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Quick Answer: For local water flow confirmation without power or wiring, the Silver Instruments WFG series mechanical dial gauges give an instant visual check. The range covers DN15 to DN100 in brass, 304 stainless steel, and PVC. Send your pipe size DN, pressure in bar, temperature in degrees Celsius, and flow range for a detailed quote.
Silver Automation Instruments has supplied these gauges to users in Indonesia, Vietnam, the Philippines, Mexico, Chile, Saudi Arabia, and Kenya. The design is simple. A spring loaded vane moves with water flow. A mechanical linkage drives a dial needle. The operator sees the needle position and knows immediately if flow is present, low, or normal.
Many water lines do not need a magnetic flow meter or an ultrasonic flow meter. They need a local visual check. A mechanical dial gauge costs less than a transmitter based flow meter and can be installed in minutes. No power supply is needed. There is no I/O card to wire. Operators do not need display configuration. Maintenance teams in water treatment plants and food factories keep them on pump skids and cooling loops.
Here is the thing. In practice, a mechanical gauge often works where an electronic meter fails. It survives washdown areas, humid environments, and simple panels. We have seen this on customer sites many times.
Models cover WFG-015, WFG-020, WFG-025, WFG-032, WFG-040, WFG-050, WFG-065, WFG-080, and WFG-100. The number after WFG is the DN size in millimetres. Connections are threaded BSP or NPT. Standard pressure rating is 10 bar, with 16 bar available for some ranges. Temperature limits are 90 degrees Celsius for acrylic windows and 120 degrees Celsius for glass windows. Accuracy is normally plus or minus 2 percent full scale for water at 20 degrees Celsius.
Flow ranges start at 1 to 5 L/min for WFG-015 and extend up to 50 to 250 cubic meters per hour for WFG-100. Body materials include brass, 304 stainless steel, and PVC for selected sizes. Wetted parts can be selected for clean water, cooling water, or mild chemical service. Standard models do not include a 4 to 20 mA output. Some models accept a reed switch for a simple high or low set point.
A desalination plant in Saudi Arabia uses WFG-050 brass gauges on membrane feed lines. Operators check the dials during routine rounds. A beverage plant in the Philippines installed WFG-025 stainless steel gauges on bottle rinser water lines. A shrimp processing plant in Ecuador uses PVC body gauges on seawater intake lines. A chemical distributor in Vietnam uses WFG-040 gauges on cooling water return lines.
Typical locations include pump discharge lines, heat exchanger water feed, filter inlet and outlet, cooling tower return, washdown headers, and boiler feed water bypass lines. These gauges also work on light chemical water where the wetted materials are compatible.
Give us four details and we can recommend a model. Pipe size DN, connection thread standard, flow range in L/min or cubic meters per hour, and fluid temperature. Pressure is also useful. For example, a customer may say DN40, BSP, 20 to 100 L/min, water at 25 degrees Celsius, 6 bar. That is enough for a firm quote.
Mount the gauge where the dial is easy to see during operator rounds. Keep a short straight run before and after the gauge when possible. Five pipe diameters upstream and two downstream is enough for most mechanical gauges. Install a strainer upstream if the water carries sand, rust, or solid particles. The gauge needs no electrical connection and no signal cable. For outdoor installations, specify an IP65 dial housing.
Mechanical water flow gauges are economical. Small brass gauges in DN15 or DN20 often start under USD 40. Larger stainless steel or PVC models cost more depending on size and range. We keep standard WFG ranges in stock at our Nanjing warehouse. Lead time for standard models is 3 to 5 working days. Custom ranges or special body materials take 2 to 4 weeks.
Can a mechanical water flow gauge be used on dirty water? Yes, if you install a strainer upstream. For heavy solids, choose a model with a larger body gap or use a clamp on ultrasonic flow meter instead.
Do these gauges work in vertical pipes? Yes. Specify flow direction and pipe orientation when ordering. We set the mechanical stop and dial orientation for upward or downward flow.
What is the difference between brass and 304 stainless steel? Brass is cheaper and fine for clean cooling water. 304 stainless steel resists corrosion better for food plants, coastal sites, and light chemical water.
Can I get a switch output from a mechanical water flow gauge? Some models can be fitted with a reed switch for a simple high or low set point. The reed switch signal is not a 4 to 20 mA output. The switch signal only tells a PLC if flow is above or below a set point.
How do I request a quote? Send your pipe size DN, connection type, flow range, pressure in bar, and temperature in degrees Celsius. Contact Silver Instruments at Tel: +86-25-68650347, Whatsapp: +86-25-52155837, WeChat: +86 15365082610.
We ship these gauges to Southeast Asia, Oceania, Latin America, Africa, and the Middle East. Standard export packaging includes foam lined cartons and outer boxes for courier or sea freight.
