In fact, the flow of stainless steel valves depend on the diameter of stainless steel valves.It is also related to the resistance of the stainless steel valve structure to the medium. Meanwhile,it has a certain internal connection with various factors such as the pressure, temperature and medium concentration of the stainless steel valve.
Take API 603 Stainless Steel valve for example, the flow channel area is direct effect flow speed and flow rate of stainless steel valves.The flow rate and flow rate are two interdependent quantities. When the flow is unchanged, the flow speed is high, flow channel area could be smaller, The flow channel area could be larger if the flow speed is slow; If the flow channel area of stainless steel valve is large and the flow velocity is small; the flow channel area is small and the flow velocity is large.
The flow speed of the medium is high, the diameter of the stainless steel valve can be smaller, but the resistance loss is large, stainless steel valves are easilier damaged. High flow rate will produce static effect on flammable and explosive media, causing injury. Flow rate is too small,stainless steel gate valve are low compliance and uneconomical.
General speaking, for the medium with high viscosity and explosive, the flow rate should be smaller.The flow rate of oil and liquid with high viscosity is selected according to the viscosity, say 0.1 to 2 m/s.
When there are required stainless steel globe valve or stainless steel ball valve, clients will offer the flow rate and flow speed. The nominal diameter of the stainless steel valve can be calculated through the flow rate and flow rate.
Same size of stainless steel valve, if different structure, the flow resistance are different.For example, 8 inch stainless steel globe valve, the flow resistance plug disc globe valve and ball disc globe valve are different.The greater the resistance coefficient of the stainless steel valve, the more the flow velocity and flow of the fluid through the stainless steel valve drop.The smaller the resistance coefficient of the stainless steel valve, the less the flow velocity and flow drop of the fluid through the stainless steel valve.
DN(mm)
PN(Mpa)
The resistance coefficient of small size of stainless steel gate valve are small, it is between 0.1 to 1.5; The resistance coefficient of larger size API 603 Gate Valve is about 0.2 to 0.5. And the data of reduced bore gate valve is larger.
The resistance coefficient of API 603 globe valve is much larger than API603 gate valve, it is between 4 to 7. Y type globe valve's is the smallest among straight through globe valve, pressure seal globe valve and API 602 forged steel globe valve. API 602 forged steel globe valve's is the largest, sometimes can reach 8.
The resistance coefficient of check valve depends on their structure. It is 0.8 to 2 for swing check valve; and dual disc check valve is larger. Lift type check valve is largest.
The resistance coefficient of plug valve is 0.4 to 1.2. Diaphram valve is about 2.3, butterfly valve's is about 0.5, ball valve's 0.1, it is small.
The resistance coefficient of the stainless steel valve is the value when the stainless steel valve is fully opened.
When to choose stainless steel valves, you should take processing accuracy, dimensional error and other effect factors into consideration.The diameter of the stainless steel valve depends on the diameter of the process pipeline.
