In a hydraulic schematic, what does a diamond symbol surrounding a component signify?

In a hydraulic schematic, a diamond symbol surrounding a component indicates that the component is mounted on or within a manifold block. A manifold block is a central, often custom-designed, block of metal (usually aluminum or steel) that provides a compact and organized way to mount multiple hydraulic components, such as valves, cartridges, and sensors. Instead of connecting individual components with numerous pipes and fittings, they are directly mounted onto the manifold block, with internal passages within the block connecting them. The diamond symbol essentially signifies that the component is not a standalone unit connected via hoses or pipes, but rather an integral part of a manifold assembly. This type of mounting offers several advantages. First, it reduces the number of potential leak points by minimizing the number of external connections. Second, it simplifies hydraulic circuitry, making it easier to troubleshoot and maintain. Third, it provides a more compact and cleaner installation, which is especially important in excavators where space is often limited. Fourth, it can improve system performance by reducing pressure drops and flow restrictions due to shorter and more direct fluid paths. Manifold blocks are commonly used in excavator hydraulic systems for functions like valve control, pressure regulation, and flow control. The components within the diamond symbol represent the specific functions performed by that part of the manifold. For example, a directional control valve symbol inside a diamond indicates that the valve is mounted on a manifold block. Therefore, when reading a hydraulic schematic, the diamond symbol provides important information about the physical arrangement and integration of hydraulic components within the system.