{"id":5409,"date":"2025-10-31T10:46:51","date_gmt":"2025-10-31T02:46:51","guid":{"rendered":"https:\/\/www.shopvalves.com\/?post_type=product&#038;p=5409"},"modified":"2025-10-31T10:52:16","modified_gmt":"2025-10-31T02:52:16","slug":"gestra-rk71","status":"publish","type":"product","link":"https:\/\/www.shopvalves.com\/en\/product\/gestra-rk71\/","title":{"rendered":"GESTRA GESTRA RK71 Non-return valve Brass check valve"},"content":{"rendered":"<p>The GESTRA RK71 non-return valve is a classic DISCO\u00ae series product under the German GESTRA brand, designed for industrial piping systems to provide reliable protection against backflow. As a high quality brass non-return valve, it is suitable for pressure ratings from PN6-16 and diameters from DN15-100 and ensures unidirectional flow of liquids, gases and vapors.GESTRA RK71 non-return valves are known for their compact design and durable materials and are widely used in heating, HVAC and compressed air systems.<\/p>\n<h2>Product specifications and technical parameters<\/h2>\n<p>GESTRA RK71 non-return valves have a wafer-type construction that is easy to clamp between flanges and complies with international standards to ensure easy installation. Detailed specifications are given below:<\/p>\n<ul>\n<li><strong>Nominal pressure (PN)<\/strong>:: 6\/10\/16 barg.<\/li>\n<li><strong>Nominal diameter (DN)<\/strong>: 15-100 mm (equivalent to 1\/2\" - 4\").<\/li>\n<li><strong>temperature range<\/strong>: -60\u00b0C to 250\u00b0C (depending on pressure and media, up to 100\u00b0C for standard heating applications).<\/li>\n<li><strong>Cracking Pressure<\/strong>: 10-18 mbar for spring-loaded versions, 2.5-6.5 mbar for spring-less versions (depending on DN size).<\/li>\n<li><strong>Size &amp; Weight<\/strong>(Example):\n<ul>\n<li>DN 15: Length 16 mm, diameter 40 mm, weight 0.09 kg.<\/li>\n<li>DN 50: length 40 mm, diameter 95 mm, weight 1.05 kg.<\/li>\n<li>DN 100: length 60 mm, diameter 152 mm, weight 3.2 kg.<\/li>\n<\/ul>\n<\/li>\n<li><strong>Flange connection standard<\/strong>: DIN\/EN BS EN 1092-1 (Form B1), BS 10 Table D\/E\/F.<\/li>\n<li><strong>Pressure Temperature Ratings<\/strong>(RK71 PN16 CW617N example):<br \/>\n<table>\n<thead>\n<tr>\n<th>Temperature (\u00b0C)<\/th>\n<th>20<\/th>\n<th>120<\/th>\n<th>200<\/th>\n<th>250<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Pressure (barg)<\/td>\n<td>16<\/td>\n<td>16<\/td>\n<td>14<\/td>\n<td>13<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/li>\n<\/ul>\n<p>The overall length of the GESTRA RK71 check valve is in accordance with EN 558-1 Series 49. The extremely short design reduces installation space requirements. For further technical details please refer to<a href=\"https:\/\/www.barthel-armaturen.de\/en\/amfile\/file\/download\/file\/1955\/\" target=\"_blank\" rel=\"noopener\">Official Data Sheet PDF<\/a>The<\/p>\n<h2>Material and structural characteristics<\/h2>\n<p>GESTRA RK71 non-return valves are made of high-quality materials to ensure corrosion resistance and long life:<\/p>\n<ul>\n<li><strong>Body, Seat and Guide Ribs<\/strong>: CW617N hot pressed brass (ASTM C38000 equivalent), corrosion resistant and suitable for non-hazardous media.<\/li>\n<li><strong>Valve discs, springs and retainers<\/strong>: 1.4571 austenitic stainless steel (AISI 316 Ti equivalent), supplied with metal-to-metal seals (optional EPDM, FPM or PTFE soft seals for water, steam, mineral oils or corrosive media).<\/li>\n<li><strong>Other components<\/strong>: The spring retainer and centering ring are made of stainless steel to ensure stable operation.<\/li>\n<\/ul>\n<p>Key features include:<\/p>\n<ul>\n<li><strong>Spring-assisted design<\/strong>: Allows installation in any position (horizontal, vertical or inclined), the springless version is limited to vertical upward flow.<\/li>\n<li><strong>Low pressure drop and low noise<\/strong>: Four guide ribs reduce wear and optimize fluid passage.<\/li>\n<li><strong>Compact and lightweight<\/strong>: Weight is much lower than conventional valves, reducing installation costs.<\/li>\n<li><strong>standards-compliant<\/strong>: Leakage tested to DIN EN 12266-1, PED 97\/23\/EC certified for Fluid Group 2 media. Without own ignition source, can be used around Ex zones (see ATEX declaration for details).<\/li>\n<li><strong>Antistatic option<\/strong>: Anti-static connections can be customized and added.<\/li>\n<\/ul>\n<p>These features allow GESTRA RK71 brass check valves to excel in industrial applications and reduce maintenance requirements. Chemical resistance details are available at<a href=\"https:\/\/www.gestra.com\/global\/en-US\/products\/check-valves\/non-return-valves\" target=\"_blank\" rel=\"noopener\">GESTRA official website technical support<\/a>The<\/p>\n<h2>Areas of application and advantages<\/h2>\n<p>GESTRA RK71 non-return valves are used in a wide range of industrial scenarios to ensure safe and efficient system operation:<\/p>\n<ul>\n<li><strong>Heating and HVAC systems<\/strong>: Prevents backflow of hot water or steam, suitable for compressed air and ventilation ducts.<\/li>\n<li><strong>Steam and condensate systems<\/strong>: Provides reverse run protection in parallel pump arrangements.<\/li>\n<li><strong>Industrial Piping<\/strong>: For one-way control of liquids, gases and vapors to prevent backflow contamination or damage to equipment.<\/li>\n<li><strong>(sth. or sb) else<\/strong>: Compressed air systems, sanitary engineering and air conditioning technology.<\/li>\n<\/ul>\n<p>Advantage:<\/p>\n<ul>\n<li><strong>high reliability<\/strong>: Metal seals ensure a tight seal, and soft seal options boost leakage rates to Class A.<\/li>\n<li><strong>cost-effective<\/strong>: Low installation costs, low pressure drop and reduced energy consumption.<\/li>\n<li><strong>easy maintenance<\/strong>: Compact design for easy removal and replacement.<\/li>\n<\/ul>\n<p>For minimum volumetric flow requirements for specific applications, refer to the<a href=\"https:\/\/www.flexachem.com\/wp-content\/uploads\/2014\/01\/Gestra-Non-Return-Check-Valves.pdf\" target=\"_blank\" rel=\"noopener\">GESTRA Non-Return Valves Brochure PDF<\/a>to ensure stable opening of the valve disc.<\/p>\n<h2>Certification and Documentation<\/h2>\n<ul>\n<li><strong>accreditation<\/strong>: CE marking (PED 97\/23\/EC), material test report EN10204-2.2 optional.<\/li>\n<li><strong>Related Documents<\/strong>::\n<ul>\n<li><a href=\"https:\/\/www.barthel-armaturen.de\/en\/amfile\/file\/download\/file\/1955\/\" target=\"_blank\" rel=\"noopener\">RK71 Product Data Sheet<\/a>\u00a0- Includes pressure drop charts and installation instructions.<\/li>\n<li><a href=\"https:\/\/www.flexachem.com\/wp-content\/uploads\/2014\/01\/Gestra-Non-Return-Check-Valves.pdf\" target=\"_blank\" rel=\"noopener\">GESTRA Complete Non-Return Valve Brochure<\/a>\u00a0- Detailed application examples and technical diagrams.<\/li>\n<li><a href=\"https:\/\/www.gestra.com\/global\/en-US\/products\/check-valves\/non-return-valves\" target=\"_blank\" rel=\"noopener\">GESTRA official website product page<\/a>\u00a0- Latest updates and support.<\/li>\n<\/ul>\n<\/li>\n<\/ul>","protected":false},"excerpt":{"rendered":"<p>The GESTRA RK71 non-return valve is a classic DISCO\u00ae series product under the German GESTRA brand, designed for industrial piping systems, offering...<\/p>","protected":false},"featured_media":5410,"template":"","meta":{"_kadence_starter_templates_imported_post":false,"_kad_post_transparent":"default","_kad_post_title":"","_kad_post_layout":"default","_kad_post_sidebar_id":"","_kad_post_content_style":"default","_kad_post_vertical_padding":"default","_kad_post_feature":"","_kad_post_feature_position":"","_kad_post_header":false,"_kad_post_footer":false},"product_brand":[196],"product_cat":[76,55],"product_tag":[],"class_list":{"0":"post-5409","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"product_brand-gestra","7":"product_cat-check-valves","8":"product_cat-pipeline-ancillaries","10":"first","11":"instock","12":"shipping-taxable","13":"product-type-simple","14":"entry","15":"content-bg","16":"loop-entry"},"_links":{"self":[{"href":"https:\/\/www.shopvalves.com\/en\/wp-json\/wp\/v2\/product\/5409","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.shopvalves.com\/en\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/www.shopvalves.com\/en\/wp-json\/wp\/v2\/types\/product"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.shopvalves.com\/en\/wp-json\/wp\/v2\/media\/5410"}],"wp:attachment":[{"href":"https:\/\/www.shopvalves.com\/en\/wp-json\/wp\/v2\/media?parent=5409"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/www.shopvalves.com\/en\/wp-json\/wp\/v2\/product_brand?post=5409"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/www.shopvalves.com\/en\/wp-json\/wp\/v2\/product_cat?post=5409"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/www.shopvalves.com\/en\/wp-json\/wp\/v2\/product_tag?post=5409"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}