SK liquid ring vacuum pump
SK series water/liquid ring vacuum pumps are widely used in petrochemical, pharmaceutical, food, sugar industry and other fields. Because the gas compression process is isothermal during the working process, it is not easy to compress and pump flammable and explosive gases. It is dangerous and its application is more extensive.
■Flow rate: Q=15～240（m³/h）
■Total head: H=1.8～80 (m)
■Since the work generates heat during work, the working water ring will heat up, and at the same time, part of the water and gas are discharged together. Therefore, during the work, the pump must be continuously supplied with water to cool and replenish the pump.
■The seal can be mechanically sealed and installed in the packing chamber, and the packing is omitted. The packing gland is replaced by a mechanical gland, and the rest of the structure is the same as the packing seal.
■A disc is mounted on the end cap. The disc is provided with suction, exhaust and rubber ball valves.
|Anti-corrosion alloy||Cast steel||Stainless steel|
|China standard||ASTM standard|
Carbon steel SS420 2205 SS304 SS316
|Item||Factory standard||Optional configurations|
|Motor||Reputed China brands||ABB, Siemens, Nanyany, Jiamusi or designated brands|
|Bearing||Reputed China brand||SKF, NSF, FAG or designated brands|
|Flanges&counter flanges||China standard||European std, German std, American std, Japanese std|
|Couplings||Pin type||Flexible diaphragm coupling|
■SK series water ring vacuum pumps are widely used in petrochemical, pharmaceutical, food, sugar industry and other fields. Because the gas compression process is isothermal during the working process, it is not easy to compress and pump flammable and explosive gases. It is dangerous and its application is more extensive.
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Vacuum systems consist of vacuum pumps and tanks mounted on a skid or truck. The vacuum pump creates a vacuum in the tank and the oil moves directly through a hose or pipe to the tank from the skimmer or the source of the oil. The oil does not go through the pump, but moves directly from its source into the tank. Vacuum systems can handle debris, viscous oils, and the intake of air or water. The vacuum tank requires emptying, however, which is usually done by opening the entire end of the tank and letting the material move out by gravity.
Classification of vacuum pumps
Vacuum pumps are categorized as gas transfer pumps and gas binding or capture pumps.
While gas-displacement vacuum pumps can be used without limitation, gas-binding vacuum pumps have a limited gas absorption capacity and must be regenerated at certain process-dependent intervals.
Gas-displacement pumps, which are also referred to as gas transfer pumps, are classified either as positive displacement pumps or kinetic vacuum pumps.
Positive displacement pumps displace gas from sealed areas to the atmosphere or to a downstream pump stage. Kinetic pumps displace gas by accelerating it in the pumping direction, either via a mechanical drive system or through a directed vapor stream that is condensed at the end of the pumping section.
Gas-binding vacuum pumps either bind the gas to an especially active substrate through gettering or condense the gas at a suitable temperature. Chemisorption is performed technically by a pump type known as getter pumps which constantly generate pure getter surfaces through vaporization and/or sublimation or sputtering.
If the gas particles to be bound are ionized in an ion getter pump before interacting with a getter surface, they can at the same time clean the getter surface by sputtering and be buried by sputtered material.
Anyone without a deep understanding or knowledge of pumps might think that vacuum generation is simply a question of “plugging in a pump”, starting it up and waiting for the vacuum to drop to the required level.
But the reality is that there is far more to the process.
Vacuum pumps are used to remove air or gas molecules from a sealed volume thus creating a vacuum. The vacuum level can be controlled, for example, with a process gas at a specific pressure.
Finding the right vacuum pump not only requires a good understanding of the necessary vacuum level and application – it also requires an understanding of process conditions, the operating range and the benefits and limitations of each specific vacuum pump type.
The pump selection heavily depends on the level of vacuum that needs to be obtained. Typically, the different pressure ranges in vacuum technology are defined as follows:
Rough vacuum (from 10 3 mbar to 1 mbar)
Medium vacuum (1 mbar to 10 -3 mbar)
High vacuum (10 -3 mbar to 10 -7 mbar)
Ultra-high vacuum (10 -7 mbar to 10 -12 mbar)
Extreme high vacuum (less than 10 -12 mbar)
In rough- and medium vacuum most gas molecules are within the volume of the vacuum chamber, whereas in ultra-high vacuum (UHV) and extreme high vacuum (XHV) most of the remaining molecules will be on or in the chamber walls respectively. Thus, different pump technologies will be required for the different vacuum pressure ranges.
It is also important to consider whether it is mainly about pumping down to the required pressure level or – for example – holding a specific pressure level while certain gas loads are introduced to the vacuum system (e.g. for process reasons). While some vacuum pumps are optimized for pump-down processes (but might struggle with high process gas loads), others are more capable of handling high gas loads.
2.IMPACT OF THE PROCESS ON THE PUMP
Dependent upon the application area and medium to be pumped, the choice of pump(s) will vary. For example, rotary vane (RV) pumps are suited for a wide range of low and medium vacuum applications, including research and development, analytical instruments, industrial and coating activities, freeze drying, process engineering and many more.