\u00a0\u0443\u043f\u043b\u043e\u0442\u043d\u0438\u0442\u0435\u043b\u044c\u043d\u044b\u0439 \u043c\u0430\u0442\u0435\u0440\u0438\u0430\u043b \uff1a<\/b><\/strong><\/p>\nRubber (EPDM, NBR, etc.): used for water, air and other non-corrosive media.<\/p>\n
Polytetrafluoroethylene (PTFE): corrosion resistant, high temperature resistant, suitable for chemical media.<\/p>\n
Metal sealing (stainless steel, alloy): high temperature and high pressure resistant, used for triple eccentric butterfly valves.<\/p>\n
Nominal bore (DN) and pressure class<\/p>\n
Piping diameter: match the inner diameter of the pipe to avoid excessive flow rate resulting in wear or noise.<\/p>\n
Pressure rating: Select according to the maximum working pressure of the system (e.g. PN10, PN16, Class150, etc.).<\/p>\n
<\/p>\n
How to operate<\/h2>\n
Manual operation: suitable for small diameter (DN\u2264300) or occasions that do not require frequent operation.<\/p>\n
Electric actuator: used for automated control or remote operation (requires matching torque).<\/p>\n
Pneumatic actuators: suitable for explosion-proof environments or rapid opening and closing requirements (e.g., compressed air systems).<\/p>\n
Hydraulic actuators: used for high torque, large diameter valves (e.g., hydropower stations).<\/p>\n
<\/p>\n
Sealing class requirements<\/h2>\n
Leakage level (e.g. ISO 5208 standard):<\/b><\/strong><\/p>\nCenterline butterfly valves are usually Class VI (allowing slight leakage).<\/p>\n
Triple eccentric butterfly valves can be Class V or zero leakage (metal hard seal).<\/p>\n
Special sealing requirements: such as food grade, vacuum sealing, fire protection design, etc.<\/p>\n
<\/p>\n
Installation and maintenance<\/h2>\n
Installation space: flange spacing should be reserved for wafer-type butterfly valves, and bolt operation space should be considered for flange type.<\/p>\n
Maintenance convenience: the structure of the center line butterfly valves is simple and easy to maintain, and the three eccentric butterfly valve has a long life but complex maintenance.<\/p>\n
Flow direction: some butterfly valves have flow direction restrictions (such as double eccentric, triple eccentric type).<\/p>\n
<\/p>\n
Industry standards and certification<\/h2>\n
\u00a0standard specification \uff1a<\/b><\/strong><\/p>\nNational standard (GB), American standard (API 609, ANSI), European standard (EN), Japanese standard (JIS).<\/p>\n
Industry certification:<\/b><\/strong><\/p>\nFire protection (FM\/UL), drinking water (NSF), explosion-proof (ATEX), petrochemical (API), etc.<\/p>\n
<\/p>\n
Economic evaluation<\/h2>\n
Under the premise of meeting the performance, the initial purchase cost, maintenance cost and life cycle cost are comprehensively compared.<\/p>\n
For example, the three eccentric butterfly valve has high initial cost, but long service life, suitable for long-term operation in harsh working conditions.<\/p>\n
<\/p>\n
Typical selection examples<\/h2>\n
Water treatment system (at room temperature and pressure): central line butterfly valve (EPDM seal) + cast iron valve body.<\/p>\n
Chemical pipeline (corrosive medium): flanged three eccentric butterfly valve (316 stainless steel body +PTFE seal).<\/p>\n
Steam system (high temperature and high pressure): three eccentric metal sealing butterfly valves + electric actuator.<\/p>\n
<\/p>\n
Notes<\/h2>\n
Avoid butterfly valves for high viscosity media (e.g. asphalt) or media containing a large number of solid particles (easy to block).<\/p>\n
Large diameter butterfly valve needs to check the strength of the valve stem and actuator torque.<\/p>\n
In the throttling condition, cavitation and vibration risks should be considered.<\/p>\n
<\/p>\n
Through the systematic analysis of the above steps, the selection of butterfly valve can be ensured to meet the actual needs, taking into account performance, reliability and economy.<\/p>\n
<\/p>","protected":false},"excerpt":{"rendered":"
Butterfly valves selection:Determine the application conditions \u00a0media characteristics \uff1a Fluid type (gas, liquid, particle\/corrosive medium, etc.). The temperature, viscosity and corrosiveness of the medium (such as acid, alkali, oil, steam, etc.). Working pressure and temperature range: Determine the maximum working pressure (PN\/Class) and temperature (high, normal or low). Metal sealing butterfly valves should be selected […]<\/p>","protected":false},"author":2,"featured_media":5047,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-5550","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"acf":[],"_links":{"self":[{"href":"https:\/\/tops-valve.com\/ru\/wp-json\/wp\/v2\/posts\/5550","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/tops-valve.com\/ru\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/tops-valve.com\/ru\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/tops-valve.com\/ru\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/tops-valve.com\/ru\/wp-json\/wp\/v2\/comments?post=5550"}],"version-history":[{"count":1,"href":"https:\/\/tops-valve.com\/ru\/wp-json\/wp\/v2\/posts\/5550\/revisions"}],"predecessor-version":[{"id":5551,"href":"https:\/\/tops-valve.com\/ru\/wp-json\/wp\/v2\/posts\/5550\/revisions\/5551"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/tops-valve.com\/ru\/wp-json\/wp\/v2\/media\/5047"}],"wp:attachment":[{"href":"https:\/\/tops-valve.com\/ru\/wp-json\/wp\/v2\/media?parent=5550"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/tops-valve.com\/ru\/wp-json\/wp\/v2\/categories?post=5550"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/tops-valve.com\/ru\/wp-json\/wp\/v2\/tags?post=5550"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}