22
DME
Construction
Sectional drawing, DME (2 to 48)
Construction
The DME pump is a motor-driven diaphragm dosing
pump consisting of the following main parts:
Dosing head: Designed with a minimum of clearance
space to optimise the priming and deaerating capabili-
ties. The dosing head has built-in valve housings.
Valves: Double-ball suction valve and single-ball
discharge valve. Spring-loaded valves are available as
an option.
Vent valve: For priming and deaeration complete with
connection for a 1/4” tubing.
Connections: Sturdy and easy-to-use connections for
various sizes of tubing, pipe thread or pipe cementing.
Diaphragm: PTFE-coated, textile-reinforced EPDM
diaphragm designed for long life.
Backplate: With separation chamber, safety diaphragm
and drain hole.
Drive unit: With diaphragm connecting rod, crank, belt-
drive and stepper motor, all mounted on a sturdy frame.
Cabinet: Containing drive unit, electronics, control
panel and various electrical connections.
The pump can be supplied with spring-loaded valves.
Spring material: Hastelloy.
The spring is not shown in the sectional drawing.
Material specification
TM01 9994 3600
14
13
2
4
5
6
7
8
3
9
15
116
17
18
10 11 12
26
20 19 21
24
2325
22
Pos. Description Material options
1 Backplate 20% glass-filled PP
2 Diaphragm Textile-reinforced EPDM, PTFE-coated
3 Valve assembly Includes items 4 to 8
4O-ring EPDM/FKM
5
Valve casing PP/PVDF/316 SS
6 Valve ball Ceramic/316 SS
7 Valve seat disk EPDM/FKM
8 Valve seat ring PP/PVDF/316 SS
9 Connection assembly Includes items 10 to12
10 Cone/thread piece PP/PVDF/316 SS
11 Clamping ring PP/PVDF
12 Union nut PP/PVDF/316 SS
13 Vent valve screw PP/PVDF
14 Vent valve ball Ceramic/316 SS
15 Vent valve O-ring EPDM/FKM
16 Cabinet 20% glass filled PP
17 Power/alarm cable Rubber
18 Dosing head PP/PVDF/316 SS
19 Drive belt Rubber, polyamide-reinforced
20 Connecting rod Steel
21 Origo sensor -
22 Crank shaft Steel
23 Power PCB -
24 Operation PCB -
25 Stepper motor -
26 Drive frame Aluminium
Dm123.book Page 22 Tuesday, February 8, 2005 8:24 AM
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