Grundfos DDC Data Booklet

Construction
22
SMART Digital S
4
4. Construction
DDA and DDC
Fig. 19 Sectional drawing, DDA
Construction
The DDA and DDC pumps are motor-driven diaphragm
dosing pumps consisting of the following main parts:
Dosing head: Patented design with a minimum of
clearance space optimised for degassing liquids.
With integrated deaeration valve for priming and
venting complete with connection for a 4/6 mm or 0.17"
x 1/4" tubing. DDA-FCM/FC pumps have an integrated
pressure sensor in the dosing head.
Valves: Double-ball discharge and suction valve*
design for less clearance space - optimised for
degassing liquids. Spring-loaded valves for higher
viscosities are available as an option.
Connections: Robust and easy-to-use connection
packages for various sizes of tubing or pipes.
Diaphragm: Full PTFE diaphragm designed for long
life and universal chemical resistance.
Flange: With separation chamber, safety diaphragm
and drain hole.
Drive unit: Positive return crank with patented
noiseless spur gear drive, energy recovery spring for
high efficiency (only DDA), stepper motor, all mounted
in a robust gear housing.
Control cube: Containing operation electronics with
display, keys, click-wheel and protective cover.
Housing: Containing drive unit and power electronics
with robust signal sockets. The housing can be clicked
on the mounting plate.
Material specification
TM04 1533 1010
1
2
3
4
5
6
7
8
9
13
14
15 16
17
23
24
25
26
27
28
29
18 19
20
21
22
10
11
12
Pos. Description Material options
1 Stepper motor -
2 Cooling element** Aluminium
3 Suction valve, complete*** -
4 Valve ball, DN 4*
Ceramic Al
2
O
3
99.5 %,
SS 1.4401
5 Dosing head PP, PVC, PVDF, SS 1.4435
6 Safety diaphragm EPDM
7 Dosing head screw SS 1.4301
8 Diaphragm full PTFE
9 Pressure sensor -
10 Dosing head cover PP, SS 1.4301
11 Deaeration valve PP, PVC, PVDF
12 Deaeration valve O-ring EPDM/FKM
13 Discharge valve, complete*** -
14 Discharge valve O-ring EPDM, FKM, PTFE
15 Discharge valve ball, DN 8
Ceramic Al
2
O
3
99.5 %,
SS 1.4401
16 Discharge valve seat EPDM, FKM, PTFE
17 Discharge valve ball cage PP, PVC, PVDF, SS 1.4435
18 Flange PPO/PS 20 % gf
19 Energy recovery spring** EN 10270-2/VD SiCr
20 Connecting rod PA 6.6 30 % gf
21 Gear box PPO/PS 20 % gf
22 Housing PPO/PS 20 % gf
23 Control cube PPO/PS 20 % gf
24 Display cover PC
25 Operation PCB -
26 Click wheel PPO/PS 20 % gf
27 Hall sensor -
28 Power PCB -
29 Mounting plate PPO/PS 20 % gf
* Only for pumps up to 7.5 l/h with standard valves
** Only for DDA
*** Pump can be supplied with spring-loaded valves (Material: Tantal)

Grundfos DDC Specifications

General

Brand	Grundfos
Model	DDC
Category	Water Pump
Language	English