Faba bellows-sealed valves have tight shut-off
An
ARI Armaturen product story
Edited by the Engineeringtalk editorial team
Aug 10, 2009
ARI-Armaturen UK has launched its latest range of Faba bellows-sealed valves, featuring three versions with more than 17,000 variants.
All variants incorporate technology that guarantees better performance, 100 per cent tight shut-off and extended service life.
FABA bellows-sealed valves incorporate technology that is said to guarantee 100 per cent tight shut-off and extended service life
The tight shut-off is achieved by the marginal seat arrangement, which has several important new features.
The angle of the seat and the angle of the plug are slightly different, resulting in a very narrow sealing area.
The narrow contact means that the force provided by the handwheel/spindle is concentrated over a very small area, resulting in very high sealing pressure.
The fine thread on the spindle increases this force even further.
The difference in angles and the high pressure means that any dirt that adheres to the seat is dislodged.
To handle the high sealing pressure, high-specification materials have been used for the seat, plug and spindle throughout the Faba range.
The Faba-Plus is designed for all standard applications and features a reinforced bellows welded to the stem rather than to the plug.
A new bonnet design makes it lighter and more resistant to water hammer and options include a spring and loose regulating plug, which allows the Faba to be used as a combined check valve/stop valve.
The return spring also allows the valve to be installed in any position plus a limit switch can be attached to provide remote indication of valve position.
The Faba-Supra I is for arduous industrial applications.
Features include a reinforced bellows welded to the stem rather than to the plug and a two-bolt emergency gland design.
A combined shroud and guide welded to the valve body provides even better protection from water hammer, improved plug stability for greater toleration of high differential pressures as well as a backseat for extra security.
The Faba-Supra C is specially designed for the chemical industry and again features a reinforced bellows welded to the stem of the valve and a two-bolt emergency gland design.
A guided plug improves plug stability and allows greater differential pressures and a two-piece spindle assembly gives the option of retrofitting a pneumatic actuator.
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