『Harris Flow Meter Replacement Parts Directory: Sourcing Needle Valves, Knobs, and Inner Thorpe Tubes』Related information(flow rotameter|digital flow meter|balo meter|hydraulic flow meter|volumetric meter|positive displacement meter|pitot tube flow meter|displacement meter|cfm meter|variable area flow meter|inline flow meter|differential pressure flow meter|calibrated flow meter|velocity meter|paddle wheel flow meter|oval gear flow meter|anemometer hvac|multiphase flow meter|doppler flow meter|thorpe tube flowmeter|heat flow meter)
Harris Flow Meter Replacement Parts Directory: Sourcing Needle Valves, Knobs, and Inner Thorpe Tubes
Quick Answer: Silver Automation Instruments supplies replacement needle valves, knobs, and inner Thorpe tubes for common Harris flow meter models including 25G, 301, 355, and 601. The parts suit gas distribution, welding, laboratory gas, and light industrial applications. Send your Harris model number, gas type, pressure, and flow range for a quote with lead time.
Harris flow meters appear in gas panels, welding carts, purging stations, and laboratory bench setups. Many users in Southeast Asia and the Middle East keep these units running for years. When a knob cracks or a Thorpe tube stains, the meter body may still be in good condition. Replacement often costs less than a full new flow meter.
Silver Automation Instruments holds a sourcing directory for these parts. We do not claim to be the OEM for Harris. We supply compatible industrial parts with clear material specs and thread sizes. Each batch is checked against common Harris meter dimensions before dispatch.
Needle Valves for Harris Flow Meters
The needle valve controls fine gas flow. On many Harris flow meters the valve stem wears before the body. We supply replacement needle valves in brass and 316 stainless steel. The stainless option suits corrosive gases and humid plants. Brass suits argon, nitrogen, and carbon dioxide in dry environments.
Typical inlet and outlet threads are 1/8 inch NPT and 1/4 inch NPT. Some older Harris models use 1/4 inch SAE flare connections. Verify this before ordering. A customer in Vietnam replaced five needle valves on Harris 355 flow meters last year. He sent us photos of the old valve stems plus the gas type. We matched the thread and seal material in two days.
Ask for the packing material as well. PTFE packing works with most industrial gases. For high purity oxygen service specify cleaned parts. Mention oxygen cleaning in your inquiry because this changes the assembly process.
Knobs for Harris Flow Meter Replacement
Knobs fail in the field. Operators overtighten them. Plastic knobs crack. Metal knobs strip. The meter still works but the adjustment becomes difficult.
Silver Instruments offers round knurled knobs and bar style knobs. Materials include black phenolic, nylon, and anodized aluminum. The bore size must match the valve stem. Common bore sizes are 4 mm, 4.8 mm, and 6 mm. We can supply a set screw or spring clip depending on the Harris model.
One food packaging plant in the Philippines ordered 30 black phenolic knobs for Harris 301 flow meters. The line used carbon dioxide for modified atmosphere packaging. They wanted a simple mechanical fit without changing the valve body. The replacement took ten minutes per meter.
Inner Thorpe Tubes for Harris Flow Meters
The inner Thorpe tube is the glass metering tube inside the outer polycarbonate shield. It carries the float. Over time the glass gets cloudy. Some tubes crack during cleaning. The float may stick if the tube bore is scratched.
We source inner Thorpe tubes for low flow gas ranges. Common range
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Tube lengths matter. Many Harris inner Thorpe tubes fall between 120 mm and 150 mm. The top and bottom fittings may be o-ring sealed or packless. Supply the meter model and the float material. Glass floats and stainless steel floats read differently. A laboratory in Chile ordered inner Thorpe tubes for Harris 601 flow meters used in gas chromatography. We asked for gas, pressure, and float type. The new tubes arrived with calibration graphs.
In practice most engineers skip the calibration graph. They install the tube and check flow against a downstream mass flow meter. But for audited labs the graph helps.
How to Specify a Replacement Part
Send us the Harris model number. Add the gas type, pressure in psi or bar, and flow range in L/min or SCFH. Photos of the old part help. Include the thread size if you know it. For Thorpe tubes include the float material and tube length.
Because we ship to Southeast Asia, Oceania, Latin America, Africa, and the Middle East, packaging matters. Each Thorpe tube is wrapped in foam and shipped in a rigid cardboard tube. Needle valves and knobs go into labeled poly bags. We ship by DHL, FedEx, or sea freight for bulk orders.
Silver Automation Instruments also supplies full flow meters for gas and liquid. We carry electromagnetic flow meters, oval gear flow meters, thermal mass flow meters, and pressure transmitters. If the Harris meter body has failed beyond repair, we can propose a replacement flow meter with a similar gas range.
FAQ
Do you sell original Harris replacement parts?
No. We supply compatible industrial replacement parts. Material specs and dimensions are verified against common Harris flow meter models. We do not use the Harris logo on any part.
How do I know the correct Thorpe tube range for my gas?
Give us your gas type, pressure, and current flow range. We match the tube bore and float weight. For example a 0.5 to 5.0 L/min air tube will not read the same with carbon dioxide.
What thread sizes do your Harris needle valves cover?
Most replacements cover 1/8 inch NPT, 1/4 inch NPT, and 1/4 inch SAE flare. Send a photo if your meter has a non standard fitting.
Can you supply knobs for old Harris flow meter models?
Yes. We keep drawings for many older models. Bore size and stem shape are the key details. We also machine simple aluminum knobs for low volume special orders.
What is the typical lead time for replacement parts?
Stocked needle valves and knobs ship in 3 to 5 working days. Inner Thorpe tubes take 5 to 10 working days after you confirm the gas and flow range. Bulk orders over 100 pieces move by sea freight and need 15 to 25 days.
Contact Silver Automation Instruments for a quote. Tel: +86-25-68650347. Whatsapp: +86-25-52155837. WeChat: +86 15365082610. Send us your Harris model number, gas type, pressure in psi or bar, and flow range in L/min or SCFH.
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