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GL-22
cissoko
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The GL-22 Four-Port Limit Valve is a critical safety component engineered for tipper truck hydraulic lift systems. This specialized dump valve acts as an automatic safety cut-off. When the hydraulic cylinder reaches the preset maximum lift height during unloading, it instantly shuts off the air supply to the directional valve's cylinder. This action halts the cylinder's movement, effectively preventing dangerous over-lifting and potential cylinder detachment accidents. With a total stroke of 26mm, an effective stroke of 22mm, and a pneumatic control range of 0.6~1 MPa, this robust limit valve ensures reliable performance. It is an essential upgrade for enhancing the safety and operational control of various tipper trucks, including mining dumps and construction vehicles, safeguarding both the equipment and the operator.
22mm effective travel lever: When the truck bed is raised to its limit angle, a physical impact to the lever cuts off the air control signal in the cab in milliseconds , 100% preventing cylinder expansion, cylinder disengagement and rollover tragedies caused by over-lifting.
Dual reset pressure protection: The internal structure adopts a dual reset structure of pressure and spring, which cuts off the lifting in time before the oil cylinder reaches the dead point, avoiding continuous pressure overload of the system and greatly extending the service life of the hydraulic front cylinder and high-pressure gear pump.
Advanced HNBR seals: The internal seals can withstand extreme temperatures from -55°C to 180°C , ensuring reliable operation whether in extremely cold mining areas in the north or high-frequency engineering sites in the south.
| Parameter | Specification |
|---|---|
| Product Type | Knock-off valve |
| Model Number | GL-22 |
| Total Range | 24mm |
| Adjustable Range | 15mm |
| Pneumatic Control Range | 0.6~1.2MPa |
Applications
Core application:
This valve is widely used as a standard component for the front-mounted multi-section hydraulic cylinder stroke control on heavy-duty dump trucks and large-capacity semi-trailers, such as those from HOWO and Shaanxi Automobile. Because the center of gravity of the long cargo box is extremely high during lifting, this valve forces the system to stop lifting by limiting the precise tipping angle, fundamentally preventing rollover accidents on uneven ground or in strong crosswinds .
High-intensity operating conditions: Specialized vehicles for mining and urban sanitation
are used in off-highway mining trucks, heavy-duty engineering hooklift trucks, and large garbage compactors. Their internal components utilize advanced HNBR seals capable of withstanding extreme temperatures from -55℃ to 180℃ , ensuring precise operation even under high-intensity vibrations in mining areas, heavy mud and sand impacts, and high-frequency operations in sanitation scenarios.
Aftermarket modification: The universal in-situ replacement for HYVA air control systems
is a popular standard component and aftermarket repair part. It adopts a universal four-hole mounting layout and air port design, and can be used as a drop-in (non-destructive) replacement part for HYVA 3D lift valve limit system. It allows for quick in-situ replacement for aftermarket maintenance without the need to modify the air circuit or bracket.
Dump Truck Hydraulic Knock-off Valve GL-22 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.
A: It is a "two-position three-way" pneumatic control switch . Under normal conditions, it is open, allowing the air pressure signal from the cab to be transmitted through it to the hydraulic distribution valve for lifting the truck bed; when the truck bed is raised to the highest safe angle and physically impacts its contact rod, the valve core switches positions, cutting off the air supply and quickly expelling (depressurizing) the residual air in the distribution valve chamber , causing the distribution valve to immediately return to the "stop" position and forcibly stop the lifting.
A: It's not necessarily a valve body failure. Please first check if the valve's installation position or the adjustable rod (usually with an adjustable range of about 15mm) is loose or has shifted downwards . If the impact block or rod is positioned too low, it can cause the limit valve to be triggered prematurely when the truck bed is only halfway raised, thus mistakenly cutting off the air circuit signal.
A: The consequences are extremely serious. When the carriage reaches its highest point, the system cannot cut off the pneumatic control signal, and multiple hydraulic cylinders will forcibly push the entire cylinder to the top, causing pressure buildup . This can cause the high-pressure gear pump to instantly overload and stall. In more serious cases, it can cause the expensive front lifting cylinder to directly "expand" and deform, the seals to burst, and even cause the lifting bracket to break and the entire vehicle to overturn.
A: Their internal valve core structure, working principle, and function are completely identical. The core difference lies in the layout of the fixed holes on the external valve body and the installation method (for example, the GL-22W usually uses a specific four-hole flange panel mounting). During after-sales replacement, as long as the physical mounting hole spacing and pipeline interface threads (such as the common M10×1 or G1/8 air port) are consistent, they can be substituted for each other.
A: Yes, it's fully compatible. The GL-22 is a standard, mature part developed for the heavy-duty truck parts supply chain, and its design is completely aligned with the parameters of mainstream pneumatic dump truck systems such as the HYVA 3D series. During fleet maintenance or modification, it can be directly replaced in situ without damage (drop-in replacement).There is no need to modify the chassis air circuit or re-weld the mounting bracket.
Yes, we support OEM and customization, including nameplate, packaging, and specific performance requirements. Send us your drawings or specifications for evaluation.
Dump Truck Hydraulic Knock-off Valve GL-22 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 Valve 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.
