Eternal Hydraulic Controller Air Valve
Control Valve
Air limit valve
The pneumatic limit valve (pneumatic limit valve) is a device used to control the stroke of the cylinder or valve in the pneumatic system and is widely used in the field of industrial automation. Its main function is to limit the range of motion of the cylinder or valve to ensure that the equipment stops at the predetermined position, thereby improving the safety and reliability of the system. The following is a detailed introduction to the pneumatic limit valve:
I. Working principle
The working principle of the pneumatic limit valve is based on the combination of pneumatic control and mechanical limit. The following is its typical working process:
• Air source input: Compressed air enters the pneumatic limit valve through the air source pipeline.
• Stroke control: When the cylinder or valve reaches the preset stroke position, the mechanical device in the limit valve (such as the limit switch or limit guide device) will be triggered to cut off the air source or change the direction of the air flow.
• Stop action: The cylinder or valve stops moving due to the cut-off of the air source and remains in the set position.
• Reset function: In some designs, the pneumatic limit valve can also be reset manually or automatically to restore the initial state.
II. Main functions
• Stroke limitation: Ensure that the cylinder or valve moves within the predetermined stroke to avoid exceeding the safety range.
• Position control: Accurately control the stop position of the equipment and improve the accuracy of automatic control.
• Safety protection: Prevent equipment from being damaged due to too long or too short stroke, and protect the safety of equipment and personnel.
• Signal feedback: Some air limit valves are equipped with limit switches, which can send position signals to the control system to achieve automatic monitoring.
III. Application fields
Air limit valves are widely used in occasions where the stroke of the pneumatic system needs to be accurately controlled. The following are some typical application fields:
• Automobile industry:
• Used for pneumatic fixtures and cylinder positioning on automobile production lines to ensure assembly accuracy.
• Machinery manufacturing:
• Control the stroke of the cylinder in automated equipment to achieve precise processing and assembly.
• Food and beverage industry:
• Control the movement of the cylinder in packaging machinery to ensure packaging quality and efficiency.
• Pharmaceutical industry:
• Used for cylinder control of pharmaceutical production equipment to meet high precision and hygiene requirements.
• Chemical industry:
• Control the opening and closing of pipeline valves to ensure the safe transportation of chemicals.
• Logistics warehousing:
• Control the travel of handling equipment in automated warehouses to improve logistics efficiency.
IV. Common types
• Mechanical limit valve:
• Directly control the travel through mechanical devices (such as limit switches, limit rods).
• The advantages are simple structure and high reliability.
• Electronic limit valve:
• Equipped with electronic sensors and controllers to achieve more precise position control.
• Can be integrated with automated control systems for remote monitoring and adjustment.
• Pneumatic limit valve:
• Use air pressure changes to control the travel, suitable for occasions that require rapid response.
V. Installation and maintenance
• Installation precautions:
• Ensure that the limit valve is installed in a suitable position to avoid external interference.
• Check whether the air source pressure meets the requirements and ensure that the air circuit is connected correctly.
• Regularly check the mechanical parts of the limit valve to ensure that it works properly.
• Maintenance recommendations:
• Regularly clean and lubricate the mechanical parts of the limit valve to prevent wear.
• Check the air circuit sealing to avoid air leakage affecting performance.
• Regularly calibrate the position of the limit valve to ensure its accuracy.
VI. Advantages
• Precise control: It can accurately control the stroke of the cylinder or valve and improve the level of automation.
• Fast response: The pneumatic system has a fast response speed and can quickly complete the stroke control.
• High reliability: The mechanical limit valve has a simple structure and a low failure rate.
• Strong safety: Protect the safety of equipment and personnel through stroke limitation.
VII. Case
For example, in the hydraulic lifting device of a dump truck, the gas limit valve can ensure that the car body stops when it is lifted to a certain angle to prevent excessive lifting from causing damage to the equipment. In the chemical pipeline system, the gas limit valve can control the opening and closing position of the valve to ensure the safety of fluid transportation. In short, the gas limit valve is an important pneumatic control component. It is widely used in the field of industrial automation by accurately controlling the stroke and position, providing important guarantees for the safe operation and efficient production of equipment.
Control Air Valve.PDF
Mode Code
BKQFA-D Proportional control valve
BKQFA-F Proportional control valve
KQFA-A Control valve
KQFD-A-00 Dial control valve
BKQFC-B Proportional control valve
MKQFA-A Slow down control valve
DQFA-A-A Multi-way control gas valve
QXFB-A Air Limit Valve
QXFF-A Air Limit Valve
BHFA-Q20L Proportional Air Controlled Directional Valve
BHFA-Q20L-B Slow drop air control reversing valve
BHFA-Q20B-A Proportional air-controlled directional valve
BHFB-Q20B-B Proportional Air Controlled Directional Valve
BHFC-Q20B-A Proportional air-controlled directional valve
BHFA-Q25L-A Proportional air-controlled lift valve
BHFA-Q32B-A Proportional air-controlled directional valve
BHFA-Q32L-A Proportional air-controlled distribution valve
HXFC-Q15L-A Slow drop air control reversing valve
HXFE-Q25L-A Pneumatic Directional Valve Y Type
ZDLA-Q20L-A Integral Diverter Combination Valve