Valve Installation Instructions (Chinese and English)

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 what valve is best suited for installation. Before installing the correct valve, read the installation guide to prevent damage to the valve and to ensure that the valve is fully functional. 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. Cut the pipe vertically 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 too much solder is used, 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 the solder is in a sticky state, the brush is used to remove excess solder. After the solder has cooled down, place a fillet around the port of the valve. SILVER BRAZING SILVER BRAZING If different brazing materials are used, the strength of the brazing connection is not very good, the strength depends on the size of the pipe Housing and valve casing between the normal, a wide range of cleaning and maintenance work. The mechanical tolerances and surface smoothness of the internal diameter of silver-brazed valve bushings are very precise to ensure adequate adhesion. The strength of a brazed joint does not vary appreciably with the different brazing materials, but depends to a large extent upon the maintenance of proper clearance between the outside of the tube and the valve socket. The interior dimensions of silver brazing valve sockets are machined to the closest tolerances and finished smooth to promote full capillary attraction. Note: During cleaning and removal, care should be taken to observe the residue of the cleaning media. Brazing on surfaces that have been soiled or incorrectly cleaned is less than satisfactory because the silver brazing alloy does not flow or adhere to the oxide and the oily surfaces and exposed, Easily oxidized and lead to voids and debris repel solder. NOTE: Care should be observed in cleaning and in removing residues of the cleaning medium. Attempting to braze a contaminated or improperly cleaned surface will result in an unsatisfactory joint. Silver brazing alloys will not flow over or bond to oxides. Oily or greasy surfaces repel THREADING THREADING Dirt, dirt, or any foreign material buildup in the pipe may interfere with the efficiency of the valve and severely damage the valve's critical components. The interior of the pipe must be thoroughly cleaned with air or steam. Grit, dirt or any foreign matter accumulated in the pipe can hinder efficient valve operation and seriously damage vital valve parts. Thoroughly clean pipe internally with air or steam. When tapping pipes, determine the size and length of the pipe threads and avoid Plug the pipe to the seat and disc. Thoroughly clean the thread end to remove any harmful steel or iron deposits. If you want to weld more solid, it is necessary to use Teflon tape or pipe adhesive. Only a small amount of pipe adhesive is used on the pipe threads, but pipe adhesives must not be used on the valve threads. Do not allow any pipe adhesive to flow into the valve body to avoid damage to the disc and seat. Thruoughly clean threaded end to remove any harmful steel or iron deposits. For a good joint, use teflon tape or pipe dope. If pipe dope is used , apply sparingly on pipe threads, never on valve threads. Do not allow any pipe dope into valve body in order to avoid damage to disc and seat. Before installation, shut off the fluid through the valve to allow the valve to function properly. Completely close the valve before installation. Place the wrench over the hexagonal head of the pipe to avoid any possible deformation. After installing the valve, to support the pipeline: the drooping pipe will cause the valve deformation and failure. Before installation, check line of flow through valve so that valve will function properly. Close valve completely before installation. Apply wrench to hex next to pipe and guard against possible distortion. and cause failure. FLANGED FLANGED To ensure proper installation of the flange connection, the following steps need to be followed. Carefully clean the joints first and then loosely attach two or three bolts to the base. Next, carefully insert the gasket into the connection. Bottom bolts help to position the washer and hold it in place. And then insert the bolt to be used to cross-tighten the way, do not use around tightening, which helps to eliminate the over-concentration of pressure). After normal use for a period of time, check that all bolts are tightened and re-tightened as necessary. There are several steps to follow to make sure that a flanged joint will be properly assembled. Then loosely assemble the joint by putting in the bottom two or three bolts. Then carefully insert the gasket into place. The bottom bolts will help locate the gasket and hold it in position. Then insert the rest of the bolts into place and tighten all of the bolts evenly-not in rotation, but by the cross-over method to load the bolts evenly and eliminateduce stresses. The bolts should be checked for tightness after an appropriate interval of use and retightened if necessary.

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