Gas Burner Power Swinging and the Proportional Valve Hunting at Low Fire? NL-GPV-6 Leak and Flow-Characteristics Bench (pump performance test)

“The flame keeps swinging” and “the shower runs hot and cold” fill the service logs of every gas-appliance maker, and the trail usually ends at the proportional valve. A burr on the sealing face makes the valve hunt at low fire; a non-linear flow curve defeats any constant-temperature algorithm; a weeping seal makes next-morning ignition sluggish. The valve has to hold three things at once — airtightness, flow-linearity and modulation stability — yet a production line that only verifies “gas flows” captures none of them: no per-unit leak record, one flow curve from a sampled valve, and the micro-flow low-fire region entirely in the dark. By the time the fault shows in a finished appliance, valve, hob and boiler makers are arguing with no data on the table.

What the NL-GPV-6 gas valve bench measures

• Six stations, airtightness at 0.6-30 kPa in multiple steps, leak rate judged per unit in mL/h (the valve-flow branch of our pump performance test systems)
• Flow-characteristic sweep: twenty-point flow-versus-opening curve per valve, linearity and hysteresis auto-judged, out-of-band points flagged
• Modulation stability: outlet pressure ripple logged through a step command, quantifying the “hunting” complaint
• Low-fire duty: micro-flow stability and flame-out boundary verified unit by unit, closing the small-flow blind spot
• Cycle life: leak and flow curves re-measured after tens of thousands of open-close actions, sealing-face wear made visible
• Thermal re-test: actuation parameters re-checked after −10°C to 60°C exposure, seasonal difference exposed early
• Barcode and batch binding, leak, flow and stability data exported per unit, matching the appliance maker’s report format

Applicable standards

GB 16410 (domestic gas cooking appliances), GB 6932 (gas-fired instantaneous water heaters), GB 25034 (gas-fired heating boilers) and GB/T 2828 sampling; airtightness class and flow criteria can follow the customer’s standard and the valve specification.

Stations and throughput

Six stations running continuously replace “gas flows, pass it” with per-unit leak rates, twenty-point flow curves and step-response records in one pass — so incoming valves, appliance matching and end-of-line sampling share one bench, keeping flame-swing and flame-out complaints out of the field.

Manufacturer

Guangdong Endurance Electronic Equipment Co., Ltd. — a non-standard testing equipment manufacturer of gas proportional valve leak and flow benches, pump test bench and pump performance test systems, level sensor life test machines, dishwasher test equipment and washing machine test equipment.

Keywords: pump test bench, pump performance test, level sensor life test, dishwasher test equipment, washing machine test equipment.