Valve Catalogue » Pressure Reducing Valves » Fig 119 Ratio Pressure Reducing Valve

Technical Information - Fig. 119

The Fig 119 Ratio Pressure Reducing Valve employs a globe type body, is self contained and hydraulically actuated and controlled.

The valve automatically controls the downstream pressure to a ratio of the upstream pressure ( eg. 5:1).

Dimensions:

Valve Size	A	B	C
80	292	105	160
100	356	140	160
150	445	165	260
200	600	205	355

Specifications:

Connections:	Flanged
Working Pressure:	Up to 5000 kPa
Ratios Available :	5:1, 4:1, 3:1, 2:1
Temperature Range: Nitrile seals:	-10°C - 100°C
Viton seals:	-10°C - 130

Materials:

Item	Description	Material
15	Body Studs and Nuts	S.S.
14	Upper Spindle Nut	S.S.
13	Piston	S.S.
12	Cover	C.I.
11	Cover ‘O’ Ring	Nitrile
10	Liner ‘O’ Ring	Nitrile
9	Piston ‘U’ Seal	Nitrile
8	Spindle ‘U’ Seal	Nitrile
7	Liner	S.S.
6	Spindle	S.S.
5	Seating ‘O’ Ring	Nitrile
4	Retaining Disc	S.S.
3	Lower Spindle Nut	S.S.
2	Valve Seat	S.S.
1	Body	C.I.

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.