4
APV_SWmini4_GB-2_042020.indd
Single Seat and Change-over Valve
DELTA SWmini4
Instruction manual: GB – rev. 2
GB
APV
4. Mode of Operation
4.1.
General terms
The SWmini4 (DN10, 15, 20) shut-off and change-over valves have
been developed for the use in the brewing and beverage industries,
in dairy and food applications as well as for the chemical and
pharmaceutical industries.
The valves are designed for universal applications and stand out for
their increased mechanical reliability and absolute ease of handling.
-
Operation by pneumatic actuator with air connection at (A), reset by
spring force.
-
By different assembly of the actuator, the following designs are
possible:
NC (FS): actuator normally closed (air-to-raise, spring-to-lower)
NO (FH): actuator normally open (air-to-lower, spring-to-raise)
(illustrations show NC design)
- The inner parts of the actuator are maitenance-free.
- The standard valves are manufactured without support for proximity
switches.
- The valve position is indicated optically in the yoke area.
Indication in the upper yoke bore:
Valve position closed NC (FS).
-
A valve design with steam chamber (fig. 4.2.) is available.
During the process, the steam chamber is made subject to
creeping steam. Abduction of germs into the product-wetted area is
prevented by this means.
actuator
yoke
A
A
optical valve
position indication
valve housing
actuator
shut-off valve
change-over valve
yoke
optical valve
position indication
upper
valve housing
lower
valve housing
fig. 4.2.
IN
OUT
G⅛
