Introduction A pump discharge check valve must allow forward flow with acceptable pressure loss and close before reverse velocity becomes severe. If the valve closes too late, the disc or closure can slam into the seat after flow reversal, producing pressure surges, vibration, noise, and repeated me...
Introduction A dual plate wafer check valve is compact, light, and suitable for installation between pipeline flanges, but its service life depends on more than the body material shown on a data sheet. The body, plates, hinge and stop pins, springs, seat, coating, and fasteners all face different co...
Dual plate wafer check valves and axial flow check valves both prevent reverse flow, but they solve different piping problems. A dual plate wafer design is compact, relatively light, and economical across many water, utility, and process services. An axial flow design uses a streamlined flow path an...
Introduction A correctly sized valve can still perform poorly when it is installed against its intended flow direction or in an orientation that prevents reliable operation. Direction concerns the way fluid passes through the valve. Orientation concerns the physical position of the body, stem, actua...
Introduction Selecting an industrial valve is not only a matter of matching the pipe size. A valve must match the function of the line, the operating pressure and temperature, the medium, the required shutoff performance, and the way the operator or actuator will use the valve over its service life....
Introduction Pressure class is one of the first details buyers see in an industrial valve specification, but it is also one of the easiest details to misunderstand. A valve marked Class 150, Class 300, Class 600, Class 800, Class 1500, or Class 2500 does not mean the valve can always work at that ex...
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