Forged Steel Flange Globe Valve Pressure Seal 2500lb

Pressure Seal Globe Valve 2500lb is a forced 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 the valve from below the valve clack, the resistance to be overcome by the operating force is the friction between the valve stem and the packing and the thrust generated by the pressure of the medium. The force to close Pressure Seal Globe Valve 2500lb is greater than the force to open the valve, so the diameter of the valve stem must be larger, otherwise the valve stem will bend. In recent years, since the appearance of the self sealing valve, the flow direction of the medium has changed from the upper part of the valve disc to the valve chamber. At this time, under the effect of the medium pressure, the force to close the valve is small, while the force to open the valve is large, and the diameter of the valve stem can be reduced accordingly. At the same time, under the action of medium, this type of valve is also tight. The flow direction of Pressure Seal Globe Valve 2500lb in China, as stipulated in the "three chemical supplies", is from top to bottom· When the stop valve is opened, when the opening height of the valve clack is 25%~30% of the nominal diameter, the flow has reached a large value, indicating that the valve has reached the full open position. Therefore, the fully open position is determined by the stroke of the valve disc· The reason why the stop valve is popular is that the friction between sealing surfaces is small during opening and closing, it is durable, the opening height is not large, it is easy to manufacture, and it is convenient to maintain. It is not only suitable for medium and low pressure, but also for high pressure· The valve only allows one-way flow of medium, and has directivity during installation. The structure length is longer than the Gate Valve, and the fluid resistance is large, so the sealing reliability is not strong during long-term operation.