Grundfos DMH 25X Installation And Operating Instructions Manual page 16

3b
3a 2 Q 9p
DMH 257
Pos. Components
1p Motor
2p Worm gear
3p Eccentric
4p Return spring (not with drive size 3)
5p Sliding sleeve
6p Piston
7p Crank
M Combined pressure-relief 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 pressure-relief and degassing valve
The combined pressure-relief 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
6p 5p 2p 3p 7p
1p
F
L