{"id":4144,"date":"2026-02-14T09:00:00","date_gmt":"2026-02-14T09:00:00","guid":{"rendered":"https:\/\/www.desopipe.com\/?p=4144"},"modified":"2026-03-06T08:02:51","modified_gmt":"2026-03-06T08:02:51","slug":"pn25-ppr-valves-for-solar-heating","status":"publish","type":"post","link":"https:\/\/www.desopipe.com\/it\/blog\/ppr-valve\/pn25-ppr-valves-for-solar-heating\/","title":{"rendered":"Soluzioni ad alta pressione: quando specificare valvole PPR PN25 negli impianti di riscaldamento solare"},"content":{"rendered":"<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_86 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Sommario<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Attiva\/disattiva la tabella dei contenuti\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Attiva\/disattiva<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewbox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewbox=\"0 0 24 24\" version=\"1.2\" baseprofile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 eztoc-toggle-hide-by-default' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/www.desopipe.com\/it\/blog\/ppr-valve\/pn25-ppr-valves-for-solar-heating\/#Pressure_Temperature_in_Solar_Heating_Systems\" >Pressione e temperatura nei sistemi di riscaldamento solare<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/www.desopipe.com\/it\/blog\/ppr-valve\/pn25-ppr-valves-for-solar-heating\/#What_is_the_Difference_Between_a_PN20_and_a_PN_25_Valve\" >Qual \u00e8 la differenza tra una valvola PN20 e una PN25?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/www.desopipe.com\/it\/blog\/ppr-valve\/pn25-ppr-valves-for-solar-heating\/#Failure_Risks_of_Under-Specification\" >Rischi di guasto dovuti a specifiche insufficienti<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/www.desopipe.com\/it\/blog\/ppr-valve\/pn25-ppr-valves-for-solar-heating\/#Selecting_Valves_for_Long-Term_Stability\" >Selezione delle valvole per la stabilit\u00e0 a lungo termine<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/www.desopipe.com\/it\/blog\/ppr-valve\/pn25-ppr-valves-for-solar-heating\/#DESO_High-Pressure_Valve_Solutions\" >Soluzioni per valvole ad alta pressione DESO<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/www.desopipe.com\/it\/blog\/ppr-valve\/pn25-ppr-valves-for-solar-heating\/#Conclusion\" >Conclusione<\/a><\/li><\/ul><\/nav><\/div>\n\n<p class=\"wp-block-paragraph\">Nel moderno settore idraulico, i sistemi in PPR sono il materiale standard per gli impianti idraulici di acqua calda e fredda. Questo standard deve essere supportato dalla conformit\u00e0 internazionale, tra cui ISO9001 per la gestione della qualit\u00e0 e <a href=\"https:\/\/www.desopipe.com\/it\/certificate\/\" target=\"_blank\" rel=\"noreferrer noopener\">Norme DIN 8077\/8078<\/a>. Ci\u00f2 garantisce che ogni tubo e <strong>valvola PPR<\/strong> soddisfa le specifiche di resistenza alla pressione e stabilit\u00e0 termica a lungo termine.&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Tuttavia, non tutti i tubi in PPR (polipropilene copolimero random) possono resistere ad alte temperature. Ecco perch\u00e9 \u00e8 necessario controllare la classificazione &quot;PN&quot; per determinare se il tubo o la valvola sono in grado di gestire l&#039;intervallo di temperature.&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">UN <strong>Valvola PN 25<\/strong> \u00e8 la valvola &quot;pesante&quot; ed \u00e8 classificata per 25 bar di pressione (circa 362 psi). \u00c8 possibile utilizzare una valvola standard PN16 o PN20 per un lavello da cucina standard. Tuttavia, se l&#039;impianto idraulico \u00e8 sottoposto a forti sollecitazioni, sono necessarie valvole con classificazione PN25. In questo articolo, imparerai come scegliere la valvola giusta per i tuoi impianti solari termici.&nbsp;<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Pressure_Temperature_in_Solar_Heating_Systems\"><\/span>Pressione e temperatura nei sistemi di riscaldamento solare<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">I collettori solari sono dispositivi installati insieme agli impianti solari termici. Catturano e raccolgono la luce solare e la convertono in energia utilizzabile. Sono spesso installati in condomini di grandi dimensioni e raggiungono temperature massime di 80 \u00b0C (176 \u00b0F). Pertanto, un <strong>Valvola di riscaldamento PPR<\/strong> in un circuito solare deve gestire un fluido che oscilla tra la temperatura ambiente e i punti prossimi all&#039;ebollizione.&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Durante interruzioni di corrente o guasti alla pompa in giornate estremamente calde, il sistema potrebbe raggiungere la stagnazione. Ci\u00f2 pu\u00f2 causare un rapido aumento della pressione interna dovuto all&#039;espansione del fluido. <strong>valvola PPR<\/strong> potrebbe usurarsi se il <a href=\"https:\/\/www.desopipe.com\/it\/blog\/ppr-pipe\/ppr-pipe-wall-thickness-sdr-vs-pn\/\" target=\"_blank\" rel=\"noreferrer noopener\">Valutazione PN<\/a> non \u00e8 in grado di gestire i picchi di espansione termica. Inoltre, la capacit\u00e0 di sopportare la pressione del PPR diminuisce all&#039;aumentare della temperatura di esercizio.&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Quindi, selezionando un <strong>valvola PPR ad alta temperatura<\/strong> con il giusto valore PN dovrebbe aiutare a mantenere un margine di sicurezza a 70\u00b0C o 95\u00b0C. A questo punto, una valvola da 25 bar \u00e8 la scelta standard per il tuo impianto di riscaldamento solare.&nbsp;<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"What_is_the_Difference_Between_a_PN20_and_a_PN_25_Valve\"><\/span>Qual \u00e8 la differenza tra una valvola PN20 e una PN25?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">La differenza principale tra le classificazioni delle valvole PN25 e PN 20 risiede in <a href=\"https:\/\/www.desopipe.com\/it\/blog\/ppr-pipe\/ppr-pipe-wall-thickness-sdr-vs-pn\/\" target=\"_blank\" rel=\"noreferrer noopener\">spessore della parete<\/a> e grado specifico delle materie prime. A PN20 <strong>valvola PPR<\/strong> \u00e8 progettato per una pressione normale di 2,0 MPa (20 bar) a 20\u00b0C. D&#039;altro canto, un&#039;unit\u00e0 con pressione nominale di 25 bar \u00e8 progettata per 2,5 MPa (25 bar).&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Per applicazioni solari, un PN 25<strong> <\/strong>fornisce pareti strutturali pi\u00f9 spesse. Queste pareti resistono alla lenta deformazione della plastica sottoposta a calore e stress costanti. Anche quando il sistema funziona ai limiti termici pi\u00f9 elevati, <strong>valvola PPR ad alta temperatura<\/strong> rimane a tenuta stagna nei giunti di fusione. Ci\u00f2 \u00e8 dovuto alla maggiore densit\u00e0 del materiale della valvola.&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Di seguito \u00e8 riportata una tabella che illustra le differenze e le applicazioni:<\/p>\n\n\n\n<figure class=\"wp-block-table is-style-stripes\"><table class=\"has-fixed-layout\"><tbody><tr><td><strong>Scenario applicativo<\/strong><\/td><td><strong>Fattori di stress tipici<\/strong><\/td><td><strong>Prestazioni della valvola PPR PN20<\/strong><\/td><td><strong>Prestazioni della valvola PPR PN25 (alta pressione)<\/strong><\/td><\/tr><tr><td>Torri residenziali di grandi dimensioni<\/td><td>Pressione statica + colpo d&#039;ariete (sovratensioni)<\/td><td>Funziona in prossimit\u00e0 dei limiti strutturali; soggetto ad affaticamento dovuto agli urti all&#039;avvio della pompa.<\/td><td>Fornisce un \u201cmargine\u201d meccanico per assorbire i picchi di pressione senza sollecitare la parete.<\/td><\/tr><tr><td>Stagnazione solare commerciale<\/td><td>Calore estremo (90\u00b0C+) + Espansione del fluido<\/td><td>Si verifica un significativo \u201cdeclassamento\u201d; il materiale si ammorbidisce e pu\u00f2 rompersi sotto la pressione del vapore.<\/td><td>Mantiene una maggiore capacit\u00e0 di pressione alle temperature di picco grazie alla maggiore densit\u00e0 della parete.<\/td><\/tr><tr><td>Riscaldamento di processo industriale<\/td><td>Carico termico costante (75\u00b0C+) + funzionamento 24 ore su 24, 7 giorni su 7<\/td><td>Sensibile alla rottura per scorrimento; le molecole si &quot;allungano&quot; nel tempo, causando perdite.<\/td><td>L&#039;SDR (rapporto dimensionale standard) pi\u00f9 spesso resiste alla deformazione molecolare per una stabilit\u00e0 a lungo termine.<\/td><\/tr><tr><td>Stazioni di pompaggio del teleriscaldamento<\/td><td>Vibrazione meccanica ad alta frequenza<\/td><td>Pareti pi\u00f9 sottili possono causare distorsioni della sede e perdite di bypass interne.<\/td><td>Il corpo rinforzato funge da smorzatore di vibrazioni, mantenendo un perfetto allineamento interno.<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Failure_Risks_of_Under-Specification\"><\/span>Rischi di guasto dovuti a specifiche insufficienti<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Quando si selezionano le valvole per un circuito solare ad alta pressione, \u00e8 importante scegliere la valvola consigliata con il corretto valore nominale (PN). L&#039;utilizzo di una valvola con un valore nominale inferiore comporta diversi rischi industriali, tra cui:&nbsp;<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Rottura da scorrimento:<\/strong> Sulle valvole si formano microfratture che riducono la durata del materiale. Questo \u00e8 causato dall&#039;esposizione prolungata a calore elevato.&nbsp;<\/li>\n\n\n\n<li><strong>Debolezza articolare:<\/strong> L&#039;esposizione prolungata al calore provoca anche l&#039;espansione termica. Quando questo ciclo si ripete, si crea un&#039;enorme sollecitazione sul legame di fusione tra il tubo e il <strong>Valvola di riscaldamento PPR.&nbsp;<\/strong><\/li>\n\n\n\n<li><strong>Tempo di inattivit\u00e0 del sistema: <\/strong>Perdite di fluido e danni al collettore sono spesso causati da valvole con specifiche insufficienti. Questi sono spesso i punti di guasto pi\u00f9 comuni.&nbsp;<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Gli ingegneri possono prevedere una tolleranza di sicurezza per questi comuni punti critici del settore. Specificare una valvola da 25 bar<strong> <\/strong>garantisce che il sistema duri pi\u00f9 di 25 anni.&nbsp;<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Selecting_Valves_for_Long-Term_Stability\"><\/span>Selezione delle valvole per la stabilit\u00e0 a lungo termine<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Gli ingegneri devono verificare la conformit\u00e0 agli standard internazionali come DIN 8077\/8078 o ISO 15874. Questo \u00e8 un requisito rigoroso quando si sceglie un <strong>Valvola di riscaldamento PPR.<\/strong> Questi standard definiscono le specifiche richieste, quali dimensioni e prove di pressione.&nbsp;&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">UN <strong>valvola PPR ad alta temperatura<\/strong> deve gestire lo specifico <a href=\"https:\/\/www.desopipe.com\/it\/blog\/ppr-pipe\/ppr-pipe-sizes-and-specifications-guide-for-buyer\/\" target=\"_blank\" rel=\"noreferrer noopener\">SDR (rapporto dimensionale standard)<\/a> del sistema di tubazioni. Una stabile <strong>valvola PPR<\/strong> Dovrebbero inoltre essere dotati di inserti in lega di ottone CW617N per connessioni filettate. Ci\u00f2 previene la corrosione galvanica e garantisce un accoppiamento meccanico sicuro con i collettori metallici.&nbsp;<\/p>\n\n\n\n<!DOCTYPE html>\n<html lang=\"en\">\n<head>\n  \n  <title>Prodotto in evidenza<\/title>\n  <style>\n    .hero-card {\n      display: flex;\n      flex-wrap: wrap;\n      align-items: center;\n      background: #f7f8fa;\n      border-radius: 16px;\n      box-shadow: 0 6px 20px rgba(0, 0, 0, 0.05);\n      padding: 24px;\n      max-width: 900px;\n      margin: 40px auto;\n      font-family: Arial, sans-serif;\n      text-decoration: none;\n      color: inherit;\n font-family: 'Poppins';\n    }\n\n    .hero-image {\n      width: 220px;\n      height: auto;\n      border-radius: 12px;\n      object-fit: cover;\n      flex-shrink: 0;\n    }\n\n    .hero-content {\n      padding-left: 24px;\n      flex: 1;\n      min-width: 260px;\n    }\n\n    .hero-title {\n      font-size: 1.6rem;\n      font-weight: bold;\n      margin-bottom: 12px;\n      color: #222;\n      font-family: 'Poppins',\n    }\n\n    .hero-description {\n      font-size: 1rem;\n      color: #555;\n      margin-bottom: 18px;\n    }\n\n    .hero-link {\n      display: inline-block;\n      padding: 10px 20px;\n      background-color: #0066cc;\n      color: #fff;\n      text-decoration: none;\n      border-radius: 8px;\n      font-weight: bold;\n      transition: background 0.2s ease-in-out;\n    }\n\n    .hero-link:hover {\n      background-color: #004c99;\n    }\n\n    @media (max-width: 640px) {\n      .hero-card {\n        flex-direction: column;\n        text-align: center;\n      }\n\n      .hero-content {\n        padding-left: 0;\n        padding-top: 20px;\n      }\n\n      .hero-image {\n        width: 100%;\n        max-width: 280px;\n      }\n    }\n  <\/style>\n<\/head>\n<body>\n\n<a class=\"hero-card\" href=\"https:\/\/www.desopipe.com\/it\/product\/plastic-ball-valve-with-brass-core-ii\/\" target=\"_blank\">\n  <img decoding=\"async\" class=\"hero-image\" src=\"https:\/\/www.desopipe.com\/wp-content\/uploads\/2025\/03\/Plastic-ball-valve-with-brass-core-II.jpg\" alt=\"\">\n  <div class=\"hero-content\">\n    <div class=\"hero-title\">Valvola a sfera in plastica con anima in ottone II<\/div>\n    <div class=\"hero-description\">\nIntervallo di dimensioni: DN20\u2013DN32 (20 mm\u201363 mm).<br>\n\nPressione nominale: PN25 (fino a 2,5 MPa).\n\n <\/div>\n    <span class=\"hero-link\">Visualizza prodotto<\/span>\n  <\/div>\n<\/a>\n\n<\/body>\n<\/html>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"DESO_High-Pressure_Valve_Solutions\"><\/span>Soluzioni per valvole ad alta pressione DESO<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">DESO, uno dei produttori di tubi in PPR, \u00e8 specializzato nella produzione di tubi rinforzati <strong>Valvola PN 25<\/strong> unit\u00e0. Le nostre <strong>valvola PPR ad alta temperatura<\/strong> La linea \u00e8 specificamente realizzata per applicazioni solari termiche. Utilizzano 100% Borealis o Hyosung <a href=\"https:\/\/www.desopipe.com\/it\/blog\/manufacturer\/buyers-guide-to-high-quality-ppr-pipe-material\/\" target=\"_blank\" rel=\"noreferrer noopener\">materie prime<\/a> per garantire la stabilit\u00e0 chimica.&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">IL <strong>Valvola di riscaldamento PPR<\/strong> viene testato a 95 \u00b0C per 1.000 ore. Questo ne verifica la resistenza al degrado termico secondo la norma ISO 15874, clausola 11.2 (o simili). Gli installatori mirano a fornire ai clienti residenziali o commerciali un sistema con certificazione per il funzionamento a 25 bar. Soddisfacendo questi requisiti, si eliminano i richiami e le rilavorazioni.&nbsp;<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Conclusion\"><\/span>Conclusione<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Scegliere un <strong>Valvola PN 25<\/strong> \u00e8 una misura proattiva per garantire la sicurezza e l&#039;efficienza di un impianto di riscaldamento solare. Gli ingegneri devono specificare le valvole corrette in base ai requisiti dell&#039;impianto idraulico. Sebbene uno standard <strong>valvola PPR <\/strong>potrebbe essere sufficiente per l&#039;impianto idraulico standard, le esigenze termiche di un sistema di riscaldamento solare richiedono una valvola pi\u00f9 durevole. Installando la corretta <strong>Valvola di riscaldamento PPR, <\/strong>puoi essere certo della sicurezza del sistema, dell&#039;efficienza e di una durata di servizio certificata di 25 anni.<\/p>\n\n\n\n<div class=\"wp-block-buttons is-content-justification-center is-layout-flex wp-container-core-buttons-is-layout-fe48e5de wp-block-buttons-is-layout-flex\">\n<div class=\"wp-block-button\"><a class=\"wp-block-button__link has-white-color has-text-color has-background has-link-color wp-element-button\" href=\"https:\/\/www.desopipe.com\/it\/contact\/\" style=\"background-color:#0588a7\" target=\"_blank\" rel=\"noreferrer noopener\">Richiedi un preventivo gratuito<\/a><\/div>\n<\/div>","protected":false},"excerpt":{"rendered":"<p>In the modern plumbing industry, PPR systems are the standard material for hot and cold water plumbing. This standard must be backed by international compliance, including<span class=\"excerpt-hellip\"> [\u2026]<\/span><\/p>\n","protected":false},"author":1,"featured_media":4245,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[58],"tags":[],"class_list":["post-4144","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-ppr-valve"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.2 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>PPR Valve PN25 for High-Pressure Solar Heating | DESO Group<\/title>\n<meta name=\"description\" content=\"Learn why a high temperature PPR valve is required for solar heating and why a PN 25 valve is required to ensure thermal stability, creep rupture resistance, and a 25-year system service life.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, 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