Figure 5 (left), Ball valve, and a cross section (right) of the ball valve with a pressure relief.
The closing - opening of the ball valve is a ball with holes punctured. (Red in Figure 5, right) in the middle by a rotation through the hole in the pipeline, it will open the valve fully. And rotation through a hole in the tube is perpendicular to the valve. The flow rates achieved by twisting the ball at an angle between the fully open position and closed position.
Compared to the gate valve to the pipe using the same size ball valve will be larger and heavier. (I was using a ball instead of a flat plate in the closed - open valve), and it requires a wider area around the opening and closing valves. The valves for pipe sizes 6 inches is required to rotate the shaft at a radius of about 1 meter (if I remember correctly) in the closed - open the valve. Some of the larger valve is the problem with the gear drive system with the twisting, turning the ball back and forth. This saves space, but also to reduce the speed to close - open the ball valve is used in the manufacture of the rotating shaft is mounted on the spindle. But it will be removed. Time it takes to wear the crown like a wrench, tighten the nut. Remove the valve stem to rotate the output shaft is rotated so as not to protrude roughly the rotation of the valve is accidentally hit a pedestrian. To see if the valve is open or closed position of the groove so that the notch on the rotating ball. Turn the valve stem is removed. If the valve is often small chains hanging next to the valve, but if the valve is likely to be stored somewhere. Each time you use it to withdraw it.
It has many advantages that ball valve is fully closed or open quickly. High pressure. Works great with a solid, fluid mixing in the case of a ball valve that is used with hazardous fluids or in a system with high pressure. The drill pipes through which the fluid flows through a high pressure, a hole through a small in line perpendicular to the channel for fluid flow (see Figure 5 a) in the valve must be installed. The high pressure valve is turned off to the side to the downstream pressure and / or other chemical residues in water channels away. If no such knowledge. Take-off valve is a pressure / chemical residues in the channel flow. If the valve was left for maintenance, it can cause harm to those who have to disassemble the valve.
ball valve may be used in polymeric materials. (The green light in the picture) is sealed against leakage between the valve body with the ball. The polymer material that will withstand high temperatures, but not metal. Thus, the ball valve must be used with regard to temperature, the gate valve is not enough polymer material to seal the leak. The high temperature applications as well.
One experience that had come with ball valve in the lab is to remove the valve stem to rotate out of the control panel. Turn the valve stem, but the recovery was not sure that the valve stem is inserted into the corresponding position on the ball or not. The result is that when the shaft is rotated in line with the pipeline valve in the closed position. (Must be in open position) and when the shaft rotates in a perpendicular to the pipe, valves, back in the open position. (That is to be placed in the closed position) and re-insert the stick is not well positioned. (A notch to fit their groove before) they're ridiculously pumped into use. The valve stem is in the closed position the valve so the gas to leak out. The results have a problem at all.
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