4. Repair of the Impulse Nozzle:
Impulse nozzle
type 20, 40 and 50
2.0
Nozzle head
3.1
Nozzle tube
3.2
Hexagon reducing socket
3.3
Union (insert part)
Impulse nozzle type 40 and type 50:
Impulse nozzle type 20:
The nozzle head is screwed onto the nozzle tube
since 2015: screwed nozzle head (
Ø
21,3 mm)
until 2014: riveted nozzle head (
Ø
21,0 mm)
After disassembly of the impulse nozzle, inspect nozzle tube and nozzle head. In case of significant corrosion or vi-
sible wear, the parts should be replaced. Particulary if the coil spring of the check valve has lost its tension and
the plate spring on the end face of the cap is loose, the nozzle head must be replaced. Check the function of the
non-return valve mechanism: it should just about be possible to turn the plate spring by hand on the end face of
the cap, and the nozzle bolt must be movable in its guide.
The head of the impulse nozzle is hardened and agglutinated to the nozzle tube (screwlock).
Do not screw off by force!
The nozzle head type 20 with a diameter of 21,0 mm (old design) can not be screwed off and
changed because it is riveted! Only the heads with a diameter of 21,3 mm (new design) can be
screwed off and changed.
a)
For change of the nozzle heads carfully heat it with a propane/butane gas flame up to about 200°C, until
the screwlock disintegrates (white smoke). Clamp the nozzle head into a vice with pipe clamping jaws and
screw off the nozzle tube by turning the hexagon reducing socket with screw-wrench. (The hexagon redu-
cing socket is factory-made firmly agglutinated with the nozzle tube and should not be detachable).
b)
Let nozzle tube cool down, clean the thread with a steel brush and screw on new nozzle head, using a sui-
table screwlock (Marston-Domsel, Loctite or similar).
5. Repair of the Solenoid Valves:
For technical data sheets and spare parts see:
Buschjost-Valves:
http://www.buschjost.com/pdf/E82960.pdf
ASCO-Valves:
http://www.asconumatics.eu/images/site/upload/_en/pdf1/x003aagb.pdf
!
!
