CALEFFI 574 series Manuel - Sayfa 3

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Ayrıca CALEFFI 574 series için: Manuel (16 sayfalar)

Sayfayı Yazdır

CAUTION: In the case of highly aggressive water, arrangements must be made to treat the water before

it enters the backflow preventer, in accordance with current legislation. Otherwise the valve may be

damaged and will not operate correctly.

ATTENTION: Dans le cas de l'eau fortement agressifs, des dispositions doivent être prises pour traiter

l'eau avant qu'elle ne pénètre dans le disconnecteur, conformément à la législation actuelle. Sinon la

soupape pourrait être endommagée et ne fonctionnent pas correctement.

Principle of operation

The backflow preventer consists of two check valves (4) and (5), a chamber known as "reduced

pressure area" (B) and of a discharge valve connected to the latter (3). The water entering the backflow

preventer opens the upstream check valve (4) and at the same time through the channel (1) acts

on the diaphragm (2) which closes the discharge valve (3) by means of the rod and then opens the

downstream check valve. The pressure in the intermediate chamber under normal operating conditions

is always less than the upstream pressure by at least 2 psi (140 mbar) as a result of a pre-calculated

pressure loss on the first check valve. This difference in pressure ∆p between the upstream (A) and

intermediate (B) areas can be specified on a safety basis so that in the event of damage occuring, or

a vacuum, the discharge valve is opened when the upstream pressure is still greater than the pressure

in the intermediate area by at least 2 psi (140 mbar). In the event of damage to the diaphragm, the

safety gasket under the thrust of the contrast spring (3) prevents the return of water upstream from

the discharge since there is no more ∆p equilibrium between the two areas.

NOTE: For the code 574050A, to ensure correct operation the air must be released in the upper part

of the diaphragm by means of the relief screw (6).

574004A

These codes include factory assembled inlet

and outlet isolation/shut-off ball valves, not

pictured.

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574050A