{"id":569,"date":"2026-07-13T06:54:10","date_gmt":"2026-07-13T06:54:10","guid":{"rendered":"https:\/\/www.xvs-valve.com\/?post_type=xvs_news&p=569"},"modified":"2026-07-13T06:54:11","modified_gmt":"2026-07-13T06:54:11","slug":"%d8%a7%d8%aa%d8%ac%d8%a7%d9%87-%d8%aa%d8%b1%d9%83%d9%8a%d8%a8-%d8%a7%d9%84%d8%b5%d9%85%d8%a7%d9%85","status":"publish","type":"xvs_news","link":"https:\/\/www.xvs-valve.com\/ar\/xvs_news\/valve-installation-direction\/","title":{"rendered":"\u0645\u0627 \u0647\u064a \u0627\u0644\u0642\u0648\u0627\u0639\u062f \u0627\u0644\u062a\u064a \u064a\u062c\u0628 \u0627\u062a\u0628\u0627\u0639\u0647\u0627 \u0641\u064a\u0645\u0627 \u064a\u062a\u0639\u0644\u0642 \u0628\u0627\u062a\u062c\u0627\u0647 \u062a\u0631\u0643\u064a\u0628 \u0627\u0644\u0635\u0645\u0627\u0645\u061f"},"content":{"rendered":"

Most installers take it for granted that the arrow on valve body only stands for medium flow direction. If \u0627\u0644\u0635\u0645\u0627\u0645\u0627\u062a<\/a> are installed merely based on this misunderstanding, reverse installation will easily lead to internal leakage. Bi-directional sealing and clearance sealing valves have no flow arrows. However, arrows on valves with different structures carry totally different meanings. This article sorts out arrow definitions and installation standards of mainstream valves.<\/p>\n\n\n\n

Correct Installation Standards for All Types of Valves<\/h2>\n\n\n\n

\u0641\u062d\u0635 \u0627\u0644\u0635\u0645\u0627\u0645<\/h3>\n\n\n\n

The arrow on check valve indicates the allowable medium flow direction. Valves must be installed strictly following medium flow; reverse installation will completely block medium circulation.<\/p>\n\n\n\n

Globe Valve & Throttle Valve<\/h3>\n\n\n\n

Single disc type: The arrow marks medium flow path, normally medium enters from bottom and exits from top. Forward fitting is recommended. Although reverse fitting may achieve better sealing temporarily, excessive pressure difference will result in unopenable valves or broken valve stems. Consult manufacturers for maximum allowable pressure difference. Double disc type: The arrow represents medium sealing orientation, normally high-pressure inlet and low-pressure outlet. Fitting shall comply with arrow marks. It may keep sealing under low pressure difference, while sealing performance will fail completely under high pressure difference.<\/p>\n\n\n\n

\u0635\u0645\u0627\u0645 \u0627\u0644\u0641\u0631\u0627\u0634\u0629<\/h3>\n\n\n\n

Concentric, single-eccentric, double-eccentric and triple-eccentric butterfly valves all take arrows as sealing direction. Strict forward installation is required; reverse mounting will cause continuous medium leakage.<\/p>\n\n\n\n

Triple Rod Valve<\/h3>\n\n\n\n

The arrow on triple rod valve stands for medium sealing orientation. Reverse fitting is forbidden, which will trigger sealing failure and constant leakage.<\/p>\n\n\n\n

Safety Valve<\/h3>\n\n\n\n

The arrow on safety valve marks allowable medium flow direction, matching pipeline pressure relief flow.<\/p>\n\n\n\n

\u0635\u0645\u0627\u0645 \u0627\u0644\u062a\u062d\u0643\u0645<\/h3>\n\n\n\n

Single-seat control valve: Arrow shows medium flow path with standard bottom-in top-out structure. Forward fitting is preferred. Reverse sealing works temporarily, yet high pressure difference will cause valve blocking and stem damage. Confirm maximum pressure difference with manufacturers in advance.<\/p>\n\n\n\n

Sleeve control valve: Arrow refers to sealing direction with high-pressure inlet and low-pressure outlet. Reverse installation is prohibited for total loss of sealing capacity. <\/p>\n\n\n\n

Special structure control valve: Arrow marks sealing direction. It can maintain temporary sealing under low pressure difference but leak heavily when pressure difference rises. Verify working pressure parameters before selection.<\/p>\n\n\n\n

Ball Valve<\/h3>\n\n\n\n

Floating ball valve adopts standard bi-directional sealing without fixed flow direction. Trunnion ball valve with arrow marks supports one-way sealing, and bi-directional sealing types are also available.<\/p>\n\n\n

\n
\"Valve
Valve Installation Direction Indication<\/figcaption><\/figure>\n<\/div>\n\n\n

The End of The Article<\/h2>\n\n\n\n

Arrows on valves fall into two categories: medium flow direction and medium sealing direction. Sealing arrows indicate medium flows from high-pressure side to low-pressure side when valves are closed, so one-way sealing valves have strict installation requirements.<\/p>\n\n\n\n

Special valves for air separation equipment such as molecular sieve switching valves, liquid oxygen pump outlet valves, expander outlet valves and series backup pump outlet valves shall be installed according to actual process conditions. Except for check valves, reverse installation of valves with sealing arrows will directly destroy sealing structure. Confirm proper installation direction with process engineers before construction.<\/p>\n\n\n\n

Cooperate with a reliable professional valve manufacturer to eliminate hidden dangers including leakage and malfunction caused by wrong valve installation, ensuring long-term stable operation of the whole fluid system. Safe and stable process pipelines rely on properly selected and correctly installed high-quality valves.<\/p>\n\n\n

\n
\"Installation\"
Valve Direction Indication<\/figcaption><\/figure>\n<\/div>\n\n\n

\u0635\u0645\u0627\u0645 XVS<\/a> devotes itself to R&D and mass production of various industrial valves. We strictly comply with domestic and international manufacturing & testing standards, carrying out refined control over the whole process including valve casting, sealing processing and factory flow arrow inspection. We supply industrial valves with wide working condition adaptability, stable sealing performance and clear installation marks.<\/p>\n\n\n\n

If you want to avoid internal leakage and valve damage due to wrong installation direction, and acquire professional working condition selection, installation technical training and complete after-sales service during procurement, feel free to contact us for cooperation. \u3010Consult Us Now<\/a> \u3011to get accurate quotation, customized selection scheme and one-stop service covering valve selection, delivery and technical guidance!<\/p>\n\n\n\n

<\/p>","protected":false},"excerpt":{"rendered":"

Most installers take it for granted that the arrow on valve body only stands for medium flow direction. If valves are installed merely based on this misunderstanding, reverse installation will easily lead to internal leakage. Bi-directional sealing and clearance sealing valves have no flow arrows. However, arrows on valves with different structures carry totally different […]<\/p>\n","protected":false},"featured_media":570,"template":"","categories":[15],"class_list":["post-569","xvs_news","type-xvs_news","status-publish","has-post-thumbnail","hentry","category-tech-insights"],"acf":[],"_links":{"self":[{"href":"https:\/\/www.xvs-valve.com\/ar\/wp-json\/wp\/v2\/xvs_news\/569","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.xvs-valve.com\/ar\/wp-json\/wp\/v2\/xvs_news"}],"about":[{"href":"https:\/\/www.xvs-valve.com\/ar\/wp-json\/wp\/v2\/types\/xvs_news"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.xvs-valve.com\/ar\/wp-json\/wp\/v2\/media\/570"}],"wp:attachment":[{"href":"https:\/\/www.xvs-valve.com\/ar\/wp-json\/wp\/v2\/media?parent=569"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.xvs-valve.com\/ar\/wp-json\/wp\/v2\/categories?post=569"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}