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Water Flow Meter with Shut Off: Smart Leak Detection Electronic Valves
Quick Answer: A water flow meter with shut off combines a flow sensor with an electronic valve that closes on abnormal flow. Silver Automation Instruments supplies these units in DN15 to DN200 with 4-20 mA HART, pulse, RS485 Modbus, and relay outputs. Send your pipe size, fluid, flow range, pressure, and temperature for a quotation.
What Problem Does This Device Solve?
Most flow meters only measure and transmit a signal. They do not stop a leak. A water flow meter with shut off adds an electronic valve that acts on the meter reading. In practice, a food plant in Malaysia set a no flow window from midnight to 05:00. A pipe fitting cracked at 02:30. The meter read 3.1 m³/h during a period that should have been zero. The valve closed in 4 seconds. Water loss stayed small and the plant avoided a shutdown.
This matters for small and mid size industrial sites. A factory with 10 to 100 workers often has no flow monitoring team on night shift. The meter and valve pair works as a simple automatic protection loop. You do not need a PLC for basic leak detection. The built in relay can drive the valve directly or send an alarm to a building management system.
Where These Meters Fit in Industrial Water and Wastewater Lines
We recommend these devices for water intake lines, cooling water loops, washdown systems, batching lines, pump discharge, and wastewater bypass. Typical pipe sizes are DN15 to DN200. Larger sizes up to DN600 are possible but the valve becomes heavy and needs a motorized actuator.
For conductive water, an electromagnetic flow sensor works well. The water should have a conductivity of at least 5 µS/cm. A DN50 version from Silver Automation Instruments has an accuracy of ±0.5 percent of reading, PTFE liner, 316L electrodes, and a flow range of 0.5 to 100 m³/h. You can add a PT100 probe for temperature readings if your process needs it. For non conductive water or glycol, an inline ultrasonic sensor is a better fit. Accuracy is around ±1.0 percent of reading. Both versions can feed a 4-20 mA HART signal to your panel and close an electronic ball valve or butterfly valve.
Smart Leak Detection Logic You Can Configure
Set a high flow limit, a low flow limit, and a no flow window. For example, a chemical batching plant in Thailand uses a high flow limit of 12 m³/h on a 2 inch line. If flow exceeds 12 m³/h for more than 5 seconds, the electronic valve closes. This catches a burst hose or an open bypass. A pump station in Chile uses a low flow threshold to detect a closed inlet valve and stop the pump before it runs dry.
Most engineers skip this part. They treat the shut off valve as a simple on off device. But the detection band is what prevents false trips. Set the delay time, hysteresis, and alarm output. A small paint factory in Indonesia set the delay too short at first. Water hammer caused repeated false trips. After a field visit, we adjusted the delay to 8 seconds and the false trips stopped.
Installation and Wiring on Site
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Installation follows standard flow meter practice. For electromagnetic versions, allow five straight diameters upstream and three downstream. Match the flange standard to your pipe. We supply DIN, ANSI, and JIS flanges. For food and beverage lines, tri clamp connections are available from DN15 to DN80. The electronic valve can be mounted close to the meter or a few meters away if you need access space.
Power options are 24 VDC or 85-265 VAC. Outputs include 4-20 mA HART, pulse, RS485 Modbus, and two relay outputs. The relay outputs can trigger an alarm horn, a light stack, or a BMS input. If you need ATEX Zone 1, tell us early. We have supplied explosion proof versions for a solvent recovery line in Oman.
Recommended Models and Selection Data
Silver Automation Instruments offers three common builds for water flow meter with shut off jobs. The SIL-WF-SO-EM series uses an electromagnetic flow sensor plus an electronic ball valve in DN15 to DN100. The SIL-WF-SO-US series uses an inline ultrasonic flow sensor plus a butterfly valve in DN25 to DN200. The SIL-WF-SO-VM series uses a vortex flow meter with shut off for hot water, steam condensate, or cooling water above 120 °C.
For a standard DN50 water line at 2 to 30 m³/h, we often quote the SIL-WF-SO-EM50 with PTFE liner, 316L electrodes, PN16 flanges, 24 VDC power, 4-20 mA HART output, and a motorized ball valve. If the line is DN100 and flow reaches 150 m³/h, the SIL-WF-SO-US100 with a butterfly valve is more cost effective.
FAQ: Water Flow Meter with Shut Off and Leak Detection
Q1: What is the difference between a water flow meter with shut off and a normal flow meter?
A normal flow meter only measures flow and transmits a signal. This unit adds an electronic valve that closes on a set threshold. One device can detect a leak and stop the flow without a separate controller.
Q2: Can the shut off valve close automatically when a leak occurs?
Yes. Set a high flow limit, a low flow limit, or a no flow window. When the meter reads outside that band, the relay output closes the valve. Response time is usually under 5 seconds.
Q3: Which industries use this device most often?
Water treatment, food and beverage, chemical batching, HVAC chilled water, pump stations, and washdown lines. Small and mid size plants use it as a simple automatic protection loop.
Q4: What pipe sizes and outputs do you support?
Standard pipe sizes are DN15 to DN200. Larger sizes up to DN600 are possible on request. Outputs include 4-20 mA HART, pulse, RS485 Modbus, and two relay outputs.
Q5: How do I get a price for a specific project?
Send your pipe size, fluid type, flow range, pressure, temperature, and power supply. Contact Silver Automation Instruments at Tel +86-25-68650347, WhatsApp +86-25-52155837, or WeChat +86 15365082610.
Silver Automation Instruments contact: Tel +86-25-68650347 | WhatsApp +86-25-52155837 | WeChat +86 15365082610