3.
Mode of Operation
The membrane valves with bellow unit DELTA MF4 have been
developed for use in the brewing and beverage industries,
dairy and food applications as well as in the chemical and
pharmaceutical industries.
The function of the DELTA MF4 valve is to shut off line sections.
The membrane valves with bellow unit offer optimum protection
of the product in hygienic and aseptic applications.
Product safety is provided by the hermetic separation of the product
chamber from the environment (atmosphere) by a metal bellow.
-
Operation by pneumatic actuator with air connection,
reset by spring force.
-
By different assembly of the actuator, the following designs can
be realized:
NC:
actuator normally closed
("fail-down": air-to-raise, spring-to-lower)
NO:
actuator normally open
("fail-up": air-to-lower, spring-to-raise)
-
The inner parts of the actuator are maitenance-free.
-
The cleaning of the inner area of the valve is undertaken during
CIP cleaning of the line system.
-
Leakages at the bellow unit are indicated at the leakage drain in
the yoke area.
-
For the pneumatic control of the valve, a control unit is installed
on top of the actuator.
-
The yellow luminous diodes installed in the control unit indicate
the position of the valve rod.
3
control unit
DELTA CU
DELTA MF4
valve position
indicator
actuator
yoke
leakage
indicator
housing
MF4 standard design
valve seat sealing
by profile seal (seat seal)
MFO4 design
valve seat sealing
by o-ring
UK
DELTA MF4-UK0.qxd / 12.2004
Membrane Valve with Bellow Unit
DELTA MF4
Operating Manual rev. 0
