BJ45H thermal insulation globe valve

The opening and closing part of the heat preservation globe valve is a plug-shaped valve disc, the sealing surface is a plane or a conical surface, and the valve disc moves linearly along the center line of the fluid. The movement form of the valve stem includes a lifting rod type (the valve stem rises and falls, and the handwheel does not rise and fall), and there is also a lifting rotary rod type (the handwheel rotates and lifts together with the valve rod, and the nut is arranged on the valve body). The bellows globe valve is only suitable for fully open and fully closed, no adjustment and throttling are allowed.

 

The working principle of BJ45H insulation globe valve:

The thermal insulation globe valve is a mandatory sealing valve, so when the valve is closed, pressure must be applied to the valve disc to force the sealing surface not to leak. When the medium enters valve six from below the valve disc, the resistance that the operating force needs to overcome is the friction force between the valve stem and the 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 The diameter of the stem should be large, otherwise the failure of the top of the valve stem will occur. In recent years, since the emergence of self-sealing valves, the medium flow direction of the heat preservation globe valve has been changed from the top of the valve disc into the valve cavity. At this time, under the action of the medium pressure, the force to close the valve is small, while the force to open the valve is large, and the valve stem The diameter can be reduced accordingly. At the same time, under the action of the medium, this form of valve is also tighter. my country’s valve “Three Chemicals” once stipulated that the flow direction of the insulation globe valve should be from top to bottom.

When the insulation globe valve is opened, when the opening height of the valve disc is 25% to 30% of the nominal diameter, the flow rate has reached the maximum, indicating that the valve has reached the fully open position. Therefore, the fully open position of the globe valve should be determined by the stroke of the valve disc.

 

The scope of application of BJ45H insulation globe valve:

BJ45H insulation globe valve is suitable for pipelines in chemical and fertilizer industries. The steam contained in the jacket can prevent the medium from crystallizing.

 

【Product application of BJ45H insulation globe valve】
BJ45H, BJ45Y, BJ45W type PN16~PN40 insulation jacketed DC globe valves are mainly used in various systems such as petroleum, chemical industry, metallurgy, and pharmaceuticals to transport high-viscosity media that will solidify at room temperature.

【Execution standard of BJ45H insulation globe valve】
Design and manufacture: BS1873 BS5160 GB12233
Flange size: ANSIB16.5 JB/T79 GB9113
Pressure temperature: ANSIB16.34
Structure length: ANSIB16.10 BS1873 GB12221
Butt welding connection size: ANSIB16.25
Inspection and experiment: BS6755 GB/T13927

 

The main shape and connection size of BJ45H insulation globe valve