调节阀的弹簧刚度不足，调节阀输出信号不稳定而急剧衬氟衬胶阀变动易引起调节阀振荡。还有说选阀的频率与系统频率相同或管道、基座剧烈振动，使调节阀随之振动。

The spring stiffness of the regulating valve is insufficient, the output signal of the regulating valve is unstable, and the sudden change of the fluorine lined rubber valve easily causes the oscillation of the regulating valve. It is also said that the frequency of the selected valve is the same as the frequency of the system or the severe vibration of the pipeline and base makes the control valve vibrate.

选型不当，调节阀工作在小开度存在着急剧的流阻、流速、压力的变化，当超过阀刚度，稳定性变差，严重时产生振荡。

There is a sharp change of flow resistance, flow velocity and pressure in the small opening of the regulating valve. When the valve stiffness is more than the valve, the stability becomes worse and the oscillation occurs when the valve is serious.

冷库调节阀经常出现的问题是卡堵，常出现在新投运系统和大修投运初期，由于管道内焊渣、铁锈等在节流口、导向部位造成堵塞使介质流通不畅，或调节阀检修中填料过紧，造成摩擦力增大，导致小信号不动作大信号动作过头的现象。

The problem that often appears in the cold storage valve is blocking, often appearing in the new transportation system and the early stage of overhaul and transportation. Because of the blockage in the throttle and the guiding position, the circulation of the medium in the throttle, the rust and so on in the pipe is not smooth, or the packing of the regulating valve is too tight in the overhaul of the valve, resulting in the increase of the friction force, which causes the small signal not to act big signal. The phenomenon of the head.

调节阀泄漏，阀杆长短不适。气开阀，阀杆太长阀杆向上的(或向下)的距离不够，造成阀芯和蝶阀阀座之间有空隙，不能充分接触，导致关不严而泄漏。同样气关阀阀杆太短，导致阀芯和阀座之间有空隙，不能充分接触，导致关不严而泄漏。

Regulating valve leakage, valve stem length and short discomfort. Air opening valve, the valve stem too long stem up (or down) distance is not enough, causing the valve seat and valve seat gap between the seat, not fully contact, causing tight and leakage. Similarly, the gas valve stem is too short, resulting in gaps between the spool and the valve seat, which can not be fully contacted, resulting in serious leakage.

管道、基座剧烈震动通过增加支撑消除振动干扰;选阀的频率与系统频率相同，则更换不同结构的阀。

The vibration of pipeline and base can be eliminated by increasing support, and the valve with different structure will be replaced if the frequency of the selected valve is the same as the frequency of the system.

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