Burkert Type 8611 User Manual
Page 77
77
FunctionsoftheConfigurationLevel
Overview of the valve opening times of the Bürkert process valves depending on the actuator size and pilot
pressure:
actuator size [dn]
pilot pressure
Opening time for valve [s]
closing time for valve [s]
50
6
2
2
5
4
63
6
2
3
5
3
4
4
80
6
4
5
5
5
Table 28:
Valve opening times for Bürkert process valves
0 – 10 - flow-rate control with motor valve and 0 - 10 V control
(For schematic representation see “Figure 37: Example of a flow-rate control with 0 - 10 V control”)
Technical description:
• Motor ball valve with 0 - 10 V control.
• The max. process value change between closed and open position of the valve amounts to 20 l/min.
• The control range of the valve is not restricted:
VALV, MIN = 0, MAX = 10
(see chapter “12.17. VALV - Test function and setting of the control range”).
• According to the manufacturer, the opening and closing time are 90 s each.
Calculation for K
p1
:
100 %
20 l/min
K
p1
=
= 5 % (l/min)
·
100
The opening or closing time for the valve is taken into consideration by the reset time T
n
. As start value for T
n
about 60 - 70 % of the valve opening time can be taken.
2P – T
- Temperature control with open/closed valve
Technical description:
• Solenoid valve.
• The process value change between closed and continuously opened position of the valve amounts to 10 °C.
• The time for the temperature change amounts to 20 s.
Calculation for K
p1
:
100 %
10 °C
K
p1
=
= 10 % °C
• The reset time T
n
can be set between 15 - 20 s.
• With the controller cycle time T
reg
the switching frequency of the valve can be influenced.
Recommendation: T
reg
= 0.5 - 0.25 T
n
english
Type 8611