DB Series
The “double block and bleed” knife gate valve was specially developed for applications using hazardous media. The DB model is a single valve with two seat areas. In the closed position, these provide a seal against pressure from both ends of the valve, and there are purge ports to flush the cavity between the seat areas. The DB model thus makes complex and costly multiple valve systems redundant. In spite of these cost benefits, it offers zero leakage protection in difficult applications.
CHARACTERISTICS DB Series
Nominal sizes
Material
Pressure rating
Flange drilling
Face to face dimension
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Two gates provide additional security. The medium can be flushed out in the gap between them.
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Robust 4-post topwork for maximum load and a wide variety of actuator types.
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A unique transverse seal, consisting of a transverse seal profile and packing compound, makes the body bubble-tight towards the atmosphere.
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The transverse seal can be repacked at any time and under full pressure using the lateral packing screws.
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In the closed end position, the gate is also mechanically supported.
Application areas
Pulp and paper industry
e.g.
Chemical solutions, bleaching agents
...
MATERIAL OF CONSTRUCTION
| Part | Stainless steel | |
| Body | Edelstahl CF8M | |
| Gate | 1.4404* | |
| Seal | Aflas | |
| Topwork | Carbon steel | |
| Stem / Piston rod | 430F |
Other materials upon request
* hard chromed
CORROSION PROTECTION
| Topwork |
2 Comp. Epoxy-Polyamide Resin Primer, 2 Comp. Polyurethane-Enamel-Top Coat |
|
| Screws | Stainless steel | |
ACTUATORS
Handwheel
Bevel gear
Pneumatic cylinder
Hydraulic cylinder
Electric actuator
General documents
CAD files
