Top Rack Comes Out Streaked While the Bottom Is Spotless? NL-DVR-6 Diverter Valve and Water Distribution Bench, Six Stations (dishwasher test equipment)

Dishwashers that leave the top rack streaked and gritty while the bottom comes out spotless, or the reverse with a rush of water upstairs and almost nothing below, so half the load is clean and half is not. The diverter valve feeds the upper and lower spray arms in turn; a valve that misses its stop, seal faces worn into grooves or a return mechanism with an offset will unbalance the two circuits. Type testing on the line usually looks at one spray pattern, so whether the valve still lands accurately after several thousand switches and how far the flow split has moved are unknown before shipment — in the household it only shows up as dishes that will not come clean, and the fix is a whole-machine return with the freight and downtime on the manufacturer.

What the NL-DVR-6 diverter valve and distribution bench measures

• Six stations, each with its own water circuit and program, alternating upper and lower feed at a realistic wash rhythm (the water-distribution branch of our dishwasher test equipment)
• Stop angle and switching time: an angle sensor logs both on every switch, plotted as an offset curve against switch count
• Flow split between circuits: upper and lower flow metered at the same time, giving the split ratio and its deviation from setpoint
• Switching endurance: continuous running to a set count, then automatic stop with missed stops and cross-leakage events counted
• Seal face cross-leakage: leakage into the idle circuit with only one side supplied, resolved down to 0.1L/min
• Drive current and stall: current logged as switching resistance rises, an early warning of face wear
• Hot water duty: 60°C water with detergent, bringing out ageing in the plastic body and seals
• Barcode and batch binding, with raw data exported per unit for valve body and seal lot comparison

Applicable standards

GB 4706.1 (household appliances – general safety), GB 4706.25 (dishwashers – particular requirements), GB/T 20290 (electric dishwashers – methods for measuring performance), IEC 60436 (electric dishwashers – methods for measuring performance) and GB/T 2828 sampling; criteria can follow the customer’s standard and the valve construction.

Stations and throughput

Six stations running 24/7 turn one spray pattern watched by hand and a feel of the top rack into stop angle, flow split and cross-leakage data, with seal wear and return offset rechecked round by round — so incoming valves and end-of-line machines can both be sampled batch by batch, stopping half-clean loads and returns before shipment.

Manufacturer

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

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