Metal face seals product listings

Transcription

1 poduct listings Undestanding key tale elements Designed to e use-fiendly, CR Seals and poduct listings convey a good deal of infomation on evey line. As you familiaize youself with the tales, keep these need-to-know asics in d: Seal and poduct sizes All size listings fo all CR Seals poducts ae aanged y ascending shaft s, segegated as inch sizes (geen as) and metic sizes (lue as). All oe and width sizes listed unde the geen as ae in inches, while all sizes listed unde lue as ae in mm. Boe / width Once you have selected the ight shaft size, you will need to identify the seals with a matching oe size. The ecommended toleance anges fo shaft and oe can e found on pages While it is impotant to choose a seal with a close match to shaft and oe, it is less impotant to choose a seal with a pedeteed width. As long as the seal is shot enough not to potude out of the oe, it will wok just ine. Pefeed designs Highlighted in old in the Pat Nume and Seal Type columns, pefeed seal design listings epesent the highest pefog o othewise est suited sealing solution fo a given shaft. Lip Mateial R = NBR (nitile ue) RG = NBR with advanced oil esistance and pumping aility D = XNBR (caoxylated nitile) H = HNBR (hydogenated nitile) V = FKM (luoocaon ue) P = ACM (polyacylate elastome) T = PTFE (polytetaluooethylene) Seal technologies W = SKF Wave: Featuing the patented SKF Wave lip design, these ae the most oust standad seals eve made. E = SKF Edge: SKF Edge shaft seals HMS5 and HMSA10 coe an SKF-developed NBR compound with a ue outside accoding to ISO/DIN gloal design standads pimaily availale in metic sizes. F = SKF Flex: SKF Flex seals delive heavy-duty pefomance in fully customizale sizes and featues to it and pefom in the application. S = Standad oil seal: SKF caies some olde designs that do not have the moden advancements of the SKF Edge o SKF Wave lips, ut may e adequate fo some applications. Use these when SKF Edge o SKF Wave seals ae not availale in the size needed. G = Gease seal: Oil seals can handle oil o gease applications, ut gease seals do not have the gate sping needed fo oil etention, so they ae fo gease only. Nomally you point the lip away fom gease if the main concen is wate/dit ingession, which also allows the gease to puge if needed. Key featues WasteWatche: Indicates that the poduct is most likely to e in stock at ou distiutos and ou own SKF waehouses. The CR Seals Waste- Watche pogam helps distiutos optimize seal inventoies. Boe-Tite: Indicates the seal uses SKF Boe-Tite, a geen, wate-ased acylic sealant used as a coating on the outside of the seal. SS Case: Indicates the seal has a stainless steel seal case. SS Sping: Indicates the seal has a stainless steel seal lip sping. Pessue seal up to 50 psi: Suitale fo highe-pessue sealing applications; typical industial shaft seals can handle only up to 5 o 10 psi. Cove plate equied: Pope seal installation and opeation equies a cove plate, which clamps down axially on an all-ue seal to hold it in place in many lage seal applications. skf.com/cseals SKF, CR Seals, SCOTSEAL, DURATEMP, SPEEDI- SLEEVE, WAVE, ECOPUR, H-ECOPUR, G-ECOPUR and S-ECOPUR ae egisteed tademaks of the SKF Goup. EDGE, FLEX, DURALIFE and DURALIP ae tademaks of the SKF Goup. SKF USA Inc The contents of this pulication ae the copyight of the pulishe and may not e epoduced (even extacts) unless pio witten pemission is ganted. Evey cae has een taken to ensue the accuacy of the infomation contained in this pulication ut no liaility can e accepted fo any loss o damage whethe diect, indiect o consequential aising out of the use of the infomation contained heein. Section of PUB Feuay 2018 Cetain image(s) used unde license fom Shuttestock. com.

2 HDDF metal face seals fom SKF ( ig. 1) ae designed fo sevee opeating conditions at elatively low cicumfeential speeds. They offe eliale potection against solid and liquid contaants as well as leak-poof luicant etention. HDDF application Figue 2 Typical applications Oiginally developed fo off-oad and tacked vehicles, HDDF metal face seals ( ig. 2) have poven equally suitale in applications that need potection against sand, soil, mud, wate and moe. These include: Mixes and conveyos Sand teatment equipment Mining equipment Constuction equipment Agicultual machiney Washing equipment Ginding mills /pulveizing equipment HDDF seal Figue 1 Design featues HDDF seals consist of two identical metal sealing ings and two simila Belleville washes (cup spings) made of nitile o luoo ue compounds, speciically developed fo these seals ( ig. 3). The sealing ings ae made of wea- and coosion-esistant cast alloy and have inely inished sliding and sealing sufaces. The Belleville washes of nitile o luoo ue povide the necessay unifom face loading and effective sealing at the oe and outside s. Adequate toleances etween the seal assemly and the oe ae citical fo pope sealing pefomance. Luicant equiements A luicant should e applied on the dynamic sealing sufaces of a metal face seal to pevent scoing and cove at least 30% of the sealing suface to popely luicate and cool the sealing ings. The luicant can e eithe a detegent like SAE 10W-40, o a eal-ased oil anging fom 10 WT to 90 WT, depending on the amient tempeatue. Some oils contain additives that make them incompatile with elastomes, which can cause degadation of the Belleville washes, especially when exposed to elevated tempeatues. Although eal oils ae always the ecommended luicant, a gease luicant can also e used in some slowly otating o oscillating applications, whee the seal face suface speed does not exceed 100 ft/ (0.5 m/s). At highe speeds, an oil luicant is equied, not only to povide luication to the sealing faces, ut also to cool the sealing ings.

3 Pemissile opeating conditions Depending on thei design, metal face seals can withstand diffeent amounts of intenal pessue. It should, howeve, geneally e maintained elow 35 psi (0.25 MPa). Othe ecommendations egading opeating conditions fo the metal face seals, like tempeatue and speed, ae povided in Tale 1. Contaants Due to thei use in heavily contaated envionments, HDDF metal face seals ae suject to a uild-up of mud packing in the cavity etween the housing and sealing ings and Belleville washe. Eventually, the packing mud will push the Belleville washes out of position, esulting in impope face loads o mud eing pumped past the Belleville washes. Contaants can also cause aasion to the Belleville washes, which in tun causes deteioation of the elastome. Installing HDDF seals Caeful handling and installation of a metal face seal is citical to avoid cutting o teaing of the elastomeic Belleville washes o eaking the metal sealing ings, oth of which can cause pematue seal failue and immediate leakage. It is also vital to keep the sealing faces fee fom contaants like dit o lint. All housing components contacting the Belleville washes must e fee fom contaants (oil, gease, dust, lint paticles, etc.). SKF ecommends using a non-petoleum-ased solvent and a clean, lint-fee wipe to clean these components pio to installation. Once these pepaations ae complete, poceed with HDDF seal installation: 1 Install the Belleville washes seated against the inside shoulde of the metal sealing ings ( ig. 4a). 2 Caefully push each seal half (Belleville washe and metal sealing ing) into the housing until it is fully seated. Check that the seal is not cocked and that the washes ae seated evenly at the ottom of the housing oe. Impope seal installation can esult in uneven face loads aound the cicumfeence of the seal faces, causing scoing o the sealing ings to sepaate and allow oil to leak. 3 Clean oth metal sealing ing faces with a lint-fee wipe and apply a thin ilm of oil. Ensue that no oil is applied to any suface ut the sealing ing faces ( ig. 4). 4 Check that oth housings ae concentic and in coect alignment. The Belleville washes must not unseat fom the ottom of the housing. 5 Caefully ing the two housings togethe, avoiding high impact that can scatch o eak the seal components. 6 Finally, hold one half of the assemly stationay while otating the othe half at least ten complete evolutions. NOTE: This pocedue enales the installe to check that the housing and the Belleville washes ae aligned. If the seal assemly woles, it is necessay to disassemle it and make sue that the Belleville washes ae popely seated in the housing. Design featues shaft Belleville washes metal sealing ings Installation pocedue Figue 3 oe sealing suface Figue 4 Pemissile opeating conditions Tale 1 a seated seated Opeating condition Recommended value Tempeatue, Continuous opeation Nitile ue (NBR) 15 to +210 F 25 to +100 C Fluoo ue (FKM) +15 to 375 F 10 to +190 C Cicumfeential speed, Continuous opeation 350 ft/ 1.8 m/s Bief peiods 750 ft/ 3.8 m/s Pessue, Continuous opeation 35 psi 0.25 MPa Bief peiods 50 psi 0.35 MPa push oil lightly

4 Size listing 3 5 m m ( µin.) B B 1 B 2 D d 3 d 1 Inch SKF pat nume Lip mat l Inch dimensions Shaft Boe Opeating width Seal inside D B 1 d 3 Boe depth Recommended shoulde Undecut B 2) B 2 Sealing ing width Radius in R ± ± R ± ± R ± ± R ± ± R ± ± R ± ± R ± ± R ± ± R ± ± R ± ± R ± ± R ± ± R ± ± R ± ± R ± ± R ± ± R ± ± R ± ± R ± ± R ± ± R ± ± R ± ± R ± ± R ± ± R ± ± R ± ± R ± ± R ± ± R ± ± R ± ± V ± ± R ± ± R ± ± R ± ± V ± ± V ± ±

5 Size listing 3 5 m m ( µin.) B B 1 B 2 D d 3 d 1 Metic (mm) Metic dimensions Shaft Boe Opeating width Seal inside D B 1 d 3 Boe depth Recommended shoulde Undecut B 2) B 2 Sealing ing width Radius Lip mat l SKF pat nume in ± ± R ± ± R ± ± R ± ± R ± ± R ± ± R ± ± R ± ± R ± ± R ± ± R ± ± R ± ± R ± ± R ± ± R ± ± R ± ± R ± ± R ± ± R ± ± R ± ± R ± ± R ± ± R ± ± R ± ± R ± ± R ± ± R ± ± R ± ± R ± ± R ± ± R ± ± V ± ± R ± ± R ± ± R ± ± V ± ± V Key featues: WasteWatche Boe-Tite SS Case SS Sping Pessue seal up to 50 psi Cove plate equied