Conval recently announced that its popular Camseal© metal-seated, forged ball valves feature a new Stem Position Indicator Disc for easy, precise on-site identification and inspection of the open-close status of the valve. This is especially important when adding an actuator to a valve or resetting valve actuation in the field. The high-quality severe service valves are available in ½” through 4” sizes with socket weld, butt weld and flanged ends, in pressure classes from ASME 900 through 4500.
The new Stem Position Indicator Disc design (patent pending) is intended to improve the accuracy of the stem and ball alignment into the valve seat. This is important in severe applications such as steam where positive, sustainable shut-off is critical and even slight mis-alignments will compromise the ball/seat sealing band. The indicator is self-securing to the stem. No set screws are required. The new disc eliminates the need for costly and multiple manufacturing features that have traditionally been used with less accuracy. This custom-engineered disc design has shown an alignment improvement of up to 3.5 times over conventional methods of position indication due to the minimization of part tolerance stack-up.