{"id":121,"date":"2026-10-18T10:00:00","date_gmt":"2026-10-18T06:30:00","guid":{"rendered":"https:\/\/sanatiblog.ir\/blog\/pneumatic-solenoid-valves\/"},"modified":"2026-10-18T10:00:00","modified_gmt":"2026-10-18T06:30:00","slug":"pneumatic-solenoid-valves","status":"publish","type":"post","link":"https:\/\/sanatiblog.ir\/fa\/blog\/pneumatic-solenoid-valves\/","title":{"rendered":"\u0634\u06cc\u0631 \u0628\u0631\u0642\u06cc \u067e\u0646\u0648\u0645\u0627\u062a\u06cc\u06a9: \u06f3\/\u06f2\u060c \u06f5\/\u06f2 \u06cc\u0627 \u06f5\/\u06f3\u061f"},"content":{"rendered":"<p>A solenoid valve is an electric switch for air: power on the coil, and the air goes a different way. The numbers on it tell you what it can do.<\/p>\n<h2>Reading the numbers<\/h2>\n<p>The first number is the ports (holes), the second is the positions.<\/p>\n<ul>\n<li><strong>3\/2:<\/strong> for a single acting cylinder (air out, spring back), or to switch an air supply on and off.<\/li>\n<li><strong>5\/2:<\/strong> for a double acting cylinder: air pushes it out, then pushes it back. The most common.<\/li>\n<li><strong>5\/3:<\/strong> like 5\/2 with a middle position, so the cylinder can stop halfway, or hold still when the power fails.<\/li>\n<\/ul>\n<h2>One coil or two<\/h2>\n<p>A <strong>single solenoid<\/strong> valve has a spring: when the power goes off, it goes back to its rest position. A <strong>double solenoid<\/strong> valve stays where it was until the other coil gets power. It &#8220;remembers&#8221;. Choose on purpose: think about what the machine should do if the power fails.<\/p>\n<h2>Coil voltage and size<\/h2>\n<p>24 V DC is the usual choice with a PLC; 220 V AC in older panels. Port size (1\/8, 1\/4 inch&#8230;) follows the cylinder&#8217;s size. A manual button on the valve is useful for testing.<\/p>\n<h2>Water and gas valves are different<\/h2>\n<p>Many solenoid valves for water are &#8220;pilot operated&#8221;: they need a minimum pressure difference (often about 0.3\u20130.5 bar) to open. On a tank with low pressure, ask for a direct acting valve. Also say if it should be closed or open without power (NC or NO).<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u0627\u06cc\u0646 \u0639\u062f\u062f\u0647\u0627 \u06cc\u0639\u0646\u06cc \u0686\u0647\u060c \u062a\u06a9\u200c\u0628\u0648\u0628\u06cc\u0646 \u06cc\u0627 \u062f\u0648\u0628\u0648\u0628\u06cc\u0646\u060c \u0648 \u0648\u0644\u062a\u0627\u0698 \u0628\u0648\u0628\u06cc\u0646.<\/p>\n","protected":false},"author":0,"featured_media":136,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-121","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-uncategorized"],"_links":{"self":[{"href":"https:\/\/sanatiblog.ir\/fa\/wp-json\/wp\/v2\/posts\/121","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/sanatiblog.ir\/fa\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/sanatiblog.ir\/fa\/wp-json\/wp\/v2\/types\/post"}],"replies":[{"embeddable":true,"href":"https:\/\/sanatiblog.ir\/fa\/wp-json\/wp\/v2\/comments?post=121"}],"version-history":[{"count":0,"href":"https:\/\/sanatiblog.ir\/fa\/wp-json\/wp\/v2\/posts\/121\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/sanatiblog.ir\/fa\/wp-json\/wp\/v2\/media\/136"}],"wp:attachment":[{"href":"https:\/\/sanatiblog.ir\/fa\/wp-json\/wp\/v2\/media?parent=121"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/sanatiblog.ir\/fa\/wp-json\/wp\/v2\/categories?post=121"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/sanatiblog.ir\/fa\/wp-json\/wp\/v2\/tags?post=121"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}