Grundfos DMH 25X Installatie- En Bedieningsinstructies pagina 14

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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 figs 2-6.

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.

DMH 251, 252

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).

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