Be sure to remember that recommended the use of the valve is, and applied to analyze the environment in order to determine the most suitable for what kind of valve installation. The valve is installed correctly before, in order to prevent damage to valves, and to ensure that the work and give full play to the performance of valves, please read the installation guide. 1. First cutting along the vertical pipe, and trim to remove burrs, diameter measurement.
2. The use of gauze or wire brush to remove parts of pipelines and cutting its shiny metal surface luminescence. Do not use steel wool recommendations.
3. In the pipeline and welding mask outside painted the internal flux, soldering flux must be completely covered surface. Please use the controlled flux.
4. To ensure that the valve is open. First heating of pipelines. As much as possible heat transfer to the valve from the pipeline. Avoid extending the heating time of the valve itself.
4a. Silver brazing methods:
Brazing of the need for assembly of parts. If allowed to apply the components in the vertical flux, and then the flux of water will be evaporated, and the flux is very easy to dry off, resulting in exposure of the metal surface is oxidized easily. In connection assembly, the pipe to insert the tube until the encounter sets up to block. Assembly is to ensure a solid support, making the whole process of brazing operation can be maintained in a straight line position.
Note: For 1-inch or greater nominal diameter of the valves, one-time components will be connected to the desired heating temperature more difficult. Throughout a large area in order to maintain a normal temperature, usually requires two torch. The proposed tube sets of the entire region of the warm-up properly. Proposed to use acetylene flame heating of the connecting parts. First, from 1 inch away from the valve where the start of the heating pipes, and then around the turn of pipe a short distance down the flame on the pipe baking, and the angle of rotation to the appropriate channels, to avoid pipeline燃脱. Flame to be continuous movement, not allowed to stay at some point.
Sleeve in the valve base with flame to bake. To be evenly heated by the flame of the valves and piping to carry out the process of baking the flames to extend to the flux valve is no longer sound. Do not over-heating of the valve.
When the flux into a liquid and in the pipes and valves on a semi-transparent state, the beginning of the flame along the axis connecting parts to act in baking, in order to maintain connectivity components, particularly parts of the valve sleeve heat base.
5. The use of an appropriate amount of solder: If you use solder wire, then DN 3 / 4 inch valve will be using 3 / 4 inches of solder, and so on. If you are using too much solder, then solder some pipes may flow to block the site, and plug the sealed area. Connected components in the installation, you can see the solder and brazing alloys continue to flow
5a. Silver brazing method:
The wire or welding rod in the valve seat in the pipeline sets. When the welding rod or wire into the junction when the flames from above to remove. When the alloy flowing into the junction, it is necessary to move the flame around. Achieve the appropriate temperature, the alloy will easily prompt shell and pipes into the space between the valve casing. After the junction was filled with, you will see the edge of welding alloy.
6. When the solder in a viscous state, the use of brushes to clean excess solder. Solder after cooling to a嵌条around the port in the valve.
Silver Brazing
If using different brazing materials, its strength brazing connections and not very good, the strength depends on the pipeline between the shell casing with a normal valve, a wide range of cleaning maintenance. Silver brazing valve casing internal diameter of mechanical tolerances and surface smoothness requirements of very precise in order to ensure that adequate adhesion.
Note: in the clean-up and removal process, should be observed carefully cleaning medium residues. Have been soiled or incorrect to carry out cleaning of the surface, brazing, welding it is difficult to satisfactory results, because silver brazing alloys will not flow through or bond in the oxides on the surface of the oil pollution and exposure, easily oxidized and lead to exclusion of the gap flux and debris.
Thread connection
Hard residue, dirt, or any external material accumulated in the pipeline are likely to prejudice the efficiency of the valve and severe damage to key components of the valve. Air or steam must be used within the pipeline to carry out thorough cleansing.
When tapping on the pipes, the pipes to the determination of the size and length of thread, to avoid the pipeline filled and the valve seat.
Thread the end of a thorough cleaning to remove any harmful steel or iron sediments. If you want a more solid when the welding, it is necessary to use Teflon tape or pipe adhesive. Thread in the pipeline can only use a small amount of adhesive pipe, but the valve must not use thread adhesives pipeline. Do not let any adhesive inflow pipe valve body in order to avoid damage to valves and valve seat.
Before installing, cut off the fluid through the valve so that the valve is working correctly. To completely shut down before installing the valve. Will be near the pipe wrench sets the hexagon bolt heads to avoid possible deformation. After the installation of valves, it is necessary to support living Pipeline: valve prolapse of the pipeline would generate a result of the failure deformation.
Flange connection
In order to ensure that the correct valve Lan connection to install, need to follow the following steps. First of all, carefully cleaning junction, and then, at the base of the Department of loosely fitted with two or three bolts. Then, carefully insert the gasket connection. Contribute to the gasket at the bottom of bolt position and to maintain proper position. And then insert the bolts to be tightened up and the use of cross-way, do not adopt the way around the tightened up, so help to eliminate the pressure of over-centralized). In normal use for some time, check to check whether all the bolts tightened and then tightened up and the necessary.
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