In stack valves, which valve is typically mounted first on the sub-plate?

In stack valves, the maximum pressure relief valve is typically mounted first on the sub-plate. This is due to the essential function of the pressure relief valve in regulating and controlling the overall hydraulic system pressure to prevent damage to the system components. By being positioned at the top, it allows for effective monitoring and response to excessive pressure within the hydraulic circuit.

When the maximum pressure relief valve is installed first, it ensures that it can effectively manage pressure before the flow passes through other components. This prioritization is important because if the pressure relief is not properly addressed, excessive pressure could lead to unsafe operating conditions, potential equipment failure, or damage to the directional control and flow control valves that follow.

In contrast, directional control valves, flow control valves, and cross port reliefs serve specific roles in directing flow, controlling flow rates, and providing safety but are secondary to the fundamental need for pressure regulation. Their placement after the pressure relief valve becomes essential for maintaining an effective and safe hydraulic control system.