Categories Starting with 'F' (Page #2)

A foot check valve is a placed in the water source below a surface pump. It allows the pump to pull water up, but does not allow the water to flow back down, thus keeping the pipe full of water, and "primed" while the pump is not running. Foot valves come in a variety of shapes, sizes, and materials. The most common materials are brass and plastic.

A flap check valve is a special valve with a flap rather than a disc that opens in the direction of normal flow and is forced shut when flows attempt to go in the reverse or opposite direction of normal flow.

A forward-curved fan is a type of centrifugal fan in which the blades are curved such that the ends of the blade are pointing in the same direction as the rotation of the fan wheel. Since forward-curved fans can offer the same volumes and pressure as other, similar-sized, backward-curved centrifugal fans at lower fan speed, they are generally quieter to operate. The ability to operate quieter than other centrifugal fans makes this fan an ideal choice for ventilation, air-conditioning, and other applications requiring high volume airflow with quite operation. However, forward curved fans are particularly sensitive to the particulates.