{"id":5288,"date":"2025-09-16T17:35:21","date_gmt":"2025-09-16T09:35:21","guid":{"rendered":"https:\/\/www.shopvalves.com\/?post_type=product&#038;p=5288"},"modified":"2025-09-16T17:48:05","modified_gmt":"2025-09-16T09:48:05","slug":"gestra-rk76","status":"publish","type":"product","link":"https:\/\/www.shopvalves.com\/en\/product\/gestra-rk76\/","title":{"rendered":"GESTRA GESTRA RK76 Wafer Type Check Valve - PN40 Stainless Steel Flanged Check Valve"},"content":{"rendered":"<p>The GESTRA RK76 is a high-end wafer-type non-return valve designed for industrial piping systems to reliably prevent the backflow of liquid, gas and steam media. With its disco construction, spring-assisted closing mechanism, support for any mounting position (horizontal or vertical) and precise centering by means of a helical center ring, the RK76 complies with the European Union's PED Pressure Equipment Directive and EN 558-1 standards, and features an extremely short mounting length (49 in the basic series) and a compact, lightweight design, making it an ideal choice for use in steam systems, chemical piping, and fluid transfer. The RK76 complies with the EU PED Pressure Equipment Directive and EN 558-1 standards.<\/p>\n<p>Whether in hot water circulation, condensate recovery, mineral oil transfer or corrosive gas applications, the GESTRA RK76 provides low cracking pressures (2.5-18 mbar) and zero leakage protection for safe and stable system operation. A wide range of seat material options (metal-to-metal, PTFE, EPDM, FPM) are available to suit different media requirements and support PN 6\/10\/16\/25\/40 and ASME CL 125\/150\/300 pressure ratings.<\/p>\n<p><strong>byword<\/strong>: GESTRA RK76 Check Valve, Wafer Check Valve, Stainless Steel Check Valve, Wafer Check Valve, Steam Check Valve, Industrial Non-Rotary Valve.<\/p>\n<h2>Key Features and Benefits<\/h2>\n<ul>\n<li><strong>compact design<\/strong>Face-to-face lengths of only 16-60 mm (depending on DN) allow for easy flange-to-flange clamping installation, saving space and reducing system weight.<\/li>\n<li><strong>Flexible installation<\/strong>: Built-in stainless steel spring supports installation on any flat surface; the springless version is suitable for vertical upward flow and adapts to complex piping layouts.<\/li>\n<li><strong>Low opening pressure<\/strong>: Standard 2.5-6.5 mbar (without spring) or 5-18 mbar (with spring), optionally with special spring (20-1000 mbar) to ensure reliable opening at minimum flow rate.<\/li>\n<li><strong>Durable materials<\/strong>: Valve body is 1.4107 chrome steel (DIN\/EN) or SA217 CA15 (ASME) with 1.4571 stainless steel disc and spring for corrosion resistance for extreme environments from -190\u00b0C to 300\u00b0C.<\/li>\n<li><strong>Zero Leakage Guarantee<\/strong>: Leakage rates of Class D for metal seats and Class A for soft seals (EPDM\/FPM) according to DIN EN 12266 prevent equipment damage or loss of efficiency due to backflow.<\/li>\n<li><strong>Customization Options<\/strong>: Silicone-free\/grease-free versions, pickled passivation treatments, aperture hole designs, and ASME RF seals are supported to meet specific industry needs.<\/li>\n<\/ul>\n<p>These features make the GESTRA RK76 stand out in industrial applications, offering higher reliability and lower maintenance costs.<\/p>\n<h2>technical specification<\/h2>\n<h3>Pressure\/Temperature Rating<\/h3>\n<table>\n<thead>\n<tr>\n<th>(an official) standard<\/th>\n<th>pressure rating<\/th>\n<th>temperature range<\/th>\n<th>Maximum pressure (barg) Example<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>DIN\/EN<\/td>\n<td>PN 40<\/td>\n<td>-10\u00b0C to 300\u00b0C<\/td>\n<td>40.0 (-10\u00b0C) to 25.8 (300\u00b0C)<\/td>\n<\/tr>\n<tr>\n<td>ASME<\/td>\n<td>CL 300<\/td>\n<td>-10\u00b0C to 300\u00b0C<\/td>\n<td>49.6 (-10\u00b0C) to 31.6 (300\u00b0C)<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h3>Dimensions and Weight Chart<\/h3>\n<table>\n<thead>\n<tr>\n<th>Nominal diameter DN (mm)<\/th>\n<th>inch (unit of length equal 2.54 cm.)<\/th>\n<th>Face-to-face length L (mm)<\/th>\n<th>Flange Diameter \u2205 D (PN 6-40, mm)<\/th>\n<th>Weight (kg)<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>15<\/td>\n<td>\u00bd<\/td>\n<td>16<\/td>\n<td>45<\/td>\n<td>0.18<\/td>\n<\/tr>\n<tr>\n<td>20<\/td>\n<td>\u00be<\/td>\n<td>19<\/td>\n<td>55<\/td>\n<td>0.30<\/td>\n<\/tr>\n<tr>\n<td>25<\/td>\n<td>1<\/td>\n<td>22<\/td>\n<td>65<\/td>\n<td>0.45<\/td>\n<\/tr>\n<tr>\n<td>32<\/td>\n<td>1\u00bc<\/td>\n<td>28<\/td>\n<td>75<\/td>\n<td>0.70<\/td>\n<\/tr>\n<tr>\n<td>40<\/td>\n<td>1\u00bd<\/td>\n<td>31.5<\/td>\n<td>85<\/td>\n<td>0.90<\/td>\n<\/tr>\n<tr>\n<td>50<\/td>\n<td>2<\/td>\n<td>40<\/td>\n<td>98<\/td>\n<td>1.50<\/td>\n<\/tr>\n<tr>\n<td>65<\/td>\n<td>2\u00bd<\/td>\n<td>46<\/td>\n<td>118<\/td>\n<td>2.10<\/td>\n<\/tr>\n<tr>\n<td>80<\/td>\n<td>3<\/td>\n<td>50<\/td>\n<td>134<\/td>\n<td>3.40<\/td>\n<\/tr>\n<tr>\n<td>100<\/td>\n<td>4<\/td>\n<td>60<\/td>\n<td>154<\/td>\n<td>5.20<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<ul>\n<li><strong>Nominal diameter range<\/strong>: DN 15-100 mm (NPS \u00bd-4).<\/li>\n<li><strong>connection standard<\/strong>: DIN EN 1092 B (PN 6\/10\/16\/25\/40), ASME B16.5 (CL 150\/300 RF), BS 10 (Table D\/E\/F\/H\/J), JIS B2238 10K.<\/li>\n<li><strong>Seat Options<\/strong>::<br \/>\n<table>\n<thead>\n<tr>\n<th>typology<\/th>\n<th>temperature range<\/th>\n<th>Leakage rate (DIN EN 12266)<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Metal-metal<\/td>\n<td>-10\u00b0C to 300\u00b0C<\/td>\n<td>Class D<\/td>\n<\/tr>\n<tr>\n<td>PTFE<\/td>\n<td>-190\u00b0C to 250\u00b0C<\/td>\n<td>Class D<\/td>\n<\/tr>\n<tr>\n<td>EPDM<\/td>\n<td>-40\u00b0C to 150\u00b0C<\/td>\n<td>Class A<\/td>\n<\/tr>\n<tr>\n<td>FPM<\/td>\n<td>-25\u00b0C to 200\u00b0C<\/td>\n<td>Class A<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/li>\n<\/ul>\n<h3>Material composition<\/h3>\n<ul>\n<li>Body\/seat\/guide: 1.4107 chrome steel (DIN\/EN) \/ SA217 CA15 (ASME).<\/li>\n<li>Valve disc\/spring retainer: 1.4571 stainless steel.<\/li>\n<li>Spring: stainless steel.<\/li>\n<li>Spiral center ring: 1.4310 chrome steel.<\/li>\n<\/ul>\n<h2>application scenario<\/h2>\n<p>The GESTRA RK76 is widely used:<\/p>\n<ul>\n<li><strong>Steam and condensate systems<\/strong>: Prevents steam backflow and protects pumps and heat exchangers.<\/li>\n<li><strong>Chemical and Petroleum Pipelines<\/strong>: Handles mineral oils, gases and corrosive fluids to ensure safe transportation.<\/li>\n<li><strong>Industrial gas\/air lines<\/strong>: Reliable closure under low differential pressure for compressed air systems.<\/li>\n<li><strong>Water Treatment &amp; HVAC<\/strong>: EPDM\/PTFE seat option for water and neutral media.<\/li>\n<\/ul>\n<p>Note: Not recommended for severe pulsatile flow or high differential pressure; smaller sizes are recommended for DN 65\/80 to optimize performance.<\/p>\n<h2>Installation and Maintenance Guide<\/h2>\n<h3>Installation steps<\/h3>\n<ol>\n<li>Verify that the direction of media flow is consistent with the valve body arrow.<\/li>\n<li>Place the valve between the two flanges and tighten evenly in diagonal sequence using standard gaskets and long bolts (torque according to flange standards).<\/li>\n<li>Ensure installation with zero system pressure; spring-loaded versions can be installed in any orientation, non-spring-loaded only vertically upward.<\/li>\n<li>Verify minimum volumetric flow to hold the valve disc open (see data sheet for details).<\/li>\n<\/ol>\n<h3>Maintenance recommendations<\/h3>\n<ul>\n<li><strong>regular inspection<\/strong>: Clean valve discs and seats and check spring integrity every 6-12 months.<\/li>\n<li><strong>fault resolution<\/strong>::\n<ul>\n<li>Leakage: Clean foreign material or replace seat.<\/li>\n<li>Does not open: Check spring pressure or medium viscosity.<\/li>\n<\/ul>\n<\/li>\n<li><strong>Replacement parts<\/strong>: Bonnet is removable for easy replacement of springs or discs; use genuine factory parts to ensure compatibility.<\/li>\n<\/ul>\n<p>Proper maintenance can extend the life of the RK76 to over 10 years.<\/p>\n<h2>Related Documents<\/h2>\n<ul>\n<li><a href=\"https:\/\/content.gestra.com\/-\/media\/gestra\/international\/documents\/en\/dbl\/dbl_810294_05_rk76_en.ashx?rev=53118457047e4efa8f8c3d2eae942d17\" target=\"_blank\" rel=\"noopener\">Official Data Sheet (PDF)<\/a>: Complete specifications, drawings and installation drawings.<\/li>\n<li><a href=\"https:\/\/www.gestra.com\/global\/en-GES\/products\/check-valves\/non-return-check-valves\" target=\"_blank\" rel=\"noopener\">GESTRA Official Product Page<\/a>: More variants and selection tools.<\/li>\n<li><a href=\"http:\/\/www.naparin.com\/download\/naparin_com\/pdf_valves\/DBL_810294_03_RK76_en.pdf\" target=\"_blank\" rel=\"noopener\">Technical Brochure PDF<\/a>: Detailed dimensions and pressure curves.<\/li>\n<\/ul>","protected":false},"excerpt":{"rendered":"<p>GESTRA RK76 is a high-end wafer-type non-rotating check valve from the well-known German valve brand GESTRA....<\/p>","protected":false},"featured_media":5290,"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-5288","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\/5288","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\/5290"}],"wp:attachment":[{"href":"https:\/\/www.shopvalves.com\/en\/wp-json\/wp\/v2\/media?parent=5288"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/www.shopvalves.com\/en\/wp-json\/wp\/v2\/product_brand?post=5288"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/www.shopvalves.com\/en\/wp-json\/wp\/v2\/product_cat?post=5288"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/www.shopvalves.com\/en\/wp-json\/wp\/v2\/product_tag?post=5288"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}