Model: NL-KFGLQ-2
The problem
The boiler seal ring is the cheapest and most troublesome part in a coffee machine: a ring worth a few yuan that weeps at 20bar brings leakage current, tripped breakers and batch rework. Line checks at three or four bar of tap water reach only a third of working pressure, so micro-leaks never show; they surface only when the machine runs high-pressure extraction and the ring softens with heat - by which time a whole batch is at risk.
Capability
The bench tests at the upper limit of working pressure: water is pressurised to 20bar at port A while port B is plugged, held for 5-10s, and judged by the pressure drop, with a 0-2.5MPa booster pump and accumulator holding accuracy at 0.01MPa. Two stations run independent PLCs and test two 62x36mm heating elements at once. A power meter above 3000W displays per station, so leak checking and power verification happen on the same fixture, and the independent 100-240V variable supply accepts UK and US plug models. Water filling, internal-leak and external-leak times are each settable 0-99.99s, and the 0-999999 counter extends the same machine into repeated pressurise-release endurance for ring compression set and rebound. Relief water returns to the tank for reuse, so long runs waste nothing. Fixtures are quick-change aluminium with KLH clamping matched to the element drawing. Takt is 30-40s per piece, about 180-220 pieces per hour on two stations.
Applicable standards
The assessment follows the structural safety clauses (vessel pressure retention and over-pressure protection) of Chapter 22 of GB 4706.1 General requirements for household and similar electrical appliances, with whole-machine safety under GB/T 4706.19-2024 for liquid heating appliances; the 20bar test pressure, hold time and pressure-drop criteria follow the customer technical agreement and the element drawing.
Key specifications
- Stations: 2, independent control
- Test piece: boiler heating element, 62 x 36mm diameter
- Test pressure: 20bar (2.0MPa) water
- Hold: 5-10s adjustable, judged by pressure drop
- Pressure accuracy: 0.01MPa
- Booster pump: 0-2.5MPa with accumulator and relief valve
- Timing: water filling, internal leak, external leak each 0-99.99s
- Cycles: 0-999999 settable (repeated pressurise-release endurance)
- Fixture: quick-change aluminium, KLH pneumatic clamping
- Power meter: above 3000W, displayed per station
- Supply: independent variable 100-240V, 50/60Hz
- Relief: automatic after test, water recycled to tank
- Structure: splash-proof top with drainage, fire-retardant board
Applications
Shipment inspection at boiler and heating element suppliers; incoming inspection and line sampling at coffee machine plants; re-inspection after seal ring replacement and ring selection trials
About the manufacturer
Guangdong Endurance Electronic Equipment Co., Ltd provides non-standard customization, drawing confirmation, factory acceptance, on-site installation and commissioning, operation training and long-term technical service; 12-month warranty and long-term spare parts supply. Tel: 0760-88500902 / 13416787649. Web: en.zsnaili.com.