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3/4 Inch Flow Meter: Three-Quarter Inch Residential Brass Submeters
Quick Answer: A 3/4 inch flow meter is a three-quarter inch residential brass submeter used for tenant billing, irrigation monitoring, and villa water supply lines. It handles normal residential flow from 30 litres per hour to 4 cubic metres per hour at pressures up to 16 bar. Choose a dry dial and pulse output if you need local reading plus remote data collection from apartment or villa meters.
What Is a Three-Quarter Inch Residential Brass Submeter?
A three-quarter inch residential brass submeter is a positive displacement or multi-jet water meter with nominal bore DN20. The threaded connections are usually 3/4 inch BSP or NPT. Silver Instruments keeps both thread types in stock for export orders. This size sits between DN15 and DN25. It is popular because most residential branch lines in Southeast Asia, Australia, and the Middle East use 20 mm or 3/4 inch piping. The brass body holds up against hard water, sand, and chlorinated supply. Many field failures come from plastic bodies cracking at the fitting point. Brass avoids that problem.
Where a 3/4 Inch Residential Brass Flow Meter Is Used
We see these meters in condominium riser closets, villa distribution boxes, terrace houses, laundromats, and small irrigation zones. In practice, the 3/4 inch flow meter is the first choice for individual unit billing. A property developer in Manila ordered 1,200 units for a 300 unit condominium project in 2023. They installed one meter per unit on the cold water line. The meter allowed the building management to bill each tenant based on actual water use instead of splitting the main bill by unit area. That change reduced complaints and cut total water consumption by 18 percent in the first six months. A small laundromat chain in Guadalajara uses the same 3/4 inch brass flow meter on every wash water line. Their maintenance team keeps one spare meter on the shelf for quick swaps.
Key Specifications for a 3/4 Inch Brass Flow Meter
For quoting purposes, these are the values we ask before we recommend a model:
- Nominal size: DN20, 3/4 inch
- Body material: brass, lead-free or DZR on request
- Flow range: 30 to 4000 litres per hour
- Q3 value: 4 cubic metres per hour
- Pressure rating: PN16, 16 bar
- Temperature rating: 50 °C for cold water, 90 °C for hot water version
- Pulse output: 1 or 10 litres per pulse
- Accuracy class: Class B, R80 or R100
Most engineers skip the smaller DN15 meter when the pipe is already 3/4 inch. A DN15 meter can create an avoidable pressure drop. The DN25 unit costs more and needs reducers. So the DN20 brass submeter fits the pipe size and the billing requirement without extra fittings.
Why the Brass Body Matters
Brass is not exotic. It is not the cheapest. But for residential submetering it works. A brass body resists corrosion and does not crack like some nylon or PPS housings under site handling. In the Middle East, we often supply dezincification-resistant brass because the water can have high chloride. In coastal areas of Vietnam or Fiji, humidity causes plastic dial covers to fog. A dry dial brass meter solves that. The magnetic drive keeps the mechanical register separate from the water chamber. That design gives a clear reading even with slight sediment.
Pulse Output and Remote Reading
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Installation Notes for DN20 Submeters
Install the meter with the dial facing up or sideways. Avoid installing it with the dial facing down. Use isolation valves upstream and downstream for easy replacement. Keep the pipe full during operation. For multi-jet meters, a short straight run of 3 times the pipe diameter upstream is enough in most residential lines. For piston or rotary type meters, straight pipe is less critical. Flush the pipe before installing the meter. Construction debris and PVC shavings will damage the internal chamber. In cold areas, install a drain point so the meter body does not freeze and split.
Common Problems and How to Fix Them
Air in the pipe can cause the meter to read high. Bleed the line at the highest point. Sediment can slow the impeller or piston. Install a strainer upstream if the water comes from a bore or tank. A dry dial that fogs means the seal has broken. Replace the meter. Pulse signal loss usually comes from wrong wiring distance or cable thickness. Check the pulse output type before running long cables. Silver Instruments can supply an active pulse output version for runs over 50 metres.
FAQ
Q1: Is a 3/4 inch flow meter the same as DN20?
Yes. A 3/4 inch nominal bore equals DN20. Confirm the thread standard because BSP and NPT are not interchangeable.
Q2: Can this meter measure hot water?
The standard brass submeter is rated for cold water up to 50 °C. A hot water version with brass body and high temperature internals is available up to 90 °C.
Q3: What is the minimum flow this meter can detect?
Typical starting flow is around 30 to 50 litres per hour depending on the meter class and orientation. For very low flows, choose a Class B or R100 meter.
Q4: Can I get pulse output and a local dial?
Yes. Most 3/4 inch brass submeters have a mechanical register and a pulse reed switch or Hall sensor. You get local reading and remote data at the same time.
Q5: What information do you need for a quotation?
Send your pipe size in DN, flow range in cubic metres per hour or gallons per minute, pressure in bar, temperature in °C, and the pulse output requirement if any.
Get a Quotation from Silver Instruments
Tell us your pipe size (DN20 or 3/4 inch), flow range in m³/h or gpm, pressure in bar, temperature in °C, and pulse output type. We answer with a model, price, lead time, and freight options to your city. Distributors in Africa and the Middle East often order the 3/4 inch brass flow meter in 20 unit export cartons. Each carton includes tail pieces, gaskets, and spare seals. Contact Silver Instruments by Tel at +86-25-68650347, WhatsApp at +86-25-52155837, or WeChat at +86 15365082610. You can also visit the Silver Instruments website for product data sheets and dimensional drawings.