Section A A

FIGURE 8 Automatic vent valve (Nash Engineering)

removes the air from the pump and suction line via the vacuum header and priming valve. Liquid rises up the suction line and fills the pump. The liquid cannot enter the vacuum header because the float mechanism in the priming valve closes when the liquid reaches it.

If, for any reason, the liquid level in the pump drops, the priming valve immediately opens and the vacuum restores the liquid level.

The pumps are thus kept permanently primed.

Automatic priming systems using ejectors are also feasible, and several such systems are commercially available.

Survival Treasure

Survival Treasure

This is a collection of 3 guides all about survival. Within this collection you find the following titles: Outdoor Survival Skills, Survival Basics and The Wilderness Survival Guide.

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