Operation:
The upstream pressure (P1) is introduced below the valve disc, which is opposed to atmospheric pressure via a vent port above the inlet balancing piston.
The downstream pressure (P2) is introduced above the control piston, which is sized to a fixed ratio of the area of the valve disc, and also opposed to atmospheric pressure via the vent port.
The valve will then modulate the flow to maintain a fixed relationship (eg. 5:1) between P1 and P2, governed by the ratio of the respective areas of the valve disc and the control piston.
Materials
Item | Description | Material |
---|---|---|
15 | Body Studs and Nuts | SS |
14 | Upper Spindle Nut | SS |
13 | Piston | SS |
12 | Cover | CI |
11 | Cover 'O' Rings | Nitrile |
10 | Liner 'O' Ring | Nitrile |
9 | Piston 'U' Seal | Nitrile |
8 | Spindle ‘U’ Seal | Nitrile |
7 | Liner | SS |
6 | Spindle | SS |
5 | Seating 'O' Ring | Nitrile |
4 | Retaining Disc | SS |
3 | Lower Spindle Nut | SS |
2 | Valve Seat | SS |
1 | Body | CI |