{"id":1105,"date":"2022-04-09T07:25:21","date_gmt":"2022-04-08T23:25:21","guid":{"rendered":"https:\/\/www.pansvalve.com\/?post_type=products&#038;p=1105"},"modified":"2026-04-15T15:24:44","modified_gmt":"2026-04-15T07:24:44","slug":"trunnion-ball-valve","status":"publish","type":"products","link":"https:\/\/www.pansvalve.com\/pt\/products\/trunnion-ball-valve\/","title":{"rendered":"V\u00e1lvula de esfera munh\u00e3o"},"content":{"rendered":"<p class=\"wp-block-paragraph\">Design de porta completa, BB, corpo dividido, corpo de tr\u00eas pe\u00e7as para 12 \u2033 e acima, tipo esfera montada em munh\u00e3o, haste \u00e0 prova de explos\u00e3o, constru\u00e7\u00e3o resistente ao fogo, dispositivo antiest\u00e1tico, almofada de montagem ISO 5211, extremidades flangeadas ou BW, dispon\u00edveis com Operador de GT.<\/p>\n\n\n\n<h2 class=\"wp-block-heading has-black-color has-text-color has-medium-font-size\"><strong>Aplicativo<\/strong><strong><\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">As v\u00e1lvulas esfera munh\u00e3o s\u00e3o adequadas para uso em v\u00e1rios tipos de tubula\u00e7\u00f5es da Classe 150<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">~ Classe2500, PN16 ~ PN160, JIS10K ~ JIS20Kpara cortar ou ligar o meio da tubula\u00e7\u00e3o, cujos tipos de opera\u00e7\u00e3o incluem engrenagem helicoidal, atuadores manuais, pneum\u00e1ticos ou el\u00e9tricos, sendo em geral de conex\u00e3o de flange, e tamb\u00e9m de conex\u00e3o de extremidades soldadas.<\/p>\n\n\n\n<h2 class=\"wp-block-heading has-black-color has-text-color has-medium-font-size\"><strong>Dispositivo de inje\u00e7\u00e3o de graxa urgente<\/strong><strong><\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">De acordo com a exig\u00eancia do cliente, as v\u00e1lvulas esfera munh\u00e3o fabricadas pela empresa Zhedong s\u00e3o fornecidas com dispositivos para inje\u00e7\u00e3o urgente de graxa, que est\u00e3o na haste e na sede para as v\u00e1lvulas esfera munh\u00e3o de DN&gt; 150mm (NPS6), e na cavidade do corpo para a v\u00e1lvula de DN &lt;125mm. Quando o O-ring da haste ou o anel da sede do corpo s\u00e3o danificados devido a um acidente, o vazamento m\u00e9dio entre o corpo e a haste pode ser evitado injetando-se a graxa de veda\u00e7\u00e3o atrav\u00e9s do dispositivo.<\/p>\n\n\n\n<h2 class=\"wp-block-heading has-black-color has-text-color has-medium-font-size\"><strong>Fun\u00e7\u00f5es de bloqueio duplo e sangramento<\/strong><strong><\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Em geral, a v\u00e1lvula de esfera munh\u00e3o Zhedong apresenta a estrutura de projeto de veda\u00e7\u00e3o de esfera frontal. Cada sede da v\u00e1lvula esf\u00e9rica pode cortar separadamente o meio na entrada e na sa\u00edda da v\u00e1lvula para realizar fun\u00e7\u00f5es de bloqueio duplo. Quando a v\u00e1lvula esf\u00e9rica est\u00e1 fechada, a cavidade do corpo e duas extremidades do corpo podem ser bloqueadas uma com a outra, mesmo que a entrada e a sa\u00edda estejam sob press\u00e3o, quando o meio deixado na cavidade do corpo pode ser sangrado atrav\u00e9s da v\u00e1lvula de al\u00edvio.<\/p>\n\n\n\n<h2 class=\"wp-block-heading has-black-color has-text-color has-medium-font-size\"><strong>Haste \u00e0 prova de explos\u00e3o<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u00c9 fornecida estrutura \u00e0 prova de explos\u00e3o para a haste, que \u00e9 posicionada pela tampa superior e parafuso, garantindo que n\u00e3o ser\u00e1 soprada pelo meio, mesmo que haja aumento anormal de press\u00e3o na cavidade.<\/p>\n\n\n\n<h2 class=\"wp-block-heading has-black-color has-text-color has-medium-font-size\"><strong>A estrutura do projeto de bi-selagem. Ou seja, veda\u00e7\u00e3o da sede na frente da esfera e veda\u00e7\u00e3o da sede atr\u00e1s da esfera<\/strong><strong><\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">De acordo com algumas condi\u00e7\u00f5es de trabalho especiais e requisitos dos clientes, Zhedong forneceu a v\u00e1lvula de esfera munh\u00e3o com a estrutura de design de bi-veda\u00e7\u00e3o, ou seja, veda\u00e7\u00e3o da sede na frente da esfera e veda\u00e7\u00e3o da sede atr\u00e1s da esfera, garantindo assim a veda\u00e7\u00e3o confi\u00e1vel da v\u00e1lvula porque a v\u00e1lvula pode funcionar normalmente mesmo se um dos designs de veda\u00e7\u00e3o eficazes for perdido devido \u00e0 condi\u00e7\u00e3o anormal.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Em rela\u00e7\u00e3o ao assento na frente da esfera, o efeito do pist\u00e3o formado pela diferen\u00e7a de \u00e1rea entre D1 e D2, mais a for\u00e7a pr\u00e9-apertada de uma mola faria com que o assento na frente da esfera fosse pela diferen\u00e7a de press\u00e3o do meio antes e depois do a v\u00e1lvula toque a esfera de perto para formar a estanqueidade, cuja for\u00e7a de veda\u00e7\u00e3o se tornar\u00e1 maior \u00e0 medida que a diferen\u00e7a de press\u00e3o aumentar.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Com rela\u00e7\u00e3o \u00e0 sede ap\u00f3s a esfera, o efeito pist\u00e3o formado pela diferen\u00e7a de \u00e1rea entre D2 e D3, somado \u00e0 for\u00e7a de pr\u00e9-tensionamento de uma mola, faria com que a sede atr\u00e1s da esfera a tocasse de perto, formando a veda\u00e7\u00e3o, cuja for\u00e7a de veda\u00e7\u00e3o aumentaria conforme a diferen\u00e7a de press\u00e3o aumentasse.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large\"><img decoding=\"async\" data-src=\"https:\/\/www.pansvalve.com\/wp-content\/uploads\/2022\/04\/12.02-1-1024x636.jpg\" src=\"data:image\/gif;base64,R0lGODlhAQABAIAAAAAAAP\/\/\/yH5BAEAAAAALAAAAAABAAEAAAIBRAA7\" alt=\"\" class=\"wp-image-1264 lazyload\"\/><noscript><img decoding=\"async\" src=\"https:\/\/www.pansvalve.com\/wp-content\/uploads\/2022\/04\/12.02-1-1024x636.jpg\" alt=\"\" class=\"wp-image-1264\"><\/noscript><figcaption class=\"wp-element-caption\">V\u00e1lvula de esfera munh\u00e3o de a\u00e7o fundido de tr\u00eas pe\u00e7as<\/figcaption><\/figure>\n<\/div>\n\n\n<h2 class=\"wp-block-heading has-black-color has-text-color has-medium-font-size\"><strong>Design antiest\u00e1tico<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">A esfera da v\u00e1lvula de esfera do munh\u00e3o entra em contato pr\u00f3ximo entre si atrav\u00e9s do munh\u00e3o, da almofada de ajuste e da tampa inferior, a passagem da eletricidade est\u00e1tica se forma junto com a v\u00e1lvula, o que pode levar \u00e0 eletricidade est\u00e1tica causada por fa\u00edscas geradas pelo atrito entre o bola e assento durante o desempenho ligado e desligado no solo para evitar o poss\u00edvel risco de inc\u00eandio ou explos\u00e3o.<\/p>\n\n\n\n<h2 class=\"wp-block-heading has-black-color has-text-color has-medium-font-size\"><strong>Auto-al\u00edvio na cavidade corporal<\/strong><strong><\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u00c0 medida que o meio l\u00edquido deixado na cavidade do corpo gaseifica devido ao aumento da temperatura, a press\u00e3o na cavidade do corpo torna-se anormalmente mais alta, quando o pr\u00f3prio meio na cavidade impulsiona a sede e alivia a press\u00e3o para garantir a seguran\u00e7a da v\u00e1lvula.<\/p>\n\n\n\n<h2 class=\"wp-block-heading has-black-color has-text-color has-medium-font-size\"><strong>Projeto seguro contra inc\u00eandio<\/strong><strong><\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Com a v\u00e1lvula aquecida em uma aplica\u00e7\u00e3o contra inc\u00eandio, as pe\u00e7as de material n\u00e3o met\u00e1lico, como o anel de veda\u00e7\u00e3o da sede de PTFE, o anel O da haste e a junta de veda\u00e7\u00e3o do corpo e do castelo, podem ser danificadas devido \u00e0 alta temperatura. O design especial de Zhedong de metal auxiliar com metal ou veda\u00e7\u00e3o de grafite \u00e9 fornecido para a v\u00e1lvula de esfera munh\u00e3o para evitar efetivamente vazamentos internos e externos da v\u00e1lvula. Conforme exigido pelos clientes, o projeto \u00e0 prova de fogo da Zhedong para a v\u00e1lvula de esfera munh\u00e3o atende aos requisitos da API 607, API 6Fa, BS 6755 e JB\/T 6899.<\/p>\n\n\n\n<style>\n    .pans-faq-container {\n        font-family: Arial, sans-serif;\n        max-width: 100%;\n        margin: 20px auto;\n        padding: 10px;\n    }\n\n    .pans-faq-title {\n        color: #D70C19;\n        font-size: 24px;\n        margin-bottom: 25px;\n        border-left: 5px solid #D70C19;\n        padding-left: 15px;\n    }\n\n    .faq-item {\n        background: #ffffff;\n        border-radius: 8px;\n        padding: 20px;\n        margin-bottom: 15px;\n        box-shadow: 0 2px 5px rgba(0,0,0,0.1);\n        transition: transform 0.3s ease, box-shadow 0.3s ease;\n        border: 1px solid #eee;\n    }\n\n    \/* Hover Effect for Professional Feel *\/\n    .faq-item:hover {\n        transform: translateY(-5px);\n        box-shadow: 0 10px 20px rgba(0,0,0,0.12);\n        border-color: #D70C19;\n    }\n\n    .faq-question {\n        color: #666666;\n        font-weight: bold;\n        font-size: 18px;\n        margin-bottom: 10px;\n        display: flex;\n        align-items: flex-start;\n    }\n\n    .faq-question span {\n        color: #D70C19;\n        margin-right: 10px;\n    }\n\n    .faq-answer {\n        color: #333333;\n        line-height: 1.6;\n        font-size: 16px;\n    }\n\n    \/* Responsive Adjustments *\/\n    @media (max-width: 768px) {\n        .pans-faq-title { font-size: 20px; }\n        .faq-question { font-size: 16px; }\n        .faq-answer { font-size: 14px; }\n        .faq-item { padding: 15px; }\n    }\n<\/style>\n\n<div class=\"pans-faq-container\" itemscope itemtype=\"https:\/\/schema.org\/FAQPage\">\n    <h2 class=\"pans-faq-title\">Perguntas frequentes sobre v\u00e1lvulas de esfera com munh\u00e3o<\/h2>\n\n    <div class=\"faq-item\" itemscope itemprop=\"mainEntity\" itemtype=\"https:\/\/schema.org\/Question\">\n        <div class=\"faq-question\" itemprop=\"name\"><span>1.<\/span> Para que serve uma v\u00e1lvula de esfera com munh\u00e3o?<\/div>\n        <div class=\"faq-answer\" itemscope itemprop=\"acceptedAnswer\" itemtype=\"https:\/\/schema.org\/Answer\">\n            <div itemprop=\"text\">Uma v\u00e1lvula de esfera com munh\u00e3o \u00e9 utilizada para servi\u00e7os de abertura\/fechamento de alta press\u00e3o e grande di\u00e2metro em oleodutos e gasodutos, GNL, petroqu\u00edmica e usinas de energia. Ela proporciona fechamento confi\u00e1vel, baixo torque de opera\u00e7\u00e3o e longa vida \u00fatil em linhas de processo cr\u00edticas.<\/div>\n        <\/div>\n    <\/div>\n\n    <div class=\"faq-item\" itemscope itemprop=\"mainEntity\" itemtype=\"https:\/\/schema.org\/Question\">\n        <div class=\"faq-question\" itemprop=\"name\"><span>2.<\/span> Quais s\u00e3o as principais vantagens de uma v\u00e1lvula de esfera com montagem em munh\u00e3o?<\/div>\n        <div class=\"faq-answer\" itemscope itemprop=\"acceptedAnswer\" itemtype=\"https:\/\/schema.org\/Answer\">\n            <div itemprop=\"text\">As principais vantagens incluem o suporte mec\u00e2nico da esfera por meio de munh\u00f5es, carga reduzida na sede, menor torque de opera\u00e7\u00e3o, desempenho est\u00e1vel sob alta press\u00e3o e adequa\u00e7\u00e3o para aplica\u00e7\u00f5es de grande porte e alta press\u00e3o. Essas v\u00e1lvulas s\u00e3o especialmente indicadas para projetos de dutos e plataformas offshore.<\/div>\n        <\/div>\n    <\/div>\n\n    <div class=\"faq-item\" itemscope itemprop=\"mainEntity\" itemtype=\"https:\/\/schema.org\/Question\">\n        <div class=\"faq-question\" itemprop=\"name\"><span>3.<\/span> Em quais aplica\u00e7\u00f5es as v\u00e1lvulas de esfera com munh\u00e3o s\u00e3o preferidas em rela\u00e7\u00e3o \u00e0s v\u00e1lvulas de esfera flutuantes?<\/div>\n        <div class=\"faq-answer\" itemscope itemprop=\"acceptedAnswer\" itemtype=\"https:\/\/schema.org\/Answer\">\n            <div itemprop=\"text\">As v\u00e1lvulas de esfera flutuantes s\u00e3o normalmente utilizadas em aplica\u00e7\u00f5es de m\u00e9dia press\u00e3o e pequeno a m\u00e9dio porte, como em sistemas de \u00e1gua, produtos qu\u00edmicos e servi\u00e7os industriais em geral. J\u00e1 as v\u00e1lvulas de esfera com munh\u00e3o s\u00e3o preferidas para tubula\u00e7\u00f5es de alta press\u00e3o e grande di\u00e2metro, como as utilizadas em sistemas de transmiss\u00e3o de petr\u00f3leo e g\u00e1s, GNL e processos cr\u00edticos.<\/div>\n        <\/div>\n    <\/div>\n\n    <div class=\"faq-item\" itemscope itemprop=\"mainEntity\" itemtype=\"https:\/\/schema.org\/Question\">\n        <div class=\"faq-question\" itemprop=\"name\"><span>4.<\/span> Quais s\u00e3o os materiais comumente usados para v\u00e1lvulas de esfera com munh\u00e3o?<\/div>\n        <div class=\"faq-answer\" itemscope itemprop=\"acceptedAnswer\" itemtype=\"https:\/\/schema.org\/Answer\">\n            <div itemprop=\"text\">Os materiais comuns para o corpo incluem a\u00e7o carbono (A105, WCB, WCC), a\u00e7o inoxid\u00e1vel (CF8, CF8M, F316, etc.) e a\u00e7os-liga de alta resist\u00eancia. As sedes e veda\u00e7\u00f5es podem ser macias (PTFE, PEEK, etc.) ou metal-metal, dependendo do fluido, da temperatura e dos requisitos de emiss\u00e3o.<\/div>\n        <\/div>\n    <\/div>\n\n    <div class=\"faq-item\" itemscope itemprop=\"mainEntity\" itemtype=\"https:\/\/schema.org\/Question\">\n        <div class=\"faq-question\" itemprop=\"name\"><span>5.<\/span> Quais s\u00e3o as faixas de press\u00e3o e tamanho t\u00edpicas para v\u00e1lvulas de esfera com munh\u00e3o?<\/div>\n        <div class=\"faq-answer\" itemscope itemprop=\"acceptedAnswer\" itemtype=\"https:\/\/schema.org\/Answer\">\n            <div itemprop=\"text\">As classifica\u00e7\u00f5es de press\u00e3o t\u00edpicas abrangem as classes ASME 150 at\u00e9 2500 (ou equivalente PN), com di\u00e2metros NPS de 1&quot; a 48&quot; (DN25 a DN1200) comumente dispon\u00edveis. Os projetos com montagem em munh\u00e3o s\u00e3o especialmente comuns para tamanhos maiores e press\u00f5es mais elevadas.<\/div>\n        <\/div>\n    <\/div>\n\n    <div class=\"faq-item\" itemscope itemprop=\"mainEntity\" itemtype=\"https:\/\/schema.org\/Question\">\n        <div class=\"faq-question\" itemprop=\"name\"><span>6.<\/span> Qual \u00e9 o valor fundamental da sua empresa?<\/div>\n        <div class=\"faq-answer\" itemscope itemprop=\"acceptedAnswer\" itemtype=\"https:\/\/schema.org\/Answer\">\n            <div itemprop=\"text\">Nosso foco \u00e9 ser um &quot;Fabricante de V\u00e1lvulas Industriais Completo&quot;, fornecendo os produtos de maior valor e um servi\u00e7o que beneficia tanto a todos.<\/div>\n        <\/div>\n    <\/div>\n<\/div>\n\n\n\n<a href=\"https:\/\/www.pansvalve.com\/pt\/contact-us\/\" target=\"_blank\" rel=\"noopener noreferrer\" class=\"b2b-cta-btn\">\n    Solicite um or\u00e7amento\n<\/a>\n\n<style>\n    \/* High-Conversion Button Styling *\/\n    .b2b-cta-btn {\n        display: inline-block; \/* Crucial: Makes the link behave like a block button *\/\n        background-color: #D70C19;\n        color: #FFFFFF!important;\n        border: 2px solid #D70C19; \n        padding: 14px 32px;\n        font-size: 16px;\n        font-weight: 600;\n        font-family: Arial, sans-serif;\n        text-align: center;\n        text-transform: uppercase; \n        border-radius: 4px; \n        cursor: pointer;\n        transition: all 0.3s ease-in-out; \n        box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);\n        text-decoration: none; \/* Removes the default hyperlink underline *\/\n    }\n\n    \/* Hover Reversal State *\/\n    .b2b-cta-btn:hover {\n        background-color: #FFFFFF;\n        color: #D70C19!important;\n        box-shadow: 0 6px 12px rgba(215, 12, 25, 0.2); \n        text-decoration: none; \/* Ensures underline stays hidden on hover *\/\n    }\n\n    \/* Active Click State *\/\n    .b2b-cta-btn:active {\n        transform: translateY(2px);\n        box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);\n    }\n<\/style>\n\n\n\n<div style=\"height:30px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large is-resized\"><img decoding=\"async\" data-src=\"https:\/\/www.pansvalve.com\/wp-content\/uploads\/2022\/04\/\u957f\u56fe_\u9875\u9762_1-1-1024x973.jpg\" src=\"data:image\/gif;base64,R0lGODlhAQABAIAAAAAAAP\/\/\/yH5BAEAAAAALAAAAAABAAEAAAIBRAA7\" alt=\"\" class=\"wp-image-1206 lazyload\" style=\"width:1104px;height:1049px\"\/><noscript><img decoding=\"async\" src=\"https:\/\/www.pansvalve.com\/wp-content\/uploads\/2022\/04\/\u957f\u56fe_\u9875\u9762_1-1-1024x973.jpg\" alt=\"\" class=\"wp-image-1206\" style=\"width:1104px;height:1049px\"><\/noscript><\/figure>\n<\/div>\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large is-resized\"><img decoding=\"async\" data-src=\"https:\/\/www.pansvalve.com\/wp-content\/uploads\/2022\/04\/\u957f\u56fe_\u9875\u9762_2-1-791x1024.jpg\" src=\"data:image\/gif;base64,R0lGODlhAQABAIAAAAAAAP\/\/\/yH5BAEAAAAALAAAAAABAAEAAAIBRAA7\" alt=\"\" class=\"wp-image-1207 lazyload\" style=\"width:1105px;height:1430px\"\/><noscript><img decoding=\"async\" src=\"https:\/\/www.pansvalve.com\/wp-content\/uploads\/2022\/04\/\u957f\u56fe_\u9875\u9762_2-1-791x1024.jpg\" alt=\"\" class=\"wp-image-1207\" style=\"width:1105px;height:1430px\"><\/noscript><\/figure>\n<\/div>\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large is-resized\"><img decoding=\"async\" data-src=\"https:\/\/www.pansvalve.com\/wp-content\/uploads\/2022\/04\/\u957f\u56fe_\u9875\u9762_3-1-1024x811.jpg\" src=\"data:image\/gif;base64,R0lGODlhAQABAIAAAAAAAP\/\/\/yH5BAEAAAAALAAAAAABAAEAAAIBRAA7\" alt=\"\" class=\"wp-image-1208 lazyload\" style=\"width:1108px;height:877px\"\/><noscript><img decoding=\"async\" src=\"https:\/\/www.pansvalve.com\/wp-content\/uploads\/2022\/04\/\u957f\u56fe_\u9875\u9762_3-1-1024x811.jpg\" alt=\"\" class=\"wp-image-1208\" style=\"width:1108px;height:877px\"><\/noscript><\/figure>\n<\/div>","protected":false},"excerpt":{"rendered":"<p>Full port design,BB,Split body,three piece body for 12&#8243; and above,trunnion mounted ball type,blow-out proof stem, fire durable construction, anti-static device, ISO 5211 mounting pad, flanged or BW ends, available with WG operator. Application Trunnion ball valves are suitable for use on various kinds of pipelines of Class 150 ~ Class2500, PN16 ~ PN160, JIS10K ~ [&hellip;]<\/p>\n","protected":false},"featured_media":0,"menu_order":0,"comment_status":"open","ping_status":"closed","template":"","meta":[],"product":[151,168],"class_list":["post-1105","products","type-products","status-publish","hentry","product-ball-valve","product-trunnion-ball-valve"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.2 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Trunnion Ball Valve | Industrial Valve Manufacturer Pans<\/title>\n<meta name=\"description\" content=\"Discover high-quality trunnion ball valves from a trusted China factory. Designed for industrial applications, featuring double-block and bleed, fire-safe construction, and anti-static design. Customizable with manual, pneumatic, or electric actuators. Durable, leak-resistant, and customer-focused solutions.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.pansvalve.com\/pt\/products\/trunnion-ball-valve\/\" \/>\n<meta property=\"og:locale\" content=\"pt_PT\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Trunnion Ball Valve | Industrial Valve Manufacturer Pans\" \/>\n<meta property=\"og:description\" content=\"Discover high-quality trunnion ball valves from a trusted China factory. Designed for industrial applications, featuring double-block and bleed, fire-safe construction, and anti-static design. Customizable with manual, pneumatic, or electric actuators. 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