The anti-siphon valve is located on the outlet of the pump. This strategic location works against gravity and prevents draining on the tank. The valve opens when pressure is applied from the pump and then closes airtight at the moment the pump pressure ceases to flow. The anti-siphoning valve will close more tightly when negative drainage occurs. Not only does the anti-siphon valve prevent someone from stealing gas, but it completely shuts out any unwanted contaminants with vacuum-tight sealing (made of thermoplastic) around the tank. The seal is a non-wet u-cup. This isolates the control spring.
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Relief and inlet settings vary on different anti-siphon valve models. To ensure quality, the consumer will purchase an anti-siphoning valve that is adjustable. The relief setting will be 5 to 100 pressure per square inch. The inlet pressure is set at most to 150 pressure per square inch. To reduce pressure drop during fuelling, the anti-siphoning valve will have a big fluoropolymer diaphragm design. The diaphragm is positioned in the valve to create a closed valve. When pressure surpasses the pressure differential (difference between liquid pressure in upstream and downstream flow), the valve opens.
Homes and offices will use anti-siphoning valves to prevent water from being siphoned from contaminated bodies of water. A contaminated body of water, for example, is toilet water. Outdoor facets in many facilities are designed to run to a hose or system of tubes immersed in a body of water. Such bodies of water include public swimming pools, laundry units (washing machines) and outdoor water bodies (fish ponds, garden ponds, fountains). The anti-siphoning device prevents water from back-flowing into fixtures (such as water facets) where people are likely to come into contact with the water.