A ballcock (also balltap or float valve) is a mechanism or machine for filling water tanks, such as those found in flush toilets, while avoiding overflow and (in the event of low water pressure) backflow. The modern ballcock was invented by José Antonio de Alzate y RamÃrez, a Mexican priest and scientist, who described the device in 1790 in the Gaceta de Literatura Méxicana.[1] It consists of a valve connected to a hollow sealed float by means of a lever, mounted near the top of the tank. The float is often ball-shaped, hence the name ballcock. The valve is connected to the incoming water supply, and is opened and closed by the lever which has the float mounted on the end. When the water level rises, the float rises with it; once it rises to a pre-set level, the mechanism forces the lever to close the valve and shut off the water flow. This is an example of negative feedback and of proportional control. Ball Cock, Brass Ball Bibcock, Ballcock Valve, Toilet Ballcock Valve ZHEJIANG KINGSIR VALVE CO., LTD. , https://www.kingsir-valves.com
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In order to satisfy the rapid development of the machine tool profession; and the demand for micro-machining in the optoelectronics industry; the speed of ultra-high-speed aerostatic bearings now exceeds 3 x 10e6 DN; the equivalent speed of the shaft exceeds 150m/s. However, because the bearing's open space ranges from 5 to 20 μm; at such speeds; it is necessary for the air film to have the ability to accept exceptionally high shear rates. The resulting viscous forces contribute to the thermal and dynamic properties of the bearing. There are fatal effects. Loadpoint's newly described successful grooved combination tumbling aerospace bearings overcome this series of problems. /*250*250 was created on 2017/12/25*/ var cpro_id = 'u3171089';
This new depiction improves high-speed operation; there is the ability to add speed limits and stiffness while lowering the operating temperature.
Loadpoint's new depiction is useful to overcome the primary limiting element; to make aerostatic bearings complete faster speeds. Combine aerodynamics with statics;
Loadpoint, a grooved combination tumbling bearing with a spiral grooved roll neck bearing and a spiral groove thrust bearing; can squeeze air into the middle when the bearing rotates. At high speed; this effect of the groove can be modified to a large extent The internal pressure of the bearing is spread; the load and hardness are improved. The spiral groove can also change the speed and gradient of the air film inside the bearing; together reduce the viscous wear of the bearing. Because the viscous wear of the aerospace bearing is proportional to the area and the ground In the same minimum space; the friction of the combined tumbling bearing with groove is smaller than that of the traditional bearing. The higher the speed; the more obvious the advantage is. The difference between the function of the grooved combined tumbling bearing and the traditional aerospace bearing Can clarify this:
Following the addition of speed and shaft; the minimum open space of the bearing drops from 28 um to 16 um. At low speeds; the result is similar to conventional bearings. However, when the speed is as high as 120;000 rev/min; the grooved bearing has significant The advantage; and there is the ability to reach higher speeds. Importantly; the grooved combined roll thrust bearing is the same as the conventional thrust bearing; it has a stop hardness. However, because of the function of the groove; it consumes less energy.
Other; because of the influence of aerodynamics; hardness is added with the addition of speed.
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Combined tumbling bearing to improve spindle speed (1)
Source: China Bearing Network Time: 2013-04-24