Poppet valve

1、 Working principle: Lift valve

Poppet valve, also known as flat push valve, is a cylinder lift valve. Compressed air enters the air source processing element, undergoes water separation filtration, pressure reduction, and lubricating oil treatment, and then dry, clean, and lubricated air with a certain pressure enters the cylinder through the solenoid valve. The solenoid valve receives signals from the electrical control cabinet, controls the action of the cylinder, and realizes automation processes such as cold air, ash unloading, offline ash cleaning, and return air conversion

• Opening process: The driving device (manual, electric, pneumatic, etc.) drives the valve stem to move upward, causing the valve disc to detach from the valve seat and form a fluid channel. The lifting height of the valve disc determines the flow rate and achieves flow regulation.

 

• Closing process: The valve stem moves downward, the valve disc presses against the valve seat, and the flow path is cut off. Sealing relies on the tight contact between the valve disc and the valve seat, and some designs utilize fluid pressure to enhance sealing (self sealing effect).

2、 Core structure

• Valve body: Main structure, including fluid channels.
• Valve disc (valve core): usually conical, flat or spherical, it cooperates with the valve seat to achieve sealing.
• Valve stem: connects the driving device and valve disc to transmit power.

• Valve seat: The sealing surface that comes into contact with the valve disc, and the material is selected according to the working conditions (such as metal or rubber).
• Drive device: manual (handwheel), automatic (electric/pneumatic actuator), etc.

3、 Types and Applications

• Poppet Valve: A lift valve used to regulate flow and opening/closing, with high sealing but significant pressure drop, suitable for steam and chemical pipelines.
• Safety valve/pressure reducing valve: uses the lifting principle to control pressure, and automatically opens to release pressure when overpressure occurs.
• The function of a lift valve: Lift valves are widely used, mainly for cutting off and throttling in pipelines, and can be used to control the flow of various types of fluids such as air, water, steam, various corrosive media, mud, oil, liquid metal, and radioactive media. RTO lift valve, also known as exhaust gas lift damping valve, is one of the key components of rotary regenerative oxidation furnace, mainly used to control the inflow and outflow and switching of airflow. The combination of RTO and lift valve achieves high efficiency and precision in exhaust gas treatment. The lift valve precisely controls the inlet and outlet of gas to assist RTO in completing the cycle of heat storage, release, and blowing, ensuring the efficiency of exhaust gas purification. This combination is resistant to high temperatures, corrosion, and has superior sealing performance. Effectively prevent the leakage of pollutants. At present, the variety and quantity of lift valves are still expanding, and are developing towards high temperature, high pressure, large diameter, high sealing performance, long service life, excellent regulating characteristics, as well as one valve multifunctionality. Its reliability and other performance indicators have reached a high level.

4、 Characteristics

• Advantages: Good sealing, precise flow regulation, quick opening and closing, easy maintenance.
• Disadvantages: High flow resistance (especially for globe valves), easy wear of valve discs (for high flow rates or media containing particles).
• Flow direction: Usually requires fluid to flow from below the valve disc, using pressure assisted sealing (such as globe valves).
• Material: For high-temperature/corrosive media, corrosion-resistant alloys or ceramic coatings should be selected.
• Drive mode: The automatic actuator is suitable for remote control or high-frequency operation scenarios.

5、 Maintenance and selection

• Maintenance: Regularly check for valve disc/seat wear, grind or replace as necessary.
• Selection criteria: Choose valve type and material based on pressure, temperature, medium characteristics, and flow regulation requirements.

Lift valves are widely used in industrial systems, and their design balances functionality and reliability. Proper selection and maintenance can significantly extend their service life.

 

 

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