Dishwasher Full of Smelly Standing Water, Sewer Odor Backing Up? NL-DCV-4 Drain Check Valve and Residual Water Bench, Six Stations (dishwasher test equipment)

Dishwashers that finish with half a finger of murky water in the sump, a sewer smell that hits you on opening, and slime coating the filter overnight; in bad cases waste water and odor siphon back through the pump into the cavity. The cause sits in the drain line check valve: a flap jammed open by debris, an aged seat, an inverted body or lost spring force, so the standing column drains back once the pump stops. The line test is one drain timing; how much residual water is left and at what back pressure the check valve starts to leak are both unknown, so odor complaints come back with no evidence to check.

What the NL-DCV-4 drain check valve and residual water bench measures

• Six stations in parallel cycling drains at set back pressure and level, then re-measuring residual water and backflow rate after each cycle (the drain-line branch of our dishwasher test equipment)
• Check-valve leakage: back pressure stepped up against the valve, logging the pressure where seepage starts and how much passes
• Drain pump duty logged alongside: flow-head points captured in the same cycle to tell a weak pump from a leaking check (pump performance test applied at appliance level)
• Soil and detergent duty cycles: food-soil liquor circulated at set ratios to test flap sticking and fouled seats
• Anti-siphon verification under the installed hose height and siphon conditions, closing the odor path
• Barcode and batch binding, with raw data exported per unit for valve and hose lot comparison

Applicable standards

GB 4706.1 (household appliances – general safety), GB 4706.25 (dishwashers – particular requirements), IEC 60335-2-5 (dishwashers – particular requirements), GB/T 20290 (electric dishwashers – methods for measuring performance) and GB/T 2828 sampling; criteria can follow the customer’s standard and the drain-line construction.

Stations and throughput

Six stations running 24/7 turn opening the door for a look and a sniff into data with back pressure, seepage volume and residual depth, with check sealing and residual water rechecked round by round — so incoming valves and end-of-line dishwashers can both be sampled batch by batch, stopping smelly sumps and backflow before shipment.

Manufacturer

Guangdong Endurance Electronic Equipment Co., Ltd. — a non-standard testing equipment manufacturer of drain check valve and residual water 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.