{"id":3807,"date":"2015-01-23T17:00:46","date_gmt":"2015-01-23T16:00:46","guid":{"rendered":"http:\/\/astonseals.it\/?page_id=3807"},"modified":"2015-07-27T16:34:00","modified_gmt":"2015-07-27T14:34:00","slug":"introduction","status":"publish","type":"page","link":"https:\/\/astonseals.com\/en\/support\/introduction\/","title":{"rendered":"Introduction"},"content":{"rendered":"<p>The demand of seals for hydraulic cylinders is to prevent the flow of fluid across two surfaces in relative movement and to maintain a high level of sealing performance during their service life under the operating conditions for which they have been chosen.<br \/>\nDuring the movement a drag flow develops through the sliding motion and, as consequence of a hydrodynamic growth of pressure, the seal is lifted off the sliding surface and a thin film of fluid remains between the seal and the sliding surface. The thickness of this film of fluid is regulated by the following formula:<\/p>\n<p style=\"text-align: center;\"><strong>s = K \u2219 \u221a(\u00b5VL\/P)<\/strong><\/p>\n<p>where<\/p>\n<ul>\n<li>s = thickness of the film of fluid<img loading=\"lazy\" class=\"alignright size-full wp-image-2561\" src=\"http:\/\/astonseals.com\/wp-content\/uploads\/2014\/03\/meccanica_elementi_tenuta_300.png\" alt=\"meccanica_elementi_tenuta_300\" width=\"300\" height=\"200\" \/><\/li>\n<\/ul>\n<ul>\n<li>K = coefficient (\u2248 2,3)<\/li>\n<\/ul>\n<ul>\n<li>\u00b5 = fluid viscosity<\/li>\n<\/ul>\n<ul>\n<li>V = speed<\/li>\n<\/ul>\n<ul>\n<li>L = length of the surfaces in relative movement<\/li>\n<\/ul>\n<ul>\n<li>P = pressure<\/li>\n<\/ul>\n<p>Since the thickness of this film is the amount of fluid that goes through the seal during the movement, it can be considered within certain limits as something equivalent to a leakage.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>The demand of seals for hydraulic cylinders is to prevent the flow of fluid across two surfaces in relative movement and to maintain a high level of sealing performance during their service life under the operating conditions for which they have been chosen. During the movement a drag flow develops through the sliding motion and,&hellip;<\/p>\n","protected":false},"author":4,"featured_media":0,"parent":3798,"menu_order":21,"comment_status":"closed","ping_status":"open","template":"","meta":[],"_links":{"self":[{"href":"https:\/\/astonseals.com\/en\/wp-json\/wp\/v2\/pages\/3807"}],"collection":[{"href":"https:\/\/astonseals.com\/en\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/astonseals.com\/en\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/astonseals.com\/en\/wp-json\/wp\/v2\/users\/4"}],"replies":[{"embeddable":true,"href":"https:\/\/astonseals.com\/en\/wp-json\/wp\/v2\/comments?post=3807"}],"version-history":[{"count":1,"href":"https:\/\/astonseals.com\/en\/wp-json\/wp\/v2\/pages\/3807\/revisions"}],"predecessor-version":[{"id":3808,"href":"https:\/\/astonseals.com\/en\/wp-json\/wp\/v2\/pages\/3807\/revisions\/3808"}],"up":[{"embeddable":true,"href":"https:\/\/astonseals.com\/en\/wp-json\/wp\/v2\/pages\/3798"}],"wp:attachment":[{"href":"https:\/\/astonseals.com\/en\/wp-json\/wp\/v2\/media?parent=3807"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}