SQDL-L15 Series Pneumatic Hydraulic Changeover Valve

SQDL-L15 Series Pneumatic Hydraulic Changeover Valve

In pneumatic-hydraulic hybrid systems-such as those in automated assembly lines, packaging machinery, and material handling equipment-smooth switching between different hydraulic circuits is crucial for coordinating multiple actions. The SQDL-L15 Series Pneumatic Hydraulic Changeover Valve is designed to meet this demand, serving as a key component that controls the on-off and direction of hydraulic oil flow according to pneumatic signals. As a professional hydraulic changeover valve, it integrates pneumatic control and hydraulic switching functions, enabling quick and stable circuit switching without manual operation, which greatly improves the automation level of the system. The SQDL-L15 hydraulic valve is particularly suitable for scenarios requiring frequent circuit switching, such as the clamping and releasing actions of a workpiece fixture, where switching efficiency directly affects production rhythm.​

The SQDL-L15 hydraulic valve stands out in hybrid systems with its ability to achieve fast switching while maintaining stable operation. It adopts a high-sensitivity pneumatic control module, which can complete the switching of hydraulic circuits within 50ms after receiving the pneumatic signal-this speed is 30% faster than traditional manual changeover valves, effectively shortening the action cycle of the equipment. As a hydraulic changeover valve, it uses a precision-machined spool and valve body, with a fit clearance of less than 0.01mm, which minimizes internal leakage to less than 0.05L/min, ensuring that the pressure of the working circuit remains stable during switching.​

Another key advantage of this SQDL-L15 hydraulic valve is its strong anti-interference ability. The pneumatic control part is equipped with a filter and pressure stabilizing device, which can work stably even when the air source pressure fluctuates slightly (±0.1MPa). The valve body is made of high-strength aluminum alloy with anti-oxidation treatment, and the sealing parts use wear-resistant materials, allowing the hydraulic changeover valve to operate reliably in dusty or humid workshop environments, with a service life of more than 10,000 switching cycles.​

• Fast Response Pneumatic Control: The SQDL-L15 hydraulic valve uses a large-flow pneumatic pilot valve, which can drive the spool to move quickly, ensuring that the hydraulic circuit is switched in time to match the rhythm of automated production.​
• Stable Switching Performance: As a hydraulic changeover valve, it is equipped with a buffer structure at both ends of the spool, which reduces the impact of spool movement on the valve body, making the switching process smooth without pressure spikes, protecting downstream hydraulic components.​
• Easy System Integration: The SQDL-L15 hydraulic valve adopts standard installation dimensions and interface specifications, which can be directly connected to the existing pneumatic and hydraulic pipelines of the equipment, reducing the difficulty of system transformation.​
• Visual Switching Status: The valve is equipped with an indicator rod that shows the spool position, allowing operators to intuitively observe the working state of the hydraulic changeover valve, which is convenient for daily inspection and troubleshooting.

SQDL-L15 series pneumatic control valves are developed on SQDL-L15 manual control valves. It changed the control way of these valves, especially, it can be controlled by remote control with the pneumatic control way. The power beyond function is on the SQDL-L15 series, it is able to be connected with other hydraulic valves in series. The features of SQDL-L15 pneumatic control valves are compact construction, high working pressure, better functions, reliable working, remote controlling and etc. Besides that, the manual control can be used with the pneumatic control together. The valves are widely used on mechanical machines, sanitation machines, mining machines and other machines' hydraulic systems.

1. Inner check valve: The check valve inside the valve body is to insure the hydraulic oil will not be returned.

2. Inner relief valve: The relief valve inside the valve body is able to adjust the hydraulic system working pressure.

3. Oil way: Parallel circuit, with power beyond.

4. Control Way: pneumatic control, manual control

5. Valve construction: sectional construction, 1-10 levers are available to assembled as you requests.

6. Spool Function: O,A,Y etc.

7. Options of valves: The overload valves and make-up valve can be fitted on the two ends of the valve body.

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