SPM® choke valves, available in adjustable or positive models, restrict flow by reducing the flow area in the valve body to achieve the desired flow rate.
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Adjustable choke valves use a stem and seat combination to control flow rate. Rate of flow can be adjusted by turning a hand wheel to achieve the calibrated orifice size and associated flow coefficient. An easy-to-read indicator, aligned with the V-notch machined onto the bonnet top, shows orifice size, and allows calibration in 1/64 inch increments.
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Positive choke valves provide a fixed flow rate by using a choke bean. Flow rate is controlled by selecting a choke bean orifice size. These choke valves are manufactured in 2-inch and 3-inch sizes for operating pressures up to 15,000 psi.
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