Stainless steel globe valve is a kind of globe valve, English name:stop valve, Globe Valve. The stainless steel globe valve has relatively high requirements on the material of the valve body. Generally, there are several material options such as 301.304.316. Widely used in chemical industry, shipbuilding, medicine, food machinery and other industries. Stainless steel globe valves are divided into three categories: manual stainless steel globe valves, pneumatic stainless steel globe valves, and electric stainless steel globe valves.
Stainless steel globe valveThe opening and closing part of the valve is a plug-shaped valve disc, the sealing surface is flat or conical, and the valve disc moves linearly along the center line of the fluid.StemThe movement form, (common name: dark rod), also has lifting and rotating rod type, (common name: bright rod)Shut-off valveIt is only suitable for full opening and full closing, and adjustment and throttling are not allowed.
The stainless steel globe valve is a forced sealing valve. When the valve is closed, pressure must be applied to the disc to force the sealing surface not to leak. When the medium enters the valve from under the disc, the resistance that the operating force needs to overcome, the friction from the valve stem and packing and the thrust generated by the pressure of the medium, the force to close the valve is greater than the force to open the valve, so the valve stem The diameter of the valve must be large, otherwise the failure of the valve stem to bend will occur. In recent years, since the emergence of self-sealing valves, the flow direction of the medium of the globe valve has changed from the top of the disc to the valve cavity. The diameter can be reduced accordingly. my country’s valve “three modernizations” stipulates that the flow direction of the cut-off valve should be top-down. The valve should be installed horizontally and at the same time, under the action of the medium, this type of valve is also tighter.
When the stainless steel globe valve is opened,DiscOpening height, when at nominal diameter25%~30%When the flow rate has reached the maximum, its meaning means that the valve has reached the fully open position. Therefore, the fully open position of the stop valve should be determined by the stroke of the disc.
The above content introduces the meaning and structure of the stainless steel globe valve. I hope it will be helpful to you after reading it.