Wedge flowmeter is a type of side wall contraction throttling device.Wedge Flow meterThe detection element is a wedge-shaped component, which is a piece ofVShaped throttling componentIts smooth top angle faces downwards, which is conducive to the smooth passage of liquids or viscous liquids containing suspended particles, and will not cause retention on the upstream side of the throttle. Wedge shaped flow sensor andDifferential pressure transmitterSupporting facilities have a wide range of applications in fields such as petroleum, chemical, metallurgical, and municipal engineering. Especially in the measurement of fluid flow rates containing fixed suspensions such as mud, sand containing crude oil, slurry, residual oil, and heavy oil, it has unique advantages.

Wedge flowmeter can be used for flow measurement of high-temperature and high viscosity media, especially for media containing solid particles and dust (such as catalysts, coal powder, etc.) that are prone to wear and blockage of the flowmeter. It can also be used for gas flow measurement, especially for gas flow measurement containing dust, and can be used for two-phase flow measurement and liquid flow measurement that is prone to gas precipitation.

Wedge flow meters are generally installed horizontally and can also be installed on vertical or inclined pipes; The pressure interface nozzle of the instrument is generally adopted2”or3”Flange nozzle. （Larger pressure area,Faster response time）

During installation,Generally, the pressure nozzle is horizontal or upward,

To facilitate the flow of solid particles under the wedge block.

To ensure good fluid flow and measurement accuracy, the length of the straight pipe section before and after the pressure port should be the same as the front10Dafter5D（DMeasuring the inner diameter of the tube; If it cannot be met due to environmental limitations, at least ensure the preceding5Dafter3DThe impact on measurement accuracy is not too significant. For particularly viscous media; There are no special requirements for the front and rear straight pipe sections, the front5Dafter3DJust enough.

The measurement of differential pressure generally uses a double flange diaphragm box remote transmitter. When the measured medium temperature or pressure is high, a pressure cut-off valve (gate valve) is installed; For high-temperature media, the method of extending the pressure tube is adopted to reduce the temperature of the medium reaching the membrane box; For high viscosity media, add a flushing oil ring to prevent adhesion on the membrane boxcoking.

The flowmeter is installed horizontally, with the pressure tap positioned at a distance from the vertical centerline45°~90°The angle is the recommended installation method under normal circumstances (as shown in the figure). This installation scheme can allow a small amount of solid flow mixed in the liquid to pass smoothly through the wedge section, avoiding accumulation at the throttle aperture and affecting the passage of the fluid. It can also prevent air (gas) mixed in the liquid flow from accumulating at the top of the pipe and affecting the change in differential pressure, thereby affecting the measurement accuracy of the transmitter.

To ensure the good operation of the wedge flowmeter, in addition to meeting the installation requirements mentioned above, strict attention should also be paid to the following points:

(1)Properly empty the transmitter.

(2)Adjust the zero point of the transmitter to compensate for the liquid pressure head difference caused by the height difference of the impulse tube, and avoid its impact on the measurement results. This impact is particularly evident in vertically installed wedge flow meters.