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D200 Rotary ring from monolithic graphite, unbalanced, with a central spring, dependent on the direction of rotation.
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D300 Rotary ring from monolithic metal, unbalanced, with a central spring, dependent on the direction of rotation.
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D320 Rotary ring with pressing mounted graphite ring unbalanced, with a central spring, dependent on the direction of rotation.
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D377 Rotary and stationary rings with pressing mounted tungsten carbide rings, unbalanced, with a central spring, dependent on the direction of rotation.
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D3_ _S Unbalanced, with a central spring, dependent on the direction of rotation.
Stationary ring could be fixed or not fixed with pin against turning.
The combination between rings of D300, D320 and D377 are used.
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D3C Unbalanced, with a central spring, dependent on the direction of rotation. Rotary ring and Stationary ring are interchangeable.
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D6CH Multiple hidden springs construction, unbalanced, not dependant on the direction of rotation.
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D7_ _ Multiple hidden springs construction, unbalanced, not dependant on the direction of rotation.
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D7P Multiple hidden springs construction, balanced, not dependant on the direction of rotation.
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D7_ _S è D7_ _SP Multiple hidden springs construction, unbalanced, not dependant on the direction of rotation. The stationary ring is locked with pin.
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D8C Sealing assembly type “Cartridge”.
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D9B Construction with rubber bellow, with a central spring, unbalanced, not dependant on the direction of rotation.
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D9F Construction with rubber bellow, with a central spring, unbalanced, not dependant on the direction of rotation.
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D9G Construction with rubber bellow, with a central spring, unbalanced, dependant on the direction of rotation.
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D9K Construction with rubber bellow, with a central spring, unbalanced, not dependant on the direction of rotation.
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H9XH Construction with rubber bellow, with a central spring, unbalanced, not dependant on the direction of rotation.
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H9.55 Rotary ring made by Teflon with 15% graphite filler, unbalanced, not dependent on the direction of rotation. Stationary ring are from ceramics.
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H10 Rotary body with bellow and pressed ring, stationary ring –from SiC, unbalanced, not dependant on the direction of rotation.
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H11 Rotary body with bellow and pressed carbon ring, unbalanced, not dependant on the direction of rotation.
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