The causes of noise generated by the valve can be divided into the following three categories: 1. Pressure reducing valve mechanical vibration noise; 2. Fluid dynamics noise; 3. Aerodynamic noise. First, the noise generated by mechanical noise Reducing valve components in the fluid flow will produce mechanical vibration, mechanical vibration can be divided into two forms: ①low-frequency vibration. This vibration is caused by the jet and pulsation of the medium due to the flow velocity at the outlet of the valve being too fast, the piping arrangement unreasonable, and the rigidity of the valve movable part being insufficient. ② high-frequency vibration. This vibration causes resonance when the natural frequency of the valve and the excitation frequency caused by the medium flow are the same. It is generated by the pressure reducing valve within a certain pressure reduction range, and the noise variation is large once the conditions are slightly changed . This mechanical vibration noise has nothing to do with the medium flow rate, mostly due to the unreasonable design of the valve itself. Measures to reduce the mechanical vibration noise is to reasonably design the clearance between the valve sleeve and the valve stem, the machining accuracy, the natural frequency of the valve and the rigidity of the movable parts, and the proper choice of materials. Second, hydrodynamic noise Hydrodynamic noise is generated by the fluid after turbulence and vortex flow through the decompression valve after the pressure relief valve, the resulting process can be divided into two stages: ①turbulence noise, that is, by the turbulent The noise generated by the interaction between the fluid stream and the relief valve or the inner surface of the pipe is relatively low in frequency and noise level and generally does not constitute a noise problem. ② cavitation noise, that is, the pressure reducing valve in the decompression process, when the fluid flow rate reaches a certain value, the fluid (liquid) began to vaporize, when the pressure in the liquid bubbles to a certain value, it will explode. Bubbles in the explosion, to produce local high pressure and shock wave, the impact of pressure up to 196 MPa, but away from the center of the explosion, the pressure decay sharply. This shock wave is a major contributor to cavitation and noise in the regulator. The measure to reduce mechanical vibration noise is to design the pressure reducing valve such that the pressure reducing value of the pressure reducing valve must be controlled below the critical value and preferably below the initial value of Δp because the actual pressure reducing value of the pressure reducing valve reaches At the initial value of Δp, cavitation begins to develop in the liquid and the noise will increase sharply. In addition, pay attention to the flow direction of the fluid medium relative to the flap. Third, the aerodynamic noise When the compressible fluid such as steam through the decompression valve within the decompression part, the mechanical energy of the fluid into sound and the noise generated is called aerodynamic noise. This kind of noise is a type of noise that makes up the majority of the noise in the pressure reducing valve and is the most troublesome to handle. The reason for this noise is divided into two situations, one is due to turbulence generated by the fluid, the second is due to the fluid to reach the critical flow rate caused by the shock wave. Aerodynamic noise can not be completely eliminated because it is inevitable that the pressure relief valve causes fluid turbulence when depressurized. In summary, fundamentally speaking, the noise generated by the pressure reducing valve is related to its own design and manufacturing process.
Terex Dump Trucks
Terex Rigid Dump Trucks perform extremely well in tough mining conditions, and are very easily maintained at a low cost of ownership.Our range of Rigid Dump Trucks provides the perfect balance of power, torque, and effective gearing coupled with optimum weight distribution to move more material in less time.
Our company is specializing in off-highway mining dump trucks and spare parts.we can supply TEREX rigid dump truck parts. We have terex 3303,3304,3305,3307,TR50, TR60, and TR100 for your needs.
Terex Dump Trucks,Terex Mining Dump Truck,Terex Rigid Dump Truck,Terex Haul Truck
Chengdu Svoda Machinery Equipment Co.,Ltd , https://www.svdequips.com