Raschig - Model RJ-SVG -Fixed Valve

The RJ-SVG valve is a fixed unit punched out of the tray deck at a fixed vertical curtain distance. The valve consists of 2 legs formed integrally with the tray deck. The fixed nature of the valve unit implies an operating range flexibility similar to that for sieve trays. The main advantage of fixed valves is that the high horizontal vapour velocity issuing through the narrow curtain area promotes intense radial mixing with the cross-flowing liquid and deflects entrainment sideways before being swept upwards. Furthermore the vapour flow creates a sweeping action along the tray floor which eliminates deposits of solid salts, and is therefore desirable for fouling applications. The advantage compared to the RJ-VO valve is the fact that weeping is minimized because the leg facing the flow direction of the liquid phase prevents liquid entering the free area. Also the RJ-SVG has no moving parts which makes it suitable for corrosive media.