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PILOT 2450: Rate of Flow Pilot
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- Pilot is field adjustable (within orifice bore range).
- Large diaphragm area for sensing small changes in differential pressure.
- Hydraulically balanced design for accurate control.
- Specifically designed for rate of flow control.
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INSTALLATION
The 120 is furnished fully factory-assembled and ready for installation at the appropriate point in the system. Install the valve referencing the flow arrow tag. The orifice plate will be in the inlet flange. It is recommended that at least five diameters of straight pipe be allowed upstream of the valve.
PILOT VALVE OPERATION
The model 2450 is a normally-open, double-acting, spring-loaded, diaphragm pilot valve (see illustration). Control piping provides for sensing differential pressure across the valve inlet orifice plate. The upstream (high pressure) side is sensed under the pilot diaphragm; the downstream (low pressure) side over the diaphragm. Closing of the pilot is assisted by the adjustable spring. Flow rate may be changed by the adjusting screw. The pilot is adjustable within a 4:1 ratio, depending on the orifice size used. Variations in pressure differential across the orifice plate produce modulation in the double-acting pilot, which in turn creates a mirror-modulation in the main valve. Increased differential pressure works to close the valve while a drop in such pressure opens it.
- Adjusting Screw Cover
- Adjustment Screw
- Spring
- Diaphragm
- Orifice Plate Low-Pressure Sensing Port
- Orifice Plate High-Pressure Sensing Port
- Pilot Inlet
- Pilot Outlet
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