Summary of Selection Points, Combination Rules, and Industry Application Scenarios for Stacked Valves

The modular combination characteristics of stacked valves make their adaptability far superior to ordinary hydraulic valves, but also pose higher requirements for selection and valve group matching. Many users often encounter problems such as valve plate mismatch, oil circuit pressure, control failure, installation interference, etc. during use, mostly due to selection errors and combination logic errors. To assist enterprises in selecting and reasonably matching valve groups, this article summarizes the key selection points, combination rules, and mainstream application scenarios of stacked valves based on industrial practical experience.

1、 The selection parameters of the stacked valve core are essential for all four indicators. The first step is diameter matching. When stacking valve groups, it is necessary to ensure that all valve disc diameters are completely uniform. Common diameters include 6-diameter, 10 diameter, 16 diameter, etc. Inconsistent diameters can directly lead to oil circuit misalignment, insufficient flow, and abnormal pressure, which is an important principle for selection basis. Next is the adaptation of rated pressure, which needs to be selected according to the system working pressure. For conventional industrial conditions, the 21MPa grade should be selected, and for high-pressure heavy work conditions, the 31.5MPa high-pressure model should be selected. Low pressure valves are prohibited from being used in high-pressure systems to avoid valve deformation, leakage, and damage. Once again, it is about functional matching. Select the corresponding valve plate according to the equipment control requirements. Use stacked overflow valves for voltage stabilization, stacked pressure reducing valves for pressure reduction, stacked throttle valves for speed regulation, and stacked one-way valves for pressure maintenance to prevent equipment failures caused by functional mismatches. Medium and seal compatibility: Nitrile seals are used for conventional mineral hydraulic oils, while fluororubber seals are required for high-temperature, water-based media to enhance durability.

2、 The core rules for the combination and matching of stacked valve groups. Following the basic structure of "bottom plate+functional valve plate+cover plate", all valve plates are stacked in an orderly manner from top to bottom, and bolts are evenly locked to prevent sealing leakage caused by uneven stress. Secondly, the control logic should be arranged in an orderly manner, with pressure control valves, flow control valves, and directional control valves combined as needed. Priority should be given to placing pressure stabilizing and holding valves close to the bottom plate to ensure the stability of the system's basic pressure. Thirdly, the same valve group should avoid functional conflicts, prohibit unreasonable combinations such as reverse pressure regulation and repeated flow limiting, and prevent oil circuit pressure and action interference. Fourthly, for high-frequency working conditions, priority should be given to using upgraded stacked valves with thickened valve bodies and anti fatigue springs to improve the overall stability and service life of the valve group.

3、 Overlay valve mainstream industry application scenarios. 1. Numerical control machine tool equipment: precision machine tools such as lathes, milling machines, and machining centers require high pressure stability and equipment space layout. The integrated leak free characteristics of stacked valves can ensure the machining accuracy of the machine tool. 2. Automated non-standard equipment: automatic chemical equipment, lifting platforms, stamping equipment, etc., can adapt to diverse action control needs through flexible combination of valve plates. 3. Precision injection molding machinery: The opening and closing mechanism and ejection mechanism of the injection molding machine require stable voltage and speed regulation, and the stacking valve can effectively improve the operating accuracy and product qualification rate of the equipment. 4. Small hydraulic workstation: Compact hydraulic stations rely on stacked valves to achieve multifunctional integrated control, with neat and beautiful equipment and convenient operation and maintenance. 5. Light industry and metallurgical equipment: suitable for hydraulic control scenarios with small and medium loads, high precision, and continuous operation, energy-saving, low consumption, and low failure rate.

Reasonable selection and scientific combination of stacked valve groups can leverage the advantages of modular hydraulic systems, improve equipment accuracy, reduce failure rates, and minimize operation and maintenance costs. This is the key to optimizing and upgrading precision hydraulic equipment.