WATSON 1-1/2" NPT PRESSURE REGULATING VALVE WITH SPRING RANGE
The 403 Series pilot-operated (piston-actuated) pressure regulating valves are used for pressure reduction on steam mains and other process equipment. Pilot-operated regulators will maintain a constant and accurate downstream pressure regardless of fluctuations in supply pressure or usage. These regulators can be supplied with an optional internal sensing line which simplifies installation. Piston-actuated regulators are more compact than Diaphragm-actuated regulators. The 403 Series contains all stainless steel internals for high-pressure applications up to 450 PSIG. The Double-Spring option is available for a wider range of reduced pressures.
The 403-series Pilot operated regulator minimizes outlet pressure fluctuations even when load variesInternal Sensing option (if requested , the regulator can be modified to internally sense pressure , eliminating the need for an external sensing lineDuctile Iron body to handle increased temperature and pressure up to 450 PSIHardened 420 SS seat and discs for extended service life
The 403 piston-actuated pressure regulating valves contain a separate pilot valve which is mounted on top of the main valve. The valve senses the downstream pressure (low pressure side) and precisely modulates a small amount of steam from the upstream side (high pressure side) to the top of the piston chamber, which in turn controls the opening of the main valve. When steam demand increases and downstream pressure starts to drop, the valve is opened further, allowing for additional flow. These regulators have increased accuracy and consistency of set pressure when compared to the Direct-operated type. Set pressure is more stable and will only vary a few percent over the full flow range.
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