VQ Series-single Pumps - Rotary Vane Vacuum Pump

Applications

Based on its technical specifications, this pump is frequently found in the following sectors:

Construction Machinery: It is a standard component for concrete pump trucks, road rollers, paving machines, and cranes.

Agricultural Equipment: Used in tractor hydraulic systems and various types of harvesting machinery.

Material Handling: Frequently installed in forklifts and excavators for lifting and steering functions.

Industrial Mining: Applied in mining machinery and heavy-duty presses that require consistent high-pressure oil delivery.

Waste Management: Often used in the hydraulic systems of dump trucks and concrete mixers.

Q1：What is VQ single pump core structure & maximum working pressure?

A：It adopts intra-vane (10-blade) balanced design, replaceable cartridge kit, floating dual-metal side plates for automatic clearance compensation. Standard max continuous pressure: 21MPa (3000PSI); intermittent peak 24MPa. Main models: 20VQ /25VQ /35VQ /45VQ single pumps.

Q2：What hydraulic oil & viscosity are required for VQ single pumps?

A：Use anti-wear petroleum hydraulic oil (HLP32/46 recommended). Operating viscosity range: 17–37 cSt at working temp (40–55°C). Cold startup minimum ≥10 cSt; max allowable viscosity ≤65 cSt to avoid cavitation. Oil cleanliness: ISO 18/15 or finer, 10μm suction filter mandatory.

Q3：Pump no oil output / cannot suck oil, root causes & fixes?

A

1. Motor rotation reversed → swap 2 motor phases to correct rotation

2. Tank oil level too low, suction pipe exposed to air → refill oil to standard level

3. Suction filter blocked / suction line air leakage → clean filter, replace O-rings at pipe joints

4. Vanes stuck in rotor slots → disassemble cartridge, clean rotor & vanes, match vane clearance 0.015–0.025mm

5. Pump not pre-filled before startup → pour oil into discharge port to prime pump before running

Q4：Low flow & insufficient working pressure, how to troubleshoot?

A

1. Pump cover bolts loose → retighten crosswise to spec torque, control axial clearance 0.02–0.045mm

2. Worn cam ring / side plates / vanes → replace cartridge kit; reversible cam ring (180° flip if lightly worn)

3. Severe internal leakage in system valves/cylinders → test each actuator for external leakage

4. Oversized oil viscosity causing poor filling → warm oil or switch to lower-viscosity hydraulic oil

Q5：Abnormal loud noise & high-pitched whistling during operation?

A

1. Cavitation (suction insufficient air intake) → raise tank oil level, shorten suction pipe, enlarge suction port

2. Air trapped inside pump/system → loosen discharge fitting, run pump idle to bleed all air bubbles

3. Misalignment between pump shaft & motor shaft → adjust coupling coaxiality within 0.03mm tolerance

4. Bearing failure / worn cam ring → replace bearing or full pump cartridge

5. Dirty oil with solid particles → replace oil & filter immediately

Q6：Can I change pump rotation direction on site without full pump replacement?

A：Yes. VQ single pump cartridge supports field rotation reversal: disassemble pump housing, rotate cam ring 180°, reinstall side plates & rotor assembly, no need to remove pump from equipment. Four port position combinations (90° interval) available for flexible installation layout.

Q7：How long is service life, and which parts wear fastest?

A：Under standard clean oil & rated pressure, service life 8,000–15,000 hours. Quick-wear consumables: vanes, cam ring inner surface, floating side plates, shaft oil seal, suction filter. Bearings rarely wear if installation coaxiality is qualified (10–15 years normal service).

Q8：High pump body temperature, overheating problem solutions?

A

1. Long-time overpressure operation → adjust relief valve to rated working pressure

2. Severe internal leakage (worn cartridge) → replace pump core

3. Insufficient system cooling → clean heat exchanger, increase cooling flow

4. Oil viscosity too low → switch to recommended AW hydraulic oil

5. Continuous no-load idle for hours → reduce idle running time

Q9：Installation key requirements to avoid early damage?

A

1. Suction pipe inner diameter ≥ pump inlet port size, total suction pipe length ≤1.5m

2. Shaft coupling coaxiality error ≤0.03mm; never hammer pump shaft during assembly

3. Mount pump horizontally as standard; vertical mounting must ensure full oil immersion of suction port

4. All housing bolts tightened crosswise evenly to prevent uneven axial clearance

5. Install pressure gauge at pump discharge for real-time pressure monitoring

Q10：What’s the difference between V series & VQ series single vane pumps?

A

• V Series: 12-blade design, low noise, max pressure 14MPa, for light-load general industrial machines

• VQ Series: 10 intra-vane design, high-pressure resistant (21MPa), wider speed range, superior cold start performance, fits injection molding, die-casting, construction machinery and heavy-duty hydraulic stations; cartridge interchangeable with original Vickers spare parts

Packaging & Delivery

VQ Series-single Pumps are typically packaged securely to prevent damage during transit. The packaging includes:

Protective Wrapping: To safeguard the high-precision pump body and shaft from moisture and environmental damage.

Custom Cartons or Crates: Individual reinforced packaging with shock-absorbent inserts for single pumps, and sturdy wooden crates for bulk or tandem pump orders to ensure safe handling.

Documentation: Includes technical data sheets, installation guides, and quality inspection certificates.

Delivery time depends on the specific model, port configurations, and destination but typically ranges from 1 to 4 weeks from the order date.

Certifications & Quality Assurance

Gear pumps are manufactured in compliance with international standards, ensuring high performance and reliability:

ISO 9001: Certified for quality management systems.

CE Certification: Ensures compliance with European safety, health, and environmental protection standards.

RoHS Compliance: Ensures the pump does not contain hazardous materials.

Factory Testing: Every pump is rigorously tested for performance, pressure, and leak integrity before shipping.