Balance Sleeve DG600-240-04-20: The Key to Feed Pump Gap Balance

I. The Gap Guardian in the Feedwater Pump

In big thermal power plants, the DG600-240 type feedwater pump is the main workhorse for high-pressure boiler feed water. Is this machine running steady? Axial force balance is the biggest factor. The Balance Sleeve DG600-240-04-20 guards this balance. It's the core static seal part. It stops the thrust bearing from burning out due to too much load.

Dongfang SRI supplies parts to power stations for years. We see so many failures because the sleeve was put in wrong. Based on our repair knowledge, every small install detail for this simple-looking part affects the pump's safe running.

Installation Gap: Safety Margin in Millimeters

• The DG600-240-04-20 sleeve sits in a weird spot. It's not on the spinning rotor. It's pressed precisely into a static bore in the inner pump casing. The high-speed balance drum spins inside it. They make a tiny dynamic gap pair. The size of this gap decides if the machine lives or dies.
• The new sleeve must have a strict single-side radial clearance: 0.41 to 0.49 millimeters. This number isn't random.
• Too small a gap? It rubs when running, gets super hot. Worst case, it "seizes the shaft," stopping the pump instantly.
• If the wear limit goes past 0.675 millimeters, high-pressure water backflow suddenly jumps up.
• More backflow kills the axial force balance. Thrust pad temperatures keep rising. Pump shaking gets bad. One plant had a sleeve worn past the limit. They didn't change it fast enough. It burned out the thrust pads and shut down the unit. Big money lost.

II. Quality Support: Material and Precision Control

Dongfang SRI's DG600-240-04-20 sleeves use two layers for safety. Stainless steel base for strong structure. A special wear- and corrosion-resistant alloy lining for long life. The inner diameter is held strictly to the tolerance band. It meets the assembly gap requirement right out of the factory. No need for extra machining on site.

The surface finish hits a standard of Ra0.4μm or better. This makes the sleeve and drum much less likely to wear during the initial break-in period. Feedback from plants is simple: thrust pad temperature dropped a lot, rotor axial movement stayed steady. The pump runs continuously for 30% longer than before.

III. Full Matching Kit, Easier Maintenance

Pump maintenance rarely uses just one part. When you swap the sleeve, you usually need to check seals and lock rings too. Dongfang SRI offers the full set of critical spares for the DG600-240 pump. All parts match perfectly. No problems from mixed-spec parts.

From the main sleeve to all the seals, Dongfang SRI follows the original equipment standard for strict quality. Choosing matched spares means fewer pump failures. It also means longer run times between repairs. It builds a solid base for the power plant running steady.

HKCYT-2025-11-25