{"id":11844,"date":"2026-04-29T17:52:05","date_gmt":"2026-04-29T15:52:05","guid":{"rendered":"https:\/\/lubeteam.it\/prodotto\/brass-breather-plug-miselli-series-33-a\/"},"modified":"2026-05-04T16:50:36","modified_gmt":"2026-05-04T14:50:36","slug":"brass-breather-plug-miselli-series-33-a","status":"publish","type":"product","link":"https:\/\/lubeteam.it\/en\/product\/brass-breather-plug-miselli-series-33-a\/","title":{"rendered":"Brass Breather Plug Miselli Series 33 A"},"content":{"rendered":"

The Miselli Brass Breather Plug Series 33 A represents an advanced technical and construction solution, specially developed to keep the internal pressure of oil-bath lubricated mechanisms perfectly balanced and under strict control<\/span><\/span>. This component is essential for ensuring the longevity, safety, and maximum efficiency of industrial hydraulic systems and power transmission systems.<\/span><\/p>\n

Operating Principle of the Breather Valve<\/h3>\n

The main engineering feature of this series is the integration of an internal one-way breather valve, equipped with a metal shutter with O-Ring<\/span><\/span>. <\/span>This technical valve is indicatively calibrated to open at approximately 0.30 bar<\/span><\/span>. <\/span>Its primary purpose is to allow the rapid release of excess air and oil vapors that accumulate during the normal thermal and mechanical work cycle<\/span><\/span>. <\/span>This precise venting process is essential, as it prevents a dangerous increase in internal pressure inside the gearbox or any other similar device on which the plug is installed<\/span><\/span>.<\/span><\/p>\n

Construction Features and Material Selection<\/h3>\n

The product is manufactured using very high-quality materials to withstand demanding industrial environments and extend the machinery life cycle. <\/span>The main body of the filling and breather plugs is entirely made of brass<\/span><\/span>. <\/span>Inside, the mechanism relies on a robust stainless steel spring and a sealing pad made of NBR (Nitrile Butadiene Rubber)<\/span><\/span>. <\/span>For optimal coupling, a sealing gasket is used, which can be supplied in aluminum or in FASIT 202 or ROLLMART fiber<\/span><\/span>. <\/span>The upper portion of the component is covered by a protective cap made of white galvanized steel; this element performs a crucial protective action, preventing foreign bodies, dust, and contaminants from entering the hydraulic circuit<\/span><\/span>.<\/span><\/p>\n

Specific Applications and Fields of Use<\/h3>\n

The components of Series 33 A have been designed to meet the requirements of numerous industrial sectors and are particularly suitable for application on gearboxes, variators, speed increasers, gear housings, and transmission components in general<\/span><\/span>. <\/span>Their particular construction architecture makes them extremely high-performing even in mobile applications<\/span><\/span>. <\/span>In these specific dynamic contexts, the presence of the one-way valve effectively counteracts accidental oil leakage that may occur during movement phases, such as during the delicate transport operations of operating machines<\/span><\/span>. <\/span>The operating temperature recommended by the manufacturer to maintain physical and mechanical properties unchanged, including perfect gasket functionality, is within an operating range from -10\u00b0C to +90\u00b0C<\/span><\/span>.<\/span><\/p>\n

Technical Specifications and Dimensional Variants<\/h3>\n

To ensure the widest installation compatibility, Series 33 A is available in an extensive range of standardized hydraulic threads. <\/span>The catalog options include Gas (G) threads in sizes from 1\/8″ up to 1 1\/2″, tapered (R) threads from 1\/4″ to 3\/4″, as well as a complete range of metric threads from M10x1 up to M30x2<\/span><\/span>. <\/span>To increase design versatility, for sizes 1\/4″, 3\/8″, 1\/2″, and 3\/4″, tapered thread versions can be supplied<\/span><\/span>.<\/span><\/p>\n

Technical summary table of the main characteristics of the Miselli Brass Breather Plug Series 33 A<\/h3>\n
\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
Feature<\/th>\nValue<\/th>\n<\/tr>\n<\/thead>\n
Body Material<\/td>\nBrass<\/td>\n<\/tr>\n
Protective cap<\/td>\nWhite galvanized steel<\/td>\n<\/tr>\n
Internal spring<\/td>\nStainless steel<\/td>\n<\/tr>\n
Sealing pad<\/td>\nNBR<\/td>\n<\/tr>\n
Sealing gasket<\/td>\nAluminum or FASIT 202 or ROLLMART fiber<\/td>\n<\/tr>\n
Valve type<\/td>\nOne-way, with metal shutter and O-Ring<\/td>\n<\/tr>\n
Valve opening calibration<\/td>\n~ 0.30 bar (indicative)<\/td>\n<\/tr>\n
Recommended operating temperature<\/td>\nFrom -10\u00b0C to +90\u00b0C<\/td>\n<\/tr>\n
Available Gas (G) threads<\/td>\nG1\/8, G1\/4, G3\/8, G1\/2, G3\/4, G1, G1 1\/4, G1 1\/2<\/td>\n<\/tr>\n
Available Tapered (R) threads<\/td>\nR1\/4, R3\/8, R1\/2, R3\/4<\/td>\n<\/tr>\n
Available Metric threads<\/td>\nM10x1, M12x1.5, M14x1.5, M16x1.5, M18x1.5, M20x1.5, M22x1.5, M24x1.5, M24x2, M30x2<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n","protected":false},"excerpt":{"rendered":"

Designed for oil-bath mechanisms, the Miselli Brass Breather Plug Series 33 A effectively controls internal pressure<\/span><\/span>. <\/span>The one-way valve, calibrated at 0.30 bar, releases excess air and vapors, preventing dangerous overpressure<\/span><\/span>. <\/span>Built with a brass body, stainless steel spring, NBR seal, and protected by a galvanized steel cap that blocks impurities<\/span><\/span>. <\/span>Ideal for mobile applications, it ensures hydraulic sealing from -10\u00b0C to +90\u00b0C<\/span><\/span>.<\/span><\/p>\n","protected":false},"featured_media":11733,"template":"","meta":[],"product_brand":[],"product_cat":[98,453],"product_tag":[258],"class_list":{"0":"post-11844","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"product_cat-accessories-for-hydraulic-power-units","7":"product_cat-metal-plugs-and-breathers","8":"product_tag-miselli","10":"first","11":"instock","12":"shipping-taxable","13":"product-type-simple"},"yoast_head":"\nBrass Breather Plug Miselli Series 33 A \u2013 LubeTeam Hydraulic<\/title>\n<meta name=\"description\" content=\"The Miselli Brass Breather Plug Series 33 A with 0.30 bar valve balances pressure in gearboxes. 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