{"id":129291,"date":"2025-10-06T20:55:28","date_gmt":"2025-10-06T20:55:28","guid":{"rendered":"https:\/\/produse.valrom.ro\/product\/teava-valduotherm-gri-ppr-d-32x44mm-sdr74-l4m\/"},"modified":"2026-03-31T16:27:51","modified_gmt":"2026-03-31T16:27:51","slug":"teava-valduotherm-gri-ppr-d-32x44mm-sdr74-l4m","status":"publish","type":"product","link":"https:\/\/produse.valrom.ro\/en\/product\/teava-valduotherm-gri-ppr-d-32x44mm-sdr74-l4m\/","title":{"rendered":"VALDuotherm GREY PPR PIPE D. 32×4.4mm SDR 7.4 L 4m"},"content":{"rendered":"
\t <\/div>\n
For indoor cold and hot water supply installations, as follows:<\/div>\n
\t <\/div>\n
\t  – Class 1 (hot water 60\u00b0C) – design temperature for service life: 60\u00b0C\/49 years + 80\u00b0C\/1 year + 95\u00b0C\/100 hours;<\/div>\n
\t  – Class 2 (hot water 70\u00b0C) – design temperature for service life: 70\u00b0C\/49 years + 80\u00b0C\/1 year + 95\u00b0C\/100 hours; <\/div>\n
\t INSTALLATION<\/div>\n
\t For PP-R pipes not installed embedded in a protective conduit (where expansion occurs within the conduit)<\/div>\n
\t and for large diameter pipes, measures for expansion compensation must be taken from the design phase.<\/div>\n
\t PPR pipes have the following expansion coefficient: <\/div>\n
\t  \u2022 PP-R \u03b1 = 0.15 mm\/m K,<\/div>\n
\t  \u2022 PP-R\/FIBER \u03b1 = 0.088 mm\/m K<\/div>\n
\t  \u2022 PP-R\/Al \u03b1 = 0.03 mm\/m K.<\/div>\n
\t For exposed installation, it is necessary to secure the system to prevent uncontrolled pipe movement.<\/div>\n
\t Linear expansion is compensated between two fixed points. The fixed points of the system are positioned near branches, valves, or wall penetrations. <\/div>\n
\t The fixed points of the system are positioned near branches, valves, or wall penetrations.<\/div>\n
\t Fixed points are placed so that expansion forces<\/div>\n
\t The variation in pipe length depending on pipe length and temperature variation is calculated<\/div>\n
\t using the following formula:<\/div>\n
\t  \u0394L = \u03b1 x \u0394T x L \u0394L = L-Lo<\/div>\n
\t  \u0394T = T – To<\/div>\n
\t where:<\/div>\n
\t  \u0394L = total pipe length variation [mm]<\/div>\n
\t  \u0394T = total temperature variation<\/div>\n
\t  \u03b1 = linear expansion coefficient, [mm\/m K]<\/div>\n
\t  T = operating temperature<\/div>\n
\t  To = installation temperature<\/div>\n
\t  L = pipe length at temperature T, [m]<\/div>\n
\t  Lo = pipe length at temperature To, [m]<\/div>\n
\t Sliding points must be securely fixed to ensure system alignment, support, and axial movement,<\/div>\n
\t preventing vibrations and noise transmission.<\/div>\n
\t Calculation of the length of an “L” type expansion compensator<\/div>\n
\t <\/div>\n
\t Where<\/div>\n
\t  Lb = expansion arm length, [mm]<\/div>\n
\t  d = pipe outer diameter, [mm]<\/div>\n
\t  \u0394L = total pipe length variation [mm]<\/div>\n
\t  C = dimensionless material constant (C = 30 for PP-R)<\/div>\n
\t  FP: fixed point; SP: sliding point<\/div>\n
\t Calculation of the “U” expansion compensator<\/div>\n
\t The U compensator is an assembly of 2 L-type compensators, whose length is calculated with the formula above and minimum width as follows:<\/div>\n
\t above, and the minimum width as follows:<\/div>\n
\t  Lc = 2 x \u0394L + ms,<\/div>\n
\t  Lc \u2013 minimum compensator width;<\/div>\n
\t  ms – safety width = 150 mm<\/div>\n

VALDuotherm PP-R SDR 7.4 pipe is used for indoor cold and hot water supply installations, as follows:
– Class 1 – hot water 60\u00b0C – PN 8 bar; design temperature for service life: 60\u00b0C\/49 years + 80\u00b0C\/1 year + 95\u00b0C\/100 hours;
– Class 2 (hot water 70\u00b0C) – PN 6 bar; design temperature for service life: 70\u00b0C\/49 years + 80\u00b0C\/1 year + 95\u00b0C\/100 hours;
– cold water PN 16 bar at c = 1.5 and PN 20 bar at c = 1.25 (Informative – In accordance with ISO 15874-1 – the design pressure for sanitary cold water installations for a period of 50 years at a temperature of 20\u00b0C is 10 bar).<\/p>\n

The linear expansion coefficient for single-layer PP-R pipes is \u03b1 = 0.15 mm\/m K, which is why before wall mounting (exposed installation) of PP-R pipes, the effect of pipe expansion or contraction must be evaluated. Correct installation of clamps or other types of supports and correct positioning of expansion compensators prevent uncontrolled pipe movement due to temperature variations during installation and operation. As a rule, system expansion is compensated between 2 fixed points by changing direction, using an expansion loop, or where not possible, compensators must be fixed between the pipe and the structure. The fixing clamps (also called fixed points) of the system are positioned near branches, valves, or wall penetrations, while sliding clamps are mounted along the installation route at well-defined distances. This ensures system alignment, support, and controlled axial movement. When installing PP-R pipes in screed or walls, they must be installed in protective conduits with a flexible, well-insulating structure capable of absorbing pipe expansion. In case of excessive expansion that is difficult to compensate with the insulating protective conduit, an expansion compensator must be calculated and installed. Attention, pipes must be installed at an acceptable depth under the screed or inside the wall to avoid cracks; additionally, excessive internal stresses at joints must be avoided. The installation depth must be greater than or equal to 1.5 \u00d7 the outer diameter of the pipe. Threaded joints are not accepted in screed or walls. The pressure test is performed before final embedding of the pipe\/installation. <\/p>\n

The technical manual addresses methods for evaluating expansion and ways to compensate for it, including clamp positioning.<\/p>\n","protected":false},"excerpt":{"rendered":"

For indoor cold and hot water supply installations, as follows: – Class 1 (hot water 60\u00b0C) – design temperature for service life: 60\u00b0C\/49 years + 80\u00b0C\/1 year + 95\u00b0C\/100 hours. – Class 2 (hot water 70\u00b0C) – design temperature for service life: 70\u00b0C\/49 years + 80\u00b0C\/1 year + 95\u00b0C\/100 hours. INSTALLATION For PP-R pipes not installed embedded in a protective conduit (where expansion occurs within the conduit) and for large diameter pipes, measures for expansion compensation must be taken from the design phase. PPR pipes have the following expansion coefficient: – PP-R (alpha) = 0.15 mm\/m K, – PP-R\/FIBER (alpha) = 0.088 mm\/m K – PP-R\/Al (alpha) = 0.03 mm\/m K. For exposed installation, it is necessary to secure the system to prevent uncontrolled pipe movement. Linear expansion is compensated between two fixed points. The fixed points of the system are positioned near branches, valves, or wall penetrations. Fixed points are placed so that expansion forces. The variation in pipe length depending on pipe length and temperature variation is calculated using the following formula: \u0394L = \u03b1 x \u0394T x L \u0394L = L-Lo \u0394T = T – To where: \u0394L = total pipe length variation [mm] \u0394T = total temperature variation \u03b1 = linear expansion coefficient, [mm\/m K] T = operating temperature To = installation temperature L = pipe length at temperature T, [m] Lo = pipe length at temperature To, [m] Sliding points must be securely fixed to ensure system alignment, support, and axial movement, preventing vibrations and noise transmission. Calculation of the length of an L-type expansion compensator Where Lb = expansion arm length, [mm] d = pipe outer diameter, [mm] \u0394L = total pipe length variation [mm] C = dimensionless material constant (C = 30 for PP-R) FP: fixed point. SP: sliding point. Calculation of the U expansion compensator. The U compensator is an assembly of 2 L-type compensators, whose length is calculated with the formula above and the minimum width as follows: Lc = 2 x \u0394L + ms, Lc minimum compensator width. ms – safety width = 150 mm <\/p>\n","protected":false},"featured_media":97208,"template":"","meta":{"inline_featured_image":false,"wds_primary_product_brand":0,"wds_primary_product_cat":0},"product_brand":[],"product_cat":[8059],"product_tag":[],"class_list":{"0":"post-129291","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"product_cat-gray-ppr-pressure-pipes","8":"first","9":"instock","10":"shipping-taxable","11":"product-type-simple"},"yoast_head":"\nVALDuotherm GREY PPR PIPE D. 32x4.4mm SDR 7.4 L 4m - Produse.Valrom.ro<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/produse.valrom.ro\/en\/product\/teava-valduotherm-gri-ppr-d-32x44mm-sdr74-l4m\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"VALDuotherm GREY PPR PIPE D. 32x4.4mm SDR 7.4 L 4m\" \/>\n<meta property=\"og:description\" content=\"For indoor cold and hot water supply installations, as follows: - Class 1 (hot water 60\u00b0C) - design temperature for service life: 60\u00b0C\/49 years + 80\u00b0C\/1 year + 95\u00b0C\/100 hours. - Class 2 (hot water 70\u00b0C) - design temperature for service life: 70\u00b0C\/49 years + 80\u00b0C\/1 year + 95\u00b0C\/100 hours. INSTALLATION For PP-R pipes not installed embedded in a protective conduit (where expansion occurs within the conduit) and for large diameter pipes, measures for expansion compensation must be taken from the design phase. PPR pipes have the following expansion coefficient: - PP-R (alpha) = 0.15 mm\/m K, - PP-R\/FIBER (alpha) = 0.088 mm\/m K - PP-R\/Al (alpha) = 0.03 mm\/m K. For exposed installation, it is necessary to secure the system to prevent uncontrolled pipe movement. Linear expansion is compensated between two fixed points. The fixed points of the system are positioned near branches, valves, or wall penetrations. Fixed points are placed so that expansion forces. The variation in pipe length depending on pipe length and temperature variation is calculated using the following formula: \u0394L = \u03b1 x \u0394T x L \u0394L = L-Lo \u0394T = T - To where: \u0394L = total pipe length variation [mm] \u0394T = total temperature variation \u03b1 = linear expansion coefficient, [mm\/m K] T = operating temperature To = installation temperature L = pipe length at temperature T, [m] Lo = pipe length at temperature To, [m] Sliding points must be securely fixed to ensure system alignment, support, and axial movement, preventing vibrations and noise transmission. Calculation of the length of an L-type expansion compensator Where Lb = expansion arm length, [mm] d = pipe outer diameter, [mm] \u0394L = total pipe length variation [mm] C = dimensionless material constant (C = 30 for PP-R) FP: fixed point. SP: sliding point. Calculation of the U expansion compensator. The U compensator is an assembly of 2 L-type compensators, whose length is calculated with the formula above and the minimum width as follows: Lc = 2 x \u0394L + ms, Lc minimum compensator width. ms - safety width = 150 mm\" \/>\n<meta property=\"og:url\" content=\"https:\/\/produse.valrom.ro\/en\/product\/teava-valduotherm-gri-ppr-d-32x44mm-sdr74-l4m\/\" \/>\n<meta property=\"og:site_name\" content=\"Produse.Valrom.ro\" \/>\n<meta property=\"article:modified_time\" content=\"2026-03-31T16:27:51+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/produse.valrom.ro\/wp-content\/uploads\/2025\/10\/133162_l.jpeg\" \/>\n\t<meta property=\"og:image:width\" content=\"800\" \/>\n\t<meta property=\"og:image:height\" content=\"800\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data1\" content=\"4 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/produse.valrom.ro\/en\/product\/teava-valduotherm-gri-ppr-d-32x44mm-sdr74-l4m\/\",\"url\":\"https:\/\/produse.valrom.ro\/en\/product\/teava-valduotherm-gri-ppr-d-32x44mm-sdr74-l4m\/\",\"name\":\"VALDuotherm GREY PPR PIPE D. 32x4.4mm SDR 7.4 L 4m - Produse.Valrom.ro\",\"isPartOf\":{\"@id\":\"https:\/\/produse.valrom.ro\/en\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\/\/produse.valrom.ro\/en\/product\/teava-valduotherm-gri-ppr-d-32x44mm-sdr74-l4m\/#primaryimage\"},\"image\":{\"@id\":\"https:\/\/produse.valrom.ro\/en\/product\/teava-valduotherm-gri-ppr-d-32x44mm-sdr74-l4m\/#primaryimage\"},\"thumbnailUrl\":\"https:\/\/produse.valrom.ro\/wp-content\/uploads\/2025\/10\/133162_l.jpeg\",\"datePublished\":\"2025-10-06T20:55:28+00:00\",\"dateModified\":\"2026-03-31T16:27:51+00:00\",\"breadcrumb\":{\"@id\":\"https:\/\/produse.valrom.ro\/en\/product\/teava-valduotherm-gri-ppr-d-32x44mm-sdr74-l4m\/#breadcrumb\"},\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/produse.valrom.ro\/en\/product\/teava-valduotherm-gri-ppr-d-32x44mm-sdr74-l4m\/\"]}]},{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\/\/produse.valrom.ro\/en\/product\/teava-valduotherm-gri-ppr-d-32x44mm-sdr74-l4m\/#primaryimage\",\"url\":\"https:\/\/produse.valrom.ro\/wp-content\/uploads\/2025\/10\/133162_l.jpeg\",\"contentUrl\":\"https:\/\/produse.valrom.ro\/wp-content\/uploads\/2025\/10\/133162_l.jpeg\",\"width\":800,\"height\":800},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/produse.valrom.ro\/en\/product\/teava-valduotherm-gri-ppr-d-32x44mm-sdr74-l4m\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\/\/produse.valrom.ro\/en\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Shop\",\"item\":\"https:\/\/produse.valrom.ro\/en\/shop\/\"},{\"@type\":\"ListItem\",\"position\":3,\"name\":\"VALDuotherm GREY PPR PIPE D. 32×4.4mm SDR 7.4 L 4m\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\/\/produse.valrom.ro\/en\/#website\",\"url\":\"https:\/\/produse.valrom.ro\/en\/\",\"name\":\"Produse.Valrom.ro\",\"description\":\"Valrom Industry\",\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\/\/produse.valrom.ro\/en\/?s={search_term_string}\"},\"query-input\":{\"@type\":\"PropertyValueSpecification\",\"valueRequired\":true,\"valueName\":\"search_term_string\"}}],\"inLanguage\":\"en-US\"}]}<\/script>\n<!-- \/ Yoast SEO Premium plugin. -->","yoast_head_json":{"title":"VALDuotherm GREY PPR PIPE D. 32x4.4mm SDR 7.4 L 4m - Produse.Valrom.ro","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/produse.valrom.ro\/en\/product\/teava-valduotherm-gri-ppr-d-32x44mm-sdr74-l4m\/","og_locale":"en_US","og_type":"article","og_title":"VALDuotherm GREY PPR PIPE D. 32x4.4mm SDR 7.4 L 4m","og_description":"For indoor cold and hot water supply installations, as follows: - Class 1 (hot water 60\u00b0C) - design temperature for service life: 60\u00b0C\/49 years + 80\u00b0C\/1 year + 95\u00b0C\/100 hours. - Class 2 (hot water 70\u00b0C) - design temperature for service life: 70\u00b0C\/49 years + 80\u00b0C\/1 year + 95\u00b0C\/100 hours. INSTALLATION For PP-R pipes not installed embedded in a protective conduit (where expansion occurs within the conduit) and for large diameter pipes, measures for expansion compensation must be taken from the design phase. PPR pipes have the following expansion coefficient: - PP-R (alpha) = 0.15 mm\/m K, - PP-R\/FIBER (alpha) = 0.088 mm\/m K - PP-R\/Al (alpha) = 0.03 mm\/m K. For exposed installation, it is necessary to secure the system to prevent uncontrolled pipe movement. Linear expansion is compensated between two fixed points. The fixed points of the system are positioned near branches, valves, or wall penetrations. Fixed points are placed so that expansion forces. The variation in pipe length depending on pipe length and temperature variation is calculated using the following formula: \u0394L = \u03b1 x \u0394T x L \u0394L = L-Lo \u0394T = T - To where: \u0394L = total pipe length variation [mm] \u0394T = total temperature variation \u03b1 = linear expansion coefficient, [mm\/m K] T = operating temperature To = installation temperature L = pipe length at temperature T, [m] Lo = pipe length at temperature To, [m] Sliding points must be securely fixed to ensure system alignment, support, and axial movement, preventing vibrations and noise transmission. Calculation of the length of an L-type expansion compensator Where Lb = expansion arm length, [mm] d = pipe outer diameter, [mm] \u0394L = total pipe length variation [mm] C = dimensionless material constant (C = 30 for PP-R) FP: fixed point. SP: sliding point. Calculation of the U expansion compensator. The U compensator is an assembly of 2 L-type compensators, whose length is calculated with the formula above and the minimum width as follows: Lc = 2 x \u0394L + ms, Lc minimum compensator width. ms - safety width = 150 mm","og_url":"https:\/\/produse.valrom.ro\/en\/product\/teava-valduotherm-gri-ppr-d-32x44mm-sdr74-l4m\/","og_site_name":"Produse.Valrom.ro","article_modified_time":"2026-03-31T16:27:51+00:00","og_image":[{"width":800,"height":800,"url":"https:\/\/produse.valrom.ro\/wp-content\/uploads\/2025\/10\/133162_l.jpeg","type":"image\/jpeg"}],"twitter_card":"summary_large_image","twitter_misc":{"Est. reading time":"4 minutes"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"WebPage","@id":"https:\/\/produse.valrom.ro\/en\/product\/teava-valduotherm-gri-ppr-d-32x44mm-sdr74-l4m\/","url":"https:\/\/produse.valrom.ro\/en\/product\/teava-valduotherm-gri-ppr-d-32x44mm-sdr74-l4m\/","name":"VALDuotherm GREY PPR PIPE D. 32x4.4mm SDR 7.4 L 4m - Produse.Valrom.ro","isPartOf":{"@id":"https:\/\/produse.valrom.ro\/en\/#website"},"primaryImageOfPage":{"@id":"https:\/\/produse.valrom.ro\/en\/product\/teava-valduotherm-gri-ppr-d-32x44mm-sdr74-l4m\/#primaryimage"},"image":{"@id":"https:\/\/produse.valrom.ro\/en\/product\/teava-valduotherm-gri-ppr-d-32x44mm-sdr74-l4m\/#primaryimage"},"thumbnailUrl":"https:\/\/produse.valrom.ro\/wp-content\/uploads\/2025\/10\/133162_l.jpeg","datePublished":"2025-10-06T20:55:28+00:00","dateModified":"2026-03-31T16:27:51+00:00","breadcrumb":{"@id":"https:\/\/produse.valrom.ro\/en\/product\/teava-valduotherm-gri-ppr-d-32x44mm-sdr74-l4m\/#breadcrumb"},"inLanguage":"en-US","potentialAction":[{"@type":"ReadAction","target":["https:\/\/produse.valrom.ro\/en\/product\/teava-valduotherm-gri-ppr-d-32x44mm-sdr74-l4m\/"]}]},{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/produse.valrom.ro\/en\/product\/teava-valduotherm-gri-ppr-d-32x44mm-sdr74-l4m\/#primaryimage","url":"https:\/\/produse.valrom.ro\/wp-content\/uploads\/2025\/10\/133162_l.jpeg","contentUrl":"https:\/\/produse.valrom.ro\/wp-content\/uploads\/2025\/10\/133162_l.jpeg","width":800,"height":800},{"@type":"BreadcrumbList","@id":"https:\/\/produse.valrom.ro\/en\/product\/teava-valduotherm-gri-ppr-d-32x44mm-sdr74-l4m\/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https:\/\/produse.valrom.ro\/en\/"},{"@type":"ListItem","position":2,"name":"Shop","item":"https:\/\/produse.valrom.ro\/en\/shop\/"},{"@type":"ListItem","position":3,"name":"VALDuotherm GREY PPR PIPE D. 32×4.4mm SDR 7.4 L 4m"}]},{"@type":"WebSite","@id":"https:\/\/produse.valrom.ro\/en\/#website","url":"https:\/\/produse.valrom.ro\/en\/","name":"Produse.Valrom.ro","description":"Valrom Industry","potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/produse.valrom.ro\/en\/?s={search_term_string}"},"query-input":{"@type":"PropertyValueSpecification","valueRequired":true,"valueName":"search_term_string"}}],"inLanguage":"en-US"}]}},"_links":{"self":[{"href":"https:\/\/produse.valrom.ro\/en\/wp-json\/wp\/v2\/product\/129291","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/produse.valrom.ro\/en\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/produse.valrom.ro\/en\/wp-json\/wp\/v2\/types\/product"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/produse.valrom.ro\/en\/wp-json\/wp\/v2\/media\/97208"}],"wp:attachment":[{"href":"https:\/\/produse.valrom.ro\/en\/wp-json\/wp\/v2\/media?parent=129291"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/produse.valrom.ro\/en\/wp-json\/wp\/v2\/product_brand?post=129291"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/produse.valrom.ro\/en\/wp-json\/wp\/v2\/product_cat?post=129291"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/produse.valrom.ro\/en\/wp-json\/wp\/v2\/product_tag?post=129291"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}