( 1) Change the unbalanced force of Ft direction usually adopt the method of change flow direction to change the direction of the role of the FI. Like to have a dg of 20 mm or direct single seat valve by flow closed type to open type, can easily solve the problem of the stability of the valve. ( 2) Avoid the valve itself not region unbalanced force FI change direction alternating, valve are prone to oscillation. Such as butterfly valves, usually within 5 ° ~ 10 °, 75 ° two alternating, so the minimum opening should be greater than 20%, open degree of 70 °; Again like two-seat valves, at 10% and 80% ~ 90% on opening alternating, in use should be avoided. ( 3) Replacement of stability, good stability of valve valve its unbalanced force change smaller, good guide, sleeve valve has this characteristic. When single, two-seater valve stability is poorer, can be used with sleeve valve. ( 4) Increase the spring stiffness of the simple method is to improve the stability of the common, such as change of 20 ~ 100 kpa spring to 60 ~ 180 kpa takong degree of spring. Using this method is mainly with the valve positioner, otherwise need to match the locator. ( 5) Reduce the response speed when the system requirements of Industrial Valves response or adjustment shoulds not be too fast, For example, when flow need to fine tune) And valve fast, or the system itself is a rapid response system, and the valve and a locator to speed the action, will produce overshoot and oscillation. To this, should reduce the response speed. Method are: (1) change the linear feature to logarithmic characteristics; (2) with the locator can be changed to converter, relay. 876 pneumatic diaphragm regulating valves work is not stable, generate oscillation, its reason have? 1) regulator output signal is not stable. (2) pipe or base violent vibration. (3) the valve positioner high sensitivity. (4) flow capacity C value too large. Work under the regulating valve in the small open state. (5) the throttling, and guide gap is too big. 6 stem friction force is big, easy to produce hysteresis sex oscillation. All landowners actuator stiffness is insufficient, can result in oscillation in the whole journey; Quantity is not enough, spring preload would occur in the low stroke oscillation.
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