Making the shift to connections with elastomeric O-ring seals is the focus in today's fluid power industry. But before following everyone's lead, it's important you understand the connections to properly use them within your application, especially since hydraulic systems use many types of fittings and adapters within different sealing methods and thread forms.
Zašto koristiti prirubnički spoj
Hydraulic connections are used to prevent leaks and other possible failures within high-pressure applications, especially in larger sizes. Flanges are used when designing for easy connection between the hose, tube and pipe. It's where flexibility is needed the most within the system.
Prirubnički priključci se obično koriste u aplikacijama sa izuzetno visokim pritiscima kada se koriste cijevi ili cijevi s vanjskim promjerom preko 7/8 in. Mogu se spojiti vijcima kako bi se spojila dva dijela cijevi (cijev ili crijevo), ili vijcima ili vijcima u komponentu za osigurajte prirubnički spoj ili dio cijevi. Prirubnice se takođe mogu rastaviti radi lakšeg pristupa za modifikaciju sistema, čišćenje ili pregled. Određene prirubnice također mogu biti trajno zavarene zajedno ili na dio otvora komponente kao što je kućište motora ili otvor ventila. Češće, prirubnički spoj se pravi spajanjem dvije prirubnice zajedno sa zaptivkom-između kako bi se osiguralo sigurno zaptivanje.
Razlog njihove upotrebe je direktno povezivanje portova bez upotrebe konektora ili adaptera sa navojem. Dobre su za-teško dostupna- područja, brzo održavanje i rigorozne hidrauličke primjene. Prirubnički spojevi su također najbolja opcija za priključke na krajevima crijeva koji imaju krivine i podložni su velikim bočnim silama.
But before any hose, tube and pipe are assembled, it's important to identify the ends of the ports and connectors. It helps to ensure the connection will be safe. The Society of Automotive Engineers (SAE)and International Organization for Standardization (ISO) help you to identify any specific problems when making these connections.
Prirubnički priključci sa O-prstenovima proizvode minimalno curenje kada su pravilno usklađeni. Elastomerna brtva se nalazi unutar žlijeba za zatvaranje tekućine. Ovi priključci uključuju SAE ravni navoj, čeonu brtvu, ISO 6149, SAE J518 (kod 61 i kod 62) prirubnice, itd.
Common types of flange fittings and components:
SAE J518 prirubnički priključci — SAE J518 is used throughout the world to connect larger diameter tubing and pipe within the fluid power industry. Minus the bolt sizes, SAE J518 flanges are interchangeable with ISO 6141, DIN 20066 and JIS B 8363. These flanges come in two pressure classes. The standard is ISO6162, and it includes SAE Code 61 and Code 62. This is important because if the wrong flange is installed, you could have serious problems in your system because a SAE Code 62 handles up to 6,000 psi and a SAE Code 61 handles up to 3,000 to 5,000 psi.
Prirubničke obujmice — Captive flange clamps are often used when connecting tubes, pipes or hoses. They slip over the flared tube and are easily connected to the mating flange or component. These types of clamps are commonly used with MJ-flange straight fittings because there is a smooth clearance to slide over the fitting and sit on the flange head.
Razdvojene prirubničke stezaljke — Split flange clamps are made from two interlocking pieces, fitting securely together with nuts and bolts. Since they have two pieces, these types of clamps are used to reinforce weak areas within the tubing and pipe. They can add an attachment where traditional flanges could not. You can buy these flange fitting clamps in kits (either for Code 61 or Code 62). A kit could include the two pieces, O-ring face seal (ORFS) and four bolts and washers.
Ove uobičajene vrste prirubničkih spojnica i komponenti su mnogo manje vjerovatno da će se olabaviti kada postoji pravilna raspodjela opterećenja stezanja oko glave prirubnice.
ORFS okovi su pouzdani
Fittings and component assemblies are required to work in harsh environments, such as corrosive offshore applications to extreme temperature and pressure fluctuations. ORFS fittings are reliable because they include elastomeric seal O-rings. It's one of the best choices for a leak-free connection.
Kao što naziv implicira, ORFS, ili (O-oprsten Face Seal) fitinzi sadrže O-prsten na prednjoj strani fitinga. Napravljeni prema standardu SAE J1453, ORFS priključci se obično proizvode od ugljika, niklovanog ugljika i nehrđajućeg čelika i obično koriste elasteromerne brtve, kao što su Buna-N ili Viton, 90 Durometer O-prstenovi koji se postavljaju u žljeb na prednjoj strani okova.
Kada se o-prsten stisne između-obrvene površine fitinga i ravne površine spojnog ORFS fitinga ili formirane cijevi, stvara se -nepropusna brtva. Kada je veza zategnuta, O-prsten se pritiska na ravnu površinu spojnog spoja ili cijevi.
Dok je dostupan-od nehrđajućeg čelika, standardni ORFS okovi i ravni rukavi su napravljeni od plastificiranog čelika ili nehrđajućeg čelika. Prvo dizajnirani za-gradnju van cesta, ORFS armature se sada koriste u drugim aplikacijama u transportu. ORFS fitinzi su dobri za visoke pritiske koji su podložni savijanju ili naponima pritiska, kao što su građevinarstvo, poljoprivreda, nafta i gas, rudarstvo i industrijska tržišta visokih{2}}performansi. Oni su također poželjna veza za sisteme sa visokim vibracijama jer je O-prsten mekan i bolje apsorbira udare od metalnih-na-metalnih zabrtvljenih fitinga.
Uzroci curenja hidrauličkog sistema
If you're having hydraulic system leakage, know that it is rarely caused by the fitting itself. The primary contributors to system leaks include improper installation, poor system design, component quality and system abuse.
It's important that you understand this because the result can be costly. Not only is it costly from an equipment and operation standpoint, but it's also costly from a loss of fluid standpoint. If an operation is running 24 hours a day and hydraulic oil costs 25 a gallon, the cost of leaking fluid can be significant. System design is the first place to start when preventing a leak. The right components must be selected to reduce the incidences of leaks and connection failures. When preventing curenje hidrauličnog sistema, pregledajte sljedeća područja:
Aplikacija — Your environment determines the fitting design and selection. For example, stainless steel or other protective coatings can extend the service life in corrosive environments. Even the choice of O-ring material must meet the system conditions. A fluorocarbon or other material may need to be specified over Buna-N in some applications
Pritisak — The dynamic pressure rating of the flange fitting assembly must be equal to or higher than the system's pressure. Fittings are rated at a 4:1 design ratio, which applies to normal operating conditions for withstanding moderate hydraulic and mechanical shock. For severe vibration and shock, a "de-rating factor" should be applied directly to the dynamic pressure of the fitting.
Temperatura — The operating temperature for fittings and O-ring seals is dependent on the plating and the metal and seal materials.
Finding what's right for your application
If you're ordering quality flange fittings and ORFS components from a reputable manufacturer, then you should be in a better place than most. It's important to collaborate with your supplier to make sure that you choose what is good for your application.
Dostupni su pravi proizvodi za vaš sistem. Samo budite sigurni da tražite najbolje-u-klasi proizvode od certificiranih proizvođača koji mogu brzo odgovoriti na vaše rastuće potrebe, a da pritom ispunjavaju i premašuju industrijske standarde. Dizajn i izdržljivost svake prirubničke armature i komponente osigurat će dugotrajnu-uslugu, čak iu korozivnim i agresivnim okruženjima.
