{"id":5548,"date":"2025-09-28T09:20:30","date_gmt":"2025-09-28T09:20:30","guid":{"rendered":"https:\/\/tops-valve.com\/?p=5548"},"modified":"2025-09-28T09:20:30","modified_gmt":"2025-09-28T09:20:30","slug":"principles-and-steps-of-valves-ball-valve-selection","status":"publish","type":"post","link":"https:\/\/tops-valve.com\/es\/principles-and-steps-of-valves-ball-valve-selection\/","title":{"rendered":"Principios y etapas de la selecci\u00f3n de v\u00e1lvulas de bola"},"content":{"rendered":"

Principles of valves ball valve selection<\/h1>\n

media characteristics<\/h3>\n
Corrosion resistance: select corrosion-resistant materials (such as 316L stainless steel, Hastelloy) according to the chemical properties of the medium (such as acid, alkali, organic solvent).<\/div>\n
Cleanliness: hard sealing (metal to metal) or a specially designed anti-clogging structure should be selected for particles or high viscosity media.<\/div>\n
Phase: gas, liquid, or gas-liquid mixture medium needs to be designed for sealing and structure.<\/div>\n

working condition<\/h3>\n
Pressure: high pressure (PN\u226516MPa) should select a fixed ball valve, and low pressure can select a floating ball valve.<\/div>\n
Temperature: high temperature (> 200\u2103) requires metal sealing, low temperature (<-50\u2103) requires cryogenic treatment materials (such as austenitic stainless steel).<\/div>\n
Flow characteristics: Full port ball valve (Full Port) is used for applications requiring low flow resistance, and reduced port ball valve (Reduced Port) is used for applications where pressure loss is allowed.<\/div>\n

Valve materials<\/h3>\n
Material del cuerpo de la v\u00e1lvula:<\/div>\n
Ordinary working conditions: cast steel (WCB), stainless steel (CF8\/CF8M).<\/div>\n
Strong corrosion: duplex steel, titanium alloy.<\/div>\n
material de sellado \uff1a<\/div>\n
Conventional temperature: PTFE (temperature resistance \u2264180\u2103), PPL (temperature resistance \u2264300\u2103).<\/div>\n
High temperature\/wear: metal seals (e.g. tungsten carbide coating)<\/div>\n
structural style<\/div>\n
Floating ball valve<\/a>: suitable for small diameter (DN\u2264200mm), medium and low pressure, relying on the medium pressure to press the ball seal.<\/div>\n
Trunnion ball valve<\/a>: large diameter (DN\u2265200mm), high pressure or high precision control, the ball is fixed by the upper and lower shaft, less torque.<\/div>\n
V type ball valve<\/a>: used when flow is to be adjusted, with approximate percentage flow characteristics.<\/div>\n
Sealing class<\/div>\n
Ordinary working condition: ISO 5208 Class VI (soft seal).<\/div>\n
Strict working conditions: Class V or metal sealed zero leakage (e.g. API 6D standard).<\/div>\n

mode of operation<\/h3>\n
Manual: For occasions where frequent operation is not required, it can be equipped with worm gear reducer (large diameter valve).<\/div>\n
Automatic control: Pneumatic: explosion-proof environment (e.g., petrochemical industry).<\/div>\n
Electric: need precise control (e.g., electricity, water treatment).<\/div>\n
Fluid power: high thrust requirements (e.g., main valve for long distance pipelines).<\/div>\n
<\/div>\n

Standards and certification<\/h3>\n
Industry standards: API 6D (petroleum and gas), GB\/T 12237 (general), ASME B16.34 (pressure and temperature rating).<\/div>\n
Special certification: SIL (Safety integrity level), TA-Luft (low emission).<\/div>\n
Economics and maintenance<\/div>\n
Total life cost: includes procurement, installation, maintenance and downtime losses.<\/div>\n
Maintain convenience: modular design, online maintenance capability (such as double cut-off discharge function).<\/div>\n
<\/div>\n

Valves Ball valve selection<\/h2>\n

Define working condition parameters<\/h3>\n
Prepare parameter table, including: medium name, temperature range, pressure range (design pressure\/work pressure), flow rate requirement, pipe size (DN\/inch), connection standard (flange\/thread), action frequency, etc.<\/div>\n
Determine the valve type<\/div>\n
Function selection:<\/div>\n
Switch valve: standard ball valve.<\/div>\n
Regulating valve: V-type ball valve or intelligent valve with locator.<\/div>\n
By structure:<\/div>\n
Three-way, L-type\/T-type channel: used for medium distribution.<\/div>\n
Top Entry: easy to maintain online.<\/div>\n
Material and seal fit<\/div>\n
Valve body\/ball material: Refer to NACE MR0175 standard (including H2S environment).<\/div>\n
Valve seat\/seal:<\/div>\n
Food grade medium: FDA certified materials (e.g., EPDM+PTFE).<\/div>\n
Wear medium: Stellite cemented carbide welding.<\/div>\n
Connection and end face treatment<\/div>\n
Flange connection: RF (surrounding surface), RTJ (ring connection), FF (full plane).<\/div>\n
Welding end: butt welding (BW) is selected for thick wall pipes, and post-weld heat treatment should be considered.<\/div>\n
Thread connection: NPT, BSPT, suitable for small diameter low pressure pipeline.<\/div>\n

Drive mode optional<\/h3>\n
Pneumatic actuator: the air source pressure (0.4~0.7MPa) and double action\/single action (fault safety type) should be specified.<\/div>\n
Electric actuator: protection class (IP67\/IP68), torque matching (opening and closing torque calculation required).<\/div>\n
Manual operation: large diameter valve with gearbox (DN300 or above).<\/div>\n

Performance verification<\/h3>\n
Flow calculation: verify whether Cv value meets the process requirements (Cv=Q\u221a (SG\/\u0394P)).<\/div>\n
Pressure loss: Ensure that the pressure drop of the reducing valve is within the allowable range.<\/div>\n
Anti-cavitation\/flashing: high flow rate medium requires special design of flow channel or multi-stage pressure reduction structure.<\/div>\n

Supplier evaluation<\/h3>\n
Qualification: API 607 fire protection certification, ISO 15848 low leakage certification.<\/div>\n
Case reference: industry application performance (e.g., LNG terminal, chemical plant).<\/div>\n
After-sales service: spare parts inventory, technical support response time.<\/div>\n

Comprehensive cost analysis<\/h3>\n
Initial cost: valve, actuator, and accessories (such as limit switches and solenoid valves).<\/div>\n
Operation and maintenance cost: the frequency of seal replacement and failure rate during the life cycle.<\/div>\n
Technical confirmation and testing<\/div>\n
Factory acceptance test (FAT): including sealing test (high pressure water\/air), operation torque test.<\/div>\n
Special tests: cryogenic treatment, fire resistance test (API 607).<\/div>\n

Installation and debugging<\/h3>\n
Flow direction: ensure that the installation direction of the valve is consistent with the flow direction of the medium (some ball valves have directional requirements).<\/div>\n
Drive mechanism calibration: electric valve needs to be adjusted for opening signal (4~20mA) and position feedback.<\/div>\n
<\/div>\n

Common selection mistakes<\/h3>\n
Excessive pursuit of high material: non-corrosive medium (such as water, air) can be selected carbon steel valve body, to avoid unnecessary costs.<\/div>\n
Neglect dynamic sealing: valves with frequent operation should pay attention to valve stem sealing (e.g., graphite packing vs. spring-loaded PTFE).<\/div>\n
Neglect thermal expansion: high temperature pipeline should calculate the thermal displacement of valve body and pipeline to prevent stress damage.<\/div>","protected":false},"excerpt":{"rendered":"

Principles of valves ball valve selection media characteristics Corrosion resistance: select corrosion-resistant materials (such as 316L stainless steel, Hastelloy) according to the chemical properties of the medium (such as acid, alkali, organic solvent). Cleanliness: hard sealing (metal to metal) or a specially designed anti-clogging structure should be selected for particles or high viscosity media. Phase: […]<\/p>","protected":false},"author":2,"featured_media":4378,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-5548","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"acf":[],"_links":{"self":[{"href":"https:\/\/tops-valve.com\/es\/wp-json\/wp\/v2\/posts\/5548","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/tops-valve.com\/es\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/tops-valve.com\/es\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/tops-valve.com\/es\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/tops-valve.com\/es\/wp-json\/wp\/v2\/comments?post=5548"}],"version-history":[{"count":1,"href":"https:\/\/tops-valve.com\/es\/wp-json\/wp\/v2\/posts\/5548\/revisions"}],"predecessor-version":[{"id":5549,"href":"https:\/\/tops-valve.com\/es\/wp-json\/wp\/v2\/posts\/5548\/revisions\/5549"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/tops-valve.com\/es\/wp-json\/wp\/v2\/media\/4378"}],"wp:attachment":[{"href":"https:\/\/tops-valve.com\/es\/wp-json\/wp\/v2\/media?parent=5548"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/tops-valve.com\/es\/wp-json\/wp\/v2\/categories?post=5548"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/tops-valve.com\/es\/wp-json\/wp\/v2\/tags?post=5548"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}