{"id":{"repo_id":"unt","oai_identifier":"info:ark/67531/metadc2670"},"canonical_url":"https://search.dev.ndltd.org/etd/unt/info:ark/67531/metadc2670","repository":{"repo_id":"unt","name":"University of North Texas","base_url":"https://digital.library.unt.edu/oai/"},"display":{"title":"Effect of Engineered Surfaces on Valve Performance","abstract":"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.","abstract_html":"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.","abstract_has_math":false,"creators":["Pope, Larry G."],"institution":"University of North Texas","degree_name":null,"degree_level":null,"degree_discipline":null,"degree_department":null,"school":null,"contributors":["Plummer, Mitty C.","Foster, Phillip R.","Johnson, J. Lynn","Hopkins, Daniel N.","Grubbs, Albert B."],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2000,"date_issued":"2000-12","date_published":"2000-12","updated_at":"2026-07-24T05:34:52Z","subjects":["Valves.","Metals -- Surfaces.","process industries","valves","Ion deposition","stem friction","Ion plating"],"languages":["English"],"rights":["Use restricted to UNT Community","Copyright","Pope, Larry G.","Copyright is held by the author, unless otherwise noted. All rights reserved."],"rights_urls":[],"identifier_entries":[{"key":"dc:identifier","label":"Identifier","values":["oclc: 50547302","https://digital.library.unt.edu/ark:/67531/metadc2670/","ark: ark:/67531/metadc2670"],"render_values":[{"text":"oclc: 50547302","href":null,"code":true},{"text":"https://digital.library.unt.edu/ark:/67531/metadc2670/","href":"https://digital.library.unt.edu/ark:/67531/metadc2670/","code":true},{"text":"ark: ark:/67531/metadc2670","href":null,"code":true}]}]},"links":{"outbound_url":"https://doi.org/10.12794/metadc2670","outbound_label":"DOI","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Plummer, Mitty C.","Foster, Phillip R.","Johnson, J. 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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."]},{"key":"dc:format","label":"Dc Format","values":["Text"]},{"key":"dc:title","label":"Title","values":["Effect of Engineered Surfaces on Valve Performance"]}]}],"canonical_facts":{"dc:contributor":["Plummer, Mitty C.","Foster, Phillip R.","Johnson, J. Lynn","Hopkins, Daniel N.","Grubbs, Albert B."],"dc:creator":["Pope, Larry G."],"dc:date":["2000-12"],"dc: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."],"dc:format":["Text"],"dc:identifier":["oclc: 50547302","doi: 10.12794/metadc2670","https://digital.library.unt.edu/ark:/67531/metadc2670/","ark: ark:/67531/metadc2670"],"dc:language":["English"],"dc:publisher":["University of North Texas"],"dc:rights":["Use restricted to UNT Community","Copyright","Pope, Larry G.","Copyright is held by the author, unless otherwise noted. All rights reserved."],"dc:subject":["Valves.","Metals -- Surfaces.","process industries","valves","Ion deposition","stem friction","Ion plating"],"dc:title":["Effect of Engineered Surfaces on Valve Performance"],"dc:type":["Thesis or Dissertation"]},"updated_at":"2026-07-24T05:34:52Z"}