How to maintain and calibrate the dispensing valve of a vision dispensing machine?

the dispensing valve body is the execution core of quantitative dispensing for a vision dispensing machine, after long-term operation, seal wear, incomplete suck-back, and slow dispensing-volume drift will appear. Regular maintenance keeps wear and contamination within acceptable range; regular calibration pulls actual dispensing volume back to the set range; both are basic work to maintain dispensing consistency within the design range.

I. What to check in daily valve-body maintenance

Focus on checking theseal ring, piston, and nozzle for wear，whether the air circuit carries water or oil，whether residual adhesive is cleaned promptly. Abrasive adhesives accelerate internal valve-body wear and should be prioritized in the maintenance cycle; clean with compatible solvent before stopping the machine or changing adhesive to avoid residue curing and clogging.

II. Why the valve body needs calibration

The valve body's dispensing volume slowly drifts with temperature, adhesive viscosity, and its own wear; relying solely on factory parameters cannot guarantee consistency long-term. Calibration uses measured dispensing volume against the set value to correct deviation, making equipment-end parameters truly reflect on the glue dot.

III. How is calibration generally done

Commonly usedweighing methodmagazinevolumetric methodMeasure several actual dispensing volumes, take the average and compare with the set value, then adjust pressure, time, or metering parameters. Record the ambient temperature, adhesive batch, and valve-body status at the time, establish a calibration baseline, so subsequent drift has a reference.

IV. Notes on different valve bodies

suck-back valveFocus on whether the glue cutoff and suck-back volume are clean, to avoid stringing;Screw valveFocus on metering-screw wear and clearance to ensure stable gram-weight;jetting valveFocus on the pin-nozzle gap and valve-seat cleanliness to maintain non-contact dispensing consistency. Different valve-body types have different maintenance and calibration observation items.

V. How to coordinate with Bolli equipment

Bolli vision dispensing machine covers needle valve, suck-back valve, screw valve, jetting valve, etc. multiple valve bodies, providing unlimited remote after-sales and sample-testing support, can assist customers in establishing valve-body spot-check tables and calibration cycles, solidifying wear-part replacement, cleaning, and calibration actions into daily operation and maintenance.

VI. How to set the maintenance cycle

The cycle should be set by adhesive abrasiveness and output; strong abrasiveness and high output shorten the interval; consumables like seals and nozzles are replaced upon end-of-life, not after batch defects appear. Archive valve-body specifications, replacement records, and calibration data with the workpiece process card, convenient for traceability and quick source location during quality fluctuation.

VII. Summary

the maintenance and calibration of the dispensing valve body is the underlying action for a vision dispensing machine to maintain dispensing consistency within the design range; maintenance controls wear and calibration corrects deviation. If you need to establish a spot-check and calibration cycle combined with your adhesive and valve body, you can contactBolli Automation Co., Ltd. 13352947677, with engineering personnel assisting in sampling and training.