SOLDERING AND SILVER BRAZING Be sure to remember what the recommended valve is for and analyze the environment in which it is used to determine which valve is best suited for installation. Analyze the application to determine which valve is best suited for installations, keeping in mind the service for which the valve is recommended. Before installing the correct valve, review the installation instructions to prevent damage to the valve and to assure its maximum efficiency: First cut the pipe in a vertical direction and trim to remove burrs and measure the pipe diameter. Ream, burr and size. Use a gauze or wire brush to clear the pipe and cutting area to make the metal surface shiny. It is recommended not to use steel wool. Flux is applied to the outside of the pipe and the inside of the weld shroud and the flux must completely cover the weld surface. Use solder sparingly. Apply flux to outside of tube and inside of solder cup. Surfaces to be joined must be completely covered. Use flux sparingly. To ensure that the valve is open. First pipe heating. As much heat is transferred from the pipe to the valve. Avoid prolonging the heating of the valve itself. Be sure that the valve is fully open. Apply heat to the tube first. Transfer the heat for the first tube into the valve. Avoid prolonged heating of the valve itself. If the solder-coated parts are allowed to stand upright, the moisture in the solder evaporates and the dry solder easily peels off, exposing the exposed metal surfaces to oxidation. When connecting and assembling, insert the pipe into the pipe sleeve until it encounters blockage. Assembly is to ensure a solid support, so that the entire brazing operation can be maintained in a straight line position. Silver Brazing Method: Assemble parts to be brazed. If fluxed parts are allowed to stand, the water in the flux will evaporate, and dried flux is liable to flake off, exposing metal surfaces to oxidation. Assemble joint by inserting tube into socket hard against The stop. The assembly should be firmly supported so that it will remain in alignment during the brazing operation. Note: For valves of 1 inch or more nominal diameter, it may be more difficult to heat the connection part to the desired temperature at once. In order to maintain a normal temperature over a large area, two torches are usually required. It is advisable to preheat the entire jacket area appropriately. It is recommended to heat the connecting parts with acetylene flame. First, heat the pipe 1 inch above the valve and then flame the pipe alternately up and down around the pipe a short distance and rotate the pipe at an appropriate angle to avoid burning through the pipe. Flame to continuous movement, not allowed to stay at a certain point. NOTE: On one-inch and larger valves, it is difficult to bring the whole joint up to temperature at one time. It will frequently be found desirable to use a double-tip torch to maintain the proper temperature over the larger area. A mild The heat method first was started by the oxy-acetylene flame. pre-heating of the whole socket area is recommended. Apply heat to parts to be joined. down at right angles to run of tube. To prevent burning through the tube, the flame should be in continuous motion and not allowed to remain on any one point. Heating should be uniform, with a flame on the valve and pipe flame baking process should be extended to the valve on the flux no longer make a sound. Do not overheat the valve. When the flux becomes liquid and assumes a translucent condition on the pipe and valve, it begins to move the valve to the valve at the base of the socket. The flame advances and retreats along the axis of the connecting part to maintain the heat of the connecting part, especially the valve sleeve base part. When flux appears liquid and transparent on both tube and valve, start sweeping flame back and forth along axis of joint to maintain heat on parts to be joined, especially toward base of valve socket. Use Appropriate Amount of Solder: If using wire solder, then For 3/4 inch nominal valves, 3/4 inch solder is used, and so on. If you use too much solder, some solder may flow through the pipe block and block the seal area. Use just enough solder: with wire solder, use 3/4 "for a 3/4" valve, etc. If too much solder is used, it may flow Silver brazing method: the wire or rod welding point in the valve pipe sleeve seat. When the welding rod or wire into the junction to be removed from the flame above. When the alloy flows into the junction, move the flame back and forth. Once the proper temperature is reached, the alloy will quickly and easily flow into the space between the pipe housing and the valve sleeve. After the connection is full, you will see the edge of the solder alloy. Silver Brazing Method: Apply brazing wire or rod at point where tube enters valve socket. Keep flame away from rod or wire as it is fed into the joint. Move the flame back and forth as alloy is drawn into the joint. When the proper temperature is reached alloy will flow readily into space between tube outer wall and valve socket. When joint is filled, a continuous rim of brazing alloy will be visible.
