Hy~Line and Ultima Lobe Pumps - Jabsco - #19

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2/00 6.21 Hy~Line and Ultima Lobe Pumps Hy~Line and Ultima pumps are fitted with the same high quality mechanical shaft seals to prevent leakage of product from the pump into the atmosphere and to prevent contamination by airborne micro-organisms. All pumps are available with single face seals - Fig 1, and with flushed or double seals as an option; see separate data sheets. This seal design is unique to Hy~Line and Ultima and has a number of features which are of major benefit to the user: . Hydraulically pressure-balanced . Crevice-free for highest standards of CIP and SIP capability . Fully self-draining . Withstands SIP temperatures and thermal shock . Solid faces, no metal parts in fluid contact . No moving parts or springs in fluid contact . Fitting length pre-set . Front-loading: seal can be inspected/serviced without removing rotor case . Anti-rotation device on both faces . Fully interchangeable parts . Simple spare parts ordering The seal faces are of a balanced design so that the contact pressure between the faces is controlled. This gives excellent sealing even at very low pressures as well as long life at high pressures. Also, the Jabsco pump seal is specially developed to fully expose the sealing faces and the joints around the seal to the fluid. This ensures good circulation of product to avoid stagnant areas where bacteria can multiply, good cooling of the seal faces and maximum flow of cleaning fluids around the seal. (Other pump types have the seal mounted in a cavity in the rear of the pump which is not easily cleaned due to its inaccessibility). This design also ensures that, when the pump is stopped, fluid can drain from the seal area. Hy~Line and Ultima pump seals do not use O-rings anywhere in product contact (except certain elastomer options - see Elastomers data sheet) Fig 2 shows the specially developed joint around the rotating seal face. The rotating seat is fitted directly into the back of the rotor to eliminate crevices and the .L.- section seal cup is slightly flared at its edges .a.. The stationary seat is sealed directly to the rotor case by a ring with a modified square cross-section (except certain elastomer options - see Elastomers data sheet). Both these joints are, in effect, types of gasket. But whereas a flat gasket could allow some penetration of product at its edges when pressurised, these joints prevent this due to the higher contact force where they interface with the product zone. It can be seen quite clearly that these joints are far less likely to harbour bacteria than conventional joints. Single seals are available in three face material combinations: Carbon on Stainless-Steel code 8 Carbon on Silicon-Carbide code 3 Silicon-carbide on Silicon-Carbide code 2 Single Shaft Seals Seal Position and Design Materials and Applications Fig 1 Fig 2