Dalian pneumatic pump manufacturer, pneumatic diaphragm pump is a new type of conveying machinery with compressed air as power source. It can pump out all kinds of corrosive liquid, granular liquid, high viscosity, volatile, flammable and toxic liquid. It has been put into production, and the product quality is highly praised. The main characteristic of this kind of pump is that it can not only pump flowing liquid, but also transport some fluid medium with particles.

Dalian pneumatic pump factory, the flow can be freely controlled according to the air pressure, the head can be adjusted (0-50m). The pressure of gas source only needs to be greater than 1kg / cm2 to work. Fire and explosion proof. It has all functions of submersible pump, self-priming pump, impurity pump, shield pump and mud pump and many characteristics of conveying machinery. The flow characteristics of diaphragm pump refers to the relationship between the relative flow of medium through the valve and the displacement (relative opening of the valve).

Ideal flow characteristics mainly include straight line, equal percentage (logarithm), parabola and quick opening, while common ideal flow characteristics only include straight line, equal percentage (logarithm) and quick opening. Parabolic flow characteristic is between straight line and equal percentage, which can be replaced by equal percentage characteristic, while quick opening characteristic is mainly used for two position adjustment and program control, so the choice of diaphragm pump characteristic is actually the choice of straight line and equal percentage flow characteristic.

The shape and structure of valve core can be determined by the flow characteristics of diaphragm pump. However, due to their structural characteristics, it is impossible to change the surface shape of the spool to achieve the required flow characteristics. At this time, it can be realized by changing the shape of the feedback cam of the valve positioner. The choice of diaphragm pump is a very meticulous work, which not only needs solid professional theoretical knowledge, but also needs rich practical experience.

Good selection is not only conducive to the PID parameters tuning in the control loop, but also makes the adjusted parameters get better control effect, greatly extending the service life of the diaphragm pump. Diaphragm pump selection should be adapted to local conditions, not invariable, and should be summarized and innovated constantly in the process of practice.