 |
The GL-25 Hexagonal Limit Valve for Dump Trucks is an essential safety device engineered to prevent hydraulic cylinder overextension. Designed with a robust metal construction and precise machining, this dump truck safety valve operates within a 0.6~1.2 MPa pneumatic control range. It features a total stroke of 26mm and an adjustable range of 15mm, allowing for precise calibration of the tipping height. When the cylinder reaches its preset limit, the valve instantly cuts the air supply to the directional control valve, halting further movement. Its compact two-hole mounting with bracket design ensures easy installation and compatibility with various tipper truck models, providing reliable overstroke protection for hydraulic cylinders and enhancing operational safety in demanding environments.
Core application:
Widely used as a standard component for stroke control of the multi-section hydraulic cylinder on the front top of mainstream heavy-duty dump trucks such as HOWO, medium and heavy-duty dump trucks and multi-axle engineering dump trucks. By limiting the precise unloading angle when the cargo box is raised to the top, the hydraulic system is forced to stop lifting, fundamentally preventing cylinder expansion, cylinder disengagement, and vehicle rollover accidents caused by over-lifting of the cargo box .
High-intensity operating conditions: Special vehicles for mining and construction sites
are designed for harsh working environments with high dust, high humidity, and abundant mud and sand . Its characteristic hexagonal hardened metal valve body and robust physical contact rod can withstand tens of thousands of violent, repetitive physical impacts from large tonnage cargo boxes without deformation, maintaining precise operation even under extreme engineering impact loads.
Unique Features: Flexible Fastening for Unconventional Modifications and Compact Chassis Space.
Unlike common four-hole panel mount types (such as GL-22W), the GL-25 utilizes a proprietary two-hole flange with bracket structure . This makes it ideal for direct fastening to the lower base of hydraulic cylinders, the main longitudinal beams of the chassis, or the ends of complex side limiting cables , providing exceptional installation flexibility for specialized dump trucks with limited chassis space or requiring personalized modifications .
| Parameter | Specification |
|---|---|
| Product Type | Knock-off valve |
| Model Number | GL-25 |
| Total Range | 24mm |
| Adjustable Range | 15mm |
| Pneumatic Control Range | 0.6~1.2MPa |
Applications
Heavy Wheel Loaders & Excavators: Used to split fluid from the main piston pump, prioritizing smooth hydraulic power steering lines while routing the remaining flow to drive heavy boom, arm, and bucket actions.
Complex Sanitation & Garbage Compactors: Coordinates multiple automated steps. It precisely distributes pump power so the vehicle can lift heavy trash containers smoothly while running high-pressure compaction blades at a controlled, uniform speed.
Large Mobile Mining & Drilling Rigs: Feeds high-pressure oil to auxiliary stabilizer jacks while maintaining steady, non-pulsating rotation fluid on the primary drill motor line.
GL-25 Limiting Valve Knock-off Valve for Tipper Truck 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 valve. Under normal conditions, it remains open, allowing the air pressure signal from the cab to be transmitted to the main control distribution valve for lifting the truck bed. When the truck bed is raised to its highest point and physically impacts its contact rod, the valve core instantly switches positions, cutting off the air supply and quickly expelling (depressurizing) the residual air in the main control distribution valve's air chamber, causing the main control valve to immediately reset to the "stop" position, forcing the hydraulic cylinder to stop lifting.
A: It offers extremely high installation flexibility . Unlike the GL-22W (four-hole) which relies on panel mounting, the GL-25's exclusive two-hole flange with bracket structure does not require a large area of flat mounting steel plate. It can be directly suspended and fastened to the lower base of the hydraulic cylinder, the main longitudinal beam of the frame, or the end of complex side limit cables , making it ideal for vehicles with tight chassis space or irregular modifications.
A: This will cause the truck bed to "be unable to be raised again" after it is lowered . This is because when the lever is stuck in the "pressed" state, the limit valve still determines that the truck bed is at its highest point, and the air circuit remains in the "cut-off/depressurization" state. At this time, no matter how you turn the lift switch in the cab, the air control signal cannot be transmitted to the hydraulic distribution valve, and the entire lifting system will completely lose response.
A: This is usually not due to valve body damage, but rather to adjustable stroke deviation or bracket loosening . The GL-25's contact rod has a built-in 15mm threaded adjustment range. If the screws of the fixing bracket loosen and shift downwards due to long-term mechanical impact, or if the adjusting nut falls out, it will cause the carriage to prematurely touch the upper limit valve in mid-air, resulting in frequent premature gas cut-off and accidental termination of lifting.
A: First, check the outer shell material. Since this valve needs to withstand tens of thousands of violent physical impacts, a high-quality valve body must be made of hardened anodized aluminum alloy or precision-cast metal . Second, check the sealing specifications. It is recommended to choose a valve made Models equipped with high-grade HNBR seals and supplied by mature supporting manufacturers are available to ensure that the internal high-strength return spring remains agile and responsive under conditions such as vehicle condensation, low-temperature freezing, or extreme high temperatures .
Yes, we support OEM and customization, including nameplate, packaging, and specific performance requirements. Send us your drawings or specifications for evaluation.
GL-H1220-AO-Integral Shunt Combination 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 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.
