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配管製品 CALEFFI 574 seriesのPDF マニュアルをオンラインで閲覧またはダウンロードできます。CALEFFI 574 series 12 ページ。 Testable, reduced pressure zone backflow preventer
CALEFFI 574 series にも：マニュアル (16 ページ)

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Close downstream

-Permanent leakage

shut-off valve

-No leakage

-Discharge does not

open. Leakage is

Close upstream

minimal and lasts

shut-off valve and

more than 1 minutes.

open upstream

-Discharge opens

pressure control cock

abruptly, emptying in

less than 1 minute.

Open downstream

-Continuous discharge

shut-off valve

-No discharge

RAPID INSPECTION PROCEDURE

Upstream valve or

discharge valve

leaking

Discharge blocked

Downstream valve

leaking

Dismantle and

inspect

Dismantle and

inspect

Dismantle and

inspect. Put back

into operation.