In general, the common word for a screwdriver is a word and a cross. But the screwdriver model is more than these two. But one thing is certain, the screwdriver has no round head because the round head is not twisted at all. The word is to ensure that there is a twist, and the cross can make the power more evenly distributed.
The screwdriver is divided into a manual screwdriver and an electric screwdriver according to the power source. According to the batch head or the cutter head, there is a word (FLATHEAD) and a cross (PHILLIPS). There are many specifications and models. In the industry, it is basically based on the batch. It has two sizes. One is metric, which is what we often say in MM. Let's say those sizes upstairs. There is also an inch system, it is in inches, such as 1/4, 3/16, this number is 25 is the metric size.
1. The model number of the flat-blade screwdriver is expressed as the width of the cutter bar × the cutter bar. For example, 3×75MM means that the cutter head width is 3MM and the rod length is 75MM (not full length).
2. The model of the Phillips screwdriver is expressed as the size of the cutter head × the cutter bar. For example, 2#×75MM means that the cutter head is No. 2 and the metal rod length is 75 mm (not full length). Some manufacturers use PH2 to indicate 2#, which is actually the same. You can roughly estimate the size of the cutter head by the thickness of the cutter bar, but the industry is distinguished by the size of the cutter head. The metal rods corresponding to the models 0#, 1#, 2#, and 3# are approximately 3.0 mm, 5.0 mm, 6.0 mm, and 8.0 mm.
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Ball valve is evolved from the plug valve, its opening and closing parts as a ball, using the ball to rotate 90 degrees around the axis of the stem to achieve the purpose of opening and closing, the difference is that the cock body is a ball, with a circular through hole or channel through its axis. The ratio of the sphere to the passageway should be such that when the ball is rotated 90 degrees, the inlet and outlet should be completely spherical, thus cutting off the flow.
The role of ball valve in the pipeline is mainly used to cut off, distribute and change the direction of media flow, designed into the V-shaped opening ball valve also has good flow regulation function.
Ball valve is not only simple in structure, good sealing performance, but also in a certain nominal range of small volume, light weight, less material consumption, small installation size, and driving torque is small, easy to operate, easy to realize rapid opening and closing, is one of the fastest developing valve varieties in recent decades. Especially in the United States, Japan, Germany, France, Italy, West, Britain and other industrial developed countries, ball valves are widely used, the variety and number of use is still continuing to expand, and to high temperature, high pressure, large mouth, high sealing, long life, excellent regulatory performance and a valve multifunctional direction, its reliability and other performance indicators have reached a higher level, And has partially replaced Gate Valve, Globe Valve, Regulating Valve.
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