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Water Distribution
Published in Samuel C. Sugarman, HVAC Fundamentals, 2020
A plug valve is used primarily to balance water flow, but it may also be used for shutoff. A plug valve has a low pressure drop and good throttling characteristics. Some plug valves have adjustable memory stops. The memory stop is set during the final water balance so if the valve is closed for any reason it can later easily be reopened to the final balance setting.
Differential mass evacuation sampling technique for measuring refrigerant charge and oil retention of round tube plate fin heat exchangers (ASHRAE RP-1785)
Published in Science and Technology for the Built Environment, 2020
Abraham J. Lee, Christian K. Bach, Craig R. Bradshaw
Figure 5 shows the overall RHXCT assembly, including a sheet-metal support structure. The most crucial components in the RHXCT are the pneumatic rapid actuated shut-off valves (PSVs) at the inlet and outlet pipes as shown in Figure 6. The synchronized rapid PSVs allow to sample charge accurately. The PSVs consist of a plug valve (Swagelok P6T), a potentiometer (Mouser electronics 132B20103) to monitor position, a rotary pneumatic actuator (SMCpneumatics NCRB1BW30-90S), as well as flexible couplings (Ruland PSR series) to connect potentiometer and the plug valve to the actuator. P6T valves are selected due to their low friction, low mass inertia, high working pressure, and easy maintenance. The potentiometer is utilized to determine closing time of the valve and to confirm position of the valve. The two rotary actuators mounted one at each of the inlet and outlet pipes are simultaneously actuated by compressed air controlled by a single directional solenoid valve (Aventics R422103562). This solenoid valve has a minimum 10 milliseconds of switching time; thus ensuring synchronization of the actuation of the two PSVs of the RHXCT; the PSV closing speed was confirmed to be less than 60 milliseconds based on multiple repeated measurements using both valve position as well as acoustic signature.
Sustainable design of on-demand supply chain network for additive manufacturing
Published in IISE Transactions, 2019
Sudipta Chowdhury, Omid Shahvari, Mohammad Marufuzzaman, Jack Francis, Linkan Bian
As shown in Table 1, exhaust manifold (Amazon, 2017a), engine block (Amazon, 2017b), plug valve (United Valves and Engineers, 2017), and ball valve (Amazon, 2017c) are chosen as four product types for production ( = 4). Since these types of products have been previously fabricated using AM machines (Guo and Leu, 2013; Sea, 2017; The 3D Printing Association, 2017), and these products can be re-manufactured slightly differently from each other based on their applications, these four product types are chosen in this study. Contrary to the TM, one of the benefits of AM is the capability to manufacture slightly different products, irrespective of required molds and/or machines. For example, it is highly unlikely that two different models of cars have the same exhaust manifold and engine block. Thus, AM is a highly effective technology for producing products that must be manufactured slightly differently to meet the end-user’s requirements.
Conceptual Design of a Pilot-Scale Pyroprocessing Facility
Published in Nuclear Technology, 2019
Yoon Il Chang, Robert W. Benedict, Matthew D. Bucknor, Javier Figueroa, Joseph E. Herceg, Terry R. Johnson, Eugene R. Koehl, Richard M. Lell, Young Soo Park, Chad L. Pope, Stanley G. Wiedmeyer, Mark A. Williamson, James L. Willit, Reid James, Steve Meyers, Bryan Spaulding, John Underdahl, Mike Wolf
The TRU processor accepts the TRU/U cathode cups from the electrorefiner and collects their content for separation of the salt and metal via bottom-pour technique. The recovered salt is transferred to the salt collection tank and the metal is cast into TRU/U ingots for transfer to storage. The apparatus comprises a heated vessel and end cap. The top cover has penetrations for instrumentation, bottom-plug activation, and a heated cup receiver. The bottom of the vessel includes a tapered plug valve, capable of gravity draining the metal and then resealing.