Valve Research Papers

Valve Research Papers-62
Hydraulic fracturing, as a mining technique, was first developed in 1947 and has proven to be very popular in the United States in recent years.

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We use cookies to make interactions with our website easy and meaningful, to better understand the use of our services, and to tailor advertising.And the total response time is a constant value with the increase of the spring pre-compression.Therefore, the value of the excitation voltage and the spring pre-compression should be selected when the curve is becoming flatten.Secondly, excitation voltage and spring pre-compression were adjusted respectively, and the response rules after adjusting were investigated.The research of the study shows: the response time tends to be inverse proportional to the excitation voltage during start-up, and it becomes a constant value with the increase of the excitation voltage; the response time is proportional to the spring pre-compression when the solenoid valve starts up, it is inverse proportional to spring pre-compression when the solenoid valve shuts down.more Abstruct-In conventional internal combustion (IC) engines, en-gine valve displacements are fixed relative to crankshaft position.If these valves are actuated as a variable function of crankshaft an-gle, significant improvements in fuel economy can be achieved. An electromechanical valve drive system using a cam-based mechanical transformer has been proposed to achieve variable valve timing in internal combustion engines.Attention is paid to the behaviour during transitions when the flow is decelerating.Flow reversal is often accompanied with the check valve slam, because the check valve closes with a delay after the flow changes its direction.Firstly, the numerical model was established after analyzing the solenoid valve during its start-up and shut-down.Comparing the simulation data with the practical data, it is verified that the numerical simulation model has a high feasibility.

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