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臥式泡沫泵的氣蝕余量（NPSHr）是一個關(guān)鍵參數(shù)，它直接影響泵的性能和壽命。然而，由于臥式泡沫泵可能具有不同的設(shè)計和用途，因此其具體的氣蝕余量可能會有所不同。
一般來說，氣蝕余量是指泵入口處單位重量液體所具有的超過汽化壓力的富余能量，單位通常用米（水柱）來表示。在臥式離心泵中，氣蝕余量是影響其性能的關(guān)鍵因素之一，因為氣蝕可能導(dǎo)致泵的效率降低、壽命縮短，嚴(yán)重時甚至導(dǎo)致泵的失效。
對于臥式泡沫泵而言，其氣蝕余量的具體數(shù)值需要根據(jù)泵的設(shè)計、使用條件以及輸送介質(zhì)的特性來確定。通常，制造商會在泵的產(chǎn)品樣本或特性曲線上提供必需汽蝕余量（NPSHr）的信息，以供用戶參考。
The cavitation allowance (NPSHr) of horizontal foam pump is a key parameter, which directly affects the performance and life of the pump. However, as horizontal foam pumps may have different designs and applications, their specific cavitation allowance may vary.
Generally speaking, cavitation allowance refers to the excess energy per unit weight of liquid at the pump inlet that exceeds the vaporization pressure, usually expressed in meters (water column). In horizontal centrifugal pumps, cavitation allowance is one of the key factors affecting their performance, as cavitation may lead to a decrease in pump efficiency, shortened lifespan, and even pump failure in severe cases.
For the horizontal foam pump, the specific value of its cavitation allowance needs to be determined according to the pump design, service conditions and the characteristics of the transmission medium. Usually, manufacturers will provide necessary NPSHr information on the product sample or characteristic curve of the pump for user reference.
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