Mode Of Operation; General Terms - SPX FLOW APV DA4 Instruction Manual

APV
APV_DA4_UK-1_102018.indd
fig. 4.1
3
1
2
C
E
drain pipe
fig. 4.1.2.
DA4 with valve position indication
valve
open
valve
closed
8
4.

Mode of Operation

4.1.

General terms

Due to its construction and mode of operation as well as to the use
of high quality stainless steel and adequate seal materials, the DA4
double seat mix proof valve is suited for applications in the food
CU4
control unit
and beverage industries as well as in pharmaceutical and chemical
applications.
adapter
- The DA4 valve separates two line passages by two balanced and
independently operating valve shafts with an intervening leakage
chamber.
- The valve opens from the top to the bottom in a low-leakage design.
- Leakages are discharged via the drain pipe (E) in depressurized
state.
- The pneumatic actuator opens the valve via the air connection (1).
actuator
The spring force resets the valve into the "closed" safe position.
- The standard DA4 double seat mix proof valve is equipped with a
CU43 control unit.
- Cleaning of the seat and shaft seal areas is controlled via the air
connections.
2 = to lift upper shaft
3 = to lift lower shaft
- The spray connection (C) cleans the leakage chamber.
valve housing
- As an option, the closed and open positions of the DA4 can be
detected via proximity switches.
spray connection
prox. switch holder
operating cams
UK
Double Seat Mix Proof Valve
APV DELTA DA4
Instruction Manual: UK - rev. 1