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VG20
cissoko
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The Parker VG20 Series Directional Control Valve is a premium, high-pressure sectional hydraulic spool valve. It is widely used in heavy-duty mobile machinery and vocational trucks, capable of managing flow rates up to 150–170 L/min (40–45 GPM).
Elevated Pressure Thresholds: Safely maintains continuous high-pressure performance of 241 bar (3,500 PSI), outperforming standard grey iron variants (like the VA20, which is capped at 2,500 PSI).
Low Pressure Drops: Engineered with optimized internal coring to significantly decrease hydraulic drag. This structural optimization allows cylinders to retract with up to 30% less pressure resistance than conventional open-center blocks.
Hi-Boy vs. Lo-Boy Sections: Features deep customizable casting profiles. "Hi-Boy" slices accept work port relief cartridges, crossover reliefs, or anti-cavitation check valves, while "Lo-Boy" slices maintain a low-profile format for basic functions.
Multi-Input Actuation: Supports traditional manual handles, pneumatic air shifters, hydraulic remote pilots, or electro-hydraulic proportional solenoids
| Parameter | Official Value | Unit | Remarks |
|---|---|---|---|
| Material | High-Strength Compacted Graphite Iron (CGI) | — | Exceptional fatigue strength with excellent resistance to cracking and deformation under high-pressure, high-flow conditions |
| Construction | Sectional / Stack-Type | — | Can be configured with 1–10 working sections according to system requirements |
| Maximum Recommended Design Flow | 170 (45) | L/min (GPM) | High-flow control valve suitable for large-displacement piston pumps or dual gear-pump systems |
| Maximum Continuous Pressure | 241 (3,500) | bar (psi) | Standard maximum continuous working pressure for the entire series; approximately 40% higher than the VA20 series |
| Maximum Work-Port Pressure | 241 (3,500) | bar (psi) | Maximum pressure permitted at the A/B ports connected to actuators, including heavy-duty lifting cylinders |
| Maximum Back Pressure – T Port | 21 (300) | bar (psi) | High permissible return-line back pressure; advanced sealing design improves seal durability |
| Circuit Types | Parallel / Series / Series-Parallel / Independent Multi-Circuit | — | Supports combinations of parallel and series circuits within the same valve bank |
| Section Profiles | Hi-Boy / Lo-Boy | — | Hi-Boy sections can accommodate secondary relief and anti-cavitation valves; Lo-Boy sections offer a lighter and more compact design |
| Spool Diameter | 0.75 in (19.05 mm) | — | Standard spool diameter with a longer stroke and excellent proportional metering performance |
Applications
Vocational Trucks: Powers heavy mechanisms on dump trucks, refuse vehicles, and utility utility frameworks.
Heavy Construction Equipment: Controls loaders, backhoes, and medium-sized excavators.
Oil & Gas Mobile Systems: Deployed in demanding or hazardous material handling oilfield rigs requiring severe pressure integrity.
VG20 valves 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.
Material Strength: The VG20 is cast from Compacted Graphite Iron (CGI), whereas the VA20 uses standard gray iron.
Pressure Rating: Because CGI offers double the fatigue resistance of gray iron, the VG20 safely handles a high continuous working pressure of 241 bar (3,500 PSI), compared to the VA20 which is strictly limited to 172 bar (2,500 PSI).
Port Constraints: Due to the higher pressure threshold, the VG20 strictly prohibits NPT tapered pipe threads to prevent stress cracking. It requires premium SAE straight-thread O-ring (ORB) connections.
Hi-Boy Work Sections: These slices feature an elevated casting profile with extra machined ports. They accept individual work port relief valves or anti-cavitation check valves, letting you limit pressure on specific circuits.
Lo-Boy Work Sections: These slices have a flat top and lack machining for auxiliary cartridges. They are lighter and more economical, designed for basic hydraulic functions that only need the main system relief.
Advanced Internal Routing: Yes. One of the signature features of the VG20 series is its ability to support hybrid internal circuitry.
The Workflow: You can assemble a valve bank where Sections 1 and 2 run on a parallel circuit layout (oil divides based on resistance), while Section 3 utilizes a tandem or series circuit configuration (oil passes down downstream only after preceding sections finish). This allows precise control over entirely different types of mechanical movements on one machine.
Restricted Tank Return Line: The VG20 handles massive flow up to 170 L/min (45 GPM). If the return-to-tank (T) port is choked down with a narrow or kinked hose, back-pressure will spike inside the valve core.
High Internal Parasitic Loss: Excessive back-pressure forces the pump oil to fight a bottleneck inside the neutral gallery. This slows down cylinder retraction times, wastes truck engine fuel, and causes the overall hydraulic oil to overheat rapidly. Always use a minimum of a 1-inch (SAE 16) low-resistance hose for the main tank line.
Uneven Tie Rod Tension: Sectional CGI blocks are rigid but still sensitive to torque. If the three main tie rods are tightened unevenly, the individual slices will tilt or compress askew.
Microscopic Bore Distortion: This imbalance microscopically warps the straightness of the 0.75-inch internal spool bore, pinching the sliding metal spool.
The Fix: Loosen the tie rods completely. Using a reliable torque wrench, tighten the nuts incrementally in a balanced cross pattern up to the factory specified torque of 38 to 43 N·m (28 to 32 ft-lbs). Never overtighten them.
Yes, we support OEM and customization, including nameplate, packaging, and specific performance requirements. Send us your drawings or specifications for evaluation.
VG20 Valve 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 valve is rigorously tested for performance, pressure, and leak integrity before shipping.
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.
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.
Of course we can. Just send me your logo we can make it for you.
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%).
The Cissoko 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.
Cissoko 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.
All hydraulic pumps produced by Cissoko Hydraulic have undergone compliance testing, ensuring their quality and reliability.
To meet the diverse needs of different industries, the Cissoko 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.
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.
