As one of the most widely used types of valves, globe valves are not the same as other valves because they typically cause less friction with the sealing surfaces when they are opened and closed, so they are typically used more often than other types of valves Long-term, in addition it can be used in high-pressure or low-pressure environment.
Wenzhou Zhanli Valve Co., Ltd. globe valve closed principle is to rely on valve stem pressure, so that the sealing surface of the valve flap and seat sealing surface close fit, to prevent the flow of media. Globe only one-way media flow, the installation of a directional. Globe valve structure is greater than the gate valve length, while fluid resistance, long-term operation, the sealing reliability is not strong.
Globe valve works metaphor:
We assume that there is a pipe with a cover, the water flows in from the bottom of the pipe and flows out toward the nozzle. The cover of the nozzle is equivalent to the closing piece of the globe valve. If the pipe cover is lifted up by hand, the water flows outwards, Cover the tube cover, the water stops flowing, which is equivalent to the working principle of the globe valve.
Globe valve by rotating the hand wheel, so that the valve stem up and down, driven by the valve for parallel to the direction of the media straight line displacement, to open and close the purpose. Handwheel clockwise rotation, the working medium from the valve under the channel into the at this time, the application of sealing force must be equal to or greater than the sealing surface must be generated than the pressure and the media upward force.
When the valve is open, the valve opening height, 25% to 30% of the nominal diameter, the flow has reached its maximum, indicating that the valve has reached the fully open position. Therefore, the full-stop position of the valve, valve stroke should be determined.