5. Product description and accessories
5.1 General description
The DMH 25X are positive-displacement pumps with hydraulic
diaphragm control. The operation procedure of the dosing pump is
shown in the sectional drawing. See figures below.
The rotational movement of the motor (1p) is converted via the
worm gear (2p) and eccentric (3p) into the reciprocating movement
of the piston (6p). The piston has a hollow bore and a row of radial
control holes, which provide a hydraulic connection between the
drive area and the piston stroke area. The sliding sleeve (5p)
covers the control holes during the stroke and seals the stroke area
from the drive area.
The hydraulic-driven movement of the PTFE diaphragm (Q)
displaces an equivalent volume of dosing medium from the dosing
head (2) into the dosing line. With the suction stroke, the piston
creates a low pressure, which is established in the dosing head.
The ball valve (3b) on the dosing side closes and the dosing
medium flows through the suction valve (3a) into the dosing head.
The stroke volume size is determined by the position of the sliding
sleeve. The active stroke length and corresponding average dosing
flow can be changed continuously and linearly from 10 % to 100 %
using the stroke-length adjustment knob and Verner scale (L).
1p
F
L
M
E
3b
3a
9p
3p
2p
5p
6p
2
Q
TM036448
DMH 251, 252
χ
ε
1p
F
L
M
E
3b
3a
9p
3p
2p
5p
6p
2
Q
4p
TM036449
DMH 253
14
English (GB)
Содержание DMH 25X
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