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Multi Jet Water Flow Meter: Residential Utility Submetering Volumetric Dial Valves
Quick Answer: Multi jet water flow meters with a volumetric dial valve are the most common mechanical solution for apartment submetering. These meters work without batteries, measure low flows down to 6 liters per hour, and cost less than ultrasonic or electromagnetic options in DN15 and DN20 sizes. Silver Instruments ships these meters to building developers and water utility subcontractors in Melbourne, Jakarta, and Nairobi. Send us your pipe diameter and daily water usage profile and we will return a quotation with a datasheet within 24 hours.
Why Multi Jet Meters Fit Residential Submetering
A multi jet meter uses multiple inlet ports to direct water onto a small impeller. Because the force distributes evenly, the impeller rotates with less friction. The rotation drives a gear train that turns a volumetric dial. This design handles sand particles and pipe scale better than a single jet meter. In residential utility metering, that matters. A small apartment building in Kuala Lumpur may have 50 units, each with a DN15 meter behind a valve. The multi jet meter keeps registering accurately during low night flows when only a toilet cistern refills. Ultrasonic meters do a fine job too but they need a battery that fails after 5 to 8 years in hot climates. Mechanical multi jet meters eliminate that failure point.
Key Technical Specs That Matter for Field Engineers
Most engineers ask us for three numbers: flow range, pressure rating, and connection type. A typical DN15 multi jet residential meter covers Q3=2.5 m3/h with an R80 accuracy ratio, meaning it stays accurate down to 31 liters per hour. The dial displays total volume in m3 with a resolution of 0.0001 m3. The body can be brass or reinforced nylon for cold water up to 50°C. For hot water submetering up to 90°C, we specify a brass body with PTFE internal seals. The standard thread is BSP or NPT as per the local code. In the Middle East, we mostly ship meters with BSP threads and a built in non return valve. The maximum working pressure is usually PN16, which covers most urban water supply networks. A pulse output option is available if you want to connect to a remote reading system. The reed switch generates a dry contact pulse every 10 or 100 liters. We supply prewired cable lengths of 1.5 meters, 3 meters, or 5 meters as per site panel distance.
Volumetric Dial Valves: Reading Without Power
The volumetric dial valve is the readout part that does not need electricity. The dial is sealed inside a hermetically sealed register filled with glycerin to prevent condensation. In humid countries like Indonesia and the Philippines, condensation is the main reason why mechanical registers fog up and become unreadable. Our meters use a dry register design. The magnetic coupling between the impeller gear and the dial pointer eliminates a mechanical shaft seal leak point. This means you can replace the register without cutting the pipe. The valve function is integrated into some models: a small shut off ball valve sits before the meter inlet. The operator turns it with a square key to isolate a unit during renovation or tenant change. We supply these combo valve meter assemblies for three standard layouts: horizontal in line, vertical upflow, and horizontal with the dial facing up. The orientation matters because multi jet meters must stay horizontal to maintain accuracy. The factory calibrates each meter at three flow points: Qmin, Qt, and Qn. The dial pointer alignment is correct to within half a pointer width.
Installation Tips for Southeast Asia and Oceania
Here is something we learned from a project in Fiji. The contractor installed DN20 multi jet meters directly after a pump discharge line. The pulsating flow caused the impeller to bounce and the gears wore out in 18 months. We moved the meter 10 pipe diameters downstream and added a small pressure vessel. The second batch lasted 6 years and still meets accuracy. So always follow the 10D upstream and 5D downstream straight pipe rule for multi jet meters. Another point: in areas with high iron content, like bore water in Western Australia, fit a y strainer before the meter. The small orifices of the multi jet ports can clog with rust flakes. A 40 mesh strainer works. We often p
Real Customer Cases: From Vietnam to Nigeria
Last month, a housing developer in Ho Chi Minh City ordered 500 pieces of DN15 multi jet meters with pulse output. They are installing them in a new build-to-rent complex with centralized cold water supply. They needed a meter that does not trip a low power wireless transmitter. Our reed switch output works with their Sigfox gateway. We preset the cable length to 3 meters and terminated the wires with a weatherproof connector. Shipping took four days by air freight via Tan Son Nhat airport. Another case: a water utility in Kano, Nigeria, asked for a batch of DN20 meters with integrated shut off valves. They service a public housing scheme where tenants change frequently. The ability to turn off water at the meter without shutting the riser saves them two hours of labor per turnover. We added a plastic seal hole on the valve handle to prevent tampering. The order was 200 units. We delivered by sea freight with wooden crates, lead time was three weeks.
FAQ about Multi Jet Water Meters
Q: Can I use a multi jet meter for treated sewage effluent?
A: Treated effluent with particles below 0.5 mm is fine in a multi jet meter. For coarser particles, use a single jet meter or install a fine strainer. The nozzle ports on a multi jet meter typically measure 1.5 mm by 4 mm each. Anything larger can block them.
Q: What is the difference between a volumetric rotary piston meter and a multi jet meter?
A: A rotary piston meter traps a fixed volume of water and measures direct displacement. It is more accurate at very low flows but wears faster in sandy water. A multi jet meter sacrifices a small amount of low flow accuracy for better sand tolerance and lower pressure loss. For most apartment submetering, the multi jet is the preferred choice in Asia Pacific.
Q: How long does a multi jet meter last before recalibration?
A: In clean municipal water with pH between 6.5 and 8.5, expect 8 to 10 years before the accuracy drifts beyond 5%. Many countries mandate a reverification every 5 years for utility billing. We provide a factory recalibration service. Send the meter to our Nanjing workshop and we will test it on an accredited rig and return it with a new certificate and new seals within 10 working days.
Q: Do you supply meters with MID or ISO 4064 certification?
A: Our standard mechanical meters comply with ISO 4064 Class B and R80. We can provide EN 14154 test reports on request. For markets that require WRAS or KIWA approval, contact us with the exact standard. We have previously supplied meters with SIRIM certification for Malaysia and SASO for Saudi Arabia.
Q: What is the minimum order quantity for a custom dial face?
A: We can print your utility logo and barcode on the dial face with a minimum order of 200 pieces per size. The printing uses UV resistant ink. The setup fee is waived if you order 500 pieces or more. Send us your artwork in vector format, and we will return a proof within 48 hours.
How to Order from Silver Instruments
We keep standard DN15 and DN20 multi jet water meters in stock in our Nanjing warehouse. For small quantities under 50 pieces, we ship by DHL or FedEx within 3 working days. Larger orders ship by sea to Australia, Saudi Arabia, or Brazil with a lead time of 15 to 25 days. To get an accurate price, send us your pipe size (DN), typical flow rate range, water quality details, and required approvals. WhatsApp us at 86-135-12131526 or call +86-135-1213-1526 during Asia business hours. Prefer email? Write to [email protected]. Our engineers will help you select the right meter and valve combination. We can also provide a sample unit for evaluation. A customer in Brisbane once tested two meters side by side for three months before placing the bulk order. That is a smart way to build confidence.
Silver Automation Instruments
Email: [email protected]
Tel: +86-135-1213-1526
Whatsapp: 86-135-12131526
WeChat: +86 13512131526
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