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Air flow through poppet valves

Description: Report discusses the comparative continuous flow characteristics of single and double poppet valves. The experimental data presented affords a direct comparison of valves, single and in pairs of different sizes, tested in a cylinder designed in accordance with current practice in aviation engines.
Date: 1918
Creator: Lewis, G W & Nutting, E M
Partner: UNT Libraries Government Documents Department

Salt valve and instrumentation test using the nagle long shafted pump :final report.

Description: The Salt Valve and Instrumentation Test was done to provide data on equipment performance in high temperature environments similar to that expected in the next large scale application of that technology. The experiment tested three different valves: (1) a valve with the standard valve body and standard high temperature self-packing material; (2) a valve with the standard valve body and stainless steel O-rings; and (3) a magnetic valve that uses a high temperature coil and no packing material. The first valve, which was used at Solar Two, performed sufficiently throughout the test with only a small leak from the split-body, not the packing material, on the 6th day of testing on the long-term test. The second valve, with the stainless steel O-rings, developed a small leak on the last run of the third test at the bonnet (packing material), at which point it was noted to watch if it got worse and the test continued. By the 6th day of the long-term test, the leak was significant (up to 3 cups per day) and the test was terminated. The magnetic valve failed when exposed to a relatively low temperature of 500 F. According to the manufacturer, it was expected to survive up to temperatures of 600 F. Two different pressure transducers were tested and compared, Taylor and Dynisco. The Taylor pressure transducer was used and proven successful at Solar Two. However, they are no longer made. Therefore the experiment tested a new pressure transducer from Dynisco and compared the results to that of the Taylor. The Dynisco pressure transducer performed inaccurately from the beginning. The pressure transducer was affected by an increase in temperature when the pressure remained the same. Dynisco agreed to recalibrate the pressure transducer and/or send us a new one if the piece was faulty. However, in ...
Date: June 1, 2003
Creator: Welch, Kathleen T.
Partner: UNT Libraries Government Documents Department

HRT Process Flowsheets--Revised Edition

Description: Revised HRT flowsheets are presented. These revisions cover such items as relocation of freezer units on the lines, corrections to the numbering of lines, valves or instruments, and the addition of a few lines in the service areas. The waste and vent system flowsheet was redrawn as two sheets. (C.J.G.)
Date: December 15, 1959
Creator: Robertson, R. C. & Jones, J. E.
Partner: UNT Libraries Government Documents Department

Whitey SCHe Ball Valves Provide Test Port Isolation

Description: These valves are 1/4-inch ball valves fabricated of 316 stainless steel. Packing is TFE (standard). They are used as normally closed isolation valves for test ports in the SCHe System between the gage root valve and the pressure indicator.
Date: October 19, 2000
Creator: MISKA, C.R.
Partner: UNT Libraries Government Documents Department

Resonance Control Cooling System for the APT/LEDA RFQ

Description: The Radio Frequency Quadrupole (RFQ) resonance control cooling system (RCCS) for the Low Energy Demonstration Accelerator (LEDA) in support of the Accelerator Production of Tritium (APT) is described. Constant flow regulating valves to distribute the required flow to the 424 channels and to permit use of centrifugal pumps is discussed. Control system schema are described to regulate resonance frequency during steady state operation.
Date: November 4, 1998
Creator: Domer, G.A. & Floersch, R.H.
Partner: UNT Libraries Government Documents Department

A Methodology for Evaluation of Inservice Test Intervals for Pumps and Motor Operated Valves

Description: The nuclear industry has begun efforts to reevaluate inservice tests (ISTs) for key components such as pumps and valves. At issue are two important questions--What kinds of tests provide the most meaningful information about component health, and what periodic test intervals are appropriate? In the past, requirements for component testing were prescribed by the American Society of Mechanical Engineers (ASME) Boiler and Pressure Vessel Code. The tests and test intervals specified in the Code were generic in nature and test intervals were relatively short. Operating experience has shown, however, that performance and safety improvements and cost savings could be realized by tailoring IST programs to similar components with comparable safety importance and service conditions. In many cases, test intervals may be lengthened, resulting in cost savings for utilities and their customers.
Date: August 1, 1999
Creator: McElhaney, K.L.
Partner: UNT Libraries Government Documents Department

CRADA Final Report-Dual Manifold System for Arraying Biomolecules

Description: The objective of this CRADA is to establish a new approach to fluid transfer and array construction. This new approach will involve a high-speed, multiplexed fluid distribution valve and ink jet valves. It will enable the parallel handling of multiple reagents for a system that will have multiple applications in addition to the high-speed construction of microarrays. The primary tasks involve proof of principle experiments aimed at establishing key components of the technology and evaluating various optional configurations. The basic platform for evaluating the technology will be set-up by the Contractor at Oak Ridge National Laboratory (ORNL) and will employ custom valving prepared by Rheodyne. The test platform will consist of a motion controller, 3-axes of motion, software, and pneumatic control; and will be used to evaluate the hybrid valve.
Date: May 8, 2001
Creator: Doktycz, M.J.
Partner: UNT Libraries Government Documents Department

LLNL heart valve condition classification project anechoic testing results at the TRANSDEC evaluation facility

Description: This report first briefly outlines the procedures and support/activation fixture developed at LLNL to perform the heart valve tests in an anechoic-like tank at the US Navy Transducer Evaluation Facility (TransDec) located in San Diego, CA. Next they discuss the basic experiments performed and the corresponding experimental plan employed to gather meaningful data systematically. The signal processing required to extract the desired information is briefly developed along with some of the data. Finally, they show the results of the individual runs for each valve, point out any of the meaningful features and summaries.
Date: October 31, 1999
Creator: Candy, J V
Partner: UNT Libraries Government Documents Department

Electronic Structure and Transport in Magnetic Multilayers

Description: ORNL assisted Seagate Recording Heads Operations in the development of CIPS pin Valves for application as read sensors in hard disk drives. Personnel at ORNL were W. H. Butler and Xiaoguang Zhang. Dr. Olle Heinonen from Seagate RHO also participated. ORNL provided codes and materials parameters that were used by Seagate to model CIP GMR in their heads. The objectives were to: (1) develop a linearized Boltzmann transport code for describing CIP GMR based on realistic models of the band structure and interfaces in materials in CIP spin valves in disk drive heads; (2) calculate the materials parameters needed as inputs to the Boltzmann code; and (3) transfer the technology to Seagate Recording Heads.
Date: February 18, 2008
Partner: UNT Libraries Government Documents Department

Effect of Engineered Surfaces on Valve Performance

Description: Performance of air operated valves is a major maintenance concern in process industries. Anecdotal information indicates that reliability of some high maintenance valves has been improved by using an ion deposition process to achieve engineered surfaces on selected components. This project compared friction for various surface treatments of selected valve components. Results indicate valve performance may be slightly more consistent when an engineered surface is applied in the valve packing area; however surface treatment in this area does not appear to have a dominant affect on reducing valve friction. Results indicate a linear relation between stem friction and torque applied to packing flange nuts, and even after a valve is in service, controlled packing adjustments can be made without significantly changing valve stroke time.
Access: This item is restricted to UNT Community Members. Login required if off-campus.
Date: December 2000
Creator: Pope, Larry G.
Partner: UNT Libraries

Whitey Gauge and Root Valves (VPS)

Description: These valves are 1/2 inch ball valves fabricated of 316 stainless steel: Packing is TFE (standard). They are used as isolation valves for pressure instrumentation in the Vacuum Pumping and Helium System.
Date: September 3, 2000
Creator: MISKA, C.
Partner: UNT Libraries Government Documents Department

Whitey Gauge and Root Valves (VPS)

Description: These valves are 1/2-inch ball valves fabricated of 316 stainless steel. Packing is TFE (standard). They are used as isolation valves for pressure instrumentation in the Vacuum Pumping and Helium System.
Date: October 17, 2000
Creator: MISKA, C.
Partner: UNT Libraries Government Documents Department

Whitey SCHe Ball Valves Provide Test Port Isolation

Description: These valves are 1/4 inch ball valves fabricated of 316 stainless steel. Packing is TFE (standard). They are used as normally closed isolation valves for test ports in the SCHe System between the gage root valve and the pressure indicator.
Date: September 15, 2000
Creator: MISKA, C.R.
Partner: UNT Libraries Government Documents Department