18
AsepticDiaphragmValves
PneumaticActuators
ECXActuator
CRANE ChemPharma, Saunders ECX type actuators are
designed to offer an extension to the EC size range while
maintaining a compact envelope size. The ECX is available
in sizes DN65 – DN150 (2.50” – 6.00”). The housing is
manufactured in coated silicon aluminum for optimum
chemical resistance and long life. With an extensive rangeof
spring packs available, Saunders offers an actuator to suit a
wide rangeofpressureand flowvariations.
Available in spring close, spring open, and double acting
modes of operation to suit process needs. Awide range of
options including switches, positioners, limit stop and visual
open/close indicationarealsoavailable.
Sizingcharts forCRANEChemPharma, Saunderspneumaticactuatorsare
availableat:
ECXActuatorwithModuleSwitchbox
Size range: DN65–DN150
Saundersdiaphragmvalvesofferexcellent control capabilities
within a broad range of pressure, flow or level control
applications.
Rangeability (ratio of maximum flow vs. minimum control
flow) of Saunders weir type valves is 35:1 extending beyond
the rangeofmost process and service control systems.
The positive shut-off characteristics of the valve can, inmany
instances, eliminate theneed for independent block valves, a
major component in thepiping system cost.
The inherent flowcharacteristics illustrated shows linearityup
to60%of travel (80%of flow).
The chart illustrates installed characteristics affected by the
dynamic friction loss for the remainder of the piping system.
Equal % characteristics can be obtained through the use of
characterisedpositioners.
Pressure recovery factor =0.7.
100
90
80
70
60
50
40
30
20
10
0
0 10 20 30 40 50 60 70 80 90 100
Auf
Zu
Hub in %
Durchfluß Qmax. in % ( P kons
100
90
80
70
60
50
40
30
20
10
0
0 10 20 30 40 50 60 70 80 90 100
Hub in %
Durchfluß Qmax. in %
SchnelleÖffnung
Linear
%ig
Diaphragmvalve
characteristic curves
% flow/% travel,weir
type
diaphragmvalve
