◆ Kinematic viscosity of the medium is greater than (equal to) 21 square millimeters of water, gas, steam, weak acid, weak alkali, oil, etc.

◆ When the dynamic viscosity of the medium is greater than (equal to) 25 square millimeters per liter, the closing and opening frequency of the valve will be slow.

◆ When the medium is flammable or gas, the explosion-proof valve in a certain series of our company should be used

◆ Freezing prevention measures should be taken when the freezing medium is below 0 degrees Celsius