Tank Bulged or Relief Valve Dripping All Day? NL-RVF-4 Water Heater Relief Valve Test Bench (pump performance test)

Storage water heaters produce two opposite complaints about one small part. When the tank bulges or a joint lets go, the relief valve never lifted at set pressure — spring fatigue or a stuck seat let the set point wander far outside its band. And when the same valve drips around the clock, the household files it as a leaking heater, though the real fault is a worn sealing face that never reseats cleanly. Production usually samples one or two valves on a manual rig: no per-unit set-point record, no proof the discharge path passes enough flow, no reseat differential, no thermal check. Service ends up blamed from both sides with no valve data on the table.

What the NL-RVF-4 relief valve bench measures

• Four stations, set pressure: slow ramp, lift point logged per unit and auto-judged inside the 0.6-0.9 MPa band (the valve-flow branch of our pump performance test systems)
• Discharge capacity: full-lift flow recorded, capacity curve plotted under back-pressure duty
• Reseat differential: closing pressure logged with chatter and rapid cycling identified, non-reseating valves pulled on the spot
• Tightness steps: staged hold below set pressure, per-unit micro-leak quantified so “drip or defect” has a number
• T&P combination valves: thermal element actuation verified at high temperature, both channels checked independently
• Cycle life: set point and tightness re-measured after thousands of lifts, spring decay plotted against cycles
• Anti-siphon and vacuum-break function (where fitted): negative-pressure action verified per unit
• Barcode and batch binding, set point, discharge and leak data exported per unit, matching the appliance maker’s report format

Applicable standards

GB 4706.1 (household appliances – general safety), GB 4706.12 (storage water heaters – particular requirements), GB/T 12243 (spring-loaded safety valves), IEC 60335-2-21 and GB/T 2828 sampling; set-pressure band and discharge criteria can follow the customer’s standard and valve specification.

Stations and throughput

Four stations running continuously replace “sample one, press once” with per-unit lift points, discharge curves and tightness data in one pass — so incoming valves, heater matching and end-of-line sampling share one bench, keeping bulged tanks and drip complaints out of the field.

Manufacturer

Guangdong Endurance Electronic Equipment Co., Ltd. — a non-standard testing equipment manufacturer of water heater relief valve 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.