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Hedland Flow Meter Catalog PDF Download: Comprehensive Mechanical Variable Area Sizing Guide
Quick Answer: The Hedland flow meter catalog PDF gives complete sizing data for mechanical variable area flow meters. You need pipe size DN, flow range, fluid viscosity, pressure bar, and temperature °C to select the correct model. Silver Automation Instruments can send the catalog and a compatible meter quote within 24 hours.
Hedland mechanical variable area flow meters are installed in hydraulic power units, lubrication skids, cooling water lines, and compressed air systems. The catalog covers 1/4 inch to 3 inch ports in NPT, SAE, and BSPP threads. Flow ranges start near 0.02 GPM for oil and go up to 150 GPM. Air ranges reach 600 SCFM on specific models. This guide shows what to check before you download the Hedland flow meter catalog PDF and how to avoid an undersized or oversized meter.
What Is a Hedland Mechanical Variable Area Flow Meter?
A Hedland mechanical variable area flow meter uses a sharp-edged orifice, a tapered metering cone, and a spring-loaded piston. The piston moves when flow passes through the meter. A calibrated scale shows the flow rate directly on the housing. The meter does not need external power for local indication.
Typical fluids include mineral oil, water-glycol, phosphate ester, diesel, air, and nitrogen. The design works in dirty hydraulic environments but solids and jamming are still a concern. Install a filter upstream when particles exceed 200 micron. Most users install these meters horizontally, but some models allow vertical flow if the flow path stays correct.
Key Sections to Check in the Hedland Catalog PDF
Do not skip the pressure drop curves. Most users look only at the flow range table and port size. Pressure drop changes the system curve and can add heat in a hydraulic return line. Match the pressure drop at your normal flow rate, not just at maximum flow.
The viscosity correction chart is also critical. Hedland mechanical variable area meters are calibrated for a reference viscosity, often 30 cSt for oil. A meter sized for 30 cSt oil will read low on 10 cSt oil and high on 100 cSt oil. Give your supplier the actual viscosity at working temperature in cSt.
Check the pressure and temperature limits. Aluminum bodies often reach 3000 psi depending on size. Stainless steel versions can reach 6000 psi and 240 °C in some catalog lines. The clear polysulfone tube on direct reading models has a lower temperature limit than the metal body. Confirm both values before ordering.
Sizing a Hedland Mechanical Variable Area Flow Meter in 6 Steps
Step one. Write down the pipe size and the meter size separately. A DN25 pipe does not automatically need a DN25 flow meter. You can use a DN15 or DN20 meter on a DN25 line if the flow range fits. The meter body is a restriction, so line size and meter size can differ.
Step two. Define normal and maximum flow rate in real units such as L/min, GPM, or SCFM. Do not state full scale only. A meter that goes to 20 L/min is not ideal when normal flow is 3 L/min. The readable zone is usually 20 percent to 80 percent of the full range.
Step three. Specify the fluid. Oil, water, air, and phosphate ester have different density and viscosity. A meter calibrated for oil will not read correctly on water without a correction factor. The catalog lists separate oil and air tables. For other fluids, contact Silver Automation Instruments with specific gravity and viscosity.
Step four. State pressure and temperature in bar or psi and °C or °F. A 10 bar cooling water line is simple. A 350 bar hydraulic system needs stainless steel or high pressure aluminum with suitable seals.
Step five. Choose the process connection. NPT threads appear in North America and some Asian oil and gas sites. BSPP and BSPT threads are common in Southeast Asia, Australia, and the Middle East. SAE straight thread O-ring boss fittings are frequent on mobile hydraulic equipment. Not every model supports every thread type.
Step six. Check pressure drop and viscosity correction together. The piston and orifice method changes with viscosity. At higher viscosity the pressure drop rises. Here is the thing: a meter may indicate higher flow than actual if the correction chart is ignored. Check both values before you re
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Hedland Catalog PDF Download and What You Get
The full Hedland flow meter catalog PDF download includes dimensional drawings, model number selection tables, flow range charts, pressure drop curves, material compatibility data, installation notes, and optional accessories. Short brochures will not include part number details. Ask for the full catalog instead.
Silver Automation Instruments can send the Hedland flow meter catalog PDF download package and a competitive quote for a compatible mechanical variable area flow meter. Send us your pipe size DN, flow range, fluid type, pressure bar, and temperature °C. We will reply with the model number, price, and delivery time.
Contact our team at Tel: +86-25-68650347 or WhatsApp: +86-25-52155837. For WeChat inquiries add +86 15365082610. We serve customers in Vietnam, Indonesia, Australia, UAE, Saudi Arabia, Mexico, and Nigeria.
Common Sizing Mistakes We See on Customer Sites
One common mistake is ordering a flow range that is too wide. A meter with a 5 to 50 GPM scale will not show a 1 GPM leak clearly. If the range exceeds 10 to 1, split the duty into two meters. Another mistake is ignoring fluid viscosity in hydraulic systems. Hydraulic oil behaves differently at 15 cSt and 50 °C than at 10 cSt and 65 °C.
Installation location also causes errors. Hedland mechanical variable area flow meters need straight pipe upstream and downstream to keep the reading stable. The catalog recommends 10 diameters upstream and 5 diameters downstream for most sizes. In practice you can reduce this on return lines but not directly after a throttled valve.
We have seen a paint manufacturer in Vietnam install a direct reading variable area flow meter on solvent with no viscosity correction. The reading was 18 percent high until we recalculated the scale using the specific gravity. A simple correction saved the batch and avoided a second meter.
Recommended Models from Silver Instruments
For water and light oil from DN15 to DN50, Silver Automation Instruments recommends the SIL-VA-150 series with brass or SS316 body and direct reading scale. Flow ranges cover 0.5 to 100 L/min. For hydraulic oil up to 350 bar, the SIL-VA-H400 series uses stainless steel housing and a magnetic indicator. For compressed air and nitrogen, the SIL-VA-A200 series covers 5 to 600 SCFM and offers an optional 4-20 mA transmitter.
If you need a Hedland equivalent, we map the Hedland model number to a compatible variable area flow meter. We check port size, flow range, pressure rating, and viscosity correction. This works well when you have an existing installation and need a drop in replacement.
FAQ
Q: Can I download the full Hedland flow meter catalog PDF from Silver Automation Instruments?
A: Yes. Send us a WhatsApp message or email with your name and company. We will send the full catalog and sizing guide PDF. We do not charge for the catalog.
Q: How do I choose the correct Hedland mechanical variable area flow meter for diesel?
A: Send pipe size, normal and maximum flow rate in L/min or GPM, operating pressure, and viscosity at working temperature. Diesel at 20 °C has a viscosity near 4 cSt. We will recalculate the scale because the standard oil calibration is often 30 cSt.
Q: What is the difference between a direct reading Hedland flow meter and a remote display variable area flow meter?
A: Direct reading models show flow on a scale attached to the meter body. Remote display models use a magnetic follower or a 4-20 mA transmitter to send the flow signal to a control panel. Remote display is safer for high pressure and high temperature lines.
Q: Can a Hedland variable area flow meter work with water?
A: Yes but the scale must be corrected for water if the meter was calibrated for oil. Water has different density and viscosity. We often recommend a water calibrated scale or a different measuring principle for better accuracy in water lines.
Q: What information do I need to get a quote?
A: Send pipe size DN, fluid name, flow range in L/min or GPM, pressure bar or psi, temperature °C, thread type, and whether you need a local scale or a transmitter. We will return a model number, price, and delivery time from Silver Automation Instruments.
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