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
  • O-ring design
  • 1/8" NPT axial flush and quench (up to Ø 70 mm)
  • Extremely short design

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.
 
  • Stationary design principle
  • Cartridge mounted
  • 270 gland with 1/8" NPT AXIAL FLUSH and QUENCH (up to Ø 70 mm)
  • Shock and vibriation- dampend faces
  • Springs outside the medium independent of the direction of shaft rotation
 
RANGES OF APPLICATION
Pressure 700 mm Hg (28" HG) – 28 bar (420 PSI)
Temperature Depends on the elastomer
Speed 35 m/sec. (7000 FKM)
   
SIZES
Dshaft 24 ... 100 mm
  1" ... 4"
   
MATERIALS
Metals DIN 1.4571, 316 SS/Hastelloy C
Springs Hastelloy C
Faces CA, SC, SSIC, TC
O-Rings FKM, EPDM, PTFE, FEP encaps., Chemraz, Kalrez, Aflas, etc.
   
Other sizes, materials or design versions on request.

 








Type 301
  • Stationary, O-ring design
  • Extremely short design
  • Suitable for confined stuffing boxes from 7.94 mm (5/16") cross-section
     

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.
  • Stationary design principle
  • Cartridge mounted
  • Glands with 1/4" NPT AXIAL FLUSH and QUENCH connections
  • Shock and vibriation- dampend faces
  • Springs outside the medium independent of the direction of shaft rotation
RANGES OF APPLICATION
Pressure 700 mm Hg (28" HG) – 28 bar (420 PSI)
Temperature Depends on the elastomer
Speed 35 m/sec. (7000 FKM)
   
SIZES
Dshaft 24 ... 100 mm
  1" ... 4"
   
MATERIALS
Metals DIN 1.4571, 316 SS/Hastelloy C
Springs Hastelloy C
Faces CA, SC, SSIC, TC
O-Rings FKM, EPDM, PTFE, FEP encaps., Chemraz, Kalrez, Aflas, etc.
   
Other sizes, materials or design versions on request.

 








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
  • O-ring design
  • Alternative
      – Welded bellows
         Type 296 P
      – Rolled bellows 
         Type 299 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!
  • ADJUSTABLE emergency seal
  • Stationary design principle
  • Cartridge mounted
  • Design versions with O-ring, welded or rolled bellows
  • Balanced
  • Gland alternatives
    – Standard glands with or without special connections
    – Gland with 1/4"NPT axial flush connections      
    – Gland for large stuffing box diameters
RANGES OF APPLICATION
Pressure 700 mm Hg (28" HG) – 28 bar (420 PSI)
Temperature Depends on the elastomer
Speed 25 m/sec. (5000 FKM)
   
SIZES
Dshaft 24 ... 100 mm
  1" ... 4"
   
MATERIALS
Metals DIN 1.4571, 316 SS/Hastelloy C
Springs Hastelloy C
Faces CA, SC, SSIC, TC
O-Rings FKM, EPDM, PTFE, FEP encaps., Chemraz, Kalrez, Aflas, etc.
Welded bellows  Hastelloy C
Rolled bellows  Hastelloy C, Incolloy
   
Other sizes, materials or design versions on request.

 







 
Type 301 P
  • O-ring design
  • Gland with 1/4" NPT flush and quench connections

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
On some pump designs the distance from the stuffing box face to the bearing housing is very short. The L4 dimension requires special attention therefore.
The distance D2 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 322
  • Stationary double cartridge design
  • Tandem-active arrangement
  • Barrier space with patented pump design
  • Barrier fluid shroud under the outer seal faces
  • 322 Z for small stuffing boxes Dshaft 1“ – 1 3/8“

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.
  • Stationary design principle
  • Cartridge mounted
  • Double balanced
    full pressure rating possible on pump side AND barrier side
  • Self-closing in case of pressure reversal
  • Tandem-active arrangement
  • Independent of the direction of shaft rotation
  • Barrier space with patented pump design possible
  • Barrier fluid shroud
  • Adjustable 1/4" NPT adapter connections
  • Venting options
RANGES OF APPLICATION
Pressure 700 mm Hg (28" HG), 28 bar (420 PSI)
Pressure table atmosphere = 0 bar (0 PSI)
Medium pressure Barrier pressure
28 bar (420 PSI) * 0
28 bar (420 PSI) 28 bar (420 PSI)
0 28 bar (420 PSI)
* Only for lubricating liquids
Temperature Depends on the elastomer
Speed 35 m/sec. (7000 FKM)
   
SIZES
Dshaft 24 ... 100 mm
  1" ... 4"
   
MATERIALS
Metals DIN 1.4571, 316 SS / Hastelloy C
Springs Hastelloy C
Faces CA, SC, SSIC, TC
O-Rings FKM, EPDM, PTFE, FEP encaps., Chemraz, Kalrez, Aflas, etc.
   
Other sizes, materials or design versions on request.

 





Type 326
  • Stationary double cartridges in "floating" design
  • Motion tolerances
    Ø <70
    axial ± 2 mm (0.08")
    radial ± 0,5 mm (0.02")
    Ø >70
    axial ± 2 mm(0.08")
    radial ± 0,8 mm (0.03")
     
  • Venting option
  • Tandem-active arrangement

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.
  • Stationary design principle
  • Cartridge mounted
  • EXTREME motion tolerances
  • Venting option
  • Full pressure reversability
  • Self-closing in case of pressure reversal
  • Double balanced
  • Shock and vibriation- dampend faces
  • Axial or radial 1/4" NPT barrier fluid connections
RANGES OF APPLICATION
Pressure 700 mm Hg (28" HG), 28 bar (420 PSI)
Pressure table atmosphere = 0 bar (0 PSI)
Medium pressure Barrier pressure
28 bar (420 PSI) * 0
28 bar (420 PSI) 28 bar (420 PSI)
0 28 bar (420 PSI)
* Only for lubricating liquids
Temperature Depends on the elastomer
Speed 25 m/sec. (5000 FKM)
   
SIZES
Dshaft 24 ... 200 mm
  1" ... 7 1/2"
   
MATERIALS
Metals DIN 1.4571, 316 SS
Springs Hastelloy C
Faces CA, SC, SSIC, TC
O-Rings FKM, EPDM, PTFE, FEP encaps., Chemraz, Kalrez, Aflas, etc.
   
Other sizes, materials or design versions on request.

 





Type 365
  • Stationary double cartridges in "floating" design
  • Motion tolerances
    Axial and radial ± 2.5 mm (0.098")
  • Venting option
  • Tandem-active arrangement

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.
  • Stationary design principle
  • Cartridge mounted
  • EXTREME motion tolerances
  • Venting option
  • Full pressure reversability
  • Self-closing in case of pressure reversal
  • Double balanced
  • Shock and vibriation- dampend faces
  • Axial or radial 1/4" NPT barrier fluid connections
RANGES OF APPLICATION
Pressure 700 mm Hg (28" HG), 28 bar (420 PSI)
Pressure table atmosphere = 0 bar (0 PSI)
Medium pressure Barrier pressure
28 bar (420 PSI) * 0
28 bar (420 PSI) 28 bar (420 PSI)
0 28 bar (420 PSI)
* Only for lubricating liquids
Temperature Depends on the elastomer
Speed 25 m/sec. (5000 FKM)
   
SIZES
Dshaft 24 ... 200 mm
  1" ... 7 1/2"
   
MATERIALS
Metals DIN 1.4571, 316 SS
Springs Hastelloy C
Faces CA, SC, SSIC, TC
O-Rings FKM, EPDM, PTFE, FEP encaps., Chemraz, Kalrez, Aflas, etc.
   
Other sizes, materials or design versions on request.

 







Type 370
  • Stationary double cartridge seal with bearing
  • DIN 28141 flange
  • DIN 28154 shaft form A-B-C or according to all other standard specifications or customer requirements

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.  

  

  • Stationary design principle
  • Cartridge mounted
  • DIN dimensions, alternatives are possible
  • Shock and vibration-dampend faces
  • Double balanced
  • Full pressure reversability
  • Self-closing in case of pressure reversal
  • Mirror-image face design
  • Independent of the direction of shaft rotation
RANGES OF APPLICATION
Pressure 700 mm Hg (28" HG), 28 bar (420 PSI)
Pressure table atmosphere = 0 bar (0 PSI)
Medium pressure Barrier pressure
28 bar (420 PSI) * 0
28 bar (420 PSI) 28 bar (420 PSI)
0 28 bar (420 PSI)
* Only for lubricating liquids
Temperature Depends on the elastomer
Speed 20 m/sec. (4000 FKM)
   
SIZES
Dshaft 40 ... 220 mm
inch sizes upon request
   
MATERIALS
Metals DIN 1.4571, 316 SS for parts in contact with the medium
Alternatives
e.g. Hastelloy C, Monel, titanium or enamel coating etc.
Springs Hastelloy C
Faces CA, SC, SSIC, TC
O-Rings FKM, EPDM, PTFE, FEP encaps., Chemraz, Kalrez, Aflas, etc.
   
Other sizes, materials or design versions on request.



 
 
1. Large empty space above the seal faces
Solid matter is flung outwards off the faces by the centrifugal force.
 
 
2. Special pins for holding back the springs
The springs do not pressurize the seal faces until after the pins are removed when the installation work is finished.
 
 
3. O-rings with integrated connection pins
An absolute innovation for split mechanical seals. Installation is made safer and easier as the result.
 
 
4. Housing centering elements
Another innovation which makes installation extremely easy because the pins do not need to be removed when the seal is fully installed.
 
Type 390
         Split Single Mechanical Seals
  • Stationary design
  • Fast, easy and reliable installation
  • Effective alternative for media with solid materials
  • Best sealing alternative for large-scale units
  • Lowest contact pressure for the longest possible service life

Convincing Arguments!

This newsplit 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.
  • Stationary design principle
  • No dismantling of equipment necessary
  • Easy conversion from packing to mechanical seal
  • Straight-forward installation
  • Reliable use even with media containing solid materials
  • Short axial dimension design
  • High operational reliability
RANGES OF APPLICATION
Pressure 700 mm Hg (28" HG), 12 bar
Temperature Depends on the elastomer
Speed Dependent on pressure
   
SIZES
Dshaft 50 ... 140 mm
  2" ... 5 1/2"
  Special production up to 330 mm (12")
   
MATERIALS
Metals DIN 1.4571 (316 SS)
Springs Hastelloy C
Faces CA, SC
O-Rings FKM, EPDM
   
Other sizes, materials or design versions on request.