Functional Description Shaft Sealing [Labyrinth Sealing]; Functional Description Labyrinth [Piston Ring Purge]; Figure 9: Shaft Seal Principle; Figure 10: Piston Ring Purge - Flowserve SIHI dry Standard M Series Instruction & Operation Manual

dry dry
dry dry Standard M Series Dry Running Vacuum Pump Standard Standard Standard
SIHI
Issue Date: November 21, 2016

3.4 Functional Description Shaft Sealing [Labyrinth Sealing]

Figure 9: Shaft Seal Principle

3.5 Functional Description Labyrinth [Piston Ring Purge]

Figure 10: Piston Ring Purge

Copyright: FLOWSERVE SIHI Pumps
In conjunction with the Labyrinth seal, the
purge gas system [see 3.6] is used for
blocking the driving compartment against
the discharge compartment to effectively
ensure that the feeding medium does not
enter the driving compartment.
In conjunction with the Labyrinth seal, the
piston rings are in addition purged with about
10SLM [2.5CFM] to prevent condensation of
condensable. This dilution effect helps to
avoid that process gas will enter motor casing
in the event of abnormal overpressure from
the discharge.
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Flowserve US Inc.
Rev 1