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| FDV Valve Deodorizers
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The FDV Valve is designed for installation inside the deodorizer, and is assembled directly on the bottom of the tray.
This mounting permits the fastest possible draining of the trays during stock change and shutdown. The wide, unrestricted opening of the disc allows for a high liquid flow rate. Sealing is ensured by a metallic E seal, assembled in the flat disc and acting against the valve seat. When the valve is closed, the liquid level exerts pressure on the disc, creating a hydrostatic seal against the valve seat. The valve seal consists of a resilient metal convolution in a "floating" mount (pat. pending) that keeps it free from tension.
The surfaces are ground and lapped. This seal can withstand high temperatures and exerts a high sealing pressure. It can also withstand many cycles due to the low-strain elastic deformation. The valve seat is flat and aligned to the bottom of the tray to allow full draining with no liquid pocket. The valve is attached to the bottom of the tray by a flange, so it is easy to install. It is also easy to service and maintain, with access only necessary from above. An important feature of the Alfa Laval FDV Valve is the internal actuator, which uses steam as the pressure medium. This means that there are no external actuators, shafts or sealing
glands, all of which can cause air leakage to the inside of a deodorizer.
The valve is designed for heavy duty operation in continuously running process environments. It requires little maintenance attention because there are few wearing parts. A complete overhaul therefore only involves replacing few wear rings and seals. Recommended overhaul is at 100.000 cycles, or 3 years of operation, whichever comes first. A full set of seals and wearing parts, with tools included, is available as a complete service kit.
An Alfa Laval FDV Valve can be installed in deodorization columns of varying diameters because the valve is seated in a valve ring designed to adapt to the required column tray thickness, while the valve seating remains the same. The valve ring is then welded inside the column, thus forming the bottom of the tray. Each valve is supplied with a pre-assembled control box. Actuated ball valves are used for steam and vacuum. These valves are prepared for manual operation if this should be needed.
Control box
The control box is necessary to guide the steam that controls the FDV Valve. This box contains a pneumatic actuator and two 3-way large-bore steam valves. This avoids any risk of an insufficient supply of steam as well as ensuring that there is ample power to open and close the valve. A strainer (mesh 100) is fitted to prevent dirt and grit from entering and causing wear or damage. Manual overrides (both pneumatic and mechanical) are possible if the control system should fail. The tools for this are attached inside the control box. A position indicator is fitted as standard. Service and maintenance are easy due to the use of special fittings and shut-off valves. If service is needed, it takes short time to replace the entire base plate of the control box. |
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