Characteristic Curves - Festo VZWM Operating Instructions Manual

VZWM
13

Characteristic curves

Calculating the pressure shock
1. Make a note of all known values of the tubing system in the grey fields of the
following table.
Sizes of the
tubing system
Flow velocity
Tubing length
Valve closing time
Pressure shock
Flow
Tubing diameter
Flow velocity
Sound velocity of the
medium used
Pressure shock
Fig. 9
2. Note the values of the table as points on the relevant axis of the nomogram
(è Fig. 10 1 ).
3. Connect two points of axes lying next to each other with a straight line.If this
line is lengthened, a further point can be defined (è Fig. 10 2 ).
4. Repeat points 2 and 3 with the new point gained by the lengthening.The result
will be the relevant pressure shock (è Fig. 10 3 ).
5. Note the pressure shock value ascertained in Fig. 9 unit:
fluid level per metre [mFs].
28
Unit Value
[m/s]
[m]
[min]
[mFs]
3
[m /h]
[mm] or
[inch]
[m/s]
[m/s]
[mFs]
Responsible Nomogram
nomogram axis numbers
Nomogram A 5
(è Fig 10) (è Fig. 10)
4
2
1
Nomogram B
6
(è Fig. 10) (è Fig 10)
7
8
9
10
Festo VZWM 0612NH English