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High Pressure Hydraulic Flow Meter: Heavy Duty Oil System Fluid Power Testers
Quick Answer: Silver Instruments supplies high pressure hydraulic flow meters for heavy duty oil system fluid power testers. Standard models cover 0.5 to 150 L/min at working pressures up to 420 bar. Outputs include pulse, 4-20 mA HART, and Modbus RTU.
These meters are built for hydraulic oil service, not water. The body uses ductile iron or stainless steel. Seals are Viton or FKM. Ports are BSPP or SAE. In practice, most test bench problems come from wrong viscosity compensation or air trapped in the gear chamber.
What This Flow Meter Does in a Hydraulic Test Bench
You connect the meter in series between the pump outlet and the directional valve. The meter reads live flow, temperature, and often pressure. Technicians use this data to verify pump wear, valve leakage, and motor performance.
A hydraulic pump can lose 10 to 15 percent of its flow before the failure becomes obvious. But a high pressure hydraulic flow meter shows the drop during a loaded cycle, not just at idle. We have seen this on customer sites many times.
Pressure Rating and Oil Compatibility
Choose a meter body rated for your maximum test pressure plus a safety margin. Standard Silver Instruments high pressure hydraulic flow meters are rated at 420 bar. A 700 bar option is available for mining and offshore crane test benches.
Oil viscosity matters. Most hydraulic test benches run ISO VG 32, VG 46, or VG 68. At 40 °C, these oils have kinematic viscosity from 32 to 68 cSt. The meter calibration must match that range. For high viscosity oil above 100 cP, specify a larger clearance gear set. Tell us the oil type and operating temperature when you request a quote.
Flow Range and Accuracy Details
Sizing is simple. So match the meter flow range to your test bench pump. Common sizes are DN10, DN15, and DN25. DN10 covers 0.5 to 30 L/min. DN15 covers 1 to 60 L/min. DN25 covers 5 to 150 L/min.
Accuracy is plus or minus 0.5 percent of reading for oil in the calibrated range. Repeatability is better than plus or minus 0.1 percent. For field service kits, the display shows L/min, total liters, and temperature in degrees C. A PT100 sensor can be built into the meter body.
Heavy Duty Oil System Fluid Power Testers in the Field
Heavy duty oil system fluid power testers are used on hydraulic power units, winches, steering systems, and mobile equipment. We supply customers in Southeast Asia, Australia, the Middle East, and Latin America.
Last year a customer in Vietnam asked us for a portable meter to test hydraulic winches on fishing vessels. His test bench ran at 380 bar with ISO VG 68 oil at
Installation, Ports, and Signal Output
Use BSPP or SAE ports. For DN15, common threads are 1/2 inch BSPP or 3/4 inch SAE. Mount the meter with the flow direction arrow aligned with pump flow. Keep at least 10 pipe diameters of straight run before the meter and 5 after if space allows.
Because air in oil causes false low readings, bleed the system at the highest point before you start the test. A totalizer with a flow rate display is enough for basic troubleshooting. For data logging, request 4-20 mA HART or Modbus RTU. ATEX Zone 1 certification is available for offshore and mining service.
Why Silver Instruments
Here is the thing. A low cost meter with poor viscosity compensation will drift after 50 °C. Silver Automation Instruments builds the meter body, gear set, and electronics in house. We calibrate each high pressure hydraulic flow meter with oil at 40 °C. You get a calibration certificate with serial number and test points.
We are not a trading company. Our factory in Nanjing handles pressure testing, signal output testing, and customer specific labeling. We keep common DN15 and DN25 meters in stock for fast delivery to Australia and Southeast Asia. For hydraulic oil we quote in L/min. If you need mass flow in kg/h, ask for a Coriolis meter instead.
Send us your pressure in bar, temperature in degrees C, pipe size in DN, and flow range in L/min. We will reply with a quote within 24 hours on weekdays.
Tel: +86-135-1213-1526
Whatsapp: 86-135-12131526
WeChat: +86 13512131526
Website: flow-meter.com.au
FAQ
What pressure can this meter handle?
Standard models are rated at 420 bar. A 700 bar option is available for extreme test benches.
Can this meter measure hydraulic oil at high temperature?
Standard seals handle oil at 120 °C. High temperature Viton seals allow 180 °C. Tell us your oil temperature before ordering.
Does this high pressure hydraulic flow meter work with water glycol fluids?
Yes. We select materials and seals for HFC and HFD fluids. Do not assume standard seals work with fire resistant fluids. Tell us the fluid type and water content before ordering.
What outputs are available?
Pulse, 4-20 mA HART, and Modbus RTU are standard. A local display with totalizer is optional.
What information do you need for a quote?
Send us pressure in bar, temperature in degrees C, pipe size in DN, flow range in L/min, oil type, and output signal.
Visit flow-meter.com.au for the full high pressure hydraulic flow meter range.
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