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发布时间:2022-01-26 10:35:00 来源:鹏王五金网


阀门安装技巧简介 2011年12月02日 来源:   焊接与银钎焊SOLDERING AND SILVER BRAZING


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.

1.先沿着垂直方向切割管道,并修整、去除毛刺,测量管径。Cut tube end square. Ream, burr and size.

2.使用纱布或钢丝刷清除管道和切割部位,使其金属表面发光发亮。建议不要使用钢丝绒。Use sand cloth or steel wire brush to clean both ends to a bright metal finish. Steel wool is notrecommended.

3.在管道的外面和焊接罩的内部涂上焊剂,焊剂必须完全覆盖焊接表面。请有节制地使用焊剂。Apply flux to outside of tube and inside of solder cup. Surfaces to be joined must be completely covered. Use flux sparingly.

4.要确保阀门处于开启状态。先对管道加热。尽可能多的将热从管道传递到阀门。避免延长阀门本身的加热时间。Be sure that valve is fully open. Apply heat to tube first. Transfer as much heat as possible through tube into valve. Avoid prolonged heating of valve itself.

5.银钎焊的方法:对需要进行钎焊的部件进行组装。如果允许涂上焊剂的部件处于直立状态,那么焊剂中的水分会蒸发掉,而干燥的焊剂很容易脱落,致使暴露的金属表面容易被氧化。在进行连接组装时,要将管道插入管套直到遇到阻挡为止。组装是要保证有稳固的支撑,使得整个钎焊操作过程中能够保持在直线位置。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: 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 pre-heating of the whole socket area is recommended. Apply heat to parts to be joined. The preferred method is by oxy-acetylene flame. Heat tube first, beginning one inch from edge of valve. Sweep flame around tube in short strokes up and down at right angles to run of tube. To avoid burning through tube, the flame should be in continuous motion and not allowed to remain on any one point.

在阀门的套筒底座用火焰进行烘烤。加热要均匀,用火焰对阀门及管道进行火焰烘烤的过程要延续到阀门上的焊剂不再发出声音。不要对阀门过度加热。  Apply flame to valve at base of socket. Heat uniformly, sweeping flame from valve to tube until flux on valve becomes quiet. Avoid excessive heating of valve.


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.进口计量泵


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 past tube stop and clog sealing area. When joint is filled, a continuous run of solder or brazing alloy will be visible.

7.银钎焊法:将焊线或焊杆点在阀门里的管道套座上。当焊杆或焊线进入连接处时要将火焰从其上面移开。当合金流进连接处时,要前后移动火焰。达到适当的温度后,合金将迅速容易地流进管道外壳和阀门套管之间的空间。连接处被充满后,就会看到焊接合金的边缘。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 flame back and forth as alloy is drawn into 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.

8.当焊料处于粘滞状态时,用刷子把多余的焊料清除干净。焊料冷却后,将一条嵌条环绕在阀门的端口。Remove excess solder with small brush while plastic, leaving a fillet around end of valve as it cools.



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: 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 fluxes, leaving bare spots which oxidize and result in voids and inclusions.



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 threading pipe, gauge pipe threads for size and length to avoid jamming pipe against seat and disc. Thoroughly 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, neveron valve threads. Do not allow any pipe dope into valve body in order to avoid damage to disc and seat.


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. After installation of valve, support line; a sagging pipe line can distort valve and cause failure.



There are several steps to follow to make sure that a flanged joint will be properly assembled. First, clean the joint carefully. 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 eliminate concentrated stresses. The bolts should be checked for tightness after an appropriate interval of use and retightened if nec