CARTRIDGES
 Notes Some particularly small pumps come with very small stuffing box (SB) cross-sections. The D1 dimension requires special attention therefore. The distance D1 to the SB diameter should be no less than approx. 1 mm (0,039") in radius if at all possible. As a general precaution when using cartridge seals at operating pressures above 15 bar (225 PSI) DEPAC again recommends drilling the shaft or sleeve where the set screws are to be tightened or securing the cartridge sleeves against axial slip. |
Type 270
Convincing Arguments! The number of cartridge seals purchased and used in preference to other seal types is increasing steadily world-wide. Users are convinced by the simple installation and removal of cartridge seals. Difficulties and mistakes during installation are ruled out. Maintenance overheads are the same as for component seals because the costs of wearing parts and spare parts are identical. These are decisive factors in favor of cartridge designs. DEPAC offers a wide range of stationary cartridge seals. The various alternatives are based on basic design features: O-rings, rolled bellows and welded bellows. The majority of glands are produced using the investment casting method which combines high precision and excellent surface quality with cost-effective production. The STATIONARY design principle developed by DEPAC for the process industry ensures the highest reliability even in difficult seal applications. |
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Type 301
Convincing Arguments! In its wide range of cartridge mechanical seals DEPAC also offers a series of O-ring, rolled bellows and welded bellows seals with 1/4" NPT flush and quench connections integrated in the gland. All designs can be supplied optionally with "DEPAC Standard Gland Versions" or glands for "Large Stuffing Box Diameters". The investment casting method is used for this series. It not only produces glands with a high-quality surface but is also extremely cost-effective, as is reflected in the attractive price for the end customer. Notes Some particularly small pumps come with very small SB cross-sections. Therefore the D1-dimension requires special attention. The distance D1 to the SB diameter should be no less than approx. 1mm (0.039") in radius if at all possible. |
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 Notes On some pump designs the distance from the face of the stuffing box to the bearing housing is very short. The L1dimension requires special attention therefore. The distance D1 to the SB diameter should be no less than approx. 1 mm (0.039") in radius if at all possible. Versions with larger packing cross-sections and/or more packing rings are available as special designs. Double cartridge seals incorporating this safety feature are also available. Hard chrome plating of the sleeve is possible for additional protection against wear. |
Type 270 P
Convincing Arguments! No mechanical seal lasts for ever. Even double seals are not strictly "safe" given that the two seals are installed at the same time and have the same expected lifespan. No manufacturer guarantees that the second seal will hold good after the first one has failed. Even the "disaster bushings" specified by the oil industry (API) are unable to rule out leakage when a seal fails. DEPAC safety seals are designed to guarantee a high level of process safety by controlling the leakage from a failed seal. The emergency seal is adjusted to an acceptable leakage rate and can stay in operation until the next scheduled plant stoppage. In extreme conditions requiring a double mechanical seal it is possible to upgrade the double seal with an additional safety seal. The higher price of a DEPAC safety seal stands in no relation to the expense of lost production! |
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Type 301 P
Convincing Arguments! No mechanical seal lasts for ever. Even double seals are not strictly "safe" given that the two seals are installed at the same time and have the same expected lifespan. No manufacturer guarantees that the second seal will hold good after the first one has failed. Even the "disaster bushings" specified by the oil industry (API) are unable to rule out leakage when a seal fails. DEPAC safety seals are designed to guarantee a high level of process safety by controlling the leakage from a failed seal. The emergency seal is adjusted to an acceptable leakage rate and can stay in operation until the next scheduled plant stoppage. In extreme conditions requiring a double mechanical seal it is possible to upgrade the double seal with an additional safety seal. The higher price of a DEPAC safety seal stands in no relation to the expense of lost production! Notes |
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Type 322
Convincing Arguments! The cartridge design eliminates practically all the installation problems associated with the many individual parts of a double seal system. The cartridge is assembled in the factory or workshop and can be tested for leaks with a barrier fluid before it is quickly and easily installed as a finished seal in the pump. Gone are the days when a seal is installed in the pump at great expense of time and money only to discover that it leaks. Double seals should always be used in tandem-active arrangement. In these designs the medium to be sealed is flung off the seal face by the centrifugal force of the shaft. The face remains clean. The DEPAC stationary mechanical seal design has a tandem-active arrangement and therefore guarantees the greatest possible reliability of performance and the longest possible life. Notes If the cross-sections of the stuffing boxes are sufficient, Type 323 would be recommendable as the standard seal. Standard glands are available as ECONOMY versions up to nominal Ø 70 (2 3/4"). For Ø 75 and above the glands are produced in round shape. As a precaution when using double cartridge seals at operating pressures above 15 bar DEPAC recommends drilling the shafts or sleeves where the set screws are to be tightened in order to prevent axial shifts. |
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Type 326
Convincing Arguments! On exceptionally large pumps, agitators, mixers, autoclaves, filters, calenders, fermenters and similar units with large shafts there is often a tendency for the shafts to wander well off center. This is evident not only in axial and radial movements but also in pendulating movements. Conventional mechanical seals cannot cope with these extreme conditions. Additional bearings are often used therefore in the seal chambers. Apart from being far more expensive these designs will immediately fail if the bearings are damaged prematurely due to overloading. For these applications DEPAC offers a design with "floating" faces which absorb these extreme movements in the seal itself and still hold the faces together with the same pressure conditions. These mechanical seals work reliably and completely independently of any shaft movements. Notes Other dimensions for special applications and for different shaft sizes and motion tolerances are available on request. |
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Type 365
Convincing Arguments! On exceptionally large pumps, agitators, mixers, autoclaves, filters, calenders, fermenters and similar units with large shafts there is often a tendency for the shafts to wander well off center. This is evident not only in axial and radial movements but also in pendulating movements. Conventional mechanical seals cannot cope with these extreme conditions. Additional bearings are often used therefore in the seal chambers. Apart from being far more expensive these designs will immediately fail if the bearings are damaged prematurely due to overloading. For these applications DEPAC offers a design with "floating" faces which absorb these extreme movements in the seal itself and still hold the faces together with the same pressure conditions. These mechanical seals work reliably and completely independently of any shaft movements. Notes Other dimensions for special applications and for different shaft sizes and motion tolerances are available on request. |
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Type 370
Convincing Arguments! For all applications requiring DIN shaft and flange dimensions DEPAC offers a mechanical seal system from which the optimum seal form can be selected for the purpose in question. The flange parts, face parts and certain seal housing parts are interchangeable, enabling the user to keep stock levels low while still meeting a broad demand for spare parts. This modular system guarantees all the advantages of the stationary mechanical seals previously described which are needed for an optimized service life. Notes DIN 28141 flange DIN 28154 shaft form A - B - C Please note that the mechanical seal version can be manufactured and delivered not only for the DIN dimensions listed but also for ALL other mounting situations, including inch sizes. Parts are shown without dimensions in some drawings. All dimensions can be found in the drawing for TYPE 370. |
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Type 390 Split Single Mechanical Seals
Convincing Arguments! This new, split mechanical seal proves once again that the DEPAC business and product philosophy is focused on providing benefits for its customers. Perfect technology, high reliability and the lowest possible purchasing and operating costs are paramount. Equipment fitted with split mechanical seals works without leakage and does not have to be dismantled in order to replace the seal or its parts. Production losses and expensive, time-consuming maintenance are avoided. This applies in particular for large and complicated machines. The higher price of a reliably working, split mechanical seal stands in no relation to the potential expense of installing a non-split mechanical seal! Notes DEPAC's latest development of the split mechanical seal is the ideal option for large and heavy-duty machines with rotating shafts which require sealing and for equipment which needs a great deal of work to change a mechanical seal. Often there was no choice but to use packings on these machines, in spite of their known drawbacks. These were taken into the bargain because of the unjustifiably high cost of mechanical seal maintenance. DEPAC's new, split mechanical seal combines in optimum manner the advantages of a packing which is easy-to-change with those of a mechanical seal which is leak-free, optimized for life and operationally efficient. |
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