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Flowvis Flow Meter 2 Inch Manual: Sizing Check Valve Type Flow Indicators for Swimming Pools
Quick Answer: A Flowvis 2 inch manual flow meter with a check valve fits DN50 pool filtration lines that need visual flow confirmation and backflow prevention in one body. Size the unit by actual flow rate in liters per minute and by maximum pressure drop. For most commercial swimming pools the useful flow range is 80 to 250 liters per minute.
How to Size a 2 Inch Flow Meter for Swimming Pools
Pool pump lines carry water from the drain to the filter and back to the pool. A 2 inch flow meter fits DN50 pipe. That is the standard pipe size for many commercial pools, water parks, and hotel pools in Southeast Asia and the Middle East.
Start with actual flow rate. Do not size only by pipe diameter. A DN50 line can move 60 liters per minute or 300 liters per minute depending on the pump curve and filter head loss. Measure the flow or ask your pump supplier for the duty point. Most engineers skip the flow measurement step and then the float sticks or the unit gets damaged.
For a 2 inch manual flow meter on a pool loop, a practical flow range is 80 to 250 liters per minute. Below 60 liters per minute the float may not lift fully. Above 280 liters per minute the pressure drop climbs and the check valve can chatter. So the sizing window is narrow and physical.
Check Valve Type Flow Indicators: When They Make Sense
A check valve type flow indicator combines two functions. It shows flow with a moving float or paddle and stops reverse flow with an internal check mechanism. In swimming pools this matters because pump rooms are often below water level. When the pump stops, water wants to flow backward through the filter line.
Here is the thing. A separate check valve plus a separate sight glass adds two more joints and two more leak points. A combined check valve flow indicator reduces installation time on site. In practice, pool contractors in Queensland and Singapore prefer the combined design for retrofits.
But do not use a check valve flow indicator where the pump starts against a closed valve or where water hammer is severe. The internal check spring will wear fast. In those cases use a separate spring check valve and a plain flow indicator.
Flowvis 2 Inch Manual Flow Meter Specifications
Silver Automation Instruments stocks a Flowvis 2 inch manual flow indicator with a check valve cartridge. The common part number format is FV-50M-CV. The body is available in clear PVC or 316 stainless steel. For swimming pool service the PVC version with EPDM seals is enough in most low pressure chlorinated water lines.
Typical specs for the Flowvis 2 inch check valve flow indicator are as follows. Connection size DN50. End connection BSPT thread or ANSI 150 flange. Flow range 80 to 250 liters per minute. Maximum working pressure 10 bar at 20 degrees Celsius. Maximum water temperature 60 degrees Celsius. Accuracy plus or minus 5 percent of full scale. Check valve cracking pressure around 0.03 bar.
The float material can be 316 stainless or PTFE. For saltwater pool systems select the stainless float and FKM seals. For freshwater commercial pools EPDM seals work fine. Confirm chlorine concentration before you order because high chlorine shock dosing can embrittle standard EPDM over time.
Installation Tips for Pool Filtration Lines
Install the Flowvis 2 inch flow indicator in a vertical pipe with upward fl
Keep at least 10 pipe diameters of straight run before the inlet and 5 pipe diameters after the outlet. Pumps, elbows, and check valves create swirl. The float will bounce if you ignore this rule.
For outdoor pool plants in the Middle East, shade the flow indicator from direct sun. Clear PVC bodies degrade under strong UV exposure. A simple sheet metal cover extends the service life and keeps the scale readable.
Common Sizing Mistakes in Swimming Pool Flow Meter Projects
A common error is to assume pool flow equals pump maximum flow. In a real system, filter bags, sand filters, and pipe friction reduce the flow. The flow indicator should be sized for the actual operating point, not the pump nameplate. Last year a customer in Vietnam ordered 2 inch flow meters for a 150 cubic meters per hour pump. The actual pump duty was only 90 cubic meters per hour, so the floats barely moved.
Another mistake is to ignore backpressure. A check valve flow indicator adds pressure drop. In low head pool systems with small pumps, an extra 0.1 bar matters. Calculate total head loss before you replace a straight pipe section with a flow indicator.
Also check the chemical compatibility of the body and seals. Salt pools, ozone systems, and acid dosing lines all attack materials differently. Send the water chemistry detail to a flow meter supplier before final selection.
Flowvis 2 Inch Flow Meter FAQ
What flow range fits a 2 inch pool flow meter?
Select 80 to 250 liters per minute for most DN50 pool filtration loops. Confirm the actual pump duty first.
Can I install a Flowvis 2 inch flow indicator horizontally?
No. Install it in a vertical pipe with upward flow. Horizontal mounting makes the float stick or gives a false reading.
What is the maximum pressure for the Flowvis 2 inch check valve flow indicator?
The standard PVC body handles 10 bar at 20 degrees Celsius. Derate the pressure limit at higher water temperatures.
Does a check valve flow indicator replace a separate check valve?
Yes, for most pool pump lines. But for severe water hammer or high backpressure, use a separate spring check valve plus a plain flow indicator.
How do I get a quote from Silver Automation Instruments?
Send your flow range in liters per minute, pipe size DN50 or 2 inch, operating pressure in bar, and water temperature in degrees Celsius. Our sales team will reply with a price.
Get a Quote for Flowvis 2 Inch Flow Meters
Silver Automation Instruments supplies Flowvis 2 inch manual flow meters and check valve type flow indicators for swimming pools across Southeast Asia, Oceania, Latin America, Africa, and the Middle East. We support industrial water treatment contractors and pool equipment distributors.
Send us your pressure in bar, temperature in degrees Celsius, pipe size DN50 or 2 inch, and flow range. Contact Tel: +86-25-68650347. Whatsapp: +86-25-52155837. WeChat: +86 15365082610.
Tell us the pool type, the pump duty, and the chlorine or salt level. We will recommend the correct Flowvis model and body material. No generic catalogs. We reply to engineering questions with a specific model number.
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