Systèmes de dosage – construction verticale
CVD 1 (s) / CVD 2
Notice d’utilisation
TA450-11 / fr/en / 01.2017 / PM
www.sera-web.com
Sous réserve de modifications techniques !
Subject to technical modifications!
43
7.2.3 CVD2 – option
suction side (Pos. 300+350)
The dosing pumps can be equipped with a piping on the suc-
tion side as option. Each of these pipings includes a ball valve
as stop valve and a dirt trap.
The suction sides of each pump are separated from one an-
other so that the medium can be taken from different barrels.
The suction sides of the pumps can be connected when a fur-
ther option
“Connecting conduit on the suction side of pump 1
and pump 2” (Pos. 350)
is added.
Fig.22 Option suction side
7.2.4 CVD2 – option
diaphragm pulsation damper (Pos. 200)
The chemical is dosed by means of oscillating positive dis-
placement pumps. A pulsation damper can be integrated in the
pressure pipes for smoothing the pulsating flow of the pumps.
Fig.23 Option diaphragm pulsation damper
The following possibilities are given for the pump series CVD2
•
Installation of a pulsation damper in each dosing leg and
thus an independent operation of the pumps for different
applications
•
Connection of the dosing pumps through the additional
option
“Connection of the pressure side of pump 1 and
pump 2”
and installation of a common pulsation damper
•
Connection of the dosing pumps through the additional
option
“Connection of the pressure side of pump 1 and
pump 2”
and installation of a common pulsation damper
in each dosing leg. This enables a 100% standby opera-
tion of the dosing pumps.
(Connection of pressure side only possible on left con-
nection N1).
CAUTION !
Whether pulsation dampers must be installed or not, de-
pends on the design of the overall system and must be
determined from case to case!
Decisive factors are, among others, the pump size, the
pipe geometry (length and diameter), pipe losses, the geo-
detic height to be negotiated and the opening pressure of
injection fittings (which might be present) resulting from
the spring load.
7.2.5 CVD2 – option
piping of the overflow valve (Pos. 400)
When the overflow valves open, the medium can be led back
into the suction pipes via return pipes.
Fig.24 Option piping of the overflow valve
CAUTION !
This option may only be used when a multifunction device
is mounted, or when the backflow of the medium into the
corresponding tank is not hindered by a foot valve or simi-
lar in the suction pipe.
Inobservance of this note may result in damage to the sys-
tem, the pump or adjacent system parts.
