Rev. 1.2
Assembly Instructions - Spray Valve SMS-02
Page 33 of 34
Walther Systemtechnik GmbH
– D 76726 Germersheim
Telefon: +49 (0)7274-7022-0 Telefax: +49 (0)7274-7022-91
http://www.walther-2000.de
10.13 Description Pneumatic Needle-Stroke Adjustment 97800037
Description of Function
The pneumatic Needle Stroke Adjustment (PNA) is used for a remote-controlled change between two nee-
dle-stroke settings.
The front regulating screw (1; see pic.) determines the minimum needle stroke of the spraying device for a
PNA with applied pressure. The back regulating screw (2; see pic.) determines the additional (maximum)
needle stroke for a PNA without applied pressure.
Setting
For a pre-setting, the front regulating screw (1; see pic.) will be turned back (left turn) until no more raster
steps are possible. After that the back regulating screw (2; see pic.) will be turned to the front until stop (right
turn). Strictly follow this procedure to ensure a correct setting of both needle positions.
The spray application has to be activated/released in order to adjust both needle positions. The discharged
medium will be set to the desired minimum quantity (low needle stroke) through the front regulating screw (1;
see pic.). Then the desired maximum quantity (large stroke) will be set by turning back (left turn) of the back
regulating screw.
Important!
The PNA has to permit an opening of the needle in both positions (large and small stroke). In no case will it
be used to close the needle.
This is exclusively performed by the controls of the spray valve!
When a pressure of 6 bar will be applied to the PNA at the hose nipple (3; see pic.), the small needle stroke
has been set; the large stroke is set without pressure
.
Operation
You can switch between the stroke settings during operation via the hose nipple (3):
- Air pressure = 6 bar
- With applied air = low stroke
- With air turned off = large stroke
