Fluid delivered by pump 1 passes through flow regulator 2 to reducing valves 3. Valve member 4 of reducing valve 3 is subject to the pressure of the entering fluid below, and to the pressure of the fluid in chamber a above. Also acting from above through pusher b is the force exerted by elastic diaphragm 5, which is subject to the constant pressure of spring 6 and the variable pressure of the fluid in chamber f. Chamber f is connected by holes to chamber a. Upon an increase in pressure in chamber a, the total force acting on valve member 4 from below becomes more than that acting above because the area of the diaphragm is greater than that of member 4. Diaphragm 5 is bent upward, valve member 4 is raised by the pressure of the fluid, reducing the clear opening. This throttling effect reduces the pressure in chamber a.
$4049$EHP,Va$