APV DELTA DA3+ SLD, Operating Manual

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3. Mode of Operation
3
UK
DELTA DA3SLD-UK0.qxp / 12.2007
Double Seat Mixproof Valve with Seat Lift Detection
DELTA DA3+SLD
Operating Manual: Rev. 0
Due to its construction and mode of operation as well as to the
use of high quality stainless steel and adequate seal materials,
the double-seat mixproof valve DELTA DA3+SLD is suited for
applications in the food and beverage industries as well as in the
pharmaceutical and chemical industries.
- The valve opens from the top to the bottom in low leakage operation
(unpressurized drain of fluid residues via the annular cleaning gaps
in the seat area).
- Separation of two line passages by two balanced and
independently operating valve slides with intervening
leakage chamber.
- Arising leakages at the seat seals are discharged at (E) in
depressurized state.
- The standard double seat valve DELTA DA3+ SLD is equipped
with a Control Unit.
The 2 Hall sensors in the control unit and the two externally
installed proximity switches provide for the detection of the
following valve positions:
sensor 1 = valve position “seat lifting lower valve shaft”
sensor 2 = valve position “open”
sensor 3 = valve position “closed”
sensor 4 = valve position “seat lifting upper valve shaft”
- Operation by pneumatic actuator with air connection at (B) .
Reset by spring force into the safety limit position "closed".
B = Valve open
- Maintainable actuator (see 11.3 ).
- Cleaning of the leakage chamber is undertaken via the cleaning
connection
(C) .
- The Cleaning of the seat and shaft seal areas is realized by
operation of the air connections:
A1 = lifting of lower shaft
A2 = lifting of upper shaft
- Reset by spring force.
A1
seat lift cylinder
main cylinder
spring cylinder
valve housing
drain pipe
CIP
cleaning connection
B
C
E
A2
sensor 2
sensor 4
sensor 3
sensor 1
operating cam