BURKERT兩位兩通調(diào)節(jié)閥帶8692定位器,德國寶德BURKERT調(diào)節(jié)閥

burkert 00227383寶德

BURKERT two position two way control valve with 8692 positioner may have obvious hysteresis, in the loop controllability must consider. In general, only the control system experts need to care about the dynamic performance of the valve, the application of the valve positioner of the formal considerations, such as discussed in the ninth chapter, will meet the needs of most control valve device.
BURKERT two position two way control valve with 8692 positioner flow characteristics, is the pressure difference between the two ends of the valve to maintain a constant, medium flow through the relative flow of control valve and its opening relationship. Flow characteristics of the control valve has linear characteristics, such as percentage characteristics and parabolic characteristics of the three. Control valve percentage characteristics, linear characteristics of control valve, parabolic valve characteristics.
The significance of the three fluence characteristics is as follows:

burkert 00227383寶德

(1) the percentage of properties such as (logarithmic) relative percentage of properties such as stroke and not a linear relationship between the relative flow, caused by unit at each point on the itinerary itinerary changes the flow rate change and this point is proportional to the flow rate of flow is equal to the percentage change. Therefore, it has the advantage of flow hours, small changes in flow rate, flow rate is large, that is, in different degrees of opening, with the same adjustment accuracy.
2) linear characteristics (linear), linear characteristics of the relative stroke and relative traffic in a linear relationship. The change of flow caused by the change of unit stroke is invariable. When the flow rate is large, the flow relative value changes little, and the flow rate is small, and the relative value of the flow changes greatly.
(3) parabolic characteristics
The flow varies in proportion to the two sides of the stroke, generally having intermediate characteristics of linear and equal percentage characteristics. From the analysis of the above three characteristics, we can see that in terms of its regulating performance, with the equal percentage characteristic as the optimum, its regulation is stable and its regulating performance is good. And the parabola characteristic is better than the linear characteristic, and can choose any kind of flow characteristic according to the request of the use occasion.