Drive End Sleeve HZB253-640-01-04: Technical Dissection of Core Wear Part for HZB253-640 Booster Pump

I. Product Overview: Positioning as the Core Support at the Booster Pump Drive End

The Drive End Sleeve, number HZB253-640-01-04, is a dedicated spare part developed specifically for the HZB253-640 booster pump. It mounts onto the pump unit's drive end shaft assembly and undertakes three key core functions:

1. Firstly, to provide radial positioning and guidance for the main shaft, ensuring the coaxiality of the shaft system during running.
2. Secondly, to collaborate with the mechanical seal, constructing a barrier for media sealing.
3. Thirdly, acting as a wear part to absorb friction loss between the main shaft and the casing, reducing the risk of direct main shaft wear.

As a specialized spare parts supplier, we rigorously follow the original design standards of the booster pump. The processing precision, material performance, and assembly adaptability of the HZB253-640-01-04 Drive End Sleeve are included in our full-process quality control. This guarantees the component completely matches the original machine in dimensions and performance, meeting the power plant's "ready-to-install, ready-to-use" requirement during overhaul.

II. Technical Characteristics and Advantages: Reliability Assurance Driven by Dual Factors (Material and Process)

1. 1Cr13 Martensitic Stainless Steel: Optimum Balance of Wear Resistance and Toughness

The HZB253-640-01-04 Drive End Sleeve utilizes 1Cr13 Martensitic Stainless Steel (conforming to the GB/T 1220-2007 standard). This material differs from common austenitic stainless steel and possesses performance advantages more suitable for drive end working conditions:

• High Hardness for Anti-Wear: After tempering treatment, hardness reaches HBW 159-217. This effectively resists friction loss during high-speed operation of the main shaft. Component life is extended by more than 30% compared to conventional materials, reducing power plant maintenance frequency.
• Strong Mechanical Properties: Tensile strength ≥540MPa, yield strength ≥345MPa. Able to withstand impact loads during torque transmission at the drive end, preventing plastic deformation caused by overload over long-term operation.
• Moderate Toughness: Elongation ≥18%. This ensures no brittle fracture due to stress concentration during assembly (e.g., thermal fitting, press fitting), lowering the risk of installation failures.

2. Precision Machining: Strict Control of Coaxiality and Dimensional Consistency

The core competitiveness of the Drive End Sleeve HZB253-640-01-04 resides in its precision machining process:

• Coaxiality Guarantee: The coaxiality error between the inner bore and the outer circle is <0.01mm. This ensures that after assembly with the main shaft, the shaft system's radial runout is controlled within 0.02mm, avoiding vibration noise and sealing leakage caused by eccentricity.
• Dimensional Consistency Management: Assembly dimensions are strictly controlled "from the shaft's drive end to the outer face of the locknut." The deviation from the dimension measured before disassembly is <0.25mm. This precisely guarantees impeller centering, preventing hydraulic imbalance and efficiency drop problems triggered by impeller offset.
• Surface Quality Optimization: The inner bore surface roughness $Ra <0.8μm, which reduces friction resistance between the main shaft and the sleeve. The outer circle surface undergoes passivation treatment, improving anti-corrosion capability in the boiler feed water environment.

III. Application Scenarios: Focus on Core Working Conditions of Power Station Booster Pumps

The design of the Drive End Sleeve HZB253-640-01-04 is totally matched to the operational characteristics of the HZB253-640 booster pump. It is mainly used in the following scenarios:

• Thermal Power Station Boiler Feed Water System: Adaptable to the booster pump's working condition of conveying clean water or boiler feed water (pH7-9, temperature ≤120℃. The 1Cr13 material's corrosion resistance meets the long-term use requirements in this environment.
• Power Plant Overhaul Replacement: When the original sleeve exhibits inner bore wear exceeding 0.2mm, surface cracks, or damage to the seal mating surface, it serves as a core spare part for direct replacement, quickly restoring pump unit operation.
• Preventive Maintenance: During annual or quarterly overhauls at the power station, it is pre-stocked as a critical wear part, avoiding downtime losses caused by sudden sleeve failures.

As a supplier specializing in power station equipment spare parts, we provide full-cycle technical support for the Drive End Sleeve HZB253-640-01-04 to our customers. This includes installation guidance and interpretation of wear detection standards, assisting power plants to enhance equipment operation and maintenance efficiency.