The Relationship Between The Diameter Of Stainless Steel Valves And The Flow Rate Of The Medium

The flow rate and flow velocity of 3 Way Ball Valve mainly depend on the diameter of the stainless steel valve, and are also related to the resistance of the stainless steel valve structure to the medium. At the same time, it has a certain internal connection with the pressure, temperature and medium concentration of the stainless steel valve.

The flow area of ​​the stainless steel valve is directly related to the flow velocity and flow rate, and the flow velocity and flow rate are two interdependent quantities. When the flow rate is stable, the flow velocity is large, the flow area can be smaller; the flow velocity is small, the flow area can be larger. On the contrary, the flow area is large, the flow velocity is small; the flow area is small, the flow velocity is large. The flow velocity of the medium is large, the diameter of the stainless steel valve can be smaller, but the resistance loss is large, and the stainless steel valve is easy to be damaged. The high flow velocity will cause electrostatic effect on flammable and explosive media, causing damage; the flow velocity is too small, the efficiency is low, and it is not economical. For media with high viscosity and explosiveness, a smaller flow velocity should be taken. The flow velocity of oil and liquids with high viscosity is selected according to the viscosity, generally 0.1~2m/s.

Under normal circumstances, the flow rate is known and the flow velocity can be determined by experience. The nominal diameter of the stainless steel valve can be calculated by the flow velocity and flow rate. The stainless steel valve has the same diameter, but its structural type is different, and the resistance of the fluid is also different. Under the same conditions, the larger the resistance coefficient of the stainless steel valve, the more the flow velocity and flow rate of the fluid through the stainless steel valve will decrease; the smaller the resistance coefficient of the stainless steel valve, the less the flow velocity and flow rate of the fluid through the stainless steel valve will decrease.

The unit of DN value is: mm;

The unit of Ρ value is: MPa.

The resistance coefficient of the gate valve is small, only in the range of 0.1 to 1.5;

The resistance coefficient of the gate valve with a large diameter is 0.2 to 0.5;

The resistance coefficient of the reduced gate valve is larger.

The resistance coefficient of the stop valve is much larger than that of the gate valve, usually between 4 and 7.

The resistance coefficient of the Y-type stop valve (direct current type) is the smallest, between 1.5 and 2.

The resistance coefficient of the forged steel stop valve is the largest, even up to 8.

The resistance coefficient of the check valve depends on the structure: the swing check valve is generally about 0.8 to 2, among which the resistance coefficient of the multi-flap swing check valve is relatively large;

The resistance coefficient of the lift check valve is the largest, up to 12.

The resistance coefficient of the plug valve is small, generally about 0.4 to 1.2.

The resistance coefficient of the diaphragm valve is generally around 2.3.

The resistance coefficient of the butterfly valve is small, generally within 0.5.

The resistance coefficient of the ball valve is the smallest, generally around 0.1.

The resistance coefficient of the above stainless steel valve is the value when the stainless steel valve is fully opened.

The selection of the stainless steel valve diameter should take into account the processing accuracy and standard error of the stainless steel valve, as well as the influence of other factors. The stainless steel valve diameter should have a certain margin, generally 15%.