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Oxygen Regulator with Flow Meter: Patient Cylinder Medical Gas Delivery Kits
Quick Answer: An oxygen regulator with flow meter for patient cylinders controls delivery pressure from 0 to 200 bar down to a safe 0.5 to 15 L/min or higher. These medical gas delivery kits combine a brass or aluminum regulator body, a clear flow tube, a DISS or pin-index yoke connection, and a barbed outlet for a nasal cannula. Silver Automation Instruments supplies pre assembled and tested kits that match ISO 10524 and CGA V 1 standards for clinics in Southeast Asia, Africa, and the Middle East.
Oxygen delivery for a single patient starts with a cylinder, a regulator, a flow meter, and a tube. We see many small hospitals and home care providers in Indonesia, Kenya, and Peru make a mistake here. They buy a regulator without a flow meter or a flow meter that does not fit the cylinder valve. Then the oxygen flow to the patient is wrong. The doctor prescribes 2 L/min and the patient gets 1.5 L/min because the float inside the flow tube sticks. That leads to low SpO2 levels and a call back to the supplier.
Our medical gas delivery kit solves that problem. Each kit includes an oxygen pressure regulator, a Thorpe tube flow meter with a clear polycarbonate cover, a humidifier bottle adapter if needed, and an outlet barb. The regulator body is made from forged brass with a nickel plated finish or from anodized aluminum if weight is a factor. The inlet connection fits the cylinder valve standard in your country. For Australia and New Zealand we supply a pin index yoke for AS 2472. For the Middle East and parts of Africa we supply a BS 341 No. 3 yoke or a DIN 477 No. 9 bullnose connection. For the USA and PH market we match CGA 540 or CGA 870. We do not guess the connection. We ask the customer to send a photo of the cylinder valve and a drawing with thread details.
Flow Meter Design That Works in Humid Clinics
The flow meter inside these kits is a variable area type with a glass or polycarbonate tube, a stainless steel float, and a graduated dual scale. The scale usually shows 0 to 15 L/min on one side and 0 to 5 L/min on the other for paediatric use. The needle valve adjusts flow smoothly from 0.1 L/min up to the maximum range. A common fault in low cost kits is the needle valve seat made from soft plastic that swells in humid air. In a clinic in Lagos with 85% relative humidity, a cheap regulator can fail in three months. We specify a brass needle valve with a PTFE seat that does not absorb moisture. The flow stays accurate within plus or minus 10% of full scale, tested with dry medical oxygen at 21 °C and 50 bar inlet pressure.
We also add a sintered bronze inlet filter to each regulator. The filter traps particles down to 40 microns that come from cylinder filling stations in remote areas. A blocked filter reduces flow, so we tell customers to check it during monthly maintenance. The filter can be removed and cleaned with a dry cloth.
Pressure Relief and Safety Features
Every medical oxygen regulator needs a pressure relief device. Our kits have a built in safety relief valve on the low pressure side that vents gas if pressure exceeds 3 bar to 4 bar. That protects the flow meter tube and the humidifier bottle from over pressurisation. The high pressure gauge displays cylinder content from 0 to 315 bar or 0 to 4500 psi depending on the market. Silver Instruments uses glycerine filled gauges where the user wants to reduce needle fluctuation during ambulance transport. A dry gauge is standard for stationary ward use.
The Cv of the regulator seat is sized to maintain a stable outlet pressure even when cylinder pressure drops from 200 bar to 10 bar. In practice, that means the flow meter stays within its accuracy band for 90% of the cylinder life. A nurse does not need to adjust the needle valve every hour. Good regulator design keeps the droop below 10% across the full inlet pressure range.
Kit Assembly and Testing for Export Orders
Silver Automation Instruments does not send loose parts to a distributor in Durban or Manila and hope they fit. We assemble each
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Packaging matters for sea freight. We use a moulded EVA foam insert that holds the regulator and flow meter in place inside a double wall corrugated box. The box is sized to fit 12 kits per export carton for a 20 ft container or LCL shipment. The individual box also works for courier delivery via DHL or FedEx for small orders of 5 to 10 kits. We ship to Singapore, Dar es Salaam, and Panama City regularly with full documentation including a Certificate of Conformance, a test report, and a packing list.
Common Configurations We Supply
Most orders fit one of four profiles.
Profile A: Pin index yoke (ISO 407) for oxygen, flow range 0 to 5 L/min paediatric, with a barbed outlet and no humidifier bottle. Popular in maternity wards and neonatal care in Bangladesh and Myanmar.
Profile B: BS 341 yoke for oxygen, flow range 0 to 15 L/min, with a 1/4 inch hose barb and a DISS 1240 humidifier port. This kit goes to government hospitals in Ghana and Zambia where they use bubble humidifiers.
Profile C: DIN 477 No. 9 bullnose inlet, flow range 0 to 25 L/min high flow, with a 9/16 inch - 18 UNF outlet for a Venturi mask. These are used in ambulances and emergency departments in Saudi Arabia and the UAE.
Profile D: CGA 540 connection, flow range 0 to 8 L/min, with a dual outlet for two patients simultaneously. This is a request we get from large clinics in Peru and Colombia that want to run two nasal cannulas from one D or E size cylinder.
If your application does not match any profile, we can mix and match. Send us your cylinder connection standard, flow range, outlet fitting type, and whether you need a humidifier bottle adapter. We will quote a kit with a part number within 24 hours. Email us at [email protected] or call our office at +86-135-1213-1526.
FAQ on Medical Oxygen Regulator Kits
Can I use an industrial oxygen regulator for a patient?
No. A medical regulator must be cleaned for oxygen service and assembled in a cleanroom to prevent hydrocarbon contamination. Industrial regulators may contain oils that can ignite in pure oxygen at high pressure. Always use a regulator marked for medical O2 service and tested to ISO 15001.
How often should the flow meter be recalibrated?
For a clinic in a stable environment, check flow accuracy once a year against a calibrated reference flow meter. If the kit is used in a mobile ambulance or in a dusty environment, check every 6 months. The float and tube can accumulate dust that changes the reading.
What is the minimum order quantity for a custom kit?
Our minimum batch for a custom inlet connection and flow range is 50 kits. For standard configurations we ship from stock down to 1 kit for evaluation. You can reach our sales team on WhatsApp: 86-135-12131526 or WeChat: +86 13512131526 to check stock.
How do I order spare parts like a replacement flow tube?
Quote the serial number on the regulator label. We keep flow tubes, O rings, gauges, and filter elements in stock for all serial numbers shipped in the last 5 years. Order via email with a photo of the damaged part and the serial number.
What is the delivery time for 200 kits to a hospital in Dar es Salaam?
Assembly and testing of 200 standard kits takes 7 working days. Sea freight from Shanghai to Dar es Salaam port takes about 28 days via carrier MSC. Door to door delivery with a local clearing agent takes an additional 5 days. We handle the export documentation in house.
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