BJ41W insulation globe valve is a forced seal valve, so when the valve is closed, pressure needs to be applied to the disc to force the sealing surface not to leak. When the medium from the lower part of the valve disc into valve six, the operating force needs to overcome the resistance, is the friction of the valve stem and packing force and by the pressure of the medium produced by the thrust, the force of closing the valve than the force of opening the valve, so the diameter of the valve stem to be large, otherwise the failure of stem bending will occur. In recent years, from the appearance of self-sealing valve, the flow of the globe valve medium into the valve cavity by the upper part of the disc, then in the medium pressure, the force of closing the valve is small, and the force of opening the valve is large, the diameter of the valve stem can be reduced accordingly. At the same time, in the medium action, this form of valve is also more stringent. Our country valve "3 change to give" once stipulated, the direction of globe valve, all adopt top down.
When the insulation globe valve is opened, the opening height of the disc is 25% ~ 30% of the nominal diameter, the flow rate is large, indicating that the valve has reached the full open position. Therefore, the full open position of the globe valve should be determined by the stroke of the disc.
LPG globe valve types according to the position of the valve stem screw type, screw type. According to the flow direction of the medium, there are straight, straight and Angle. Globe valves by sealing type, there are packing seal globe valves and bellows seal globe valves.
Note: parameters are for reference only, or incomplete. Valves can be selected according to the requirements of different pressure, material, diameter, driving mode. Please contact us by phone or online.
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