Professional English Translation of Domestic Oval Gear Flow Meter

Product Overview‌

The ‌domestic oval gear flow meter‌ (a positive displacement meter) is a precision instrument widely used in industrial flow measurement applications. It is particularly suitable for sectors including:

Chemical

Petroleum

Pharmaceutical

Power generation

Metallurgy

Food processing

Technical Specifications‌

1. ‌Material Variants‌

Standard models‌:

Cast iron (Type A)

Cast steel (Type E)

Stainless steel (Type B)

2. ‌Display & Output Options‌

Mechanical display‌:

Pointer-type totalizer

Reset function

Electronic display‌:

Instantaneous/total flow LCD

Pulse/4–20mA/RS485 output

Communication protocols (e.g., Modbus)

3. ‌Performance Metrics‌

Accuracy‌:

Standard: ±1% R or ±0.5% R

High-precision: ±0.2% R

Repeatability‌: 0.05%–0.2% (short-term)

Signal output‌:

Pulse frequency (3–4 kHz)

No zero drift, high interference resistance

Turndown ratio‌: 1:20 (large bore), 1:10 (small bore)

4. ‌Design Features‌

Compact structure, easy installation

High-pressure compatibility (no body perforation)

Customizable variants:

Low-temperature

Bidirectional flow

Submersible

Sand-slurry resistant

Insertion-type available for large pipelines

Operating Principle‌

Fluid Measurement‌:

A pair of elliptical gears rotates within a crescent-shaped chamber.

Each rotation displaces a fixed volume (non-hermetic due to rotation).

Flow Calculation‌:

Total flow = Gear rotations × 4 × chamber volume.

Pressure differential between inlet/outlet drives gear movement.

Material Compatibility‌

Fluid Type‌ ‌Examples‌ ‌Recommended Material‌

Corrosives‌ Acids, alkalis Stainless steel (316L)

Oils/Fuels‌ Hydraulic oil, diesel Cast steel

Food-grade‌ Edible oils, syrups Stainless steel (304)