Description
CAT 352-7232 9.5mm Long Valve Seat
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The CAT 352-7232 is a Caterpillar original hydraulic valve seat, compatible with directional valves, relief valves, or pressure reducing valves in high-pressure hydraulic systems. It is used in the main control valve assembly of excavators, loaders, and other equipment. Its core function is to precisely seal with the valve core, controlling the flow and pressure regulation of hydraulic oil. It is compatible with the main control valves of Cat® models such as the 320D/336D and 950H…
Core Technical Parameters
Item Details
Part Model CAT 352-7232 Hydraulic Valve Seat
Material High-strength alloy tool steel, nitrided surface, hardness HRC 58-62, wear-resistant layer thickness 0.1-0.15mm, high pressure ≥35MPa, temperature resistance -40℃ to 120℃, compatible with mineral oil and synthetic hydraulic oil, aging resistant, corrosion resistant
Key Dimensions Inner diameter 18-25mm, outer diameter 30-38mm, thickness 8-12mm, sealing surface cone angle 30°/45° (common specifications), surface roughness Ra≤0.1μm, coaxiality tolerance≤0.005mm, clearance with valve core 0.008-0.012mm, ensuring high-pressure sealing
Compatible Models Compatible with CAT 320D/323D/336D excavators, 950H/966H This product is used in loaders, such as the 430F2 loader, for directional valves, relief valves, and pressure reducing valve seats in main control valves (e.g., 35V series). It is compatible with hydraulic systems for C6.4/C9/C13 engines.
Performance Features: High-pressure sealing design, suitable for working pressures of 25-35MPa. A nitrided layer improves wear resistance, reduces valve core wear, and extends service life. Suitable for flow rates of 10-30L/min. Precision-ground sealing surfaces ensure leakage ≤0.1L/min, guaranteeing hydraulic system efficiency.
Core Functions and Structure:
High-pressure sealing: Precisely fits the valve core’s conical/spherical surface to form a high-pressure sealing pair, preventing hydraulic oil leakage and ensuring stable system pressure. Suitable for high-pressure directional and pressure regulation conditions.
Flow control: The valve seat inner diameter and sealing surface angle determine the flow area, precisely controlling the hydraulic oil flow rate in conjunction with the valve core stroke. It adapts to flow requirements under different loads, ensuring smooth actuator operation.
Guiding and Positioning: Provides radial guidance for the valve core, ensuring coaxiality of valve core movement, reducing uneven wear, improving valve assembly response speed, adapting to high-frequency reversing conditions, and reducing hydraulic shock.
Wear Resistance and Protection: Alloy material and nitriding treatment enhance wear resistance and impact resistance, adapting to the frequent start-stop and large load fluctuation conditions of engineering machinery, extending the service life of the valve seat and valve core.
Installation and Maintenance Points
Installation Specifications: Clean the valve seat mounting hole and sealing surface, removing oil and impurities. Check the valve seat for cracks and deformation, the sealing surface for scratches and dents, and the nitriding layer for peeling.
Use a special tool to press in during installation; do not strike. Ensure an interference fit between the valve seat and the mounting hole (interference 0.015-0.025mm), align the sealing surface and valve core, and maintain a coaxiality deviation ≤0.01mm.
After installation, check the valve core’s movement flexibility for any jamming. Test the sealing performance to ensure no leakage. Tighten the valve cover bolts to the specified torque (usually 15-25 N·m). Maintenance Recommendations:
Check the valve seat sealing surface for wear every 1500 working hours. Measure the sealing surface clearance. Replace the valve immediately if the clearance exceeds 0.02mm to prevent leakage and system pressure drop.
Regularly replace the hydraulic oil and filter element to ensure oil cleanliness reaches NAS 7 or higher. This prevents impurities from entering the valve seat and valve core mating surfaces, accelerating wear.
