Under conditions of small opening and large pressure difference,the throttle effect of the flow control valve causes prominent aerodynamic noise problems in the valve body.In order to reduce the aerodynamic noise of the valve body and find out the main location of the noise source,the method of installing a noise reduction sleeve at the throttle port can achieve good throttling,noise reduction and flow stabilization effects.This paper introduced the structure,main characteristics,noise reduction methods and working principle of the noise reduction sleeve of the control valve.An acoustic calculation method suitable for valve aerodynamic noise calculation was introduced,and numerical analysis and experimental verification were used to compare the sound pressure levels when the valve was equipped with noise reduction sleeve.And the effect of noise reduction sleeve in the valve on noise reduction was verified.
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