Mode Of Operation; General Terms - SPX FLOW APV D4 Instruction Manual

APV
APV_D4_D4SL_GB-3_022024.indd
fig. 4.1. D4 valve
1
actuator
valve housing
C
spray connection
E
drain pipe
fig. 4.1.1. D4 SL valve
control unit
3
1
actuator
2
valve housing
C
spray connection
drain pipe
E
8
4.
4.1.
CU41
control unit
adapter
-
-
-
-
-
-
-
-
-
CU43
adapter

Mode of Operation

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 D4
and D4 SL double seat mix proof valves are suited for applications
in the food and beverage industries as well as in pharmaceutical
and chemical applications.
The D4 and D4 SL valves separate 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).
The spring force resets the valve into the "closed" safe position.
The standard D4 valve is equipped with a non-seat lift actuator and
a CU41 control unit.
The standard D4 SL valve is equipped with an actuator including
seat lift function and a CU43 control unit.
D4 SL valve:
Cleaning of the seat is controlled via the air connections.
2 = to lift upper shaft
3 = to lift lower shaft
The spray connection (C) cleans the leakage chamber.
As an option, the closed and open positions of the D4 and D4 SL
can be detected via proximity switches.
fig. 4.1.2.
D4 / D4 SL with valve position indication
valve
open
valve
closed
prox. switch holder
operating cams
Double Seat Mix Proof Valve
APV DELTA D4 / D4 SL
Instruction Manual: GB - rev. 3
GB