Limit Valve

Hydraulic system limit valve is a core control component used to limit the stroke position of the actuator (cylinder/motor). Through mechanical triggering or hydraulic induction, it automatically cuts off or adjusts the hydraulic oil flow when the actuator reaches the preset position, achieving precise positioning and safe limit of moving parts. It combines position detection, action switching, and overload protection functions, and is widely used in construction machinery, automated production lines, and hydraulic equipment. It is a key component to ensure the accuracy and safety of hydraulic system actions.

Product Details

Function

Travel limit: detect the position of the actuator and trigger action switching (such as reversing, pressure relief)

Position locking

limiting the range of motion to prevent damage caused by overtravel

Overload protection

Automatic pressure relief in case of overtravel to avoid mechanical structure overload

Diameter

6mm to 25mm

Rated pressure

16-35 MPa

Limit accuracy

≤± 0.5 mm (mechanical trigger type), ≤± 1.5 mm (hydraulic induction type)

Response time

≤ 10 ms (mechanical trigger), ≤ 30 ms (hydraulic induction)

Control mode

mechanical collision block triggering, hydraulic pressure induction, electromagnetic signal control

Protection level

IP65 (valve body), IP67 (sensor module)

Technical advantages and features

(1) Double limit mechanism

Mechanical hard limit: Built in adjustable collision block structure, limit error ≤ ± 0.3 mm, can withstand 5000N impact force (such as injection molding machine mold closing limit);

Hydraulic soft limit: The pressure sensing valve core automatically releases pressure when overtravel, with a response time of ≤ 15 ms to avoid rigid impact.

(2) High precision position control

Adopting magnetostrictive displacement sensors (accuracy ± 0.1 mm), combined with electro-hydraulic proportional valves to achieve closed-loop control, with a repeat positioning accuracy of ≤± 0.5 mm (applicable to machine tool worktable limit);

The collision block adjustment range of the mechanically triggered limit valve is 0-100 mm, suitable for different stroke requirements.

(3) Anti impact and long-life design

The valve core is made of 27SiMn alloy and plated with hard chromium (thickness 20 μ m), with a resistance to impact of ≥ 500000 times (triggered 1000 times a day for 14 years);

The sealing system adopts a polyurethane+metal skeleton composite structure, with a leakage rate of ≤ 3 drops/minute, suitable for high-frequency action scenarios.

(4) Intelligent integration and monitoring

Integrated CANopen bus interface, real-time upload of limit position and pressure data, triggering sound and light alarms in case of abnormalities (response time ≤ 50 ms);

Support remote setting of limit points (through HMI human-machine interface), adapted to the needs of fast switching between multiple working conditions.

(5) Full environmental adaptability

Temperature resistance -40 ℃~+80 ℃, response time ≤ 20 ms in -20 ℃ environment;

Anti vibration performance up to 50Hz, 30g acceleration (ISO 16750 standard), suitable for bumpy construction machinery