Circular V-valve

An integral CFB (ICFB) was thus proposed to combine the four major component parts in a single concentric-tube structure the fast bed, a circular V-valve (CV-valve), an internal multi-inlet cyclone and its dipleg (Liu, 1990 Kwauk et al, 1991). 

For the annular-fast-bed design shown in Fig. 35a, solid particles elutriated from the fast bed are separated in a multi-inlet cyclone (MIC) they then descend through a mildly fluidized dipleg and are recirculated to the fast bed via a circular V-valve (CV-valve). Fluidizing air is supplied separately to the fast bed and the dipleg. 

The V-valve (Fig. 24) is a close relative of the loop seal and also acts as an automatic flow device at the base of standpipes operating in the overflow mode (Li et. al., 1982). The V-valve consists of an angled diverging section connected to a standpipe A circular aperture in... 

Rotary V lve Feeders. Devices known as rotary valve feeders are commonly used for circular or square configured outlets. These are particularly useful when discharging materials to a pneumatic conveying system where a seal is required to prevent air flow through the hopper outlet. The discharge rate is set by the speed of rotation of the vanes or pockets of the valve. 

The system is based on an XP Zymate laboratory robot controlled with a 10 slot System V controller using software version XP VI.S2. The system incorporates commerdaUy available hardware, as well as custom hardware. A schematic diagram of the system is shown in Fig. 6.11. The robotic arm and the peripheral laboratory stations that the robotic arm interacts with to perform the appHcation are positioned in a circular configuration. The GC/MS is located adjacent to the bench top, such that the injection valve is close to the sipper station. Peripheral items of hardware with which the robotic arm does not directly interact with are outside the working envelope. 

The demonstrator analyzing system contains two thermo-pneumatic actuated micropumps (see Fig. 7). The micropumps are of the reciprocating type and consist of three main building blocks a thermo pneumatic actuator (A), a pump chamber with a flexible pump membrane which acts as a capacitor (C) and two passive circular silicon check valves (V), see Fig. 21. 

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