Which type of valves are provided on handline firefighting nozzles?

For a long time, manufacturers have been using the ball valve for controlling the flow in the nozzle, as it is a proven design, operates well at the pressures used, and is relatively maintenance free. The ball can be of metal, or polymer based materials.

Another type of valve used nowadays is the slide valve, in which a hollow cylinder moves back and forth along the central axis, and seals against a polymer seat. Due to the movement of the cylinder, it causes a variation in the orifice gap between the cylinder and the seat and hence controls the flow.

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