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Adjustable Water Flow Meter: Variable Mechanical Orifice Flow Control Valves
Quick Answer: An adjustable water flow meter with a variable mechanical orifice flow control valve gives direct water flow indication and manual throttling in one body. Silver Automation Instruments supplies these units from DN15 to DN50 with brass, SS304, or SS316L wetted parts. Send your pipe size, flow range, water pressure, and connection type for a fast quote.
What is a variable mechanical orifice flow control valve?
A variable mechanical orifice flow control valve changes the open area through a tapered slot or an adjustable disk. The operator turns a knob or handle to set the required flow. A pointer or scale on the valve body shows the approximate setpoint. Unlike a motorized control valve, no power supply, control signal, or PLC logic is required.
In practice, these devices work well on water and low to medium viscosity fluids. The valve body has an inlet, an outlet, and a metering scale. When the operator adjusts the mechanical orifice, the differential pressure across the orifice changes. A small variable area meter or a direct scale reads the flow. That is the complete function.
Where these adjustable water flow meters are used
We have supplied these flow control valves to a plastics plant in Vietnam for mould cooling circuits. The maintenance team needed one valve per machine line to set 8 to 15 L/min manually. The team did not want to calibrate electromagnetic flowmeters on each circuit.
Other common sites include dust suppression skids in mining operations in Australia, boiler feed water lines in Indonesia, and food processing clean water lines in the Philippines. Because the valve is mechanical, the valve works well in remote areas with no 24 V DC power available.
A customer in Saudi Arabia ordered 40 units for a desalination plant laboratory. The flow range was 5 to 50 L/h and the connection size was DN15. The wetted material was SS316L. The location was unclassified so ATEX approval was not required.
Materials, sizes, and pressure drop
Silver Automation Instruments supplies adjustable water flow meters with variable mechanical orifice flow control valves in DN15, DN20, DN25, DN32, DN40, and DN50. Standard connections are BSP female thread, NPT female thread, or ANSI flange. Body materials include brass, SS304, and SS316L. Seals are NBR for fresh water or EPDM for higher temperature water.
The standard product series is called AWF-MO. A typical model code follows size and material. For example, AWF-MO DN25 SS304 means a DN25 body with SS304 wetted parts and a 10 to 100 L/min scale. Pressure rating is normally 10 bar at 20 °C for brass and stainless steel bodies. Temperature range for standard models is 0 to 90 °C. For water above 90 °C, specify a high temperature version with PTFE seals.
Flow ranges depend on pipe size and orifice bore. Typical water ranges include 1 to 10 L/min, 4 to 40 L/min, 10 to 100 L/min, and 20 to 200 L/min. The pressure drop across a variable mechanical orifice flow control valve is higher than a straight pipe. For gravity fed water lines, check the upstream head. A valve sized for 10 to 100 L/min may drop 0.2 to 0.8 bar. For low pressure systems below 0.3 bar, select an oversized body and a larger orifice.
Installation and practical notes
Install the flow control valve in a straight pip
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Mechanical flow control valves need no electrical wiring. They do need periodic cleaning if the water contains suspended solids. A simple procedure is to close the upstream isolation valve, remove the internals, flush with clean water, and reinstall. Quarter turn ball valves before and after the unit make maintenance easier.
Transmitters and output options
Some users ask if remote output is available. Yes. Selected AWF-MO models can accept a 4-20 mA transmitter or a pulse output. The output connects to a panel meter, PLC, or paperless recorder. The pulse output version is used for totalizing water volume in m³.
For automatic flow control, pair the mechanical valve with a separate electromagnetic flowmeter or oval gear flowmeter and a PID controller. The mechanical valve remains as a manual bypass or backup. This approach is common in desalination plants, cooling towers, and batch water filling systems.
How to request a quote
Send us your water flow range in L/min or m³/h, pipe size in DN, pressure in bar, temperature in °C, and connection type. Also state the wetted material you need: brass, SS304, or SS316L. Our engineers will select a variable mechanical orifice flow control valve with the correct bore and scale.
Contact Silver Automation Instruments at Tel: +86-25-68650347, Whatsapp: +86-25-52155837, WeChat: +86 15365082610. The website is flow-meter.com.au. We ship to Australia, Southeast Asia, the Middle East, Africa, and Latin America.
FAQ
Can an adjustable water flow meter with a variable orifice handle dirty water? These valves are not recommended for raw sewage or liquid with large particles. A 100 mesh Y strainer before the valve protects the seat and orifice. For muddy water or irrigation water, ask for a larger clearance model.
What is the accuracy of a mechanical orifice flow control valve? Typical indication accuracy is ±4 percent full scale for water at 20 °C. Repeatability is better than ±1 percent after the setpoint is locked. These valves are for flow control and repeatable batching, not for custody transfer.
Can the valve handle seawater or aggressive water? Yes, if you select SS316L body and PTFE or EPDM seals. Brass is not suitable for seawater. For continuous seawater service, Silver Automation Instruments can supply a duplex stainless steel or plastic lined option. Send the chloride level and operating temperature.
What is the difference between a variable area flow meter and a variable mechanical orifice flow control valve? A variable area flow meter usually measures flow only. A variable mechanical orifice flow control valve combines a throttling orifice with indication or control in one body. The valve changes flow, while the flow meter only reads flow.
Can the AWF-MO series accept a limit switch or analog output? Yes. Selected models can accept a 4-20 mA transmitter, a pulse output, or a mechanical limit switch. The transmitter is mounted on the pointer or the float assembly. Specify the output type when you send the quote request.