The valve box may be interfering with the wrench nut socket/tool. Look down the valve box to see if it is too close to the wrench nut. Reposition if necessary. Alternatively, the stuffing box bolts and nuts may have been tightened down unevenly during assembly. If that is the case, loosen and retighten stuffing box bolts and nuts evenly. In addition, debris or corrosion may have built up between the stem and stuffing box due to lack of operation or gritty backfill. This requires removal of the stuffing box (stem if needed) and cleaning and/or replacement of the stem and stuffing box. Lastly, debris could have wedged under the disc. Expose the valve. Isolate the valve from flow and relieve pressure. Remove the bonnet. Clean out the debris.
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Threaded connections are very common. They provide a compact and streamlined connection between the valve and pipe.
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The valve typically has female threaded end connections, into which the male threaded pipe fits. There are valves with male threaded connections as well, and even valves with one female end and one male end. Threaded connections must adhere to a standard in order to be useful in industry. There are a few different standards that exist. The valve and pipe must both be created using the same standard in order for them to make a proper connection.
There are standards for straight threads and some for tapered. Tapered threads provide a fluid tight seal without the use of a soft seal like an o-ring or flat washer. Straight threads do require a soft seal that gets compressed between the valve and pipe, hose, or fitting that they are being connected to.
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