1, multi-function pump control valve Introduction Multi-function pump control valve is a new type of hydraulic control valve, a valve to replace the electric butterfly (gate) valve, check valve and water hammer eliminator three devices. It can automatically open the pump when the slow opening, closing the pump when the closure and slow closure, without any electrical control and other power and manpower, but also without the hydraulic device. The main advantages of the multi-function pump control valve are: (1) no operational control required. When using the pump start and stop the valve before and after the water pressure difference as a control power, with the opening and closing of the pump automatically opens and closes the function. (2) Valve opening and closing movements can effectively prevent accidents caused by water hammer pressure wave. According to field use survey and measured, stop the pump water hammer pressure peak at 1.3 times the working pressure. (3) Without on-site commissioning, a wide range of applicable conditions. (4) basically no maintenance. As a valve to replace the three valves, maintenance and repair workload greatly reduced. (5) resistance loss is small. The use of streamlined, wide body design, resistance loss than the same kind of products abroad to reduce more than 50%, such as DN200 products in the v = 2m / s economic flow conditions, multi-functional pump control valve loss of 0.7m, while foreign similar products Is 1.5m. 2, a few technical issues 2.1 The design of the connection pipe micro-check valve role is to ensure that the valve opening time is greater than the motor start-up time, so that light motor start; the same time to avoid opening the valve speed caused by excessive water hammer. Valve opening time by the control valve according to field conditions pressure settings. The control valve can adjust the water flow speed of the upper and lower chambers of the diaphragm controller so as to adjust the slow closing time; the diaphragm controller can be repaired when the valve is closed; and the valve can be manually operated when the pump is in normal operation. The filter is to ensure the cleanliness of the water in the upper and lower chambers of the diaphragm controller. As the valve in a process of opening and closing the water is reciprocating access, itself has the role of backwash, it can also be used for poor medium conditions. 2.2 The elimination of water hammer valve characteristics From the principle of destructive water hammer we can see that there are two main factors to reduce the water hammer boost: (1) just before cutting off the water flow velocity v as small as possible (close to zero ) Close the main valve plate; (2) make the valve closing time t is water Hammer phase u = 2L / α (α - pressure wave transmission speed, m / s; L - pipe length, m) 5-10 times , It is possible to limit the actual water hammer pressure h within a safe range so as to eliminate damaging water hammer hazards. The opening degree of the main valve plate of the multi-purpose pump control valve is determined by the impact force of the water flow in the pipeline. The main valve plate opening degree is high when the flow rate is high: the valve plate opening degree is small when the flow rate is reduced: when the flow rate approaches zero, Board closed. The whole process is consistent with the elimination of the principle of water hammer close fast, so the elimination of water hammer works well. Multifunctional pump control valve slow closing valve plate closed, the diaphragm must be formed on the lower chamber pressure difference before it can be achieved, that is, the main valve plate is closed, the slow closing valve plate can only be closed, it is impossible to produce slow closure and Speed ​​closed synchronization phenomenon. 2.3 The valve resistance characteristics In order to reduce the water flow resistance, the design reduces the weight of the main valve plate, using a streamlined spacious body design. The Hunan Hydraulic Machinery Quality Supervision authorized station test, DN200 multi-function pump control valve resistance coefficient of about 3.8, while the same specifications of the pipe swing check valve resistance coefficient of 5.5. 2.4 Diaphragm design Diaphragm quality is a direct impact on valve performance and service life of the key components, after a variety of screening, selection of neoprene as raw materials, the middle nylon mesh to strengthen; by the Hunan rubber Monitoring authorized station testing, 650,000 fatigue fatigue without rupture, can be used for more than 10 years. 2.5 Maintenance No other external hydraulic or electric components, the basic maintenance-free, and the use of a wide bonnet, valve components can be removed completely, easy maintenance.
Alumina grinding balls mean in bauxite, roller powder, industrial alumina powder, high temperature calcined material such as alpha alumina powder as raw materials, ingredients, grinding, milling, slurry-making, mud), molding, drying and firing process is made and be become, such as main is widely used as grinding media ball stone.
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Commodity |
Alumina ball 60mm |
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Appearance |
Faint yellow |
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Al2O3 Content (%) |
≥70%±2% |
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Bulk Density |
3.02(g/cm3) |
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Water absorption |
<0.01(%) |
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Degree of hardness (MOhs) |
8 |
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Use raw material |
Fining high bauxite |
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Formation way |
Isostatic pressing |
Alumina Ball 60,99% High Alumina Ball,High Purity Alumina Balls,99% Purity High Alumina Grinding Ball
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