{"id":72,"date":"2026-10-05T20:14:54","date_gmt":"2026-10-05T12:14:54","guid":{"rendered":"http:\/\/runda-hitech.com\/?page_id=72"},"modified":"2026-10-05T21:09:37","modified_gmt":"2026-10-05T13:09:37","slug":"petrochemical","status":"publish","type":"page","link":"https:\/\/runda-hitech.com\/index.php\/applications\/petrochemical\/","title":{"rendered":"Petrochemical &#038; Chemical Plant Instrumentation"},"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\">Petrochemical &amp; Chemical Plant Instrumentation<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Refinery and chemical process lines carry hydrocarbons, sour gas, amine, caustic and steam, often hot and under vibration. CHANGSHA RUNDA HITECH CO., LTD. supplies needle, ball, gauge, manifold, check and safety valves, filters and fittings for isolation, throttling, venting and pressure reduction. Bodies are 316 or 316L stainless steel, connections 1\/16 to 1 in with NPT or BSPP\/BSPT threads, pressures to 6,000 psi (413 bar).<\/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\/applications\/\">Applications<\/a> &rsaquo; <strong>Petrochemical<\/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>Needle, ball, gauge, manifold, check, plug, purge, bleed and safety valves from one supplier.<\/li>\n\n<li>2-, 3- and 5-valve manifolds, direct-mount and remote-mount, for DP transmitters.<\/li>\n\n<li>316 or 316L bodies to ASTM A276 or A479; alloys on request.<\/li>\n\n<li>Packing: PTFE to 500 F, PEEK to 600 F, graphite to 1,200 F (648 C).<\/li>\n\n<li>Working pressure to 6,000 psi (413 bar), derated for temperature and packing.<\/li>\n\n<li>Threads to ASME B1.20.1 (NPT) and ISO 7-1 (BSPT, BSPP), 1\/8 to 1 in.<\/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>Body material<\/td><td>316 or 316L stainless steel to ASTM A276 or A479; alloy 400, 20, 600 and C-276 on request<\/td><\/tr><tr><td>Size range<\/td><td>tube fittings 1\/16 to 1 in (1.6 to 25.4 mm); threaded ends 1\/8 to 1 in and 6 to 20 mm metric<\/td><\/tr><tr><td>Working pressure<\/td><td>to 6,000 psi (413 bar) at ambient, lower as temperature and packing change the rating<\/td><\/tr><tr><td>Packing<\/td><td>PTFE -65 to 500 F (-54 to 260 C), PEEK to 600 F (315 C), graphite to 1,200 F (648 C)<\/td><\/tr><tr><td>Seat and stem<\/td><td>metal-to-metal seat, hardened 316 stainless tip, non-rotating manifold stems, back seat<\/td><\/tr><tr><td>Gaskets<\/td><td>Viton -20 to 450 F (-29 to 232 C), PTFE -65 to 250 F (-54 to 121 C), graphite to 1,000 F (538 C)<\/td><\/tr><tr><td>Manifolds<\/td><td>2-, 3- and 5-valve direct-mount and remote-mount; 1\/2 in NPT female ports, 1\/4 in NPT vent<\/td><\/tr><tr><td>Instrument port<\/td><td>1\/2 in NPT female on gauge valves, straight (SGBV) and angle (SGRV); bore 3.2 and 6.4 mm<\/td><\/tr><\/tbody><\/table><\/figure>\n<\/div>\n<\/div>\n\n\n\n<h2 class=\"wp-block-heading\">Service conditions that set the specification<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Fluid chemistry decides the specification before line pressure. Hydrocarbon, caustic, amine and wet acid gas streams attack different parts of one valve: the seat, stem tip, packing and body gasket. State the fluid, its concentration and whether water is present.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Temperature is the second constraint. Steam-traced lines run hot, then cool. PTFE packing suits lines to 500 \u00b0F (260 \u00b0C), PEEK reaches 600 \u00b0F (315 \u00b0C) and graphite covers 1,200 \u00b0F (648 \u00b0C). Body pressure falls as temperature rises.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Isolation, manifolds and loop accessories<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Bar-stock needle valves handle isolation, venting and throttling on impulse and gauge lines; ball valves give quarter-turn shutoff; plug, purge and bleed valves release trapped volume. Check valves stop reverse flow and safety valves protect small-bore sections.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Gauge valves come in straight (SGBV) and angle (SGRV) patterns with a 1\/2 in NPT female port. Manifolds combine isolate, vent and equalise functions: 2-valve, 3-valve for differential pressure transmitters and 5-valve, in direct-mount and remote-mount patterns.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Materials, filters and ordering<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Inline filters with 0.5 to 90 micron sintered 316 stainless elements sit upstream of analysers and flow meters. Regulators hold instrument air, nitrogen and sample pressure, and double-ferrule, threaded and weld fittings form the impulse tubing.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">R-LOK quotes a model code, price and delivery date. Material certificates with heat numbers, dimensional inspection reports, test records and a certificate of origin are supplied on request. Manifolds are nitrogen tested before dispatch.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Standards referenced:<\/strong> Pressure and temperature ratings referenced to ASME B16.34 practice for valves where the project specification requires it; Impulse tubing and small-bore piping practice referenced to ASME B31.3; Sour-service material selection referenced to NACE MR0175 \/ ISO 15156 where the medium and specification call for it.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Typical duties:<\/strong> Crude, vacuum and hydrotreating unit instrument lines; Catalytic cracking, reforming and alkylation instrumentation; Amine, glycol and caustic dosing circuits; Steam, condensate and steam-traced impulse lines; Analyser houses and sampling panels; Instrument air, nitrogen and hydraulic supply skids.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Recommended product families<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><a href=\"\/index.php\/products\/valves\/needle-valves\/\">Needle Valves<\/a><\/li>\n\n<li><a href=\"\/index.php\/products\/valves\/ball-valves\/\">Ball Valves<\/a><\/li>\n\n<li><a href=\"\/index.php\/products\/valves\/gauge-valves-manifolds\/\">Gauge Valves &amp; Manifolds<\/a><\/li>\n\n<li><a href=\"\/index.php\/products\/tube-fittings\/double-ferrule-fittings\/\">Double Ferrule Fittings<\/a><\/li>\n\n<li><a href=\"\/index.php\/products\/fluid-control-accessories\/hoses-hose-fittings\/\">Hose Assemblies<\/a><\/li>\n<\/ul>\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>How do I choose packing and seat material for hot hydrocarbon service?<\/summary>\n<p class=\"wp-block-paragraph\">Start from the maximum continuous temperature and the fluid. PTFE packing covers service to 500 F (260 C) and suits most hydrocarbon lines. PEEK extends the range to 600 F (315 C). Graphite suits steam-traced lines to 1,200 F (648 C).<\/p>\n<\/details>\n\n\n\n<details class=\"wp-block-details is-layout-flow wp-block-details-is-layout-flow\"><summary>Can you supply NPT and BSPP threads in the same order?<\/summary>\n<p class=\"wp-block-paragraph\">Yes. NPT ends follow ASME B1.20.1 with size codes 2N to 16N, and BSPT or BSPP ends follow ISO 7-1 with codes 2R to 16R. Metric tube ends use 6 mm to 20 mm codes. Both families are supplied in the same body.<\/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 an export order?<\/summary>\n<p class=\"wp-block-paragraph\">On request we issue material certificates with heat numbers, dimensional inspection reports and test records, plus a certificate of origin. Manifolds are nitrogen pressure tested before dispatch. Name the document list in your purchase order.<\/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\": \"Applications\", \"item\": \"http:\/\/runda-hitech.com\/applications\/\"}, {\"@type\": \"ListItem\", \"position\": 3, \"name\": \"Petrochemical\", \"item\": \"http:\/\/runda-hitech.com\/applications\/petrochemical\/\"}]}<\/script>\n\n\n<!-- VERIFY BEFORE PUBLISHING: Confirm that no quality system, product or material certificate is named anywhere on this page unless RUNDA actually holds it; the page references design standards only and must not be read as an R-LOK certification claim. | Confirm that alloy 400, alloy 20, alloy 600 and alloy C-276 bodies can genuinely be sourced from the catalogue supplier, and state the lead time and minimum quantity for each. | Confirm whether wetted parts of needle, gauge and manifold valves are offered in 316L as standard or only on request, since the page promises 316L for welded and high-purity sections. | Confirm the published pressure rating figure and unit conversion. The brief uses 6,000 psi (413 bar) while the gauge valve and manifold page in the same site uses 414 bar; only one value should be published site-wide. | Confirm whether materials for sour service can be supplied to NACE MR0175 \/ ISO 15156 with documented hardness testing, before any sour-service supply is promised to a buyer. | Confirm that nitrogen pressure testing of manifolds is carried out on every unit and that a test record naming the acceptance limit can be issued per order. | Confirm that mill certificates to EN 10204 3.1 are available for valve and fitting bodies, and whether they are included in the price or charged separately. | Confirm the graphite packing temperature limit of 1,200 \u00b0F (648 \u00b0C) against the packing actually supplied, and the maximum temperature for the standard gasket set. | Confirm typical minimum order quantity, lead times for catalogue items versus configured assemblies, and the accepted Incoterms and payment terms, so the FAQ answers can state firm figures instead of per-enquiry wording. | Confirm that catalogue model codes (for example SGBV, SGRV, SM3V, SIF series) may be published on the company website. -->\n\n<!-- build: slug=petrochemical type=industry keywords=petrochemical instrument valve supplier, refinery instrumentation tube fittings exporter, 3-valve manifold for differential pressure transmitter, 316L needle valve for chemical plant, graphite packing needle valve high temperature, NPT and BSPP instrument valve supplier China, sour service instrument valves supplier, analyser sampling system valves and filters, instrument hook-up assembly supplier Middle East, safety relief valve for chemical process line, chemical sampling hose assembly exporter -->","protected":false},"excerpt":{"rendered":"<p>Instrument valves, manifolds, filters and fittings for refinery and chemical process units. 316L, NPT or BSPP, to 6,000 psi (413 bar). Request a quote.<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":28,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-72","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/runda-hitech.com\/index.php\/wp-json\/wp\/v2\/pages\/72","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/runda-hitech.com\/index.php\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/runda-hitech.com\/index.php\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/runda-hitech.com\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/runda-hitech.com\/index.php\/wp-json\/wp\/v2\/comments?post=72"}],"version-history":[{"count":9,"href":"https:\/\/runda-hitech.com\/index.php\/wp-json\/wp\/v2\/pages\/72\/revisions"}],"predecessor-version":[{"id":426,"href":"https:\/\/runda-hitech.com\/index.php\/wp-json\/wp\/v2\/pages\/72\/revisions\/426"}],"up":[{"embeddable":true,"href":"https:\/\/runda-hitech.com\/index.php\/wp-json\/wp\/v2\/pages\/28"}],"wp:attachment":[{"href":"https:\/\/runda-hitech.com\/index.php\/wp-json\/wp\/v2\/media?parent=72"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}