
The Bamax Non-Return Valve | COM4050-6 is a brass valve designed for applications requiring non-return flow control through threaded connections. Manufactured in Italy, the valve features a durable brass construction and British Standard Pipe (BSP) threads for connection to compatible threaded fittings.
The valve incorporates two male BSP connections, measuring 1/2" and 3/8", allowing it to connect components with the corresponding female BSP thread sizes. It also features an additional 1/8" BSP threaded connection, identified as dimension A in the manufacturer's specifications. The valve has a 9mm opening and a specified operating pressure of 16 bar.
As a non-return valve, its primary function is to permit flow in one direction while preventing reverse flow. This makes it useful in systems where maintaining the intended flow direction is important. Its brass construction and standard BSP threaded connections provide a practical solution for compatible installations requiring a non-return valve.

BSP stands for British Standard Pipe, an internationally adopted family of pipe thread standards used to connect compatible threaded components. BSP thread sizes are expressed in inches and refer to nominal pipe thread sizes rather than the actual outside diameter of the thread.
The Bamax COM4050-6 features 1/2" and 3/8" male BSP connections. These are designed to mate with compatible female BSP threaded fittings of the corresponding size.
When selecting a fitting, it is important to confirm the BSP thread size and connection type rather than relying solely on the measured outside diameter.
The following reference provides the thread pitch and major diameter for the BSP sizes relevant to this valve.
| BSP Nominal Size | Dash Size | Threads Per Inch (TPI) | Thread Pitch | Major Diameter |
|---|---|---|---|---|
| 1/8" | -2 | 28 | 0.907mm | 9.728mm |
| 3/8" | -6 | 19 | 1.337mm | 16.662mm |
| 1/2" | -8 | 14 | 1.814mm | 20.955mm |
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