Models, Ultimate Vacuum and Flow
All vacuum values are gauge pressure. Absolute pressure equals ambient pressure minus the gauge reading. At sea level (101.3 kPa ambient), −90 kPa gauge corresponds to roughly 11 kPa absolute. Confusing the two scales is a common way to undersize a pump.
|
Model |
Ultimate vacuum |
Free flow |
Rated voltage |
Power |
Noise at 1 m |
|
07V-A |
−90 kPa / −675 mmHg |
5 L/min |
7 V DC |
6 W |
≤ 58 dB(A) |
|
07V-B |
−85 kPa / −638 mmHg |
8 L/min |
7 V DC |
8 W |
≤ 60 dB(A) |
|
07V-C |
−92 kPa / −690 mmHg |
4 L/min |
7 V DC |
5 W |
≤ 55 dB(A) |
Test conditions: 23 ± 2 °C, 101.3 kPa ambient, rated voltage ±5 %, new piston seal and valves, unrestricted inlet. Published figures apply only under these conditions.
No single model offers both the deepest vacuum and the highest flow. The 07V-A and 07V-C trade flow for depth; the 07V-B does the opposite. Select according to the actual operating point of the system, not the largest number on the data sheet.
Flow versus Vacuum
Free-air flow only describes the pump with nothing attached. As inlet vacuum rises, delivered flow falls steadily until it reaches zero at ultimate vacuum. Typical values at working vacuum are shown below (±10 %).
|
Gauge vacuum |
07V-A (L/min) |
07V-B (L/min) |
07V-C (L/min) |
|
Free air |
5.0 |
8.0 |
4.0 |
|
−20 kPa |
4.2 |
6.6 |
3.4 |
|
−40 kPa |
3.4 |
5.2 |
2.8 |
|
−60 kPa |
2.5 |
3.4 |
2.2 |
|
−80 kPa |
1.1 |
0.9 |
1.3 |
Two practical rules help keep the selection safe: keep working flow at or below 60 % of the pump's delivery at that vacuum, and keep the target vacuum at least 12 kPa above the ultimate figure. A sampling line that needs 1.5 L/min at −60 kPa sits at the edge of comfortable for the 07V-A (2.5 L/min). The 07V-B still delivers 3.4 L/min at the same point, dropping the load to roughly 44 %.
Pump-Down Time and Vacuum Hold
In a sealed 1 L chamber the 07V-A typically reaches −70 kPa in 15–20 seconds and −85 kPa in 40–50 seconds under the stated test conditions. The final 15 kPa takes more than twice as long as the first 70 kPa because the pump is working far out on the flow curve.
Once the inlet is closed, vacuum drift is governed by external leak rate and chamber volume. With a leak of 0.1 kPa·L/min, a 1 L volume loses about 3 kPa in 30 minutes; a 2 L volume loses about 1.5 kPa. Higher leak rates quickly overwhelm even a strong pump. When vacuum continues to fall after the pump is isolated, the first measurement to take is the leak rate of the finished assembly.
Factors That Change Performance in a Real System
|
Factor |
Typical effect |
Practical response |
|
Altitude |
Gauge vacuum drops ≈11–12 kPa per 1,000 m |
Specify against absolute pressure |
|
Gas temperature |
25–30 °C rise softens vacuum 2–4 kPa and accelerates seal wear |
Cool or pre-condition the sample |
|
Tubing |
>0.8 m length or <4 mm ID can cut effective flow 25–40 % |
Shorten lines, increase ID, reduce fittings |
|
Supply voltage |
10 % below nominal reduces free flow 10–15 % and ultimate vacuum 4–6 kPa |
Regulate voltage under load |
At 1,000 m (ambient ≈90 kPa) the 07V-A still reaches about 11 kPa absolute, which now reads only −79 kPa gauge. The pump has not changed; the reference pressure has. Portable instruments that pass bench tests with short tubing often lose performance once the final enclosure routes 700 mm of 3 mm tube through a manifold. Measure the finished assembly before freezing the pump choice.
application
|
Application |
Typical working vacuum |
Free-flow range needed |
Usual starting point |
|
Portable sampling / instruments |
−70 to −90 kPa |
4–7 L/min |
07V-A or 07V-C (low noise) |
|
Environmental gas sampling |
−60 to −85 kPa |
6–10 L/min |
07V-B or dual-head custom |
|
Lab vacuum filtration |
−80 to −92 kPa |
3–6 L/min |
07V-C |
|
Compact pick-and-place |
−50 to −75 kPa |
7–12 L/min |
07V-B or dual-head custom |
When the pump forms part of a regulated medical device, device-level approval, risk management and biocompatibility remain the responsibility of the OEM. Material declarations are supplied to support that process.
Maintenance and Troubleshooting
Clean or replace the inlet filter every 400–800 hours according to dust load. Inspect tubing and fittings quarterly. Confirm mounting hardware and vibration isolators remain tight. Keep ambient temperature and humidity inside the rated window; condensation accelerates seal wear.
Replace the piston seal when free flow has dropped more than 15 %, ultimate vacuum has fallen more than 5 kPa, or the pumping rhythm becomes uneven. Inspect the valves at every seal change. Typical continuous-duty life is 4,000–7,000 hours.
|
Symptom |
Likely cause |
First checks |
Likely parts |
|
Vacuum falls over time |
External leak, worn seal, low voltage |
Soap-test fittings, measure voltage under load, inspect seal |
Seal and valves |
|
Flow too low |
Restricted tubing, clogged filter, aged seal |
Clear lines, clean filter, free-flow test |
Filter or seal |
|
Noise rises |
Loose mounts, bearing wear, foreign matter |
Tighten hardware, listen for progressive noise |
Motor if persistent |
|
Overheating |
High ambient, overload, blocked cooling |
Improve ventilation, reduce load |
None at first |
|
Does not start |
Wrong polarity, driver fault, seized piston |
Confirm polarity and voltage, turn piston by hand |
Driver or complete unit |
Before long-term storage, drain any condensate, cap the ports and keep the pump dry between 0 °C and 40 °C. After more than six months idle, run unloaded for 10–15 minutes before applying load. Never apply side load to the ports.
Quality and Customisation
Piston assemblies, motor winding, assembly and final testing are performed in the same facility. Incoming inspection, in-process SPC and 100 % vacuum-and-flow testing are standard. CE and RoHS compliance are current; full material declarations including REACH SVHC are available on request.
Voltage, flow/vacuum targets, port style, seal compound, labelling and packaging can be adjusted. Oil-free configurations are available when required-confirm at the quotation stage. Sample lead time is typically 7–15 days; production lead time after sample approval is 25–35 days. Standard models can be ordered in smaller quantities; custom versions carry a higher minimum order quantity.
Engineers support selection directly, including review of tubing layout, supply voltage and duty cycle. Customers are supplied across Europe, North America and Asia.
FAQ
Q: What vacuum can the 07V reach?
A: −85 to −92 kPa gauge at sea level (−90 kPa on the 07V-A, −85 kPa on the 07V-B, −92 kPa on the 07V-C). Deeper vacuum normally requires a multi-stage design or a different technology. At altitude the gauge reading is lower for the same absolute pressure.
Q: How do I estimate pump-down time?
A: Use t ≈ (V / S) × ln(P₀ / P) with absolute pressures and average effective speed, then add 30–50 % for tubing, temperature and small leaks. Confirm with a prototype.
Q: Why does vacuum drop over time?
A: External leaks are the most common cause, followed by seal or valve wear and supply voltage sag under load. Isolate the system and measure leak rate before suspecting the pump.
Q: How long does the pump last?
A: Motor life is typically 8,000–10,000 hours. The piston seal is the normal wear item at 4,000–7,000 hours of continuous duty. Replace when free flow has dropped >15 % or ultimate vacuum has fallen >5 kPa.
Q: Can it run continuously?
A: Yes, within 5–40 °C ambient, clean dry gas, free cooling airflow, and a working point at or below 60 % of available flow at that vacuum. Continuous overload and blocked cooling shorten seal life most rapidly.
Hot Tags: 07V Miniature Piston Pump, China 07V Miniature Piston Pump manufacturers, suppliers, factory, synthetic vacuum pump oil, super air pump double quick volume, 24v vacuum pump, pompa portable mini, used vacuum pumps, vacuum pump oil price
