What are the possible factors for the slow movement of pneumatic actuators

The reason for the slow action of the pneumatic control valve is mainly caused by the unbalanced change of torque. The essence of the pneumatic control valve is a pressure balance device, the pneumatic control valve achieves a balance between the pressure and the pressure of the spring through the instrument wind acting on the diaphragm when the opening is stable, and the actuator of the pneumatic control valve drives the torque of the valve stem to move up and down and the pressure of the medium acting on the core of the pneumatic control valve to balance.

If the control room wants to change the opening of the control valve, it is essentially breaking the balance of the original control point and maintaining the balance on the new control point. If the position of the balance point is changed, the unbalanced force will be greater, and the torque of the balance point will be changed, and the greater the action distance of the valve stem of the pneumatic control valve per unit time. That is, the faster the opening and closing of the control valve.

If a pneumatic control valve that previously acted quickly suddenly slowed down or unilaterally slowed down, then it is necessary to find out the reason, Yuanfeng valve industry summarized above, mainly the following points:

1.The stem is sluggish only when acting in one direction.

Diaphragm damage and leakage in pneumatic film actuator;

Leakage of type "O" seal in the actuator.

2.The valve stem is sluggish when it reciprocates.

There is sticky blockage in the valve body;

PTFE filler deteriorates and hardens or graphite-asbestos filler lubricating oil drying;

If the filler is added too tightly, the friction resistance increases;

High frictional resistance due to the non-straight stem;

Pneumatic control valves without positioners can also lead to sluggish action.

Here are some of the well-known brands recognized in the valve industry, which are widely recognized and have a high reputation. While rankings may vary depending on time and market conditions, the following brands are generally considered to be among the top brands in the valve industry:

The following influential first-line brands of water system valves and industrial valves can be used as a reference, but for reference only: Suzhou Neway Valve, Shanghai Guanlong Valve, Shanghai Qizhong Valve, Sanhua, Chaoda, Shentong, Su Valve, Nanfang, Jiang.

First, the word Yao. The above manufacturers are only estimates and references, and the specific situation may vary or fluctuate at any time due to changes in a series of factors such as changes in the market, the size of the competition pattern, and the stability of product quality. As an indispensable key device in industrial production and civil facilities, the quality and reputation of the valve brand directly affect the satisfaction and trust of users.

These brands are known in the valve industry for their innovative technology, high-quality products and reliability. It is important to note that the market and industry are evolving rapidly, and different rankings may vary depending on time and region. For the most up-to-date ranking information, it is recommended to refer to industry reports, professional organizations or market research data for more detailed and accurate information.

Summary. The reason for the sluggish action of the pneumatic actuator is mainly caused by the unbalanced change of torque.

The reason for the sluggish action of the pneumatic actuator is mainly caused by the unbalanced change of torque.

The essence of the pneumatic control valve is a pressure balance device, the pneumatic control valve is balanced by the pressure of the instrument wind acting on the diaphragm and the pressure of the spring when the degree of opening and collapse is stable, and the pneumatic control valve actuator actuator drives the torque of the valve stem to move up and down and the pressure of the medium acting on the spool of the gas control valve to balance.

If the control room wants to change the opening of the control valve, it is essentially breaking the balance of the original control point and maintaining the balance at the new control point. The process of moving at one equilibrium point is the time required for the valve to act, if the position of the equilibrium point is changed, the greater the unbalanced force, the greater the torque change at the equilibrium point, and the greater the action distance of the stem of the pneumatic control valve per unit time. That is, the faster the opening and closing of the control valve.

If the control room wants to change the opening of the control valve, it is essentially breaking the balance of the original control point and maintaining the balance at the new control point. The process of moving at one equilibrium point is the time required for the valve to act, if the position of the equilibrium point is changed, the greater the unbalanced force, the greater the torque change at the equilibrium point, and the greater the action distance of the stem of the pneumatic control valve per unit time. That is, the faster the opening and closing of the control valve.

If a pneumatic control valve that previously acted quickly suddenly moved sluggishly or unilaterally slowed, then it is necessary to find out the reason, Yuanfeng valve industry summary of the potato on the main points: 1The stem is sluggish only when acting in one direction.

Diaphragm damage and leakage in pneumatic film actuator; Leakage of type "O" seal in the actuator. 2.The valve stem is sluggish when it reciprocates.

There is sticky blockage in the valve body; PTFE filler deteriorates and hardens or graphite-asbestos filler lubricating oil drying; If the filler is added too tightly, the friction resistance increases; High frictional resistance due to the non-straight stem; Pneumatic control valves without positioners can also lead to sluggish hailstorms.

1. Accept continuous gas signal, output linear displacement (after adding electric gas conversion device, can also accept continuous electrical signal), and some can output angular displacement after matching rocker arm.

2. It has positive and negative functions.

3. The moving speed is large, but the speed will slow down when the load increases.

4. The output force is related to the operating pressure.

5. The reliability is high, but the valve cannot be maintained after the air source is interrupted (it can be maintained after adding the position protection valve).

6. It is inconvenient to realize segmented control and program control.

7. Simple maintenance and good adaptability to the environment.

8. The output power is large.

9. It has explosion-proof function. The control accuracy is low, and the double-acting pneumatic actuator cannot return to the preset position after the air source is cut off. Single-acting pneumatic actuator that can be returned to the preset position by spring after the air supply is cut off.