Mechanical linkage

The actuator contains the final orifice and a finger pad or mechanical linkage for on—off control. The spray pattern is largely affected by the constmction of the actuator, particularly by the chamber preceding the orifice. Actuators are often termed mechanical breakup and nonmechanical breakup depending upon the complexity of this chamber. Mechanical breakup actuators are of more expensive two-piece constmction. Actuators are usually molded from polyethylene or polypropylene the breakup insert may be almost any material, including metal. 

Figure 10-52 shows a high-capacity 22.7-mVh (100-gal/min) pump with actuation provided by a mechanical linkage. 

Louver Failure - Inadvertent louver closure may result from automatic control failure or mechanical linkage failure. The effect on heat transfer will depend on the degree of restriction to air flow in the closed position and the configuration of louvers in relation to tube bundles (e.g., louvers may not be installed over all tube bundles in a given service). 

Stii facc-following devices use a mechanical linkage between two floating objects or between a floating and a fixed object to produce useful mechanical power. This mechanical power can either be connected directly to a generator or transferred to a working fluid, such as water or air, which drives a turbine generator. 

Optical-alignment systems offer several advantages. Because laser fixtures eliminate the mechanical linkage and runout gages, there is no fixture sag. This greatly increases the accuracy and repeatability of the data obtained using this method. 

A thermo-expansion FW regulator is employed on larger WT boilers when FW pumps run continuously. The thermo-expansion regulator uses a thermostat located at the steam-water interface NOWL. The device expands when the water level drops because it is surrounded by (higher temperature) steam. This expansion moves a mechanical linkage, which opens the valve. 

Accumulation of water, certain vapors, and other materials can damage paint and promote corrosion. Undetected corrosion has led to building collapse, pressure vessel failure, mechanical linkage separation, and electrical breakdown. 

Flow ratio control is essential in processes such as fuel-air mixing, blending, and reactor feed systems. In a two-stream process, for example, each stream will have its own controller, but the signal from the primary controller will go to a ratio control device which adjusts the set point of the other controller. Figure 3.17(a) is an example. Construction of the ratioing device may be an adjustable mechanical linkage or may be entirely pneumatic or electronic. In other two-stream operations, the flow rate of the secondary stream may be controlled by some property of the combined stream, temperature in the case of fuel-air systems or composition or some physical property indicative of the proportions of the two streams. 

G. Bourdon Gauges. As an alternative to mercury manometers there is a variety of gauges based on mechanical or electrical pressure transducers. This section presents a description of purely mechanical gauges which still find use in this electronic age.4 The metal Bourdon gauge (Fig. 7.5) is fashioned around a semicircular thin-walled metal tube with mechanical linkage to a pointer. Fused-quartz spiral gauges are also available. In this case, a thin spiral is sensitive to a pressure differential, and the deflection is balanced with air pressure in the surrounding envelope. The air pressure is then measured with a manometer. 

One of the big challenges in understanding the function of PC2 is finding the physiological activator of the channel. A knowledge of these activators is needed to investigate the mechanism of action of PC2 in normal cells and how alterations in this protein leads to disease. At the present time, only mechanical linkage to PCI and alterations in intracellular Ca2+ are known to activate PC2. 

An AC signal amplifier to amplify the AC signal to a usable level A balancing motor/mechanical linkage assembly to balance the circuit s resistance... 

System pressure is applied to the internal volume of a bellows and mechanical linkage assembly. 

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