Valve filetype pdf

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Product added to cart X. How We Use Cookies: Ideal for water, fertilizer, keysyone and other liquids compatible with o-ring seats as shown. Click OK to extend your time for an additional 30 minutes. Lightweight, wafer type check valve with face-to-face dimensions according ISOtable 5 long High flow capacity featuring a special shaped disc with a large opening angle filwtype in high Kv values Spring loaded disc for positive shut-off Choice of cast iron or stainless steel body types Field replaceable O-ring seat Internal travel stop prevents the disc from slamming against the pipe Excellent low pressure shut-off The standard low pressure shut-off is less than 0.

View All New Items. Emerson is where technology and engineering come together to create solutions for the benefit of our customers, driven without compromise for valvf world in action. Your session is about to timeout due to inactivity. This is necessary for a valve problem. Initial state of a compressor there is very small gap between valve plate and suction reed valve due to the gasket. During the operation of a compressor the valve will be opened due the pressure difference between suction port and the internal of cylinder.

So some value has to be input, which the start point will be recognized by program. First closed condition is the fluid cannot flow across the interface and if a gap is open, which the fluid can flow across the interface without involving any boundary condition. The face is imposed no slip wall condition and zero heat flux condition. Last one is the initial condition about pressure and temperature on the domain. Next structure case will be introduced.

As FSI is the fluid and structure problem, structure has to be modeled individually. Later part is explained based on Fig. During the operation of a compressor, the valve is fluctuating and repeating the contact with valve plate. Assumption of a contact problem is frictionless and the used contact algorithm is rigid target method.

In this analysis part, heat transfer was considered. Until now there had been a lot of studies but there was not the case about considering heat transfer on the fluid-structure problem.

Also non-linear term such as impact, oil stiction and gas pulsation were considered to raise the exactness and reliability of FSI analysis. Absolutely the obtained results were compared to the experiment result of the valve dynamic. Before looking through deeply the results, the atmosphere analysis was implemented because the same experiment was already performed. As shown there are 4 oscillations during there suction process. And the period comparison is also reasonable except that the 2nd period displacement is slightly different between them.

The reason was why the analysis was implemented in 2D whereas experiment was real 3D system. As already mentioned in problem definition Fig. Particle movements are good way to understand how the fluid is flowing. At the suction process the valve is opened due to the pressure difference between the cylinder and suction port. Pressure will be shown later, but temperature is also very important factor because the high temperature during the operation weakens the valve and affects the fatigue to the suction reed valve.

Actually there were many efforts to know the temperature profile due the above reasons, but it had been very difficult to know because internal part is high pressure and there are no enough room for the installation for temperature sensor.

Needless to say to decide the phenomena of temperature profile it is prerequisite to compare the valve dynamic behavior and the pressure experiment results. First one is at the time of 0. This problem was solved using turbulence method.

So at the tip of the suction reed valve the velocity was changed dramatically. These flowing patterns are quite affecting to the suction reed valve and an efficiency of a compressor. And Fig. And it means the 2nd oscillation starts when the velocity value again goes into positive value.

At first time when the valve is opened the internal pressure and temperature was decreeing at some extent range due the pressure inside cylinder goes into the vacuum condition. And during the opening time of suction reed valve the temperatures between the cylinder and the suction port parts will be same; means going into the saturation state.

And last the starting point of compression. The temperature will go into very high. But to decide the temperature profile is right or not, the experiment of dynamics temperature profile has to be performed. But generally a compressor usually operates at 50 or 60 Hz which is or RPM. So even if a very precision temperature sensor used it is hard to get the dynamic temperature profile. So it has to be utilized to know the tendency of temperature inside cylinder. Next the valve dynamic behavior will be discussed.

Valve dynamic behavior affects a lot to the efficiency and radiated sound pressure level. The comparing data will be used the obtained experiment data. As shown, the opening timing of suction reed valve during the suction process because the oil stiction which on the surface valve plate. This oil stiction force delayed the opening timing of suction reed valve compared to the FSI analysis result.

In experiment result plot the data was obtained in real phenomena. To solve in this problem 3 D FSI analysis result needs to be implemented. In experiment case the strain gauge and pressure sensor was used to get the valve dynamic behavior and pressure data. And in FSI analysis, with the same result in experiment the other result such as temperature and velocity profiles were obtained and these results actually were impossible to be obtained in experiment.

In this reason model updated FSI result gives more understanding phenomena about the valve. And as future work 3 D FSI analysis needs to be implemented. Shape optimization will be performed without a fluid problem because the subjective and objective function for optimization is only related to the structure problem.

Anyway only structure part for shape will be introduced after that the initial and the optimized will be solved using ADINA for the contact. Lastly the design variables were the length, radius, width and thickness as shown in Fig. How Does a Centrifugal Pump Work?

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