CHETRA^® Produkte

Double acting, stationary cartridge, short designed mechanical seal
executions:
– 877X for chemical norm pumps (TA-Air conform)
– 877X Aseptik sterile, double balanced
– 877XC according to 24960C (Wave: 30mm – 60mm)
– 877GS gas mechanical seal
– 877S screw pumps
All sizes are available in inch too
It is not allowed to use all max. parameters at the same time!

Pump, double mechanical seal for challenging applications
More designs:
– 881S
– 881A according to API 682
– 881D differential plunger, double balanced
– 881DHD water injection pump up to 150 bar
ATEX on request (depends on parameters)
All sizes are available in inch too
It is not allowed to use all max. parameters at the same time!

High-temperature bellows – double/ tandem mechanical seal for hot media, with conveying thread, self-adjusting mating ring
Further versions:
– 875A
– 875AS with double-barrel conveying thread
Max. pressure inside: 10bar
Sizes also available in inch sizes
Not all max. values may be used at the same time!

Double acting, back to back, stationary mechanical seal, double feed screw, special heat dissipation, especially for challenging applications in refineries.
Designs:
– 861S
– 861AS
ATEX on request (depends on parameters)
All sizes are available in inch too
It is not allowed to use all max. parameters at the same time!

Double Acting Cartidge mechanical seal. Typical applications: Sealing of toxic and explosive media.
Designs:
– 851B back to back
– 851BT double pressure balanced
– 851T-A
– 851T tandem version according to API 682
– 851TB tandem face to back version / API 682
Sizes also available in inch dimensions
Not all max. values may be claimed at the same time!

Combination hybrid double mechanical seal; media side stationary O-ring seal; atmosphere side: metal bellows for centrifugal and screw pumps, among others, for bitumen and asphalt
Further versions:
– 857S (special version)
Sizes also available in inch dimensions
Not all max. values may be claimed at the same time!

High tech cartridge mechanical seal, back to back configuration, special for media loaded with solids.
Designs:
– 821S
ATEX on request (depends on parameters)
All sizes are available in inch too
It is not allowed to use all max. parameters at the same time!

High quality, standard pump double cartridge mechanical seal, solid components, self aligning, stationary
Designs:
– 807S
– 807AS according to API 682 – MOL pumps, TA air applications
All sizes are available in inch too
It is not allowed to use all max. parameters at the same time!

Pump mechanical seal. on the product side metal bellows, on the atmospheric side stationary secondary seal, leads to high temperature applications and corrosion resistance
Designs:
– 741S (e.g outside of DIN24960C)
All sizes are available in inch too
It is not allowed to use all max. parameters at the same time!

Pump metal bellows mechanical seal according to DIN EN 12756 of the highest quality, flexible, high tightness even in the vacuum range, very long service life. Coordinated design and materials are important prerequisites for proper operation in the upper temperature range.
Other versions:
– 270 Single-acting metal bellows seal as cartridge unit
– 700H High-temperature version up to 400°C (component GLRD)
– 700SA High-temperature version cartridge, quench according to API 682 C1
– 770/711 Tandem double mechanical seal (see special seals/pumps/heat transfer oil). 700S – Single cartridge mechanical seal (heat transfer oil)
– 790/791/792 Special versions for twin screw extruders (heat transfer oil)
– 875A Double acting high temperature version cartridge unit, according to API 682
700 – Min. temperature: -50°C; Max. temperature: 220°C
Sizes also available in inch sizes
Not all max. values may be used at the same time!