Valves channel

The rectangular element valve, as the name implies, uses rectangular-shaped sealing elements. These valves are the feather valve, channel valve, and the reed valve. These valves are applied to the industrial air machines for the most part. A channel valve is shown in Figure 3-10. 

Figure 3-10. An exploded view of a cushioned channel valve. Courtesy of Dresser-Rand)...

The best compressor valves for any service selected from the unmatched Dresser-Rand line, including famous gas-cushioned Channel Valves. 

Figure 11-15. Channel valves. (Courtesy of Ingersoll-Rand Company.)...

Figure 12-6F. Ring channel valves. (Used by permission Cooper-Cameron Corporation.)...

The channel valve shown in Figure 36.10 is widely used in mid- to large-sized compressors. This valve uses a series of separate stainless steel channels. As explained in... 

The leaf valve (see Figure 36.11) has a configuration somewhat like the channel valve. It is made of flat-strip steel that opens against an arched stop plate. This results in valve flexing only at its center with maximum lift. The valve operates as its own spring. 

Miniaturized fluid handling devices have recently attracted considerable interest and gained importance in many areas of analytical chemistry and the biological sciences [50], Such microfluidic chips perform a variety of functions, ranging from analysis of biological macromolecules [51, 52] to catalysis of reactions and sensing in the gas phase [53, 54], They commonly consist of channels, valves and reaction... 

Fig. 1. Free enzymes FIA system 1, enzymes and reagents solution 2, sample solution 3, buffer solution 4, peristaltic pump 5, three-channel valve 6, six-channel injection valve 7, colorimeter 8, computer 9, waste 10, coil.

To minimize vapor channeling, valve trays are designed to exceed a minimum unit reference (50). A unit reference is the ratio of the vapor rate to the vapor rate at which all the valves are open (Sec. 6.3.2). A minimum unit reference of 40, 60, and 80 percent is recommended for one-, two-, and four-pass trays, respectively (50). If the unit reference falls below the minimum, selected valves can be blanked, valve density can be reduced, or the ratio of light to heavy valves can be varied (7,50). 

Perhaps the first line of investigation should be a mechanical evaluation of the system to rule out causes such as instrumentation or valves. Typical investigations include an instrument check they should be tested and calibrated. Filters should be checked for channeling. Valves should be checked to determine if they are functioning properly. Filters and softeners should be checked to determine whether the specific flow rate or flux is within design guidelines. 

M. Blanco, J. Coello, H. Iturriaga, S. Maspoch, J. Riba, Modification of a commercial dual channel valve to be used in a stopped-flow injection analysis system, J. Flow Injection Anal. 7 (1990) 3. 

Tlie technological requiiements for designing and constructing microfluidic devices for micro- and nano-technology ai e expanding. A microfluidic platform for the constraction of microscale components and autonomous systems consists of a combination of liquid-phase photopolynierization, lithography, and laminar flow to generate channels, valves, actuators, sensors, and systems. " ... 

A six-channel valve, the various functions of which have been described in detail in Ruzicka and Hansen s book had a design similar to, but even simpler than the eight-channel valve [3]. All its functions could be performed equally well using the 8-channel valve, but not vice versa. 

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