Zwicky Reducing Valves
Controlled Pressure Reducing Valve
This valve controls the flow of oil through it according to the pressure at its outlet side. Thus downstream of it there can be maintained a constant and pre-determined fluid pressure regardless of the rate of flow, pressure or viscosity at which fuel enters the valve at its inlet side.
The valve spring is loaded open. After the flow of fuel oil begins the valve remains fully open unitl the fluid pressure downstream of the valve rises to the pre-determined datum level at which it is to be stabilised. Any further increase of pressure at the outlet diaphragm closing the balanced valve against its spring loading. Thus at the ruling rate of flow, the pressure at the outlet side of the valve is stabilised at the datum level pressure for which the valve is set.
Any subsequent variations in the inlet pressure or rate of flow will cause similar and instantaneous compensating adjustments to the valve opening, always to maintain the outlet pressure at its datum level.
Standard Valves up to and including
- 3/4" Valve : 4 psi (0.3 Bar) to 80 psi (5.5Bar)
- 1" and above : 4 psi (0.3 Bar) to 60 psi (4 Bar)
This is obtained by a series of springs, therefore control pressure must be specified when ordering.
Spring Ranges Available
- 3/8" to 3/4" Standard : 4-9, 5-25, 25-50, 20-35, 50-80 psi.
- 1" to 2" Standard : 4-9, 5-20, 20-35, 30-40, 35-50, 45-60 psi.
- 1" to 2" High Pressure : 60-80 psi.
- 0-3000 g.p.h.
Standard Pipe Sizes
- 3/4", 1" and 11/2" BSP Female. 2" Flanged
- 150 psi (10 Bar)
- 100 psi (7 Bar)
The maximum continuous working temperature of the standard range of valves is 170°C (388°F)