The vibration of the regulating valve is generally divided into two states. One is the overall vibration of the regulating valve, that is, the whole regulating valve vibrates frequently on the pipeline or base. The other is the vibration of the regulating valve core, which can be seen from the frequent movement of the valve stem up and down. The causes of these two kinds of vibration and their treatment measures are analyzed as follows:

调节阀的振动与噪声根据其诱发因素不同，大致可分为机械振动、气蚀振动和流体动力学振动等原因。

According to the different inducing factors, the vibration and noise of control valve can be roughly divided into mechanical vibration, cavitation vibration and hydrodynamic vibration.

1、机械振动

1. Mechanical vibration

机械振动根据其表现形式可以分为两种状态。一种状态是调节阀的整体振动，即整个调节阀在管道或基座上频繁颤动，其原因是由于管道或基座剧烈振动，引起整个调节阀振动。此外还与频率有关，即当外部的频率与系统的固有频率相等或接近时受迫振动的达到限值、产生共振。另一种状态是调节阀阀瓣的振动，其原因主要是由于介质流速的急剧增加，使调节阀前后差压急剧变化，引起整个调节阀产生严重振荡。

Mechanical vibration can be divided into two states according to its manifestations. One state is the overall vibration of the regulating valve, that is, the whole regulating valve vibrates frequently on the pipeline or base. The reason is that the vibration of the whole regulating valve is caused by the violent vibration of the pipeline or base. In addition, it is also related to frequency, that is, when the external frequency is equal to or close to the natural frequency of the system, the forced vibration reaches the limit and produces resonance. The other state is the vibration of the regulating valve disc, which is mainly due to the sharp increase of the medium flow rate, resulting in the sharp change of the differential pressure before and after the regulating valve, resulting in serious oscillation of the whole regulating valve.

2、气蚀振动

2. Cavitation vibration

气蚀振动大多发生在液态介质的调节阀内。气蚀产生的根本原因在于调节阀内流体缩流加速和静压下降引起液体汽化。调节阀开度越小，其前后的压差越大，流体加速并产生气蚀的可能性就越大，与之对应的阻塞流压降也就越小。

Cavitation vibration mostly occurs in the control valve of liquid medium. The root cause of cavitation is the liquid vaporization caused by the acceleration of fluid contraction and the decrease of static pressure in the control valve. The smaller the opening of the regulating valve, the greater the pressure difference before and after it, the greater the possibility of fluid acceleration and cavitation, and the smaller the corresponding blocking flow pressure drop.

3、流体动力学振动

3. Hydrodynamic vibration

介质在阀内的节流过程也是其受摩擦、受阻力和扰动的过程。湍流体通过不良绕流体的调节阀时形成旋涡，旋涡会随着流体的继续流动的尾流而脱落。这种旋涡脱落频率的形成及影响因素十分复杂，并有很大的随机性，定量计算十分困难，而客观却存在一个主脱落频率。当这一脱落频率(亦包括高次谐波)在与调节阀及其附属装置的结构频率接近或一致时，发生了共振，调节阀就产生了振动，并伴随着噪声。振动的强弱随脱落频率的强弱和高次谐波波动方向一致性的程度而定。

The throttling process of medium in the valve is also the process of friction, resistance and disturbance. When the turbulent fluid passes through the regulating valve around the fluid, it forms a vortex, which will fall off with the wake of the continuous flow of the fluid. The formation and influencing factors of vortex shedding frequency are very complex and random, so it is very difficult to calculate quantitatively, but there is a main shedding frequency objectively. When this shedding frequency (also including high-order harmonics) is close to or consistent with the structural frequency of the regulating valve and its accessories, resonance occurs, and the regulating valve generates vibration and noise. The intensity of vibration depends on the intensity of shedding frequency and the consistency of higher harmonic wave direction.