NVS-2 Integral Carbon Floating Ring Seal|Spring-Loaded Sealing Face Design

NVS-2 is a dry-running carbon floating ring seal designed to replace labyrinth seals and packing seals. It features an integral design that requires bearing housing disassembly for installation. End-face springs apply axial force to the sealing rings, maintaining face contact and helping reduce leakage. The springs on the radial ensure positive engagement of the split faces, maintaining sealing integrity during operation. It is primarily used in gas-handling equipment such as centrifugal fans, Roots blowers, and low-pressure steam fans.

Operating Parameters:

Pressure: 0~4Mpa

Temperature: -100~500℃

Linear velocity: ≤300m/s

Shaft size : 30~800mm

Radial play: ≥±1.5 mm

Axial movement: theoretically unlimited

Material:

Metal parts: 1Cr13,304,316L,2205,2507, TA2,C276

Seal ring: Graphite compound, PTFE compound

Elastomer ring: FKM,EPDM,PTFE,FFKM

Spring: 316L,Hastelloy C

Description

NVS-2 is a dry-running carbon floating ring seal, mainly consisting of an integral end cover, a shaft sleeve, and seal rings. The seal rings feature a multiple spring design on the sealing faces, using both process pressure and spring force to achieve face contact and reduce leakage.The NVS-2 have self-adjusting carbon rings ensure stable sealing performance during operation.

Features

Integral housing structure
Carbon rings with multiple spring
Extremely small operating clearance for minimized leakage
Non-contact, dry-running operation
Seal rings automatically adapt to operating conditions

Configuration Selection

Select the number of sealing rings according to the application conditions:

NVS-2-II: Two sets of floating rings, suitable for air or gases where leakage requirements are not stringent.
NVS-2-III: Three sets of floating rings, suitable for general non-hazardous process gases.
NVS-2-IV: Four sets of floating rings, suitable for low-pressure, low-hazard process gases.
NVS-2-V: Five sets of floating rings, suitable for low-pressure steam and hazardous process gases.
NVS-2-VI: Six sets of floating rings, suitable for low-pressure steam and medium- to low-pressure hazardous process gases.
NVS-2-VII: Seven sets of floating rings, suitable for medium- to low-pressure steam and hazardous process gases.