Motor-operated Valves Research Articles

Automatic isokinetic sampling

An automatic device was constructed for sampling air isokinetically. The automatic feature consists of a motor-operated bypass valve controlled by a Wheatstone bridge. Transducers, sensitive to changes in air velocity, are the sensing elements in the bridge. Experimental results are given in which the controlled sampling velocity was shown to follow changes in wind velocity very accurately.

New Developments in Combination Controls

Abstract This paper deals with combination controls, which present advantages of weight and cost saving which in recent years have been greatly enhanced by the dependability and ruggedness which can be built into them. Small electric motors, developed for aircraft-accessory operation, have permitted the construction of motor-operated valves. Both solenoid- and motor-operated valves now give the aircraft designer a wide choice of control characteristics. New methods and improvements in older types of follow-up systems for hydraulic controls are discussed in the paper.