China Pumping Solutions Leader
Diaphragm pumps include pneumatic diaphragm pumps and electric diaphragm pumps
Composition of diaphragm pump
There are four types of combination forms: positive and positive (gas close type), positive and negative (gas open type), anyway (gas open type), inverse (gas close type)
Considerations: a) process production safety; b) Characteristics of the medium; c) Ensure product quality and minimize economic losses.
Flow characteristics of diaphragm pump
The flow characteristics of the diaphragm pump refers to the relationship between the relative flow of the medium through the valve and the displacement (relative opening of the valve), and the ideal flow characteristics are mainly linear, equal percentage (logarithm), parabola and fast opening. Commonly used ideal flow characteristics are only straight line, equal percentage (logarithm), fast opening three.
Specific considerations from the following aspects:
① Analyze and select the adjustment quality of the adjustment system;
② Consider from the process piping situation;
③ From the load change analysis.
Diaphragm pump selection method
Valve body type is the most important link in the selection of diaphragm pump. There are many types of diaphragm pump valve bodies.
(1) The spool shape structure is mainly considered according to the selected flow characteristics and unbalance force.
(2) Wear resistance: when the fluid medium is a suspension containing a high concentration of wear particles.
(3) Corrosion resistance: Because the medium is corrosive, in the case of meeting the adjustment function, try to choose a simple valve structure.
(4) the temperature and pressure of the medium: when the temperature and pressure of the medium are high and the change is large, the valve core and the material of the valve seat should be selected with small changes in temperature and pressure.
2, diaphragm pump selection
(1) Consideration of output force
Regardless of the type of actuator, its output force is effective for overcoming the load (mainly refers to the unbalanced force and unbalanced moment plus the role of friction, sealing force, gravity and other related forces).
