components typically feature brass construction for durability and sealing integrity, often with a nickel or chrome finish.
Radiator Pipe Covers and Accessories
Pipe covers, often called shrouds or sleeves, are aesthetic components designed to conceal the copper or plastic pipework leading to and from radiators, providing a cleaner, more finished appearance. They are available in various finishes such as chrome, white, or various wood effects, and in diameters matching common pipe sizes like 10mm or 15mm. Radiator collars or rosettes are used at the point where pipes emerge from the floor or wall, providing a neat trim around the pipework entry.
Radiator Plugs and Bushes
Radiator plugs are used to seal unused tappings on a radiator, preventing leaks. Bushes are sometimes used to adapt different thread sizes or to provide a robust sealing surface. These components are typically made from brass and feature standard BSP threads (e.g., 1/2" BSP) with a suitable sealing washer or O-ring for a watertight connection. The correct thread size and type are crucial for leak-free operation.