﻿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). 



