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Quick Answer: A wedge flow meter is a differential pressure device built for viscous slurries, dirty liquids, and abrasive streams. It uses a V-shaped restriction that resists plugging and wear better than orifice plates. Silver Automation Instruments is a wedge flow meter manufacturer and supplier for sludge, crude oil, paper stock, mining slurry, and food waste lines.
A wedge flow meter forces process fluid around a V-shaped wedge. The wedge sits inside the pipe and creates a differential pressure across the restriction. A DP transmitter converts that pressure drop into a flow rate. The flow calculation uses the same Bernoulli principle as an orifice plate, but the shape is different.
The V shape leaves an open bottom gap. Solids can pass through that gap. In a viscous slurry line this matters. Most engineers skip this part, but a flat orifice plate can collect solids behind the plate. A wedge meter does not have a step where solids build up.
We have seen this on customer sites many times. A wastewater plant in Indonesia replaced a magnetic flow meter that fouled with grease. The wedge meter kept measurement stable because the restriction shears the slurry.
Viscous slurries have high cP values and often carry solid particles. They can blind an orifice plate, coat an ultrasonic sensor, or short a magnetic flow meter electrode. A wedge flow meter handles these conditions because it has no moving parts and no narrow impulse lines if you use remote seals.
Silver Automation Instruments recommends a wedge meter with a remote seal DP transmitter for fluids above 500 cP. For thick paper stock at 3 to 5 percent consistency, use a DN50 to DN200 wedge meter with stainless steel body. For mining tailings with 10 percent solids, use a hard facing option on the wedge.
In practice, a wedge meter works from low Reynolds numbers. This is useful for heavy crude oil, polymers, and concentrated sludge. The V-shaped restriction produces a stable DP signal even when flow is laminar.
Wedge flow meters fit many industrial lines. Common fluids include crude oil, refinery bottoms, lime slurry, coal slurry, paper stock, ceramic slip, and food waste. A paint manufacturer in Southeast Asia asked us for a flow meter on an 8 000 cP resin line. The existing orifice plate plugged within two weeks. We supplied a wedge meter with a PTFE-lined body and a remote seal transmitter. That solved the plugging problem.
Sites in Australia, Saudi Arabia, and Nigeria use wedge meters on sludge and waste streams. A desalination plant in the Middle East needed a flow meter for a 15 percent calcium carbonate slurry. The wedge meter held up because the gap allowed solids to pass.
The device is not limited to slurries. It also works on clean liquids and steam. But the main reason buyers choose a wedge meter is solids handling.
We build wedge flow meters from DN15 to DN300 as standard. Larger sizes are available for special projects. Body materials include 316L stainless steel, carbon steel, and duplex stainless steel. Wetted parts can be coated or hard faced for abrasive service.
Output options include 4-20 mA HART, Modbus, and pulse. For hazardous areas, we supply ATEX Zone 1 transmitters with flameproof or intrinsically safe ratings. A PT100 temperature sensor can be added if temperature compensation matters. Typical accuracy is 0.5 to 1 percent of rate depending on the flow range and Reynolds number.
Process connections include flanged, wafer, and threaded types. Pressure ratings go up to PN40 or ASME 300. We also supply remote seal capillaries for slurry service. This keeps the DP transmitter away from vibration and heat.
An orifice plate needs regular inspection because the plate edge wears. A magnetic flow meter can fail when electrodes get coated. A vortex meter can lose signal in thick slurries. A wedge flow meter has no moving parts and no flat plate edge to wear quickly.
Because the open bottom gap reduces solids accumulation, routine maintenance is mostly visual inspection and transmitter zero checks. Some sites clean the meter during shutdown. Others leave it in place for years.
Send us your pressure in bar, temperature in °C, pipe size in DN, and flow range in kg/h or m3/h. Also tell us the fluid name, viscosity in cP if known, and percentage of solids. So if you have a line size but no flow data, we can still help.
Contact Silver Automation Instruments at Tel: +86-25-68650347, WhatsApp: +86-25-52155837, or WeChat: +86 15365082610. You can also visit flow-meter.com.au for more product details. We serve process plants and distributors in Southeast Asia, Oceania, Latin America, Africa, and the Middle East.
What fluids suit a wedge flow meter? Viscous slurries, dirty liquids, sludge, crude oil, paper stock, and liquids with solids. It also works on clean water and steam if you need a robust DP meter.
Can a wedge flow meter handle abrasive solids? Yes. The open bottom gap allows solids to pass. You can also add a hard facing layer on the wedge and body for mining slurry.
What output signal is available? Standard output is 4-20 mA HART. Modbus and pulse are optional. ATEX Zone 1 transmitters are available for hazardous areas.
How is maintenance done on a wedge flow meter? Most sites do a visual check and a transmitter zero check. You do not need to remove the meter unless the process inspection plan requires it.
What information do you need for a price quote? Send pipe size DN, fluid, flow range, pressure, temperature, viscosity, and solids percentage. We can then recommend a model and transmitter.
