{"id":50,"date":"2026-10-05T20:12:07","date_gmt":"2026-10-05T12:12:07","guid":{"rendered":"http:\/\/runda-hitech.com\/?page_id=50"},"modified":"2026-10-05T21:09:39","modified_gmt":"2026-10-05T13:09:39","slug":"safety-relief-valves","status":"publish","type":"page","link":"https:\/\/runda-hitech.com\/index.php\/products\/valves\/safety-relief-valves\/","title":{"rendered":"Safety &#038; Relief Valves &#8211; SRVL and SRVH Instrument Series"},"content":{"rendered":"\n<div class=\"wp-block-cover alignfull rlok-hero\" style=\"min-height:430px;aspect-ratio:unset;\"><span aria-hidden=\"true\" class=\"wp-block-cover__background has-background-dim\"><\/span><img decoding=\"async\" class=\"wp-block-cover__image-background\" alt=\"\" src=\"http:\/\/runda-hitech.com\/wp-content\/uploads\/2026\/10\/r-lok-hero-background.jpg\" data-object-fit=\"cover\"\/><div class=\"wp-block-cover__inner-container has-global-padding is-layout-constrained wp-block-cover-is-layout-constrained\">\n<h1 class=\"wp-block-heading\">Safety &amp; Relief Valves &#8211; SRVL and SRVH Instrument Series<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">R-LOK safety and relief valves protect instrument tubing, gauges, analysers, sampling lines and small-bore hydraulic circuits from overpressure. SRVL covers 10 to 250 psig (0.69 to 17.2 bar); SRVH covers 225 to 6,000 psig (15.5 to 414 bar). Bodies are ASTM A182 F316 stainless steel, with ends from 1\/4 in (6.35 mm) tube to 1\/2 NPT. We supply them as your sourcing partner.<\/p>\n\n\n\n<div class=\"wp-block-buttons is-layout-flex wp-block-buttons-is-layout-flex\">\n<div class=\"wp-block-button\"><a class=\"wp-block-button__link wp-element-button\" href=\"\/index.php\/contact\/\">Request a quote<\/a><\/div>\n\n<div class=\"wp-block-button is-style-outline\"><a class=\"wp-block-button__link wp-element-button\" href=\"\/index.php\/products\/\">Browse products<\/a><\/div>\n<\/div>\n<\/div><\/div>\n\n\n\n<div class=\"wp-block-group rlok-body has-global-padding is-layout-constrained wp-container-core-group-is-layout-b8954cbe wp-block-group-is-layout-constrained\" style=\"border-radius:0px\">\n<p class=\"wp-block-paragraph\"><span class=\"rlok-fallback-nav\"><a href=\"\/index.php\/products\/\">Products<\/a> &nbsp;&middot;&nbsp; <a href=\"\/index.php\/applications\/\">Applications<\/a> &nbsp;&middot;&nbsp; <a href=\"\/index.php\/quality\/\">Quality<\/a> &nbsp;&middot;&nbsp; <a href=\"\/index.php\/resources\/\">Resources<\/a> &nbsp;&middot;&nbsp; <a href=\"\/index.php\/about\/\">About<\/a> &nbsp;&middot;&nbsp; <a href=\"\/index.php\/contact\/\">Contact<\/a><\/span><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><span class=\"rlok-bc\"><a href=\"\/index.php\/\">Home<\/a> &rsaquo; <a href=\"\/index.php\/products\/\">Products<\/a> &rsaquo; <a href=\"\/index.php\/products\/valves\/\">Instrumentation Valves<\/a> &rsaquo; <strong>Safety &amp; Relief Valves<\/strong><\/span><\/p>\n\n\n\n<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-6ac5c474 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<h3 class=\"wp-block-heading\">Key features<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>SRVL covers 10-250 psig (0.69-17.2 bar); SRVH covers 225-6,000 psig (15.5-414 bar).<\/li>\n\n<li>Orifice 4.8 mm (0.19 in) on SRVL and 3.6 mm (0.14 in) on SRVH.<\/li>\n\n<li>Body to ASTM A182 F316; trim to ASTM A479; spring in S17700 stainless steel.<\/li>\n\n<li>Set pressure adjusts externally; lock nut and wire-lock hole secure the setting.<\/li>\n\n<li>Viton O-rings; PTFE seat gasket on SRVL; polypropylene adjuster plug.<\/li>\n\n<li>Ends: 1\/4-1\/2 in and 6-12 mm tube, 1\/4-1\/2 NPT male or female.<\/li>\n<\/ul>\n<\/div>\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<h3 class=\"wp-block-heading\">Specifications<\/h3>\n\n\n\n<figure class=\"wp-block-table is-style-stripes\"><table><thead><tr><th>Parameter<\/th><th>Value<\/th><\/tr><\/thead><tbody><tr><td>Set pressure, SRVL<\/td><td>10 to 250 psig (0.69 to 17.2 bar); maximum 300 psig (20.6 bar)<\/td><\/tr><tr><td>Set pressure, SRVH<\/td><td>225 to 6,000 psig (15.5 to 414 bar)<\/td><\/tr><tr><td>Orifice diameter<\/td><td>4.8 mm (0.19 in) SRVL; 3.6 mm (0.14 in) SRVH<\/td><\/tr><tr><td>Spring codes<\/td><td>blank 10-225 (SRVL), Y, P, O, B, W, R, G<\/td><\/tr><tr><td>Body<\/td><td>ASTM A182 F316 stainless steel (code SS); spring S17700 (17-7 PH)<\/td><\/tr><tr><td>Internals<\/td><td>316 stainless steel to ASTM A479; polypropylene plug<\/td><\/tr><tr><td>Seals<\/td><td>Viton O-rings; PTFE seat gasket on SRVL<\/td><\/tr><tr><td>End connections<\/td><td>1\/4, 3\/8, 1\/2 in and 6, 8, 12 mm tube; 1\/4, 3\/8, 1\/2 NPT<\/td><\/tr><\/tbody><\/table><\/figure>\n<\/div>\n<\/div>\n\n\n\n<h2 class=\"wp-block-heading\">How these valves work<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Both series are direct-acting, spring-loaded relief valves. System pressure acts on a small poppet held closed by a spring. When pressure reaches the set point, the spring compresses, the poppet lifts and overpressure vents through the outlet port.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Opening pressure is adjusted externally with the spring adjuster and held by a lock nut. A wire-lock hole secures the setting on vibrating skids. Re-test the valve after any field adjustment, because the set point moves with the spring position.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">SRVL and SRVH pressure ranges<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">SRVL is the low-pressure valve: 300 psig (20.6 bar) maximum working pressure, set pressure 10 to 250 psig (0.69 to 17.2 bar), one adjustable spring covering the 10 to 225 psig band, 4.8 mm (0.19 in) orifice.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">SRVH is the high-pressure valve: 6,000 psig (414 bar) maximum working pressure, set pressure 225 to 6,000 psig (15.5 to 414 bar), 3.6 mm (0.14 in) orifice. Eight spring codes cover the range in bands.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Materials, seals and connections<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The body is 316 stainless steel to ASTM A182 F316 (code SS); internal parts are 316 stainless steel to ASTM A479; the spring is S17700 (17-7 PH). Sealing uses Viton O-rings, and SRVL adds a PTFE seat gasket.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Ends are ferrule tube fittings, male or female NPT, in mixed combinations. Standard sizes are 1\/4, 3\/8 and 1\/2 in tube, 6, 8 and 12 mm tube, and 1\/4, 3\/8 and 1\/2 NPT.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Standards referenced:<\/strong> Body material specified as ASTM A182 F316 stainless steel.; Internal parts specified to ASTM A479 (316 stainless steel bar).; NPT ends threaded to ASME B1.20.1; tube ends use the R-LOK ferrule system..<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Typical duties:<\/strong> Instrument air and gas distribution panels; Gauge, transmitter and analyser protection; Sampling systems and chemical injection skids; Small-bore hydraulic and pneumatic circuits; Blocked-in liquid lines needing thermal relief; High-purity and specialty gas panels.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Safety and relief valve model selection guide (SRVL \/ SRVH series)<\/h2>\n\n\n\n<figure class=\"wp-block-table is-style-stripes\"><table><thead><tr><th>Series \/ model<\/th><th>Size<\/th><th>Connection<\/th><th>Working pressure<\/th><th>Body material<\/th><th>Seat \/ packing<\/th><th>Notes<\/th><\/tr><\/thead><tbody><tr><td>SRVL low-pressure safety valve (S4)<\/td><td>4.8 mm bore (SRVL)<\/td><td>1\/4&quot; tube fitting in \/ 1\/4&quot; tube fitting out (code S4)<\/td><td>Max. working pressure 300psig(20.6bar); opening pressure 10psig to 250psig(0.69bar to 17.2bar)<\/td><td>SS = ASTM A182 F316 stainless steel<\/td><td>Sealing washer PTFE; valve seat 316 stainless\/A479; O-ring VITON<\/td><td>Dimensions L1 38.7 mm x L2 37.3 mm x H 104.6 mm; one spring covers the full 10-250psig adjustment range; spring colour blue<\/td><\/tr><tr><td>SRVL low-pressure safety valve (S6M)<\/td><td>4.8 mm bore (SRVL)<\/td><td>6 mm tube fitting in \/ 6 mm tube fitting out (code S6M)<\/td><td>Max. working pressure 300psig(20.6bar); opening pressure 10psig to 250psig(0.69bar to 17.2bar)<\/td><td>SS = ASTM A182 F316 stainless steel<\/td><td>Sealing washer PTFE; valve seat 316 stainless\/A479; O-ring VITON<\/td><td>Dimensions L1 38.7 mm x L2 37.3 mm x H 104.6 mm<\/td><\/tr><tr><td>SRVL low-pressure safety valve (S8M)<\/td><td>4.8 mm bore (SRVL)<\/td><td>8 mm tube fitting in \/ 8 mm tube fitting out (code S8M)<\/td><td>Max. working pressure 300psig(20.6bar); opening pressure 10psig to 250psig(0.69bar to 17.2bar)<\/td><td>SS = ASTM A182 F316 stainless steel<\/td><td>Sealing washer PTFE; valve seat 316 stainless\/A479; O-ring VITON<\/td><td>Dimensions L1 38.7 mm x L2 37.3 mm x H 104.6 mm<\/td><\/tr><tr><td>SRVL low-pressure safety valve (S6)<\/td><td>4.8 mm bore (SRVL)<\/td><td>3\/8&quot; tube fitting in \/ 3\/8&quot; tube fitting out (code S6)<\/td><td>Max. working pressure 300psig(20.6bar); opening pressure 10psig to 250psig(0.69bar to 17.2bar)<\/td><td>SS = ASTM A182 F316 stainless steel<\/td><td>Sealing washer PTFE; valve seat 316 stainless\/A479; O-ring VITON<\/td><td>Dimensions L1 44.4 mm x L2 44.4 mm x H 111.7 mm<\/td><\/tr><tr><td>SRVL low-pressure safety valve (S8)<\/td><td>4.8 mm bore (SRVL)<\/td><td>1\/2&quot; tube fitting in \/ 1\/2&quot; tube fitting out (code S8)<\/td><td>Max. working pressure 300psig(20.6bar); opening pressure 10psig to 250psig(0.69bar to 17.2bar)<\/td><td>SS = ASTM A182 F316 stainless steel<\/td><td>Sealing washer PTFE; valve seat 316 stainless\/A479; O-ring VITON<\/td><td>Dimensions L1 46.7 mm x L2 46.7 mm x H 114.0 mm<\/td><\/tr><tr><td>SRVL low-pressure safety valve (S12M)<\/td><td>4.8 mm bore (SRVL)<\/td><td>12 mm tube fitting in \/ 12 mm tube fitting out (code S12M)<\/td><td>Max. working pressure 300psig(20.6bar); opening pressure 10psig to 250psig(0.69bar to 17.2bar)<\/td><td>SS = ASTM A182 F316 stainless steel<\/td><td>Sealing washer PTFE; valve seat 316 stainless\/A479; O-ring VITON<\/td><td>Dimensions L1 46.7 mm x L2 46.7 mm x H 114.0 mm<\/td><\/tr><tr><td>SRVL low-pressure safety valve (M8N x S8)<\/td><td>4.8 mm bore (SRVL)<\/td><td>1\/2 NPT male thread in \/ 1\/2&quot; tube fitting out (code M8N-S8)<\/td><td>Max. working pressure 300psig(20.6bar); opening pressure 10psig to 250psig(0.69bar to 17.2bar)<\/td><td>SS = ASTM A182 F316 stainless steel<\/td><td>Sealing washer PTFE; valve seat 316 stainless\/A479; O-ring VITON<\/td><td>Dimensions L1 46.7 mm x L2 35.7 mm x H 103.0 mm<\/td><\/tr><tr><td>SRVL low-pressure safety valve (M8N x S12M)<\/td><td>4.8 mm bore (SRVL)<\/td><td>1\/2 NPT male thread in \/ 12 mm tube fitting out (code M8N-S12M)<\/td><td>Max. working pressure 300psig(20.6bar); opening pressure 10psig to 250psig(0.69bar to 17.2bar)<\/td><td>SS = ASTM A182 F316 stainless steel<\/td><td>Sealing washer PTFE; valve seat 316 stainless\/A479; O-ring VITON<\/td><td>Dimensions L1 46.7 mm x L2 35.7 mm x H 103.0 mm<\/td><\/tr><tr><td>SRVL low-pressure safety valve (M4N x F4N)<\/td><td>4.8 mm bore (SRVL)<\/td><td>1\/4 NPT male thread in \/ 1\/4 NPT female thread out (code M4N-F4N)<\/td><td>Max. working pressure 300psig(20.6bar); opening pressure 10psig to 250psig(0.69bar to 17.2bar)<\/td><td>SS = ASTM A182 F316 stainless steel<\/td><td>Sealing washer PTFE; valve seat 316 stainless\/A479; O-ring VITON<\/td><td>Dimensions L1 30.0 mm x L2 32.2 mm x H 99.5 mm<\/td><\/tr><tr><td>SRVL low-pressure safety valve (M6N x F6N)<\/td><td>4.8 mm bore (SRVL)<\/td><td>3\/8 NPT male thread in \/ 3\/8 NPT female thread out (code M6N-F6N)<\/td><td>Max. working pressure 300psig(20.6bar); opening pressure 10psig to 250psig(0.69bar to 17.2bar)<\/td><td>SS = ASTM A182 F316 stainless steel<\/td><td>Sealing washer PTFE; valve seat 316 stainless\/A479; O-ring VITON<\/td><td>Dimensions L1 34.5 mm x L2 32.2 mm x H 99.5 mm<\/td><\/tr><tr><td>SRVL low-pressure safety valve (M8N x F8N)<\/td><td>4.8 mm bore (SRVL)<\/td><td>1\/2 NPT male thread in \/ 1\/2 NPT female thread out (code M8N-F8N)<\/td><td>Max. working pressure 300psig(20.6bar); opening pressure 10psig to 250psig(0.69bar to 17.2bar)<\/td><td>SS = ASTM A182 F316 stainless steel<\/td><td>Sealing washer PTFE; valve seat 316 stainless\/A479; O-ring VITON<\/td><td>Dimensions L1 38.0 mm x L2 35.7 mm x H 103.0 mm<\/td><\/tr><tr><td>SRVH high-pressure safety valve &#8211; spring code Y<\/td><td>3.6 mm bore (SRVH)<\/td><td>Same body \/ end-connection options as the shared SRVL-SRVH size table (codes S4 to M8N-F8N)<\/td><td>Max. working pressure 6000psig(414bar); opening pressure 225psig to 6000psig(15.5bar to 414bar)<\/td><td>SS = ASTM A182 F316 stainless steel<\/td><td>Valve seat 316 stainless\/A479; O-ring VITON; seal ring VITON; stem 316 stainless\/A479; no packing material published<\/td><td>Spring code Y covers 225-750psig; order code format SRVH-M8N-S8-Y-SS; set pressure locked by a socket set screw<\/td><\/tr><tr><td>SRVH high-pressure safety valve &#8211; spring code P<\/td><td>3.6 mm bore (SRVH)<\/td><td>Same body \/ end-connection options as the shared SRVL-SRVH size table (codes S4 to M8N-F8N)<\/td><td>Max. working pressure 6000psig(414bar); opening pressure 225psig to 6000psig(15.5bar to 414bar)<\/td><td>SS = ASTM A182 F316 stainless steel<\/td><td>Valve seat 316 stainless\/A479; O-ring VITON; seal ring VITON; stem 316 stainless\/A479; no packing material published<\/td><td>Spring code P covers 750-1500psig<\/td><\/tr><tr><td>SRVH high-pressure safety valve &#8211; spring code O<\/td><td>3.6 mm bore (SRVH)<\/td><td>Same body \/ end-connection options as the shared SRVL-SRVH size table (codes S4 to M8N-F8N)<\/td><td>Max. working pressure 6000psig(414bar); opening pressure 225psig to 6000psig(15.5bar to 414bar)<\/td><td>SS = ASTM A182 F316 stainless steel<\/td><td>Valve seat 316 stainless\/A479; O-ring VITON; seal ring VITON; stem 316 stainless\/A479; no packing material published<\/td><td>Spring code O covers 1500-2250psig<\/td><\/tr><tr><td>SRVH high-pressure safety valve &#8211; spring code B<\/td><td>3.6 mm bore (SRVH)<\/td><td>Same body \/ end-connection options as the shared SRVL-SRVH size table (codes S4 to M8N-F8N)<\/td><td>Max. working pressure 6000psig(414bar); opening pressure 225psig to 6000psig(15.5bar to 414bar)<\/td><td>SS = ASTM A182 F316 stainless steel<\/td><td>Valve seat 316 stainless\/A479; O-ring VITON; seal ring VITON; stem 316 stainless\/A479; no packing material published<\/td><td>Spring code B covers 2250-3000psig<\/td><\/tr><tr><td>SRVH high-pressure safety valve &#8211; spring code W \/ R \/ G<\/td><td>3.6 mm bore (SRVH)<\/td><td>Same body \/ end-connection options as the shared SRVL-SRVH size table (codes S4 to M8N-F8N)<\/td><td>Max. working pressure 6000psig(414bar); opening pressure 225psig to 6000psig(15.5bar to 414bar)<\/td><td>SS = ASTM A182 F316 stainless steel<\/td><td>Valve seat 316 stainless\/A479; O-ring VITON; seal ring VITON; stem 316 stainless\/A479; no packing material published<\/td><td>Spring code W 3000-4000psig, R 4000-5000psig, G 5000-6000psig<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Selection notes:<\/strong> Model selections and figures are taken from the catalogue ordering table (\u8ba2\u8d2d\u4fe1\u606f, page 11-22) and the size table (\u5c3a\u5bf8\u8868, page 11-21) of the safety valve section that begins on catalogue pages 11-19 and 11-20. The catalogue prints these valves in one shared size table for the low-pressure SRVL series (bore 4.8 mm) and the high-pressure SRVH series (bore 3.6 mm); every size code listed there can be ordered in either series.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><em>Catalogue reference 11-19, 11-20, 11-21, 11-22. Confirm the final rating against the data sheet issued with your order.<\/em><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>See also:<\/strong> <a href=\"\/index.php\/products\/valves\/ball-valves\/\">Ball Valves<\/a> &middot; <a href=\"\/index.php\/products\/valves\/check-valves\/\">Check Valves<\/a> &middot; <a href=\"\/index.php\/products\/valves\/diaphragm-valves\/\">Diaphragm Valves<\/a> &middot; <a href=\"\/index.php\/products\/valves\/gauge-valves-manifolds\/\">Gauge Valves Manifolds<\/a> &middot; <a href=\"\/index.php\/products\/valves\/needle-valves\/\">Needle Valves<\/a> &middot; <a href=\"\/index.php\/products\/valves\/plug-valves\/\">Plug Valves<\/a> &middot; <a href=\"\/index.php\/products\/valves\/pressure-regulators\/\">Pressure Regulators<\/a> &middot; <a href=\"\/index.php\/products\/valves\/purge-bleed-valves\/\">Purge Bleed Valves<\/a><\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Frequently asked questions<\/h2>\n\n\n\n<details class=\"wp-block-details is-layout-flow wp-block-details-is-layout-flow\"><summary>Can the set pressure be adjusted after installation?<\/summary>\n<p class=\"wp-block-paragraph\">Yes. Opening pressure is adjusted externally with the spring adjuster and locked with a lock nut; a wire-lock hole secures the setting. Re-test the valve after adjustment, because the set point moves with the spring position.<\/p>\n<\/details>\n\n\n\n<details class=\"wp-block-details is-layout-flow wp-block-details-is-layout-flow\"><summary>How do I choose between SRVL and SRVH?<\/summary>\n<p class=\"wp-block-paragraph\">Choose from the set pressure. SRVL covers 10 to 250 psig (0.69 to 17.2 bar), 4.8 mm orifice; SRVH covers 225 to 6,000 psig (15.5 to 414 bar), 3.6 mm orifice. Send set pressure, reseal pressure, fluid and connections; we confirm the series and code.<\/p>\n<\/details>\n\n\n\n<details class=\"wp-block-details is-layout-flow wp-block-details-is-layout-flow\"><summary>What documents come with the valves?<\/summary>\n<p class=\"wp-block-paragraph\">Material certificates for the body and internal parts can be supplied with the shipment on request. Tell us the certificate type, the standard you work to and any third-party inspection requirement in your enquiry so we can confirm it before we quote.<\/p>\n<\/details>\n<\/div>\n\n\n\n<div class=\"wp-block-group alignfull rlok-cta has-global-padding is-layout-constrained wp-container-core-group-is-layout-c4390f02 wp-block-group-is-layout-constrained\" style=\"border-radius:0px\">\n<div class=\"wp-block-group has-global-padding is-layout-constrained wp-container-core-group-is-layout-b097105c wp-block-group-is-layout-constrained\" style=\"border-radius:0px\">\n<h2 class=\"wp-block-heading\">Request a quote or technical clarification<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Send us the model, size, material and quantity you need &mdash; or a photo of the existing part. We reply with a quotation, availability and the applicable documents, usually within one working day.<\/p>\n\n\n\n<div class=\"wp-block-buttons is-layout-flex wp-block-buttons-is-layout-flex\">\n<div class=\"wp-block-button\"><a class=\"wp-block-button__link wp-element-button\" href=\"mailto:nimo@runda-hitech.com\">Email nimo@runda-hitech.com<\/a><\/div>\n\n<div class=\"wp-block-button is-style-outline\"><a class=\"wp-block-button__link wp-element-button\" href=\"https:\/\/wa.me\/8613657416007\">WhatsApp +86 136 5741 6007<\/a><\/div>\n<\/div>\n\n\n\n<p class=\"wp-block-paragraph\">Tel \/ WhatsApp: +86 136 5741 6007 &middot; Email: nimo@runda-hitech.com<\/p>\n<\/div>\n<\/div>\n\n\n\n<style>img{max-width:100%;height:auto}.wp-block-table{max-width:100%}.rlok-bc{display:block;font-size:13px;letter-spacing:.01em;color:#5a6b7d;margin:0 0 26px}.rlok-bc a{color:#0b2545;text-decoration:none}.rlok-bc a:hover{color:#c8102e;text-decoration:underline}.rlok-bc strong{color:#0b2545}.rlok-fallback-nav{display:block;border-bottom:1px solid #dde3ea;padding-bottom:12px;margin:0 0 18px;font-size:14.5px;font-weight:600}.rlok-fallback-nav a{color:#0b2545;text-decoration:none}.rlok-fallback-nav a:hover{color:#c8102e;text-decoration:underline}@media (max-width:782px){.rlok-hero{min-height:330px!important;padding-left:18px!important;padding-right:18px!important}.rlok-hero h1{font-size:26px;line-height:1.22}.rlok-hero p{font-size:15.5px}.rlok-body{padding:30px 18px 12px!important}.rlok-cta{padding:38px 18px!important}.rlok-cta h2{font-size:22px}.rlok-bc{font-size:12.5px;margin-bottom:18px}.wp-block-table{display:block;overflow-x:auto;-webkit-overflow-scrolling:touch}.wp-block-table table{min-width:520px;font-size:13px}.wp-block-table th,.wp-block-table td{padding:7px 9px}.wp-block-columns{gap:1.1rem;margin-bottom:1.3rem}.wp-block-button{width:100%}.wp-block-button__link{width:100%;text-align:center}h2.wp-block-heading{font-size:22px}h3.wp-block-heading{font-size:19px}.wp-block-details{padding:12px 14px}}<\/style><script type=\"application\/ld+json\">{\"@context\": \"https:\/\/schema.org\", \"@type\": \"BreadcrumbList\", \"itemListElement\": [{\"@type\": \"ListItem\", \"position\": 1, \"name\": \"Home\", \"item\": \"http:\/\/runda-hitech.com\/\"}, {\"@type\": \"ListItem\", \"position\": 2, \"name\": \"Products\", \"item\": \"http:\/\/runda-hitech.com\/products\/\"}, {\"@type\": \"ListItem\", \"position\": 3, \"name\": \"Instrumentation Valves\", \"item\": \"http:\/\/runda-hitech.com\/products\/valves\/\"}, {\"@type\": \"ListItem\", \"position\": 4, \"name\": \"Safety & Relief Valves\", \"item\": \"http:\/\/runda-hitech.com\/products\/valves\/safety-relief-valves\/\"}]}<\/script>\n\n\n<!-- VERIFY BEFORE PUBLISHING: Confirm the maximum working temperature for SRVL and SRVH. Catalogue pages 11-19 to 11-22 list Viton and PTFE seals but publish no temperature rating for this series. | Confirm whether a set-pressure test record or certificate can be issued with each valve, and in what format. | Confirm whether material certificates (for example EN 10204 3.1) for the ASTM A182 F316 body and ASTM A479 trim can be supplied, and at what cost. | The product photos on catalogue page 11-19 are marked SS-RV26A-K8N and SS-RRV26A-K6F, which do not match the SRVL\/SRVH ordering code on page 11-22. Confirm which numbering is current and whether RV26A is an older series. | Confirm whether a Cv or a certified relieving capacity can be quoted for the 4.8 mm and 3.6 mm orifices; the catalogue gives orifice diameter only. | Confirm whether these valves are approved for liquid thermal-relief service or intended for gas and vapour only. -->\n\n<!-- build: slug=safety-relief-valves type=category keywords=safety relief valve supplier, instrument relief valve 316 stainless steel, SRVH high pressure safety valve 6000 psi, SRVL low pressure relief valve exporter, adjustable set pressure relief valve, 1\/2 in tube fitting safety valve, NPT relief valve for instrument panel, spring loaded relief valve China supplier, small bore thermal relief valve, wire lock safety valve for sampling system -->","protected":false},"excerpt":{"rendered":"<p>Instrument safety relief valves for export: SRVL 10-250 psig, SRVH 225-6,000 psig, ASTM A182 F316 body, tube or NPT ends. 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