KROHNE DA Flap-type EN - Manual (Page 5)

1.3
Key for Pressure Equipment Directive
PED / / /
1 2 3 4 5
1
P ressure Equipment Directive
2 Fluid
G Gases, liquefied gases, gases dissolved under pressure, vapors and those liquids
whose vapor pressure lies more than 0.5 bars over the normal atmospheric pressure
(1013 mbars) at the maximum permissible temperature
L Liquids whose vapor pressure lies a maximum of 0.5 bars above the atmospheric
pressure at the maximum permissible temperature
3 Fluid group
1 Group 1: Explosion-hazardous, highly flammable, readily flammable, flammable
(when the maximum permissible temperature lies above the flash point),
highly toxic, toxic, fire stimulating
2 Group 2: All the fluids not specified in Group 1
4 Category
3.3 In accordance with Article 3.3 of Directive 97/23/EC
I Category I to 97/23/EC
II Category II to 97/23/EC
III Category III to 97/23/EC
5 Conformity evaluation process
SEP Solid engineering practice
A Module A internal process inspection
A1 Module A1 internal process inspection with supervision of the acceptance
H Module H Comprehensive quality assurance
The PED key marking is contained on the rating plate of the instrument.
1.4 Functional
principle
A half-round plate, or flap, is fastened across the
direction of flow to a springmounted rotating spindle
in a ring that is inserted between flanges in a pipeline.
As the flow rate increases, the flap rotates counter
to the restoring force F of the spring in the direction
of flow.
The ensuing angle of rotation, depending on the
volume rate of flow, is transmitted via a magnetic
coupling to the indicator part.