Can pneumatic valves be used in water What are pneumatic valves used for?

Which is the best manufacturer of valves in Shanghai? There are many valve manufacturers in Shanghai, specifically which one is the best, in fact, it is very difficult, this depends on where you can evaluate it conveniently, each manufacturer produces different valve products, and the fields involved are also very different, for example, some are doing water systems, some are doing industrial systems, and industrial systems are divided into many fields, such as: electric power, chemical industry, petroleum, pharmaceuticals and many other fields.

Here is a brief introduction to a few companies, Shanghai Qizhong valve in the field of water system, Suzhou Neway valve, Shanghai Guanlong valve this unit is not bad, industrial valve field can also be.

Here are some of the well-known brands recognized in the valve industry, which are widely recognized and have a high reputation. Although the ranking may change due to time and market conditions, the following brands are generally considered to be one of the top brands in the valve industry: water system valves and industrial valves The following more influential first-line brands can be used as a reference, and the following are the top ten domestic first-line valve brand manufacturers in 2022-2023, but for reference only:

Suzhou Neway Valve, Shanghai Guanlong Valve, Shanghai Qizhong Valve, Sanhua, Suyan, 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.

The control system solenoid valve is finished when it sees the water.

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.

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.