Cast Steel Oval Gear Flow Meter Technical Documentation‌

Product Overview‌

The cast steel oval gear flow meter, classified as a positive displacement flow meter, represents a high-precision instrument for flow measurement. While historically prevalent, its usage has become less common in recent years, with digital display variants now dominating the market.

Applications‌

Designed for industrial sectors including:

• Chemical
• Petroleum
• Pharmaceutical
• Power generation
• Metallurgy
• Food processing

Technical Specifications‌

• Materials‌: Available in cast iron (Type A), cast steel (Type E), and stainless steel (Type B).
• Display Options‌:Analog (pointer-type totalizer)
• Reset function
• Pulse output
• 4–20mA output
• LCD display
• Communication output (e.g., RS485)
• Output Signals‌:Pulse, 4–20mA, or RS485 for integration with flow totalizers, enabling centralized monitoring, automated control, and data processing.
• Accuracy‌:Standard: ±1%R or ±0.5%R
• High-precision: ±0.2%R
• Repeatability‌: 0.05%–0.2% short-term, making it ideal for trade settlement when calibrated regularly.
• Frequency Signal‌: 3–4kHz, offering strong resolution and anti-interference capabilities.
• Rangeability‌: 1:20 for medium/large diameters; 1:10 for small diameters.

Additional Features‌:

• Compact design, easy installation/maintenance
• High-pressure compatibility (no body perforations required)
• Customizable variants (e.g., low-temperature, bidirectional, downhole, sand-mixed fluid applications)
• Insertion-type models for large pipelines (minimal pressure loss, cost-effective).

Operating Principle‌

The meter comprises a metering chamber housing a pair of oval gears, which rotate under differential pressure between inlet/outlet ports. Each rotation displaces a fixed volume of fluid (crescent-shaped cavity), with total flow calculated as the product of rotations and displacement volume.