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均质机预防性维护计划——检查项目及时间安排

Why Preventive Maintenance Matters for Homogenisers

A well-maintained homogeniser delivers consistent product quality, operates efficiently, and avoids costly unplanned downtime. High-pressure homogenisers are precision machines — the combination of extreme pressures (200–600+ bar), reciprocating components, and product-contact surfaces means that even minor neglect can escalate quickly into major failures.

This preventive maintenance schedule provides a structured framework covering daily, weekly, monthly, and annual checks. While specific intervals may vary depending on your machine model, operating conditions, and product type, this guide serves as a comprehensive baseline that can be adapted to your operation.

Daily Checks

Daily inspections should be performed at the start or end of each production shift. These are quick, visual and auditory checks that take no more than 10–15 minutes:

Visual Leak Inspection

Walk around the machine and check for any signs of product leakage at the cylinder block connections, valve assembly, and packing area. Also check for oil leaks from the crankcase, 驱动组件, and hydraulic system. Any new leak — however small — should be documented and investigated before the next production run.

Operating Pressure Verification

Record the operating pressure at the start of each shift. A gradual decline in pressure over days or weeks is often the first indicator of valve wear, packing degradation, or cylinder block issues. Compare readings against your baseline and investigate any deviation greater than 5% from the set point.

Noise and Vibration Assessment

Listen for unusual sounds — knocking, grinding, or high-pitched whining can indicate bearing wear, loose components, or cavitation. Experienced operators can often detect problems by sound before they become visible. If vibration levels seem elevated, investigate the bearings, drive alignment, and mounting points.

Oil Level Check

Check the crankcase oil level via the sight glass or dipstick. The oil should be within the marked range, clear (not milky or discoloured), and free of metal particles. A milky appearance indicates water contamination — often from a failed seal. A dark or burnt smell suggests overheating. Check 机油滤清器 for excessive contamination.

CIP System Verification

After each CIP cycle, verify that all cleaning solution has been flushed from the system. Check that drain valves are functioning correctly and that the homogenising valve assembly has returned to its operating configuration.

Weekly Checks

Weekly maintenance adds a layer of more thorough inspection beyond the daily routine:

Packing Condition Assessment

Inspect the plunger packing area for signs of excessive leakage or product residue build-up. While minor seepage at the packing gland is normal on some designs (it provides lubrication to the plunger), any significant increase in leakage rate compared to the previous week warrants closer inspection. Have replacement seals and packings in stock to avoid delays when replacement is needed.

Drive Belt Tension and Condition

For belt-driven homogenisers, check the tension and condition of all drive belts. Look for cracking, fraying, glazing, or uneven wear. Belt tension should be checked against the manufacturer’s specification using a tension gauge. Over-tensioned belts accelerate bearing wear; under-tensioned belts slip, generate heat, and wear prematurely.

Pressure Gauge Calibration Verification

Compare your operating pressure gauges against a reference gauge or the machine’s digital readout. Pressure gauges can drift over time, leading to inaccurate readings that mask developing problems. Replace any gauge that reads more than 2% outside its calibrated range.

Safety Valve Function Test

Verify that the safety relief valve is not seized and appears to be in working condition. The safety valve is your last line of defence against catastrophic over-pressure — it must always be functional. Full function testing (actuation at set pressure) should be performed per the manufacturer’s recommended schedule.

Monthly Checks

Monthly maintenance involves more detailed inspection and some component assessment:

Valve Inspection

Remove and inspect the 均质阀总成 — both first and second stage if applicable. Check the valve seat and valve (impact ring) surfaces for scoring, erosion, and pitting. The contact surfaces should be smooth and even. Minor marks can sometimes be lapped out; significant damage requires replacement. Keep spare valve sets in stock. Read more about valve materials (Stellite, Tungsten Carbide, Ceramic, Diamond Coating) to understand wear patterns for different product applications.

Plunger Surface Inspection

Remove the 活塞 and inspect the surface for scoring, corrosion, or chrome flaking (on chrome-plated plungers). A damaged plunger surface will destroy new packing rapidly and can also score the cylinder block bore. Replace any plunger that shows surface defects beyond light polishing marks.

Oil Analysis

Take an oil sample from the crankcase and either analyse it in-house or send it to a laboratory. Oil analysis can detect early signs of bearing wear (metal particles), water contamination, excessive acidity (indicating oil degradation), and incorrect oil grade. Replace the oil and 机油滤清器 if the analysis indicates degradation or contamination, or at the intervals specified by the manufacturer.

Packing Replacement Assessment

Evaluate whether the plunger packings need replacement. The typical replacement interval for plunger packings ranges from 500 to 2,000 operating hours, depending on the product being processed, operating pressure, plunger speed, and packing material. High-pressure applications, abrasive products, and elevated temperatures all reduce packing life. When replacing packings, always replace the complete packing set — mixing old and new components leads to uneven wear and premature failure. Source the correct seal kits for your specific machine model.

Bearing Lubrication

Grease all bearing lubrication points according to the manufacturer’s grease chart. Use the specified grease type and quantity — over-greasing is as harmful as under-greasing, as it can cause overheating and premature bearing failure. Check bearing temperatures (by hand or with an infrared thermometer) after lubrication. A bearing that runs noticeably hotter than its neighbours may be failing.

Annual Checks (Major Service)

The annual service is a comprehensive overhaul that should be planned during a scheduled production shutdown:

Cylinder Block Bore Inspection

Perform a thorough internal inspection of the 气缸体 (compression block / pump block) bores using a bore scope or by visual inspection with adequate lighting. Measure the bore diameters at multiple points and compare against the manufacturer’s specifications. Check for scoring, corrosion, and ovality. For detailed guidance, see our 气缸体维护指南.

Crankshaft and Connecting Rod Inspection

Inspect the crankshaft bearings, connecting rod bearings, and crosshead guides for wear. Check for play in the connecting rod big-end and small-end bushings. Excessive play leads to plunger misalignment, which accelerates packing and bore wear. Replace bearings and bushings as required.

Complete Seal and Packing Replacement

During the annual service, replace all 海豹, packings, O-rings, and gaskets — even those that appear to be in good condition. Elastomeric components degrade over time regardless of visible wear. This includes drive shaft seals (BOS, 高林, APV), oil seals, baffle seals, and actuator packings.

Motor and Electrical Inspection

Check the main drive motor for insulation resistance, bearing condition, and cooling fan operation. Inspect all electrical connections, contactors, and overload settings. Verify that all safety interlocks and emergency stops function correctly.

Hydraulic System Service

For machines with hydraulic homogenising valve actuation, service the hydraulic system: replace hydraulic oil, clean or replace filters, check hydraulic hoses for cracking or swelling, and verify actuator function and response time. Browse hydraulic system components available from stock.

Alignment and Vibration Analysis

Check the alignment between the motor and the homogeniser drive shaft using laser alignment equipment. Misalignment is one of the leading causes of premature bearing and seal failure. Consider performing a vibration analysis to establish a baseline for future monitoring.

Spare Parts: Keep Critical Items in Stock

Unplanned downtime is costly. Maintain a stock of critical spare parts based on your machine’s model and typical wear patterns. At minimum, keep the following on hand:

BOS Homogenisers maintains over 15,000 spare parts in stock for BOS, Gaulin, APV, SPX, and Rannie homogenisers, ensuring fast delivery when you need it. Browse the full 备件目录 或 parts by category.

Download and Customise This Schedule

Every homogeniser installation is unique. Use this schedule as a starting point, then adjust intervals based on your operating hours, product type, environmental conditions, and the manufacturer’s specific recommendations for your machine model.

Need help developing a customised maintenance programme for your homogeniser? Our service engineers can assess your installation, recommend optimal maintenance intervals, and supply all the parts you need to keep your machine running at peak performance.

联系 BOS 均质机 for maintenance support, spare parts, or to schedule a service visit.

Disclaimer: This maintenance schedule is provided as general guidance and does not replace the original equipment manufacturer’s maintenance manual. Maintenance intervals should be adjusted based on actual operating conditions, product type, and the specific machine model. Always follow your organisation’s safety procedures and lockout/tagout protocols when performing maintenance on high-pressure equipment.

Applicable to All BOS Homogenizers

This maintenance schedule applies to the full BOS MG-series range. Find the right machine for your operation:

查看所有 BOS 均质机 → | Laboratory & Pilot models | H-Range (next generation)

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