The JSJ4 Positive Displacement Flow Meter stands as an industry standard for commercial fuel dispensers and modern service station equipment. Designed around a time-tested 4-piston reciprocating architecture, the JSJ4 converts the mechanical movement of fluid into ultra-precise rotational measurement. Built to handle demanding commercial environments, its proven internal mechanics deliver low maintenance overhead and an operational lifespan exceeding a decade.
JSJ4 Flow Meter Key Features & Highlights
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Time-Tested Internal Architecture: Utilizes a precise 4-piston mechanical drive linked to a crankshaft mechanism, ensuring consistent measurement stability over extended operational periods.
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Long Operational Lifespan: Engineered with high-grade, anti-wear internal materials, the JSJ4 delivers a service life of at least 10,000,000 Liters.
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High Measurement Precision: Features a tight accuracy margin of ±0.2% alongside excellent repeatability (≤0.1%), meeting international metering standards for retail and commercial fuel dispensing.
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Broad Operational Range: Smoothly accommodates flow rates from 5 L/min up to 100 L/min, making it versatile for both standard and high-flow dispensing units.
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Compact & Easy Integration: Its robust yet compact body simplifies installation and retrofitting into various major fuel dispenser brands and fuel management systems.
JSJ4 Flow Meter Technical Specifications
| Parameter | Specification Details |
| Measurement Principle | Positive Displacement (4-Piston Reciprocating) |
| Flow Rate Range | 5 L/min – 100 L/min |
| Discharge Rate per Revolution | 0.5 L / rev |
| Measurement Accuracy | ±0.2% (across 5–100 L/min range) |
| Repeatability Error | ≤ 0.1% |
| Working Pressure Range | 0.12 MPa – 0.35 MPa |
| Working Lifespan | ≥ 10,000,000 Liters (10+ Years standard service) |
| Applicable Media | Gasoline, Diesel, Kerosene, and related light fuel oils |
JSJ4 Flow Meter Operating Principle
When pressurized fuel enters the meter chamber from the pump, it acts directly upon four internal reciprocating pistons. The precise volumetric displacement pushes these pistons in a synchronized sequence, converting fluid pressure into smooth rotational torque via a central crankshaft mechanism.
Every complete cycle of the crankshaft corresponds to exactly 0.5 Liters of fluid passed through the meter. This rotational motion is then directly transmitted to either a mechanical register or an electronic pulser for accurate volume computation and display.
JSJ4 Flow Meter Typical Applications
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Commercial Petrol & Diesel Dispensers: Ideal primary component for retail gas station pumps.
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Fleet Refueling Depots: Built for heavy-duty daily use in logistics parks, bus depots, and industrial fueling stations.
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Mobile Tank Trucks & Skid Systems: Compact design enables seamless integration on tank trucks and portable dispenser skids.
