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Liquid Flow Meter DN50: Two-Inch Nominal Diameter Commercial Utility Valves
Quick Answer: A DN50 liquid flow meter and a matching two-inch commercial utility valve handle the majority of water, light chemical, and HVAC utility lines in small to mid-size plants. You get a complete metering and isolation point with standard flanged connections that fit EN 1092-1 or ANSI B16.5 piping. Silver Instruments supplies inline electromagnetic, vortex, and turbine meters in DN50 size and can bundle them with the correct two-inch valve so you do not need to chase two suppliers.
Why DN50 and Two-Inch Valves Are a Practical Pair
DN50 equals a 2-inch nominal bore. In commercial utility loops, this size typically carries between 2 and 40 m3/h depending on fluid velocity and system pressure. We see DN50 flow meters next to two-inch ball or butterfly valves on cooling tower makeup lines, boiler feed water headers, and district heating substations. The valve gives simple shut-off for calibration or seasonal shutdown. When the meter and valve share the same flange drilling, installation takes less time. Here is the thing: many spec sheets overlook the bypass requirement. In practice, an extra two-inch valve in a bypass leg saves you from shutting down the whole header when the meter needs cleaning.
Meter Types That Fit DN50 Utility Duty
No single technology works for every fluid. For clean water and wastewater with conductivity above 20 µS/cm, an electromagnetic flow meter in DN50 is the workhorse. It has no moving parts, a PTFE or hard rubber liner, and outputs 4-20 mA HART plus a pulse you can wire to a totaliser. For low-conductivity liquids such as demineralised water, glycol mixtures, or light hydrocarbons, a vortex flow meter handles the job without a conductivity limit. Some sites still specify a turbine flow meter for custody transfer of diesel or fuel oil inside a two-inch line. The turbine gives you a fast pulse output and works with a local batch controller. All three types can be paired with a commercial utility valve that matches the pipe schedule.
Material and Connection Details Engineers Ask About
Body materials for DN50 meters range from 304 stainless steel to carbon steel with a corrosion-resistant coating. Electrodes on magmeters are often 316L, Hastelloy C, or titanium for seawater applications. Valve body options in two-inch utility service commonly include brass, 316 SS, or ductile iron with an epoxy coat. Lining and seal choices matter just as much. EPDM works for cold water up to 60 °C. PTFE suits solvents and temperatures up to 120 °C. Flange ratings align with PN16 or Class 150, which cover most commercial utility pressures. If you need ATEX Zone 1 or FM certification, specify it with the meter and the valve actuator so the entire assembly carries the right marking.
A Paint Plant in Southeast Asia Solved a Dual Sourcing Headache
Last year a paint manufacturer in Vietnam asked us for a DN50 flow meter and a two-inch ball valve for a solvent mixing station. Their pipe was schedule 40 carbon steel. The liquid was a toluene and ethyl acetate blend at 2 bar and 40 °C, with a conductivity so low a magmeter would not lock a reading. We supplied a stainless steel vortex flow meter with an integral temperature sensor for compensated mass flow in kg/h. The paired valve came with PTFE seats an
Common Signals and Integration Into Your BMS or PLC
A standard DN50 flow meter for utility monitoring is often ordered with 4-20 mA output and an RS485 Modbus RTU channel. The 4-20 mA loop goes to a building management system or a local paperless recorder. Modbus lets you pull flow rate, total, and diagnostic data into a PLC without extra wiring. Pulse output is still popular for batching small volumes of additive. When you combine the meter with a two-inch commercial utility valve that has a limit switch box, you can interlock the valve open status with the flow reading. But do not assume every valve comes with end-switches. Specify that detail in your RFQ.
Price Factors and Lead Times
Cost for a DN50 liquid flow meter ranges from a few hundred Australian dollars for a basic insert turbine to several thousand for a full bore electromagnetic meter with HART diagnostics. The two-inch utility valve adds a smaller increment, typically a cast steel ball valve or a wafer butterfly valve. Installation fittings, gaskets, and bolts are often overlooked in the initial budget. We recommend asking for a kit that includes the meter, the valve, mating flanges, and gaskets. Standard delivery from Silver Instruments to Jakarta, Melbourne, Jeddah, or Durango is three to four weeks for catalog configurations. Custom liners or exotic body materials may extend the lead time by two weeks.
FAQ
What liquids can a DN50 flow meter handle?
Electromagnetic DN50 meters work with any conductive liquid above 20 µS/cm. Vortex meters handle low-conductivity fluids, saturated steam, or light hydrocarbons in a two-inch line. Turbine meters are best for clean, low-viscosity oils and fuels.
Can I get a complete DN50 meter and two-inch valve package?
Yes. Silver Instruments ships the flow meter and the commercial utility valve as a single kit with matching flange standards, material certificates, and one invoice. This eliminates the finger-pointing that happens when you buy the meter from one vendor and the valve from another.
What output signals are available for the DN50 meter?
Standard outputs include 4-20 mA HART, passive or active pulse, and RS485 Modbus RTU. Optional outputs like Modbus TCP or a local digital display are available. Tell us what your control system expects and we will configure the meter accordingly.
Is the two-inch valve compatible with European or American flanges?
We can supply a two-inch utility valve drilled to EN 1092-1 PN16 or ANSI B16.5 Class 150 depending on your site standard. Just mention the flange specification when you send your enquiry.
How do I ask for a quote for a DN50 liquid flow meter and valve?
Send us four numbers: operating pressure in bar, liquid temperature in °C, pipe size in DN, and the minimum and maximum flow range in m3/h or kg/h. Attach a photo of the pipe flange if you are not sure about the standard. Our team will reply with a data sheet and a price within one working day.
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