Double Block & Bleed Isolation
Long gone is the need for expensive double block and bleed systems. FluoroSeal® Double Block and Bleed Valves provide isolation on your line without the combined cost of a complex, multi-valve system.
FluoroSeal® Plug Valves offer double port seals in both directions as well as a sealed isolation of the chamber below the plug and the areas around the plug at 90° to the port openings. A single valve can isolate either upstream or downstream, thus eliminating the need for the traditional two double block valves — a definite reduction in cost and maintenance, especially in processes involving large diameter lines.
To achieve the Double Block and Bleed combination, a drainage connection into the plug cavity is added by drilling and tapping through the bottom of the valve body.
FluoroSeal® Double Block and Bleed valves offer a 1/2” (12.7 mm) drain connection as standard, but other sizes can also be provided. Flexibility in connection size, length, and variety in availability, means that no matter what your space or process, a FluoroSeal®Double Block and Bleed valve will successfully fulfill your isolation needs.
Availability:
- Drainage connection through the bottom of valve body
- Variety of materials from steel to exotic alloys
- Available classes: ANSI 150, 300, 600 and DIN PN 16, 40
- Custom size and length of drain connection
- Double block valve end connections available in Flanged, Socket Weld, Butt Weld, Screw End
The unique WEY Model DB serves as both a Double Block & Bleed valve and a Line Blind. This unique design has two gates operated by one actuator. The gates seal against a combination metal and resilient seat for bi-directional bubble-tight shut-off. The chest and seating areas of the valve are self cleaning. The top “transverse” seal is re-packable while in service under full pressure. The valve is tested and rated for ZERO leakage (liquid or gas) downstream and to atmosphere.
Wey DBB Characteristics:
- Solid 316 SS cast lugged body
- 316 SS hard chrome finished gate
- Aflas seals as standard
- 2" – 24" size
- 150 psi CWP design
- 2" – 12" 150 psi shut-off
- 14" – 24" 90 psi shut-off
- Other body, gate and seal materials available
- All styles of actuators available
The WEY Model DB reduces the number of valves required for a traditional double block & bleed application. Reducing the number of valves required eliminates additional leak paths due to multiple flange connections and costs associated with extra valves and piping requirements. The illustration below compares a typical double block & bleed installation with one utilizing a WEY Model DB.