Quality Control

For vacuum pumps, quality is not determined by appearance alone. Component dimensions, internal clearances, sealing, assembly accuracy, lubrication, and operating conditions directly affect vacuum performance.
Our quality control system covers every critical manufacturing stage--from incoming raw component inspection (IQC) and precision machining (IPQC), to functional assembly, vacuum performance testing, and final outgoing inspection (OQC).

Vacuum Performance Testing

A vacuum pump may look flawlessly built while concealing hidden internal issues--such as micro-leaks, improper rotor clearances, oil circulation blockages, or subtle misalignments. For this reason, rigorous performance testing forms the core of our quality verification.
Depending on the pump type and technical specification, factory testing includes:

01/

Ultimate Pressure / Base Vacuum: Verified with calibrated capacitive/Pirani gauges.

02/

Pumping Speed: Tested in accordance with ISO 21360-1 standard procedures.

03/

Motor Operating Parameters: Current draw, power consumption, and winding temperature rise.

04/

Running Stability: Thermal equilibrium and mechanical smoothness checks.

05/

Vibration Analysis & Noise Level: Measured in dB(A) and FFT vibration spectrum.

06/

Oil System Integrity: Oil circulation, anti-suckback valve sealing, and gas ballast functionality.

Component and Dimensional Inspection

Vacuum pump performance depends heavily on the machining precision and metallurgical condition of individual parts. Incoming components are inspected before release into the assembly line.

Inspection Area	Critical Parameters Checked
Incoming Components	Geometric tolerances (concentricity, runout, perpendicularity), surface roughness ($Ra$), flange specs (ISO-K, KF, NPT, BSP), shaft hardness, dynamic seal material specs, and motor efficiency (IE3/IE4, IP55/IP65).
Housings / Cylinders	Inner diameter roundness, surface finish, and port positioning.
Rotors & Shafts	Dynamic balancing, concentricity, and axial play.
Bearing Seats & Seals	Precision tolerance fits and scratch-free sealing surface integrity.

Quality Control Focus by Vacuum Pump Type

Vacuum Pump Type	Primary Quality Control Focus	Critical Verification Parameters
Single-Stage Rotary Vane Pump	Rotor/vane assembly fit, chamber honing surface finish, oil distribution system, shaft seal integrity.	Ultimate pressure, anti-suckback valve seating, oil mist separation efficiency, vane movement smoothness.
Two-Stage Rotary Vane Pump	Inter-stage compression sealing, high-vacuum stage tolerances, oil circulation under deep vacuum.	Deep ultimate pressure (down to 10^-2 mbar range), running temperature stability, thermal expansion performance.
Roots Vacuum Pump (Booster)	CNC rotor profile accuracy, inter-rotor and rotor-to-housing clearances, timing gear backlash setting.	Zero-contact rotor movement, FFT vibration analysis, overflow/bypass valve response speed.
Custom Vacuum Systems	System integration, pipework leak tightness, automated control logic, backing pump compatibility.	Complete system ultimate vacuum, pumping speed curves, protection interlock execution.

Measurement, Equipment, and Quality Evidence

We believe quality assertions should be backed by transparent manufacturing data. The following documentation is available for export and contract verification:

Material & Machining

Material Test Certificates (MTC) and CMM Dimensional Inspection Reports.

Rotors & Mechanics

Dynamic Balancing Reports and Timing Gear Backlash Records.

Performance Logs

Factory Vacuum Performance Curves (Pumping Speed vs. Pressure) and Full Run-in Test Logs.

Compliance & Media

Certificate of Compliance (CE, ISO 9001) and photo/video evidence of testing setups.

Final Outgoing Inspection (OQC) Checklist

Inspection Item	Verification Standard
Model & Serial Number	Matched against order documentation and laser-engraved nameplate.
Electrical Specs	Verified voltage, frequency (50 Hz / 60 Hz), phase, and motor certification (CE / UL / ATEX).
Connections & Ports	Flange size, thread type, gas ballast, drain valve, and inlet filter configurations.
Assembly & Coating	Paint surface condition, oil level, seal integrity, and accessory inclusions.
Packaging	Export-standard ISPM-15 wooden case or heavy-duty palleted packaging.

Application-Driven Selection Parameters

Operational Parameter	Options / Details to Confirm
Target Pressure & Speed	Required operating vacuum level (mbar/Pa) and pumping speed (m^3/h or L/s).
Process Medium	Clean air, humid gas/water vapor, inert gas, or corrosive/dust-laden vapors.
Electrical Grid	Power supply specs (e.g., 220V/380V/415V/460V at 50Hz or 60Hz) and explosion-proof requirements.
Duty Cycle & Environment	Continuous 24/7 industrial operation vs. intermittent duty; ambient operating temperature.
Lubrication Needs	Standard mineral oil, synthetic PFPE oil, or food-grade lubricant.