Layout and function
3.3 Shaft seals
Only one of the following shaft seals can be used.
3.3.1 Mechanical seals
Mechanical seals have functional leaks.
• Single mechanical seal
• Single mechanical seal w ith quenching and upstream
safety stuffing box
3.4 Auxiliary systems
3.4.1 Sealing systems
Only one of the following sealing systems can be used.
Quench ing
123
Fig. 5 Single mechanical seal with quenching
(sketch)
1 Pumped liquid
2 Single mechanical seal
3 Sealing medium (unpressurized)
The pressure of the pumped medium is high er than the pres-
sure of the sealing medium during quenching. The seal sur-
faces are lubricated b y the pumped medium.
Application examples:
• Pumped m edia that can crystallize in the atmosphere and
thus cause damage to the seal in the long-term
• Prevention of offensive odors
• Cooling of seals
Variant
Characteristics of the
sealing medium
Open flow system • Supplied and drained
continuously
• Unpressurized
Closed flow system • Circulates in a closed
circuit
• Unpressurized
Tab. 6 Quenching - variants and characteristics
160-282/0 – 550 154 BA-2017.03 en-US NIT series 11
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