hydraulic oil flow meter 4 inch

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Hydraulic Oil Flow Meter 4 Inch: Rugged Volumetric Measurement for Oil Circuits

Quick Answer: A 4-inch hydraulic oil flow meter handles high-viscosity mineral oils, synthetic esters, and hydraulic fluids in heavy equipment and power units. Silver Automation Instruments supplies oval gear and turbine flow meters with 4-inch (DN100) flanges, pressure ratings up to 400 bar, and temperature from -20 °C to 150 °C. Send us your oil viscosity (cP), operating pressure (bar), pipe size, and flow range to receive a technical proposal.

Hydraulic Oil Flow Measurement Challenges

Hydraulic oil is sticky. Viscosity swings with temperature. A 4-inch line in a hydraulic press may carry 200 to 2000 liters per minute. Differential pressure devices often fail because they cannot handle the non-Newtonian behavior. So you need a positive displacement flow meter or a turbine meter that works with viscous media. We have seen this in service centers in Vietnam and Saudi Arabia. A hydraulic hose test bench in Thailand used a generic flow meter that gave erratic readings above 80 °C. They switched to a Silver Instruments oval gear meter and the data became stable within one day.

Recommended Meter Types for 4-Inch Hydraulic Oil Lines

For most hydraulic oil applications we recommend an oval gear flow meter. It captures volume directly. Accuracy reaches ±0.5% of reading. Our SOG-100 series (4-inch / DN100, cast iron or stainless steel) works with viscosity up to 1000 cP and flow range 100 to 2000 L/min. The meter includes a built-in PT100 for temperature compensation. Output is 4-20 mA HART or pulse. You can connect it to a paperless recorder or PLC.

A turbine flow meter is another option if the oil is clean and viscosity stays below 100 cP. Our STF-100 model uses a tungsten carbide bearing and handles 4-inch lines up to 120 °C. But for dirty hydraulic fluids with metal particles, the oval gear meter lasts longer. In practice, most maintenance teams prefer the robust, low-maintenance oval gear design.

Key Specifications to Specify

When you request a 4-inch hydraulic oil flow meter, give us the real process data. Four values decide the right model: maximum working pressure (bar), fluid temperature range, oil viscosity at operating temperature (cP or mm²/s), and minimum to maximum flow rate (L/min). Our team sizes the meter body, bearing material, and seal type accordingly. For example, a hydraulic power unit in West Africa needed a meter rated 250 bar, with FKM seals, and ATEX Zone 2 certification. We built the SOG-100 with 316L housing and an E

x d junction box. It has been running for 14 months without drift.

Installation Tips for 4-Inch Meters in Hydraulic Circuits

Mount the meter horizontally with the shaft parallel to the ground. Avoid vertical installation in suction lines because air pockets cause measurement errors. Use a strainer before the meter if the oil carries sludge or metal chips. Do not install the meter near a pulsation source like a piston pump without a dampener. We always include a straight pipe run recommendation of 5 x DN upstream and 3 x DN downstream. In tight spaces, you can reduce it to 3 x DN if the flow is fully developed. A customer in Indonesia followed these steps and improved reading stability by 90 percent compared to their old setup.

FAQ on 4-Inch Hydraulic Oil Flow Meters

Q1: Can the 4-inch flow meter handle fire-resistant hydraulic fluids like HFC or HFD?
Yes. Silver Instruments offers meters with EPDM or FKM seals compatible with phosphate esters and water-glycol fluids. Tell us the fluid type and we select the wetted parts.

Q2: What is the typical accuracy for an oval gear meter on hydraulic oil?
±0.5% of reading from 10% to 100% of full scale. Calibration certificate traceable to ISO/IEC 17025 available if required.

Q3: Do I need a flow computer or can I read the meter directly?
The meter has a mechanical totalizer as standard. You can also get a pulse output or 4-20 mA HART signal to a remote display. No flow computer is required for local reading.

Q4: How do you ship a 4-inch meter to remote sites in Africa or the Pacific?
We pack the meter in a wooden crate with desiccant. We ship by air freight or sea freight via DHL or forwarder. Delivery to Lagos, Port Moresby, or Dammam typically takes 5 to 7 days by air.

Q5: Can I use the same meter for hydraulic oil and diesel with different viscosities?
Yes, but you must specify the viscosity range during ordering. We calibrate the meter for the dominant fluid. If you switch fluids often, ask for a multi-point calibration table.

Get a Quote for Your 4-Inch Hydraulic Oil Flow Meter

Stop guessing flow rates. Send us your pressure (bar), temperature (°C), pipe size (DN), and flow range today. Our application engineers will recommend the correct oval gear or turbine meter with the right material and certification. Email your requirements to [email protected] or fill the request form on our website. You will receive a datasheet and price within 24 hours.

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