Hydraulic Valve Core
Tianjin TGE BIAM Graphene Technology Co., Ltd. is one of the most reliable manufacturers and suppliers of hydraulic valve core in China. Welcome to buy bulk durable hydraulic valve core in stock here from our factory. If you have any enquiry about customized service and quotation, please feel free to email us.
Product Introduction
Hydraulic valve cores control flow direction, pressure, and volume in hydraulic power systems across mobile equipment, industrial machinery, and process plant. The operating environment - mineral or synthetic hydraulic oil, cyclic pressure loading, elevated temperature in loaded circuits, and often high actuation frequency - defines a set of requirements that the valve core compound and construction must meet simultaneously: oil resistance, thermal stability, low compression set, and bond integrity under dynamic loading.
NBR is the standard compound for hydraulic valve cores in systems operating below 80°C. HNBR is the correct selection for systems operating continuously above 100°C or in applications with elevated abrasion or fatigue loading at any temperature.
Introduction to Performance
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NBR Hydraulic Grade |
−40°C to +70°C standard; HNBR recommended for continuous service above +70°C |
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HNBR Hydraulic Grade |
−40°C to +150°C; for high-temperature systems and sour oil service |
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Hydraulic Fluid Compatibility |
Mineral oils (HM, HV grades), zinc-free hydraulic oils, biodegradable hydraulic fluids (Subject to compound compatibility review) |
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Compression Set |
<25% after 70 hours at 100°C (ASTM D395); maintains sealing force across pressure cycles |
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Dynamic Fatigue |
Compound and bond designed for over a million actuation cycles at operating frequency |
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Dimensional Accuracy |
Controlled molding tolerances to ensure consistent actuation force and leak-free shut-off across production batches |
Introduction to Processing Techniques and Materials
Hydraulic valve cores are high-precision components where dimensional consistency across production batches determines system performance repeatability. Hardness variation, seal land geometry, and surface finish at the sealing face must be controlled to tolerance, not simply to specification limits, across every production run.
Compound formulation for hydraulic service emphasizes low compression set - the property that determines whether the valve core maintains its sealing geometry and seating force after sustained loading. Cure state is the primary variable. Cure parameters are documented and controlled per batch, and compression set is measured on production rubber samples, not assumed from formulation data alone.
Bond integrity under cyclic hydraulic pressure loading is verified by pulling testing. The bond interface demanding high quality of metal treatment and molding process control.
Typical Applications
Typical Applications of Hydraulic Valve Core include:
· Directional control valves (DCVs) in industrial hydraulic power units
· Mobile equipment hydraulic systems: excavators, cranes, wheel loaders, agricultural tractors
· Pressure relief, sequence, and counterbalance valve cores
· Proportional and servo hydraulic control valve sealing elements
· Hydraulic cylinder and motor port valve components
· Marine and offshore hydraulic deck machinery control valves
Advantages
Hydraulic valve core supply is a high-volume, precision-manufacturing process. Consistency of quality- compound properties, dimensional tolerances, and bond integrity batch to batch - is what separates a qualified supplier from a commodity source. Variation in compression set or hardness produces variation in seating force and actuation pressure; variation in bond quality produces field failures that are difficult to attribute and expensive to remediate.
Our hydraulic valve cores are manufactured to fixed, documented compound formulations with per-batch cure records and compression set verification. For OEM supply, we support customer qualification processes with compound data, QC documentation, and sample approval.
FAQ
Q: Are you a manufacturer or trade company? Where are you?
A: We are manufacturer and our factory is located in Tianjin, China. We can design the rubber formulation, we can design the product structure, we have all the manufacturing and testing equipment in our factory (such as mixer, sand blasting, vulcanizing, rheometer, Mooney test machine, tensile test machine, low-temperature brittleness test machine, stiffness test machine, etc.).
Q: Do you make rubber compound by yourself or buy it from others?
A: We make rubber compound by ourselves, with multiple rubber mixing machines in our factory. We can also design the rubber formulation to meet the performance requirement of different applications.
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