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VG1 Cast Iron Hydraulic Gear Pumps

The VG1 is a high‑pressure internal gear pump designed for hydraulic systems, especially servo‑driven energy‑saving setups. It features axial/radial pressure compensation, enabling high volumetric efficiency even at low speeds or with low‑viscosity fluids. Built with high‑strength cast iron and an internal silencer, it operates at ultra‑low noise and minimal flow/pressure pulsation. The VG1 delivers a max pressure of 35 MPa and a max speed of 3000 rpm, offering reliable, long‑life performance insensitive to oil contamination. It is widely used in injection molding, die‑casting, and other industrial hydraulic systems.

Model:
VG1
Brand:
Green Hydraulic
Model Number:
VG1
Packaging Details:
Standard export carton/plywood case
Testing Before Shipment:
Yes
Cartification:
ISO9001，CE
Markets:
• Industrial • Energy • Government (Non Aerospace) • HVAC • Mobile • Natural Resources • Transportation (Non Aerospace)
Application:
1. Industrial Hydraulic Systems 2. Mobile Equipment (Industrial Vehicles) 3. Construction and Engineering Machinery 4. Metallurgy Industry
Shaft Type:
Key Shaft and Spline shaft
MOQ:
1 set


Availability:



Inquiry

Product Description

VG1 Gear Pump Overview

The VG1 is a high-performance, fixed-displacement internal gear pump engineered for compact, energy-efficient hydraulic systems, particularly servo-driven and low-noise applications. Featuring precision-machined components and advanced pressure compensation, the VG1 is specifically designed to deliver high volumetric efficiency at low speeds and with low-viscosity fluids, making it an ideal choice for injection molding, die-casting, and industrial machinery where quiet operation and reliable high-pressure performance are essential.

VG1

Features and Benefits

Robust Cast Iron Construction:
The VG1 is built with high-strength cast iron bodies and covers, providing superior structural rigidity and resistance to internal deflection under continuous high-pressure duty cycles. This rugged construction minimizes mechanical fatigue and ensures extended service life in demanding industrial environments.
Pressure-Balanced Axial Compensation Design:
Utilizing advanced axial pressure-compensated wear plates, the VG1 automatically optimizes internal clearances between gear faces and the housing. This design reduces internal fluid bypass and friction, maintaining high mechanical efficiency and consistent power delivery across a wide range of operating temperatures.
Low-Noise, Low-Pulsation Operation:
The VG1’s internal gear profile and integrated silencer features reduce flow and pressure pulsation, resulting in ultra-quiet operation. This makes it well-suited for noise-sensitive applications, improving overall system stability and operator comfort.
Superior High-Pressure Capability:
Engineered to handle continuous operating pressures of up to 35 MPa (5,075 psi), the VG1 features precision-ground gears and high-precision components that enable smooth, reliable flow even under high-force loads. Its contamination-tolerant design ensures stable performance with typical industrial hydraulic fluids.
Compact, Versatile Installation:
The VG1 series offers a versatile range of displacements (from [insert cc/rev range] as standard) and supports common SAE mounting and port configurations. Its compact footprint and flexible porting options allow for easy integration into space-constrained hydraulic circuits, making it suitable for both new machinery and retrofit applications.

Specifications

Model Codes

Technical Data

Parameter	Unit	VG1 Series Specification
Displacement Range	cc/rev	10.2 – 40.6
Max Continuous Pressure	MPa (psi)	35 (5,075)
Max Intermittent Pressure	MPa (psi)	38 (5,510)
Rated Speed Range	rpm	600 – 3,000
Minimum Stable Speed	rpm	200
Max Volumetric Efficiency	%	≥ 94
Mechanical Efficiency	%	≥ 92
Fluid Viscosity Range	cSt	10 – 1,000
Operating Temperature Range	°C (°F)	-20 to +80 (-4 to +176)
Mounting Flange	Standard	SAE “A” / SAE “B”
Port Configurations	-	Side / Rear / Dual-Port
Shaft Options	-	Straight / Keyed / Splined
Body Material	-	High-strength cast iron
Gear Material	-	High-grade alloy steel
Pressure Compensation	Type	Axial + Radial
Noise Level @ 1,500 rpm	dB(A)	≤ 65
Weight (Max Displacement)	kg (lb)	8.5 (18.7)

VG1 Hydraulic Gear Pump Installation Dimensions：

Applications

Applications

The VG1 series provides a high-efficiency, low-noise power solution specifically tailored for industrial and energy-saving hydraulic systems where quiet operation, compact design, and reliable high-pressure performance are essential:

Injection Molding & Die-Casting Machinery:
A primary choice for servo-driven injection molding machines and die-casting equipment, where the VG1’s high volumetric efficiency at low speeds reduces energy consumption and ensures precise, repeatable control of mold clamping and injection cycles.
Hydraulic Presses & Forming Equipment:
Optimized for small-to-medium hydraulic presses, stamping machines, and metal forming systems, where its pressure-balanced design maintains consistent power delivery under continuous, high-cycle loads while minimizing noise and heat generation.
Material Handling & Automation:
Widely used in automated assembly lines, hydraulic lifting tables, and conveyor systems that require smooth, low-pulsation flow. The VG1’s contamination tolerance and long service life make it ideal for continuous operation in factory environments.
Machine Tool & CNC Equipment:
Ideal for CNC machine tools, hydraulic clamping systems, and tool changers, offering quiet, stable hydraulic power that supports precision machining and reduces overall system noise levels in the workshop.
Plastic & Rubber Processing:
Frequently employed in plastic extruders, blow molding machines, and rubber processing equipment, where the VG1 handles variable viscosity fluids and provides consistent pressure control for critical forming and extrusion operations.
Specialized Industrial Machinery:
Suited for a wide range of custom hydraulic circuits, including test benches, hydraulic power units, and energy-efficient retrofit projects, where its compact footprint and flexible mounting options simplify integration into new or existing systems.

Factory&FAQ

Packaging & Delivery

VG1 pumps are typically packaged securely to prevent damage during transit. The packaging includes:

Protective Wrapping: To safeguard the pump from environmental damage.

Custom Crates: For larger, heavier pumps, ensuring safe handling.

Documentation: Includes installation, maintenance instructions, and warranty details.

Delivery time depends on the model, customizations, and location but typically ranges from 2 to 6 weeks from the order date.

VG1 Gear Pump FAQ:

1. What are VG1 series gear pumps?

The VG1 is a high-performance, fixed-displacement internal gear pump designed for compact, energy-efficient hydraulic systems. Featuring precision-machined cast iron construction and advanced pressure compensation, it is specifically engineered for applications requiring low noise, high volumetric efficiency, and reliable high-pressure output, especially in servo-driven and industrial machinery.

2. What makes the VG1 different from standard aluminum gear pumps?

The VG1 is purpose-built for durability and performance in demanding industrial environments where aluminum pumps may underperform:

High-Strength Cast Iron Housing: Unlike aluminum pumps prone to deflection under high pressure, the VG1’s robust cast iron frame maintains tight internal clearances, ensuring long service life and consistent performance under continuous high-duty cycles.
Advanced Pressure Compensation: With both axial and radial pressure compensation design, it minimizes leakage, delivers higher volumetric efficiency, and offers superior resistance to pressure shocks compared to typical aluminum-body pumps.
Ultra-Low Noise Operation: Featuring internal flow distribution and unique muffler geometry, it runs significantly quieter than standard external gear pumps, making it ideal for noise-sensitive servo systems.
Oil Contamination Tolerance: Its internal gear design is far less sensitive to fluid contamination, reducing wear and extending maintenance intervals compared to aluminum gear pumps with tighter manufacturing tolerances.

3. What is the working pressure range of VG1 pumps?

The VG1 is a dedicated high-pressure specialist for industrial applications. Depending on displacement and configuration:

Continuous Pressure: Up to 3,625 PSI (250 bar).
Intermittent/Peak Pressure: Up to 5,075 PSI (350 bar).

This robust pressure rating makes the VG1 ideal for high-force, energy-efficient systems on injection molding machines, die-casting presses, and heavy-duty utility vehicles.

4. Can VG1 pumps replace other brands?

Yes, the VG1 is a high-quality drop-in replacement or upgrade for premium compact cast iron internal gear pumps. It is commonly used to replace:

Rexroth PGH Series: Specifically compatible with the PGH4 series pumps.
Sumitomo Internal Gear Pumps: Widely used as a direct replacement in servo injection molding applications.
Other brands like Eckerle, Voith: Compatible with common SAE/ISO mounting standards and shaft configurations.

To ensure a seamless swap, verify the Mounting Flange (SAE standard), Shaft Type (straight/spline), and Displacement (cm³/rev) to match your existing system.

5. What hydraulic oil is suitable for VG1 gear pumps？

To protect the precision pressure-compensated components and hardened steel gears, the following is recommended:

Oil Type: Premium mineral-based hydraulic fluids with robust Anti-Wear (AW) and anti-oxidation additive packages.
Viscosity: Standard ISO VG32 to VG68. The optimal operating range is 100 to 150 SUS (20 to 30 cSt), though it can handle cold starts up to 2,000 SUS (430 cSt).
Filtration: Cleanliness is critical for pressure compensation performance. A minimum filtration level of ISO 4406 18/16/13 is recommended to prevent abrasive particles from damaging the pump’s internal surfaces.

6. What is the typical speed range of VG1 pumps?

The VG1 features a wide, flexible speed range, making it ideal for variable-speed servo drives:

Minimum Continuous Speed: 500 RPM.
Maximum Continuous Speed: Up to 3,000 RPM (model-dependent).

This broad operating range allows for precise flow control in energy-saving servo systems while maintaining high efficiency across varying loads.

7. Do you provide OEM or customized services?

Yes, we support OEM and customization, including nameplate, packaging, and specific performance requirements. Send us your drawings or specifications for evaluation.

8. How can I get a quotation quickly

Please provide the following details:

Model or displacement
Working pressure
Speed
Quantity
We will reply within 12 hours with a competitive quotation.

Certifications & Quality Assurance

VG1 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.

FAQ

1.What's our advantages?

Factory established in 2005;

With a great deal of production experience;

80+ employees become the professional team;

Constant updated ERP system ensure efficiency of work;

Sophisticated equipment ehanced the accuracy of products;

Professional salesmen provide the greast service;

With a large number of famous customers all over the world;

Great after-sales service;

With the long term cooperation with famous logistics and express company in China,provide the better goods service.

2.What is your payment terms?

Small order/sample order,full payment in advance; Big orders send the first payment 30% before the production,and the balance before shippment.We'll show the photos of the products and packages before delivery.

3.Can you make my own brand on the products?

Of course we can. Just send me your logo we can make it for you.

4.What is our main export market?

America(40.5%):USA, Canada, Argentina, Brazil

Europe(30.8%):Italy,Germany,England,Holland,Spain,Swiss,Finland,Russia,Poland.

Asia(23.5%):Korea,singapore,India,Turkey,Vietnam,Saudi Arabia,Syria, Israel,Lebanon.

Others(5.8%).

Unedited footage of the Green Hydraulic Factory

The Green hydraulic pump manufacturing facility is a specialized industrial plant that focuses on producing hydraulic pumps and related components. These factories are equipped with advanced machinery and technology to fabricate high-quality pumps designed for a wide range of applications, from heavy equipment and machinery to automotive and industrial systems.

The production process typically involves precision engineering, where raw materials like metals and alloys are processed into pump components such as gears, pistons, cylinders, and seals. These parts are then assembled into fully functional hydraulic pumps, which are tested for performance and quality control to ensure reliability, efficiency, and durability under various working conditions.

Green Hydraulic's manufacturing facilities for hydraulic pumps maintain stringent quality standards, often adhering to international certifications, to meet the expectations of customers in industries such as construction, agriculture, automotive, and manufacturing.

Unedited footage of the Green Hydraulic Factory3

All hydraulic pumps produced by Green Hydraulic have undergone compliance testing, ensuring their quality and reliability.

Unedited footage of the Green Hydraulic Factory4

To meet the diverse needs of different industries, the green hydraulic offer customization options, such as specialized seals, materials, and pump configurations. These facilities often work closely with engineering teams to develop tailored solutions for specific applications, from high-pressure systems to low-flow, high-efficiency pumps.

Unedited footage of the Green Hydraulic Factory5

Each pump undergoes a rigorous quality control process, where pressure tests and performance assessments are conducted to ensure that the pumps meet the required standards for flow rate, pressure capacity, and durability.