Bui. 1136, U, S. Dept. of Agriculture. 
PLATE IV. 
A Reducing Valve with a Metal Bellows (A) and an Adjusting Spring 
in Place of Rubber Diaphragm and Weights. The Low-Pressure 
steam Enters the Bellows at the Top. The Desired Pressure is 
Secured by Turning the Adjusting Nut (B). 
