5. Flow technics and flow acoustics parameters for SAMSON valves

5. Fluidic and acoustic flow parameters for SAMSON valves

5. Fluidic and acoustic flow parameters for SAMSON valves

5.1. value and value

take from catalogue for plug valves

5.2. z value, linear control valves

dependent on load and seat diameter and nominal size

dependent on type

here: 1-level model

Butterfly valves (all types)

dependent on load

VETEC 72.2 plug valves

dependent on load and seat diameter and nominal size

to be taken from the VETEC catalogue.

5.3. value

On the basis of numerous measurements (also butterfly valves)

5.4. value

5.5. and constants

Linear control valves

and dependent on

load or

Seat diameter / nominal size diameter

no noise reduction / with noise reduction ( flow divider I or III)

in addition to differential pressure ratio x

Type 240 / 250 without flow divider

Type 250 with flow divider I

Type 240 with flow divider I

Type 240 / 250 with flow divider III

: all linear control valves

Butterfly valves

and dependent on

load or

no noise reduction (swing-through, step-seated) /
with noise reduction (angle-seated/low-noise)

in addition to differential pressure ratio x

and e.g. Type 3331

Plug valves

and dependent on

load or

Seat diameter / nominal size diameter

no noise reduction / with noise reduction (noise throttle pack with screens)

in addition to differential pressure ratio x

VETEC 72.2 plug valve

VETEC 72.2 with noise throttle pack (number of screens)

: all plug valves

5.5. value VDMA 24422 (1979)

Linear control valves, Types 240 and 250

without flow divider

with flow divider I, type 250

with flow divider I, type 240

with flow divider III, both types

other types unknown, use of VDMA 24422 (1989) or SAMSON standard

5.6. and constants

with VDMA 24422 (1989) dependent on incorrect

with SAMSON standard procedure not shown here, but results are similar to above.

5.7. value

VDMA 24422 (1979)

= 0 dB, except for negative values (see VDMA 24422 (1979), liquids)

Flashing () difference from

VDMA 24422 (1989)

= 0 dB

Flashing () difference from

SAMSON standard on the basis of VDMA 24422 (1989)

Adaptation to measurement results

Flashing () difference from