{"id":28541,"date":"2023-05-30T08:52:22","date_gmt":"2023-05-30T06:52:22","guid":{"rendered":"https:\/\/tzbportal.sk\/?p=28541"},"modified":"2023-05-30T09:00:49","modified_gmt":"2023-05-30T07:00:49","slug":"vyber-a-uskali-navrhu-pojistneho-ventilu","status":"publish","type":"post","link":"https:\/\/tzbportal.sk\/vyber-a-uskali-navrhu-pojistneho-ventilu\/","title":{"rendered":"V\u00fdb\u011br a \u00faskal\u00ed n\u00e1vrhu pojistn\u00e9ho ventilu"},"content":{"rendered":"<p><div class=\"fusion-fullwidth fullwidth-box fusion-builder-row-1 fusion-flex-container has-pattern-background has-mask-background nonhundred-percent-fullwidth non-hundred-percent-height-scrolling\" style=\"--awb-border-radius-top-left:0px;--awb-border-radius-top-right:0px;--awb-border-radius-bottom-right:0px;--awb-border-radius-bottom-left:0px;--awb-flex-wrap:wrap;\" ><div class=\"fusion-builder-row fusion-row fusion-flex-align-items-flex-start fusion-flex-content-wrap\" style=\"max-width:1383.2px;margin-left: 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class=\"drts-bs-list-group-item drts-bs-px-0 drts-bs-border-0\">\n<div class=\"drts-entity-field\">\n<div class=\"drts-entity-field-label drts-entity-field-label-type-icon\"><i class=\"fa-fw fas fa-link \"><\/i><\/div>\n<div class=\"drts-entity-field-value\"><div data-name=\"entity_field_field_website\" class=\"drts-display-element drts-display-element-entity_field_field_website-1 drts-display-element-inlineable \" style=\"\"><a target=\"_blank\" rel=\"nofollow external noopener noreferrer\" href=\"https:\/\/www.ducotech.cz\">https:\/\/www.ducotech.cz<\/a><\/div><\/div>\n<\/div><\/div>\n<div class=\"drts-bs-list-group-item drts-bs-px-0 drts-bs-border-0\">\n<div class=\"drts-entity-field\">\n<div class=\"drts-entity-field-label drts-entity-field-label-type-icon\"><i class=\"fa-fw fas fa-at \"><\/i><\/div>\n<div class=\"drts-entity-field-value\"><div data-name=\"entity_field_field_email\" class=\"drts-display-element drts-display-element-entity_field_field_email-1 drts-display-element-inlineable \" style=\"\"><a href=\"mailto:&#111;bch&#111;&#100;&#64;&#100;ucotec&#104;.c&#122;\">&#111;bch&#111;&#100;&#64;&#100;ucotec&#104;.c&#122;<\/a><\/div><\/div>\n<\/div><\/div><\/div><\/div><\/div>\n<\/div><\/div><\/div>\n<script type=\"text\/javascript\">document.addEventListener(\"DOMContentLoaded\", function(event) { var $ = jQuery;\nDRTS.init($(\"#drts-platform-render-663725ef1d332-1\"));\n});<\/script><\/div>\n<\/div><\/div><\/div><\/div><\/div><div class=\"fusion-fullwidth fullwidth-box fusion-builder-row-2 fusion-flex-container has-pattern-background has-mask-background nonhundred-percent-fullwidth non-hundred-percent-height-scrolling\" style=\"--awb-border-radius-top-left:0px;--awb-border-radius-top-right:0px;--awb-border-radius-bottom-right:0px;--awb-border-radius-bottom-left:0px;--awb-flex-wrap:wrap;\" ><div class=\"fusion-builder-row fusion-row fusion-flex-align-items-flex-start fusion-flex-content-wrap\" style=\"max-width:1383.2px;margin-left: calc(-4% \/ 2 );margin-right: calc(-4% \/ 2 );\"><div class=\"fusion-layout-column fusion_builder_column fusion-builder-column-1 fusion_builder_column_1_1 1_1 fusion-flex-column\" style=\"--awb-bg-size:cover;--awb-width-large:100%;--awb-margin-top-large:0px;--awb-spacing-right-large:1.92%;--awb-margin-bottom-large:20px;--awb-spacing-left-large:1.92%;--awb-width-medium:100%;--awb-order-medium:0;--awb-spacing-right-medium:1.92%;--awb-spacing-left-medium:1.92%;--awb-width-small:100%;--awb-order-small:0;--awb-spacing-right-small:1.92%;--awb-spacing-left-small:1.92%;\"><div class=\"fusion-column-wrapper fusion-column-has-shadow fusion-flex-justify-content-flex-start fusion-content-layout-column\"><div class=\"fusion-text fusion-text-2\"><h2>U\u00a0teplovodn\u00edch syst\u00e9m\u016f d\u011bl\u00edme pojistn\u00e9 ventily podle pou\u017eit\u00ed na (a) pojistn\u00e9 ventily pro teplovodn\u00ed uzav\u0159en\u00e9 otopn\u00e9 soustavy a\u00a0(b) pojistn\u00e9 ventily pro syst\u00e9my oh\u0159evu tepl\u00e9 vody.<\/h2>\n<\/div><div class=\"fusion-text fusion-text-3\"><p>Parametry pojistn\u00fdch ventil\u016f pro syst\u00e9my vyt\u00e1p\u011bn\u00ed stanov\u00ed norma EN ISO 4126. Pojistn\u00e9 ventily DUCO ur\u010den\u00e9 pro tuto oblast jsou k\u00a0dispozici v\u00a0z\u00e1vitov\u00e9 verzi od \u00bd\u201c do 2\u201c s\u00a0otev\u00edrac\u00edm p\u0159etlakem od 0,5 bar do 10 bar a\u00a0v\u00a0p\u0159\u00edrubov\u00e9 verzi od DN32 do DN65 s\u00a0otev\u00edrac\u00edm p\u0159etlakem 1 bar a\u017e 10 bar. Ventily maj\u00ed \u010dernou krytku nebo \u010derven\u00fd \u0161t\u00edtek.<\/p>\n<p>Pro syst\u00e9my oh\u0159evu tepl\u00e9 vody jsou pojistn\u00e9 ventily ur\u010deny normou \u010cSN EN 1491. Pojistn\u00e9 ventily DUCO pro oh\u0159ev tepl\u00e9 vody jsou k\u00a0dispozici v\u00a0z\u00e1vitov\u00e9 verzi od \u00bd\u201c do 2\u201c s\u00a0otev\u00edrac\u00edm p\u0159etlakem od 6 bar do 10 bar. Ventily pro tepou vodu maj\u00ed modrou krytku nebo modr\u00fd \u0161t\u00edtek. Krom\u011b samostatn\u00fdch pojistn\u00fdch ventil\u016f se tak\u00e9 pou\u017e\u00edvaj\u00ed pojistn\u00e9 kombinace a\u00a0pojistn\u00e9 sestavy pro z\u00e1sobn\u00edky tepl\u00e9 vody, kter\u00e9 jsou nav\u00edc vybaveny uzav\u00edr\u00e1n\u00edm, zp\u011btnou klapkou a\u00a0z\u00e1tkou pro kontrolu spr\u00e1vn\u00e9 funkce zp\u011btn\u00e9 klapky.<\/p>\n<\/div><\/div><\/div><\/div><\/div><div class=\"fusion-fullwidth fullwidth-box fusion-builder-row-3 fusion-flex-container has-pattern-background has-mask-background nonhundred-percent-fullwidth non-hundred-percent-height-scrolling\" style=\"--awb-border-radius-top-left:0px;--awb-border-radius-top-right:0px;--awb-border-radius-bottom-right:0px;--awb-border-radius-bottom-left:0px;--awb-flex-wrap:wrap;\" ><div class=\"fusion-builder-row fusion-row fusion-flex-align-items-flex-start fusion-flex-content-wrap\" style=\"max-width:1383.2px;margin-left: calc(-4% \/ 2 );margin-right: calc(-4% \/ 2 );\"><div class=\"fusion-layout-column fusion_builder_column fusion-builder-column-2 fusion_builder_column_1_2 1_2 fusion-flex-column\" style=\"--awb-bg-size:cover;--awb-width-large:50%;--awb-margin-top-large:0px;--awb-spacing-right-large:3.84%;--awb-margin-bottom-large:20px;--awb-spacing-left-large:3.84%;--awb-width-medium:100%;--awb-order-medium:0;--awb-spacing-right-medium:1.92%;--awb-spacing-left-medium:1.92%;--awb-width-small:100%;--awb-order-small:0;--awb-spacing-right-small:1.92%;--awb-spacing-left-small:1.92%;\"><div class=\"fusion-column-wrapper fusion-column-has-shadow fusion-flex-justify-content-flex-start fusion-content-layout-column\"><div class=\"fusion-text fusion-text-4\"><p>Ve\u0161ker\u00e9 d\u00edly p\u0159ich\u00e1zej\u00edc\u00ed do styku s\u00a0vodou a\u00a0d\u00edly pod tlakem jsou u\u00a0z\u00e1vitov\u00fdch ventil\u016f z\u00a0mosazi, p\u0159\u00edrubov\u00e9 verze maj\u00ed t\u011blo litinov\u00e9. T\u011bsn\u011bn\u00ed v\u00a0oblasti sedla ventilu je vyrobeno ze silikonov\u00e9 pry\u017ee odoln\u00e9 v\u016f\u010di vysok\u00fdm teplot\u00e1m, co\u017e spolehliv\u011b zabra\u0148uje jeho p\u0159\u00edpadn\u00e9mu p\u0159ilepen\u00ed na sedlo. Odd\u011blovac\u00ed membr\u00e1ny jsou vyr\u00e1b\u011bny z\u00a0mimo\u0159\u00e1dn\u011b odoln\u00e9ho um\u011bl\u00e9ho kau\u010duku EPDM. Typickou konstrukci pojistn\u00e9ho ventilu DUCO zn\u00e1zor\u0148uje obr\u00e1zek 1.<\/p>\n<\/div><div class=\"fusion-text fusion-text-5\"><p>Kvalitu ventilu ur\u010duj\u00ed nejen pou\u017eit\u00e9 materi\u00e1ly a\u00a0zp\u016fsob jejich zpracov\u00e1n\u00ed, ale tak\u00e9 konstrukce, ovliv\u0148uj\u00edc\u00ed zejm\u00e9na zaru\u010den\u00fd v\u00fdtokov\u00fd sou\u010dinitel a<sub>w<\/sub>. Pojistn\u00e9 ventily DUCO maj\u00ed vysok\u00e9 hodnoty sou\u010dinitele a<sub>w<\/sub> a\u00a0umo\u017e\u0148uj\u00ed tak pou\u017e\u00edt men\u0161\u00ed dimenze i\u00a0pro vy\u0161\u0161\u00ed v\u00fdkony. Nap\u0159\u00edklad pojistn\u00fd ventil 2\u201c x 2 \u00bd\u201d s\u00a0otev\u00edrac\u00edm p\u0159etlakem 3 bary je schopen kr\u00fdt v\u00fdkon a\u017e 1,3 MW.<\/p>\n<\/div><\/div><\/div><div class=\"fusion-layout-column fusion_builder_column fusion-builder-column-3 fusion_builder_column_1_2 1_2 fusion-flex-column\" style=\"--awb-bg-size:cover;--awb-width-large:50%;--awb-margin-top-large:0px;--awb-spacing-right-large:3.84%;--awb-margin-bottom-large:20px;--awb-spacing-left-large:3.84%;--awb-width-medium:100%;--awb-order-medium:0;--awb-spacing-right-medium:1.92%;--awb-spacing-left-medium:1.92%;--awb-width-small:100%;--awb-order-small:0;--awb-spacing-right-small:1.92%;--awb-spacing-left-small:1.92%;\"><div class=\"fusion-column-wrapper fusion-column-has-shadow fusion-flex-justify-content-flex-start fusion-content-layout-column\"><div class=\"fusion-image-element \" style=\"--awb-liftup-border-radius:0px;--awb-caption-title-font-family:var(--h2_typography-font-family);--awb-caption-title-font-weight:var(--h2_typography-font-weight);--awb-caption-title-font-style:var(--h2_typography-font-style);--awb-caption-title-size:var(--h2_typography-font-size);--awb-caption-title-transform:var(--h2_typography-text-transform);--awb-caption-title-line-height:var(--h2_typography-line-height);--awb-caption-title-letter-spacing:var(--h2_typography-letter-spacing);\"><div class=\"awb-image-frame awb-image-frame-1 imageframe-liftup\"><span class=\" fusion-imageframe imageframe-none imageframe-1\"><img decoding=\"async\" width=\"1460\" height=\"1055\" title=\"PV_DN25_rez_popis\" src=\"https:\/\/tzbportal.sk\/wp-content\/uploads\/2023\/05\/PV_DN25_rez_popis.jpg\" alt class=\"img-responsive wp-image-28542\" srcset=\"https:\/\/tzbportal.sk\/wp-content\/uploads\/2023\/05\/PV_DN25_rez_popis-200x145.jpg 200w, https:\/\/tzbportal.sk\/wp-content\/uploads\/2023\/05\/PV_DN25_rez_popis-400x289.jpg 400w, https:\/\/tzbportal.sk\/wp-content\/uploads\/2023\/05\/PV_DN25_rez_popis-600x434.jpg 600w, https:\/\/tzbportal.sk\/wp-content\/uploads\/2023\/05\/PV_DN25_rez_popis-800x578.jpg 800w, https:\/\/tzbportal.sk\/wp-content\/uploads\/2023\/05\/PV_DN25_rez_popis-1200x867.jpg 1200w, https:\/\/tzbportal.sk\/wp-content\/uploads\/2023\/05\/PV_DN25_rez_popis.jpg 1460w\" sizes=\"(max-width: 1350px) 100vw, (max-width: 860px) 100vw, 800px\" \/><\/span><\/div><\/div><div class=\"fusion-text fusion-text-6\"><h4><em>Obr. 1\u00a0 \u0158ez pojistn\u00fdm ventilem DN25<\/em><\/h4>\n<\/div><\/div><\/div><\/div><\/div><div class=\"fusion-fullwidth fullwidth-box fusion-builder-row-4 fusion-flex-container has-pattern-background has-mask-background nonhundred-percent-fullwidth non-hundred-percent-height-scrolling\" style=\"--awb-border-radius-top-left:0px;--awb-border-radius-top-right:0px;--awb-border-radius-bottom-right:0px;--awb-border-radius-bottom-left:0px;--awb-flex-wrap:wrap;\" ><div class=\"fusion-builder-row fusion-row fusion-flex-align-items-flex-start fusion-flex-content-wrap\" style=\"max-width:1383.2px;margin-left: calc(-4% \/ 2 );margin-right: calc(-4% \/ 2 );\"><div class=\"fusion-layout-column fusion_builder_column fusion-builder-column-4 fusion_builder_column_1_1 1_1 fusion-flex-column\" style=\"--awb-bg-size:cover;--awb-width-large:100%;--awb-margin-top-large:0px;--awb-spacing-right-large:1.92%;--awb-margin-bottom-large:20px;--awb-spacing-left-large:1.92%;--awb-width-medium:100%;--awb-order-medium:0;--awb-spacing-right-medium:1.92%;--awb-spacing-left-medium:1.92%;--awb-width-small:100%;--awb-order-small:0;--awb-spacing-right-small:1.92%;--awb-spacing-left-small:1.92%;\"><div class=\"fusion-column-wrapper fusion-column-has-shadow fusion-flex-justify-content-flex-start fusion-content-layout-column\"><div class=\"fusion-text fusion-text-7\"><h2>N\u00e1vrh pojistn\u00e9ho ventilu dle \u010cSN 13 4309-3 Pr\u016fmyslov\u00e9 armatury<\/h2>\n<\/div><div class=\"fusion-text fusion-text-8\"><p><strong>Pojistn\u00e9 ventily<\/strong><\/p>\n<p>Bezchybn\u00e1 funkce pojistn\u00e9ho ventilu mus\u00ed b\u00fdt podlo\u017eena spr\u00e1vn\u00fdm n\u00e1vrhem. Krom\u011b v\u00fdpo\u010dtu pojistn\u00e9ho v\u00fdkonu, dan\u00e9ho pr\u016f\u0159ezem sedla So, zaru\u010den\u00fdm v\u00fdtokov\u00fdm sou\u010dinitelem \u013dw (viz tabulka 1) a konstantou K pro sytou vodn\u00ed p\u00e1ru p\u0159i ur\u010dit\u00e9m otev\u00edrac\u00edm p\u0159etlaku, je t\u0159eba br\u00e1t v \u00favahu tak\u00e9 charakteristiku pojistn\u00e9ho ventilu a tolerance navrhovan\u00fdch p\u0159etlak\u016f. Charakteristika pojistn\u00e9ho ventilu ur\u010duje z\u00e1vislost zdvihu ventilu a p\u0159etlaku. P\u0159i n\u00e1vrhu soustavy se b\u011b\u017en\u011b pracuje s otev\u00edrac\u00edm p\u0159etlakem ventilu, ale nesm\u00edme zapom\u00ednat ani na druh\u00fd nem\u00e9n\u011b d\u016fle\u017eit\u00fd parametr, kter\u00fdm je uzav\u00edrac\u00ed p\u0159etlak.<\/p>\n<\/div><\/div><\/div><\/div><\/div><div class=\"fusion-fullwidth fullwidth-box fusion-builder-row-5 fusion-flex-container has-pattern-background has-mask-background nonhundred-percent-fullwidth non-hundred-percent-height-scrolling\" style=\"--awb-border-radius-top-left:0px;--awb-border-radius-top-right:0px;--awb-border-radius-bottom-right:0px;--awb-border-radius-bottom-left:0px;--awb-flex-wrap:wrap;\" ><div class=\"fusion-builder-row fusion-row fusion-flex-align-items-flex-start fusion-flex-content-wrap\" style=\"max-width:1383.2px;margin-left: calc(-4% \/ 2 );margin-right: calc(-4% \/ 2 );\"><div class=\"fusion-layout-column fusion_builder_column fusion-builder-column-5 fusion_builder_column_1_2 1_2 fusion-flex-column\" style=\"--awb-bg-size:cover;--awb-width-large:50%;--awb-margin-top-large:0px;--awb-spacing-right-large:3.84%;--awb-margin-bottom-large:20px;--awb-spacing-left-large:3.84%;--awb-width-medium:100%;--awb-order-medium:0;--awb-spacing-right-medium:1.92%;--awb-spacing-left-medium:1.92%;--awb-width-small:100%;--awb-order-small:0;--awb-spacing-right-small:1.92%;--awb-spacing-left-small:1.92%;\"><div class=\"fusion-column-wrapper fusion-column-has-shadow fusion-flex-justify-content-flex-start fusion-content-layout-column\"><div class=\"fusion-image-element \" style=\"--awb-liftup-border-radius:0px;--awb-caption-title-font-family:var(--h2_typography-font-family);--awb-caption-title-font-weight:var(--h2_typography-font-weight);--awb-caption-title-font-style:var(--h2_typography-font-style);--awb-caption-title-size:var(--h2_typography-font-size);--awb-caption-title-transform:var(--h2_typography-text-transform);--awb-caption-title-line-height:var(--h2_typography-line-height);--awb-caption-title-letter-spacing:var(--h2_typography-letter-spacing);\"><div class=\"awb-image-frame awb-image-frame-2 imageframe-liftup\"><span class=\" fusion-imageframe imageframe-none imageframe-2\"><img decoding=\"async\" width=\"787\" height=\"689\" title=\"Graf-charakteristika_PV\" src=\"https:\/\/tzbportal.sk\/wp-content\/uploads\/2023\/05\/Graf-charakteristika_PV.jpg\" alt class=\"img-responsive wp-image-28544\" srcset=\"https:\/\/tzbportal.sk\/wp-content\/uploads\/2023\/05\/Graf-charakteristika_PV-200x175.jpg 200w, https:\/\/tzbportal.sk\/wp-content\/uploads\/2023\/05\/Graf-charakteristika_PV-400x350.jpg 400w, https:\/\/tzbportal.sk\/wp-content\/uploads\/2023\/05\/Graf-charakteristika_PV-600x525.jpg 600w, https:\/\/tzbportal.sk\/wp-content\/uploads\/2023\/05\/Graf-charakteristika_PV.jpg 787w\" sizes=\"(max-width: 1350px) 100vw, (max-width: 860px) 100vw, 787px\" \/><\/span><\/div><\/div><div class=\"fusion-text fusion-text-9\"><h4><em>Graf 1\u00a0 Charakteristika pojistn\u00e9ho ventilu<\/em><\/h4>\n<\/div><\/div><\/div><div class=\"fusion-layout-column fusion_builder_column fusion-builder-column-6 fusion_builder_column_1_2 1_2 fusion-flex-column\" style=\"--awb-bg-size:cover;--awb-width-large:50%;--awb-margin-top-large:0px;--awb-spacing-right-large:3.84%;--awb-margin-bottom-large:20px;--awb-spacing-left-large:3.84%;--awb-width-medium:100%;--awb-order-medium:0;--awb-spacing-right-medium:1.92%;--awb-spacing-left-medium:1.92%;--awb-width-small:100%;--awb-order-small:0;--awb-spacing-right-small:1.92%;--awb-spacing-left-small:1.92%;\"><div class=\"fusion-column-wrapper fusion-column-has-shadow fusion-flex-justify-content-flex-start fusion-content-layout-column\"><div class=\"fusion-text fusion-text-10\"><p>Graf 1 zn\u00e1zor\u0148uje jednotliv\u00e9 p\u0159etlaky ve vztahu k\u00a0charakteristice pr\u00e1ce pojistn\u00e9ho ventilu, tj. z\u00e1vislost zdvihu ventilu na p\u0159etlaku.<\/p>\n<p>p<sub>n<\/sub> \u2013 provozn\u00ed p\u0159etlak v\u00a0ji\u0161t\u011bn\u00e9m za\u0159\u00edzen\u00ed,<\/p>\n<p>p<sub>t<\/sub> \u2013 t\u011bsn\u011bn\u00fd p\u0159etlak, p\u0159i kter\u00e9m je dosa\u017eeno t\u011bsnosti pojistn\u00e9ho ventilu,<\/p>\n<p>p<sub>u<\/sub> \u2013 uzav\u00edrac\u00ed p\u0159etlak pojistn\u00e9ho ventilu,<\/p>\n<p>p<sub>o<\/sub> \u2013 otev\u00edrac\u00ed p\u0159etlak pojistn\u00e9ho ventilu,<\/p>\n<p>p<sub>max<\/sub> \u2013 p\u0159etlak p\u0159i pln\u00e9m otev\u0159en\u00ed pojistn\u00e9ho ventilu<\/p>\n<\/div><div class=\"fusion-text fusion-text-11\"><p>Rozmez\u00ed p\u0159etlaku a\u00a0zdvihu ventilu je v\u00a0bod\u011b R. P\u0159etlaky a\u00a0p\u0159\u00edpustn\u00e9 tolerance p\u0159etlak\u016f pojistn\u00fdch ventil\u016f mus\u00ed spl\u0148ovat posloupnost:<\/p>\n<p>p<sub>n<\/sub> &lt; p<sub>t<\/sub> &lt; p<sub>u<\/sub> &lt; p<sub>o<\/sub>.<\/p>\n<\/div><\/div><\/div><\/div><\/div><div class=\"fusion-fullwidth fullwidth-box fusion-builder-row-6 fusion-flex-container has-pattern-background has-mask-background nonhundred-percent-fullwidth non-hundred-percent-height-scrolling\" style=\"--awb-border-radius-top-left:0px;--awb-border-radius-top-right:0px;--awb-border-radius-bottom-right:0px;--awb-border-radius-bottom-left:0px;--awb-flex-wrap:wrap;\" ><div class=\"fusion-builder-row fusion-row fusion-flex-align-items-flex-start fusion-flex-content-wrap\" style=\"max-width:1383.2px;margin-left: calc(-4% \/ 2 );margin-right: calc(-4% \/ 2 );\"><div class=\"fusion-layout-column fusion_builder_column fusion-builder-column-7 fusion_builder_column_1_1 1_1 fusion-flex-column\" style=\"--awb-bg-size:cover;--awb-width-large:100%;--awb-margin-top-large:0px;--awb-spacing-right-large:1.92%;--awb-margin-bottom-large:20px;--awb-spacing-left-large:1.92%;--awb-width-medium:100%;--awb-order-medium:0;--awb-spacing-right-medium:1.92%;--awb-spacing-left-medium:1.92%;--awb-width-small:100%;--awb-order-small:0;--awb-spacing-right-small:1.92%;--awb-spacing-left-small:1.92%;\"><div class=\"fusion-column-wrapper fusion-column-has-shadow fusion-flex-justify-content-flex-start fusion-content-layout-column\"><div class=\"fusion-text fusion-text-12\"><p>P\u0159\u00edpustn\u00e9 tlakov\u00e9 rozd\u00edly jednotliv\u00fdch p\u0159etlak\u016f u\u00a0pojistn\u00fdch ventil\u016f pro teplovodn\u00ed soustavy dle \u010cSN 13 4309-3:<\/p>\n<p>p<sub>max<\/sub> \u2013 p<sub>o<\/sub> mus\u00ed b\u00fdt \u2264 10 % nebo \u2264 15 kPa pro ventily s\u00a0p<sub>o<\/sub> \u2264 150 kPa,<\/p>\n<p>p<sub>o<\/sub> \u2013 p<sub>u<\/sub> mus\u00ed b\u00fdt u\u00a0ventil\u016f pro p\u00e1ru \u2264 15 % nebo \u2264 30 kPa pro ventily s\u00a0p<sub>o<\/sub> \u2264 300 kPa,<\/p>\n<p>p<sub>o<\/sub> \u2013 p<sub>u<\/sub> mus\u00ed b\u00fdt u\u00a0ventil\u016f pro vodu \u2264 20 % nebo \u2264 60 kPa pro ventily s\u00a0p<sub>o<\/sub> \u2264 300 kPa.<\/p>\n<p>Uv\u00e1d\u00ed-li se u\u00a0po\u017eadavku procenta, je tato hodnota po\u010d\u00edt\u00e1na z\u00a0otev\u00edrac\u00edho p\u0159etlaku.<\/p>\n<p>Z\u00a0dan\u00fdch toleranc\u00ed vypl\u00fdvaj\u00ed dv\u011b podm\u00ednky:<\/p>\n<ol>\n<li>Pro pracovn\u00ed p\u0159etlak v\u00a0ji\u0161t\u011bn\u00e9m za\u0159\u00edzen\u00ed p<sub>n<\/sub> plat\u00ed p<sub>n<\/sub> &lt; p<sub>u<\/sub>. P\u0159i nespln\u011bn\u00ed t\u00e9to podm\u00ednky pojistn\u00fd ventil nen\u00ed schopen zcela uzav\u0159\u00edt.<\/li>\n<li>Pokud p\u0159i dimenzov\u00e1n\u00ed pojistn\u00e9ho ventilu vych\u00e1z\u00edme z\u00a0otev\u00edrac\u00edho p\u0159etlaku p<sub>o<\/sub>, bude dosa\u017eeno v\u00fdpo\u010dtov\u00e9ho v\u00fdkonu a\u017e p\u0159i p\u0159etlaku p\u0159i pln\u00e9m otev\u0159en\u00ed p<sub>max<\/sub>, tzn. p\u0159i p\u0159etlaku o\u00a010 % vy\u0161\u0161\u00edm, ne\u017e je hodnota otev\u00edrac\u00edho p\u0159etlaku p<sub>o<\/sub>.<\/li>\n<\/ol>\n<\/div><div class=\"fusion-text fusion-text-13\"><p><em>P\u0159\u00edklad:<\/em><\/p>\n<p>Pojistn\u00fd ventil ur\u010den\u00fd pro teplovodn\u00ed otopnou soustavu s\u00a0otev\u00edrac\u00edm p\u0159etlakem p<sub>O<\/sub> = 400 kPa bude m\u00edt zaru\u010den\u00fd uzav\u00edrac\u00ed p\u0159etlak p<sub>u<\/sub> \u2265 400 \u2013 80 = 320 kPa, proto\u017ee tlakov\u00fd rozd\u00edl je 0,20 . 400 = 80 kPa. Nejvy\u0161\u0161\u00ed provozn\u00ed p\u0159etlak P<sub>n<\/sub> za\u0159\u00edzen\u00ed by potom p\u0159i spr\u00e1vn\u00e9m n\u00e1vrhu nem\u011bl p\u0159ekro\u010dit 320 kPa. K\u00a0pln\u00e9mu otev\u0159en\u00ed ventilu dojde s\u00a0jistotou a\u017e p\u0159i p\u0159etlaku P<sub>max<\/sub> \u2265 400 + 40 = 440 kPa.<\/p>\n<p>Pokud je chybn\u011b zvolen provozn\u00ed p\u0159etlak soustavy vy\u0161\u0161\u00ed, ne\u017e je uzav\u00edrac\u00ed p\u0159etlak pojistn\u00e9ho ventilu, m\u016f\u017ee doch\u00e1zet k\u00a0tzv. podt\u00e9k\u00e1n\u00ed pojistn\u00e9ho ventilu, kter\u00e9 je \u010dasto chybn\u011b pova\u017eov\u00e1no za vadu ventilu nebo za symptom p\u0159\u00edtomnosti ne\u010distot v\u00a0sedle ventilu.<\/p>\n<p>Volba pojistn\u00e9ho ventilu tedy mus\u00ed br\u00e1t v\u00a0\u00favahu v\u00edce d\u016fle\u017eit\u00fdch podm\u00ednek a\u00a0teprve jejich spr\u00e1vn\u00e9 vyhodnocen\u00ed povede ke spolehliv\u00e9mu ji\u0161t\u011bn\u00ed otopn\u00e9 soustavy.<\/p>\n<\/div><div class=\"fusion-text fusion-text-14\"><h4><em>Tabulka 1\u00a0 \u00dadaje pro v\u00fdpo\u010det podle \u010cSN 13 4309-3 Pr\u016fmyslov\u00e9 armatury. Pojistn\u00e9 ventily. \u010c\u00e1st 3: v\u00fdpo\u010det v\u00fdtok\u016f.<\/em><\/h4>\n<\/div><div class=\"fusion-image-element \" style=\"--awb-liftup-border-radius:0px;--awb-caption-title-font-family:var(--h2_typography-font-family);--awb-caption-title-font-weight:var(--h2_typography-font-weight);--awb-caption-title-font-style:var(--h2_typography-font-style);--awb-caption-title-size:var(--h2_typography-font-size);--awb-caption-title-transform:var(--h2_typography-text-transform);--awb-caption-title-line-height:var(--h2_typography-line-height);--awb-caption-title-letter-spacing:var(--h2_typography-letter-spacing);\"><div class=\"awb-image-frame awb-image-frame-3 imageframe-liftup\"><span class=\" fusion-imageframe imageframe-none imageframe-3\"><img decoding=\"async\" width=\"1772\" height=\"1266\" title=\"tab1\" src=\"https:\/\/tzbportal.sk\/wp-content\/uploads\/2023\/05\/tab1-1.jpg\" alt class=\"img-responsive wp-image-28546\" srcset=\"https:\/\/tzbportal.sk\/wp-content\/uploads\/2023\/05\/tab1-1-200x143.jpg 200w, https:\/\/tzbportal.sk\/wp-content\/uploads\/2023\/05\/tab1-1-400x286.jpg 400w, https:\/\/tzbportal.sk\/wp-content\/uploads\/2023\/05\/tab1-1-600x429.jpg 600w, https:\/\/tzbportal.sk\/wp-content\/uploads\/2023\/05\/tab1-1-800x572.jpg 800w, https:\/\/tzbportal.sk\/wp-content\/uploads\/2023\/05\/tab1-1-1200x857.jpg 1200w, https:\/\/tzbportal.sk\/wp-content\/uploads\/2023\/05\/tab1-1.jpg 1772w\" sizes=\"(max-width: 1350px) 100vw, (max-width: 860px) 100vw, 1772px\" \/><\/span><\/div><\/div><\/div><\/div><\/div><\/div><\/p>\n","protected":false},"excerpt":{"rendered":"<p>U\u00a0teplovodn\u00edch syst\u00e9m\u016f d\u011bl\u00edme pojistn\u00e9 ventily podle pou\u017eit\u00ed na (a) pojistn\u00e9 ventily pro teplovodn\u00ed uzav\u0159en\u00e9 otopn\u00e9 soustavy a\u00a0(b) pojistn\u00e9 ventily pro syst\u00e9my oh\u0159evu tepl\u00e9 vody.<\/p>\n","protected":false},"author":17,"featured_media":28548,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[2,30,76],"tags":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v21.5 - 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