Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 5 of 5 for “"Rotary valve"”.
-
Novel design of a rotary valve using axiomatic design
Rotary valves have existed for millennia; and while they have developed tremendously since the first Roman valves, many of the same problems have persisted. The basic problems are caused by the coupling of functional requirements, which limits the valve's performance. Using axiomatic design (AD), …
-
Study of Active Valve Timing on Efficient Hydraulic Piston Motor Operations
Valve timing is critical to the performance of hydraulic piston motors and pumps. With non-optimal valve timing, the pressure differential across the valve during a valve opening or closing can be significant, causing transitional throttling loss and reducing the energy efficiency. The goal of this …
-
The interaction between rotary valves and pneumatic conveying pipelines
… work was to investigate the interaction between rotary valves and pneumatic conveying pipelines and the effect which this can have on overall system performance. A review of previous work and current industrial practice revealed that very little work has been published on this subject, although …
-
Achieving Efficient Control of Hydraulic Systems Using On/Off Valves
… typical method of control, which uses throttling valves to place restrictions in the flow path to dissipate excess power as heat. Several approaches to reducing throttling losses have been studied, such as using pumps, motors, or transformers to control individual actuators, or creating circuits …
-
High Speed Rotary PWM On/Off Valves for Digital Control of Hydraulic Pumps and Motors
… focuses on the development of innovative on/off valves for high performance, high efficiency control of fixed displacement hydraulic pumps and motors. On/off valves, the hydro-mechanical equivalent of transistors, enable the application of digital control techniques found in electrical systems to …