What is a pneumatic valve used for? How does a pneumatic valve work

Pneumatic valve is an important device for the automation of industrial pipeline system, which is to install a pneumatic actuator on the basis of ordinary valves, and drive the actuator to work through air source pressure. The movement mode of the valve is generally divided into: linear stroke and angular stroke; From the actuator is generally divided into:

Single-acting vs. double-acting. Pneumatic valves realize the functions of valve cut-off, switch-on, adjustment and so on through the output signal, and the general pneumatic valves are equipped with solenoid valves, air source triplets, limit switches, positioners and other accessories used together.

The pneumatic valve positioner is designed and works according to the principle of force balance, and its working principle is designed and worked according to the principle of force balance. When the signal pressure that enters the bellows increases, the lever 2 rotates around the fulcrum, the baffle plate is close to the nozzle, and the back pressure of the nozzle is amplified by the amplifier, and is sent to the air chamber of the film actuator, so that the valve stem moves downward, and drives the feedback rod (pendulum) to rotate around the fulcrum, and the feedback cam (eccentric cam) connected to the same shaft also rotates in the counterclockwise direction, the lever 1 rotates around the fulcrum through the roller, and the feedback spring is stretched, When the tension force of the spring to the lever 2 and the signal pressure acting on the bellows reach the balance of the moment, the instrument reaches the equilibrium state. In this case, a certain signal pressure corresponds to a certain valve position.

The above mode of action is positive, if you want to change the mode of action, just flip the cam, change the A direction to the B direction, etc., you can. The so-called positive acting positioner means that the signal pressure increases, and the output pressure also increases; The so-called reaction positioner means that the signal pressure increases and the output pressure decreases. As long as a positive acting actuator is equipped with a reaction positioner, the action of the reaction actuator can be realized; On the contrary, a reaction actuator can realize the action of a positive acting actuator as long as it is equipped with a reaction positioner.

China pneumatic valve network.

Uses and characteristics.

a. Purpose It is a right-angle rotary structure, which is used with a valve positioner to achieve proportional adjustment; The V-shaped spool is most suitable for various adjustment occasions, with large rated flow coefficient, large adjustable ratio, good sealing effect, zero sensitivity adjustment performance, small size, and can be installed vertically. It is suitable for controlling gas, steam, liquid and other media.

B. Features: It is a quarter-angle rotary structure, which is composed of V-shaped valve body, pneumatic actuator, positioner and other accessories; There is an intrinsic flow characteristic of approximately equal percentage; It adopts double bearing structure, small starting torque, excellent sensitivity and induction speed; Superior shearing ability.

c. The pneumatic piston actuator uses compressed air as the power source, and drives the crank arm to rotate 90 degrees through the movement of the piston to achieve automatic opening and closing of the valve. Its components are: adjusting bolts, actuator boxes, crank arms, cylinder blocks, cylinder shafts, pistons, connecting rods, cardan shafts.

d. The working principle of the pneumatic control valve: the pneumatic control valve is composed of an actuator and a regulating mechanism. The actuator is the thrust part of the regulating valve, which generates the corresponding thrust according to the magnitude of the control signal pressure and pushes the regulating mechanism to act.

The valve body is the regulating part of the pneumatic control valve, which is in direct contact with the regulating medium and regulates the flow of the fluid.

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.

The pneumatic valve is used for interception, switching and adjusting the flow of pipeline medium. The valves on the washing machine are generally solenoid valves.

Pneumatic valves are available for rent.

After understanding the working principle of pneumatic valves and the classification and characteristics of pneumatic valves, what are the functions of pneumatic valves? Next, we will introduce the role of pneumatic valves and the relevant contents of the precautions for the use of pneumatic valves.

Pneumatic valve function:

1. Realize proportional adjustment.

The purpose and characteristics of the pneumatic valve are a quarter-angle rotary structure, which is used in conjunction with the valve positioner to achieve proportional adjustment.

2. Small size and sensitive regulation.

The V-shaped spool is suitable for various adjustment occasions, with large rated flow coefficient, large adjustable ratio, good sealing effect, sensitive adjustment performance, small size, and can be installed vertically.

3. Control medium.

It is suitable for controlling gas, steam, liquid and other media.

Precautions for the use of pneumatic control valves:

1. This valve should be stored in a dry room, and both ends of the passage must be blocked. It is not allowed to be stored in stacks.

2. The control valve for long-term storage should be checked regularly to remove dirt, and anti-rust oil should be coated on each moving part and processing surface to prevent rust.

3. This valve should be installed on the horizontal pipeline, and it is mandatory to install it vertically. The stem is up.

4. It is mandatory to install the medium flow direction indicated by the arrow in the figure.

Through the introduction of the role of pneumatic control valves, the introduction of the working principle of pneumatic control valves and the classification and characteristics of pneumatic control valves, do you have more understanding and understanding of pneumatic control valves.

How does a pneumatic valve work

Pneumatic valves are mainly used in: petrochemical, pharmaceutical, fertilizer and other chemical industries with explosion-proof requirements. So, how does a pneumatic valve work?

The working principle of pneumatic valves is as follows:

There is a closed cavity in the pneumatic solenoid valve, and there are through holes in the socks at different positions, and each hole of the pneumatic solenoid valve leads to a different oil pipe.

In the middle of the cavity is the valve sold as two electromagnets on both sides, and the magnet coil on which side is energized will be attracted to which side.

The pneumatic solenoid valve blocks or leaks different oil discharge holes by controlling the movement of the valve body, and the hydraulic oil with the oil inlet hole is normally open will enter the different oil discharge pipes, and then the oil pressure of the pneumatic solenoid valve pushes the oil piston of the oil gang.

In this way, the mechanical movement of the entire solenoid valve is controlled by the current of the solenoid iron that controls the pneumatic solenoid valve.

Working principle: use compressed air to promote the movement of multiple groups of combined pneumatic pistons in the actuator, transmit force to the characteristics of the beam and the inner curve track, drive the hollow core spindle to rotate, and the compressed air disc is transported to each cylinder, change the inlet and outlet position to change the direction of spindle rotation, and adjust the number of cylinder combinations according to the requirements of the rotation torque required by the load (valve) to drive the load (valve) to work.

The two-position five-way solenoid valve is usually used with the double-acting pneumatic actuator, the two-position is controllable: on-off, the five-way is five channels of ventilation, one of which is connected with the air source, two are connected with the air inlet and outlet of the external air chamber of the double-acting cylinder, and two are connected with the air inlet and outlet of the internal air chamber, and the specific working principle can refer to the working principle of the double-acting pneumatic actuator.