1. Equipment Purpose
The automatic flow and pressure testing equipment for gas nozzles is an automated testing system specifically designed for the testing of flow characteristics and pressure performance of various gas nozzles, pressure regulators, and gas appliance gas passage components. The nozzle is one of the core components of a gas burner; its flow characteristics and pressure output directly determine the burner's thermal load, combustion stability, and overall energy efficiency. This equipment can comprehensively evaluate the flow output, pore size consistency, pressure-flow relationship curve, and sealing performance of gas nozzles under different supply pressures. It is widely used in product fields such as gas water heaters, gas stoves, gas wall-hung boilers, and gas engines, covering in-factory inspection of nozzles, online testing of production lines, laboratory R&D verification, and after-sales fault analysis.
Unlike traditional manual drainage methods or visual comparison measurements, this type of equipment uses automated testing methods, offering high accuracy and repeatability. Test results are not affected by manual reading errors, measurement data can be stored and traced, greatly improving inspection efficiency and quality control levels. Test results can be directly used to group nozzles according to flow characteristics to ensure combustion uniformity and meet energy efficiency standards during overall operation.
2. Core Testing Items
Automatic gas nozzle flow and pressure testing equipment typically covers the following core detection modules:
| Detection categories | Testing items | Key parameters/requirements |
|---|
| Flow characteristics | Nozzle output flow rate (instantaneous/cumulative) | Measure the actual output flow of the nozzle at the set pressure and determine the deviation from the nominal value |
| Flow-pressure characteristic curve | Flow variation curves under different supply pressures are plotted, and the linear response characteristics of the nozzles are evaluated |
| Flow stability | Monitor flow fluctuation amplitude within a specified time to assess the stability of nozzle flow characteristics |
| Pressure performance | Nozzle pre-pressure | Accurately measure whether the air supply pressure at the nozzle front meets the design requirements |
| Pressure regulating valve outlet pressure | Testing the pressure regulating valve's pressure regulation output characteristics under different input pressure conditions |
| Pressure decay/holding pressure test | After sealing the tested channel, pressure changes over time are monitored to assess the system's sealing |
| Pore size consistency | Nozzle aperture measurement | The consistency deviation of nozzle aperture diameter is indirectly evaluated through the flow equality method |
| Multi-channel consistency comparison | Multiple stations simultaneously test multiple nozzles, compare flow deviations, and identify nonconforming products |
| Airtightness/leak detection | Positive pressure leakage amount | Gas at the specified pressure is filled into the cavity of the piece under test, and the amount of leakage per unit time is measured to determine whether the seal is compliant |
| Negative pressure leakage amount | Uses the negative pressure method for measurement, suitable for sealing inspection of thin-walled nozzles or easily deformed workpieces |
| Dynamic Performance (Specifically for Solenoid Nozzle Type) | Pulse width—flow characteristics | Test the nozzle jet flow under different energized pulse widths to evaluate the dynamic response of the solenoid valve nozzle |
| Drive voltage adaptation characteristics | Flow output stability testing under different driving voltage conditions |
| Durability | Repeatability testing | Cyclic testing of flow consistency and attenuation trends of the nozzle under multiple switching actions |
3. Equipment Composition and Working Principle
The gas nozzle automatic flow and pressure testing equipment typically consists of the following functional modules:
| Module categories | Main equipment/instruments | Function description |
|---|
| Air source and pressure stabilization system | Compressed air/nitrogen sources, precision pressure reducing valves, pressure stabilizing tanks | Provides a stable and clean air source, with multi-stage precision pressure reduction and stabilization to ensure air supply pressure fluctuations <± 0.02MPa, preventing pressure instability caused by intermittent supply that affects test accuracy |
| Flow measurement unit | High-precision flow meters (mass flow meters / thermal flow sensors) | It measures the actual flow rate passing through the nozzle being measured, with selectable ranges. Measurement methods include instantaneous flow detection and cumulative flow metering |
| Pressure measurement unit | High-precision pressure transmitter (pressure range optional) | Real-time monitoring of nozzle pre-pressure and pressure regulator outlet pressure in the test pipeline |
| Electrical control system | PLC programmable controllers, touchscreen industrial all-in-one machines | Achieves full-process automatic control, including valve opening and closing, inflation/detection/exhaust timing control, data acquisition and processing |
| Fixture and fixture system | Pneumatic fixtures, quick interface adapters | Quickly clamping gas nozzles of different specifications to achieve airtight connection between the test piece and the test pipeline |
| Temperature compensation and calibration | Temperature sensors, temperature and pressure compensation algorithms | After testing, temperature and pressure compensation correction are automatically applied to the measurement results, eliminating interference from ambient temperature changes on flow measurement values and ensuring the accuracy of test results |
| Data processing and storage | Industrial control computers, test management software | Automatically collects flow and pressure detection data, plots pressure-flow curves in real time, stores test records, supports report printing and integration with MES systems; Multiple sets of different test parameters can be stored simultaneously, allowing only switching channels when testing different products |
Working principle: The equipment supplies dry and clean air to the nozzle under test at a certain pressure. Through a precision pressure-reducing valve and pressure stabilizing tank, the supply air pressure is stabilized at the set value. The actual airflow through the nozzle is measured by a high-precision flow meter, and the pressure transmitter monitors the test pipeline pressure in real time. After temperature and pressure compensation correction, the measurement results are compared with the preset qualification criteria. The system automatically outputs pass/fail judgment results. The entire testing process is completed automatically by the PLC and touchscreen control system, and test parameters can be preset and stored according to different product specifications.
4. Technical Indicator Reference
Based on the parameters of typical gas nozzle flow and pressure automatic testing equipment, the main technical specifications are as follows:
| Testing parameters | Typical technical indicators |
|---|
| Flow measurement range | 0.20~20L/min (expandable) |
| Flow resolution | 0.01L/min |
| Flow measurement accuracy | ±0.5%~±1.5%FS |
| Test the pressure range | 3~100kPa (expandable) |
| Pressure resolution | 0.1kPa |
| Pressure measurement accuracy | ±0.25%~±0.5%FS |
| Leak measurement resolution | 0.001 mL/min |
| Inflation/detection time settings | Adjustable from 0~999 seconds |
| Air source requirements | Pressure≥ The test pressure for the test piece is +0.1MPa, providing dry and clean compressed air |
| Power supply | AC 220V ±10% 50Hz |
| Operating temperature range | 0~40℃ |
| Operating humidity range | 20~85% RH (non-condensing) |
| Number of channels/stations | Single-channel or multi-channel options available |
5. Applicable Standards
The design and testing of automatic gas nozzle flow and pressure testing equipment are mainly based on the following standards:
| Standard number | Standard name | Scope of application |
|---|
| GB/T 34166-2017 | "Measuring Natural Gas Flow Using a Standard Nozzle Flow Meter" | Basic standards for nozzle flow measurement methods |
| GB/T 2624.3-2006 | "Measuring Full Pipe Fluid Flow Using Differential Pressure Devices Installed in Circular Cross-Section Pipes Part 3: Nozzles and Venturi Nozzles" | Technical requirements for nozzle flow measurement and differential pressure devices |
| GB/T 16411-2023 | "General Test Methods for Household Gas Burners" | General test method for gas nozzles used in gas burners |
| QC/T 809-2009 | "Car Gas Nozzles" | Technical requirements and test methods for automotive gas nozzles, suitable for automotive gas nozzles using CNG/LPG as the medium |
| GB/T 21188-2007 | "Measuring Gas Flow Using Critical Flow Venturi Nozzles" | Technical specifications for measuring gas flow using the sonic nozzle method |
| GB 16410-2020 | "Household Gas Stoves" | Technical requirements for nozzles matching gas stoves |
| GB 6932-2015 | "Household Gas Rapid Water Heater" | Reference Standards for Compatible Nozzles of Gas Water Heaters |
| ISO 9300:2005 | "Measurement of gas flow by means of critical flow Venturi nozzles" | The internationally recognized Critical Flow Venturi nozzle flow measurement standard is the core design basis for sonic nozzle flow testing devices |
Frequently Asked Questions
What industries is your company's testing equipment mainly suitable for?
We specialize in non-standard testing equipment for gas appliances and household appliances, especially in the gas appliance industry, with nearly thirty years of technical accumulation in the gas appliance industry, including gas water heaters, wall-hung boilers, and gas stoves. At the same time, the equipment is widely used in kitchen appliances such as range hoods, electric ovens, and sterilizers, as well as in environmental reliability testing fields like salt spray tests and high and low temperature tests. In addition, industrial automation inspection solutions can be customized according to customer requirements.
Do you make standard equipment or non-standard customization?
Focusing mainly on non-standard customs. Each production line and every product category has unique testing requirements. We provide a full range of customized services from solution design, mechanical manufacturing, electrical control, to software integration based on your inspection targets (such as valve bodies, complete machines), inspection items (performance, aging, lifespan), production line cycles, and environmental conditions. There are already numerous successful non-standard cases in the gas appliance and home appliance industries for reference.
How is the precision and stability of the equipment? How to verify it?
Before leaving the factory, we conduct complete machine testing and precision calibration according to national or industry specifications, and can provide actual measurement data reports. Common verification methods include: repeated testing with standard samples, comparison with customers' existing qualified equipment, or testing by third-party metrology agencies. For key parameters such as gas flow, pressure, and temperature, we also provide calibration recommendations and cycle reminders. For projects requiring extremely high precision, free sample testing can be arranged.
How long does it take to customize a device? Will it affect my production?
The project duration depends on the complexity of the equipment, generally 4~8 weeks, and includes requirements confirmation, solution design, manufacturing, factory pre-commissioning, and on-site installation. We complete pre-assembly and functional testing of the entire machine in the factory, and only a short time of wiring and fine-tuning can be done on site for trial operation. We will communicate with you in advance about the production shutdown window and develop a detailed installation schedule to minimize the impact on production.
Is the equipment complex to operate? What training do you offer?
The equipment uses a touchscreen human-machine interface, with simple operation logic; ordinary workers can use it daily after half a day of training. We offer tiered training: operator training (power on/off, data retrieval, fixture change), technician training (parameter adjustment, simple fault handling), and engineer training (system configuration, deep maintenance). It also provides a library of operation videos and illustrated manuals for easy access at any time.
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