Control valve noise analysis

Cavitation and noise are two of the most common hazards of regulating valves in controlling high differential pressure fluids. Regulating valve noise is the main source of pollution in the petrochemical industry. In addition to the use of low-noise structure in the selection of the control valve, the valve operating conditions change is to eliminate or reduce cavitation and noise, the fundamental method. Regulating valve in the work, should pay attention to its noise situation, analyze the production mechanism of noise can better monitor the working status of the control valve and effectively deal with the problems that occur. (1) Mechanical vibration - When the spool moves horizontally in the sleeve, the clearance between the spool and the sleeve can be minimized or the sleeve with hard surface can be used. (2) Natural Frequency Vibrations - such as spools or other components all have an inherent vibrational frequency for which the characteristics of the spool can be changed by special casting or forging treatment, and other types can be changed if necessary The spool. (3) Spool instability - such as noise caused by pressure fluctuations of the fluid due to oscillating displacement of the spool, is usually caused by damping factors such as the actuator of the regulating circuit, for which the damping can be readjusted Coefficient or in the spool displacement direction plus damping facilities. (4) Mechanical fluidity of media - The media also emits noise when it flows in pipes or regulating valves. This is not explained in detail here (cavitation can also cause noise). Search Keyword: More Valve Technical Articles Mechanical Valves Product Information

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During this initial phase, Design Engineers, Tooling Engineers, Materials Engineers, Manufacturing Engineers, Quality Engineers, and Lab Technicians work together to determine product specifications, tooling component capabilities, tooling materials, operating limitations, and any required product enhancements and improvements. The team specifically looked for any potential issues with part geometry or tolerances that could result in poor steel condition or require special tool features such as lifters, slides and threading/unthreading. The physical and chemical properties of the selected resins are also evaluated in order to select suitable mold steels and review mold cooling. In addition to determining the proper vent location, a mold flow evaluation is performed to determine the optimal gate type and gate location.

The manufacturability review includes the validation of standard plastic design practices and the incorporation of tooling details to create the most robust design possible. Tool specifications and tool provenance are finalized and purchased component sources are qualified. A comprehensive Process Failure Mode Effects Analysis (PFMEA) was also completed.

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