Grundfos DMH 25 Série Notice D'installation Et De Fonctionnement page 16

3b
3a 2
Fig. 6 DMH 257
Pos. Components
1p Motor
2p Worm gearing
3p Eccentric
4p Recuperating spring (not with drive size 3)
5p Sliding plug
6p Piston
7p Crank
M Combined overpressure and degassing valve
E Degassing valve
9p Diaphragm protection system (AMS)
Q Dosing diaphragm
2 Dosing head
3a Suction valve
3b Discharge valve
L Stroke-length adjustment knob
F Oil-filling screw with dipstick
5.1.1 Combined overpressure and degassing valve
The combined overpressure and degassing valve (M) opens if
there is an excessive pressure build-up in the dosing system and
provokes the constant degassing of the hydraulic medium.
5.1.2 Diaphragm protection system AMS
The diaphragm protection system AMS (9p) has a keypad, which
is connected to the dosing diaphragm. The dosing diaphragm
oscillates freely in the dosing head and cannot be overstretched
due to a fault in the dosing system since the diaphragm protection
valve closes if such a fault occurs.
16
M
Q 9p 6p 5p 2p 3p 7p
1p
F
L