Category: Valve

Socket-Welding Procedure

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The procedure for making a socket weld is as follows: 1. Cut the pipe end square, making sure the diameter is not undersize or out of round. 2. Remove all burrs with a metal file. 3. Clean the pipe end, valve joint, and the inside of the valve socket with a degreasing agent to remove …

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Butt-Welding Procedure

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The procedure for making a butt weld is as follows: 1. Machine the pipe ends for the butt-welding joint. 2. Clean the pipe ends, valve joint, and the inside of the valve socket with a degreasing agent to remove oil, grease, or other foreign materials. 3. Align by means of fixtures, and tack weld in …

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Soldering or Silver-Brazing Procedure

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The basic procedure for soldering or silver-brazing pipe or tubing to valves is as follows: 1. Cut the tube or pipe end square, and make sure the diameter is not undersize or out of round. 2. Remove all burrs with a metal file. 3. Clean the pipe or tubing end (at least to the depth …

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Valve Installing Pointers

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Valve Installing Pointers

Unless valves are installed properly, they will not operate efficiently and can cause problems in the system. There are certain precautions you should take when installing valves that will improve their performance and minimize the possibilities of a malfunction. These precautions may be summarized as follows: 1. Always clean out a valve before installation because …

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Damaged Valve Stems

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Sometimes the threads on valve stems become worn or damaged, making the valves inoperable. When this occurs, the stems must be replaced. Before the stem can be replaced, however, all pressure must be removed. Then, with pressure removed, disconnect and remove the bonnet and upper valve assembly. The remainder of the procedure depends on the …

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Valve Seat Leakage

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Leakage of water from the valve body is usually an indication that the wedge, disc, or seat ring needs replacing. For most valves, the procedure for doing this may be summarized as follows: 1. Open the valve. 2. Remove the bonnet and other components of the upper valve assembly. 3. Run the stem down by …

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Valve Stuffing-Box Leakage

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Leakage around the valve stuffing box is usually an indication that the stuffing must be adjusted or replaced. This leakage does not occur when the valve is completely opened or closed. Therefore, an absence of leakage is not necessarily an indication that the valve is functioning normally. Once you have detected leakage, check first to …

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