KDA 200/250-455 H

KDA——pump series code

200——Exit diameter (mm)

250——Inlet diameter (mm)

455——Nominal diameter of impeller (mm)

H——impeller type code

KDA type pump is a single-stage double-suction centrifugal process pump supported at both ends, with a radially split pump casing. It is especially suitable for transporting high temperature and high pressure as well as flammable, explosive or toxic liquids. The installation method is a horizontal centerline support to minimize the deformation and displacement caused by thermal expansion and contraction. The pump body is designed as a double vortex chamber to balance the radial force of the pump.

The pump can exhaust itself by relying on the flow of pressurized liquid, but there are navels on the upper and lower parts of the volute of the pump body. When the user needs to exhaust and drain, the Rc3/4 screw hole can be opened and screwed on with a plug before leaving the factory. .

The suction and discharge flanges of the pump are vertically upward and are integrally cast with the pump body. The flange size and pressure rating are equivalent to the American Standards Institute (ANSI) standard rating. Depending on the operating temperature and material category,

The maximum operating pressure of the flange can reach about 5MPa.For reliability, KDA-type processes all use cast steel shells, and their hydrostatic pressure test is 7MPa.

The shaft seal cavity and the pump body are cast into one body. It can be equipped with packing seals and balanced, bellows or string type mechanical seals. An optional water-cooling cavity jacket is cast outside the cavity. The water-cooling jacket must be specially equipped. It is required or used when the temperature of the conveying medium is water exceeding 66°C and the temperature of hydrocarbons exceeding 150°C. When the conveyed medium needs to be insulated, low-pressure steam or other insulating media can also be introduced into the jacket.

The hydrostatic pressure test 1MPa cooling water inlet connector Rc1/2 is below the pump cover, and the outlet connector Rc1/2 is above the pump cover.The steam inlet connector Rc1/2 is above the pump cover, and the outlet connector Rc1/2 is below the pump cover.

The impeller is integrally cast and is dynamically balanced along with the rotor. It is driven by a key to the shaft, and the rotor is supported at both ends. The shell sealing ring or the impeller sealing ring are both replaceable standard parts. The good matching between the two is ensured by the difference in materials and hardness.

The seals at both ends of the impeller are intentionally designed to have different sizes, that is, the sealing ring on one side of the thrust bearing is slightly smaller than the other side, causing the pump to exert a slight axial force and make the shaft always work under tension.Avoid the left and right movement of the rotor.

Both ends of the pump are bearing bodies of the same size. The materials are cast steel and cast iron. They are fastened to the bracket with bolts and positioned with matching seams.A set of radial bearings is installed on the coupling end, and two sets of back-to-back thrust bearings are installed on the other end.The bearings are lubricated by an oil slinger ring with a moderate amount of oil. Each bearing has an axial heat sink cast outside the body.It is available for air cooling (t≤120℃), fan cooling (t=120℃-260℃), and water cooling (t≥260℃). Fan cooling is especially suitable for areas with water shortage or poor water quality.

When the pump bearing is cooled by a fan, the fan will replace the dust disk. This is also the unique feature of this type of pump. When the pump bearing is cooled by water, a water-cooling jacket is cast on the outside of the ball bearing.

The bearing body is equipped with a visible circular oil mark and an oil cup to monitor and control the oil level. The bearing body is equipped with copper dust-proof disks at both ends, extending to the inner hole of the bearing gland.It can prevent dust or water from entering and prevent oil leakage. When the bearing should break, it can also play a supporting role.

For inspection and maintenance, the impeller, bearings, shaft seals, etc. can be easily removed without disassembling the suction or discharge pipelines. The KDA process pump uses a flexible diaphragm to extend the coupling component, and it matches the pump shaft in a tapered shape, making it very easy to disassemble and assemble.

The rotation direction is counterclockwise when viewed from the prime mover toward the pump.