American standard ball valve wedge seal construction. American standard ball valve is provided by the mechanical force of the valve stem, the ball wedge pressure to the seat and seal, so that the valve sealing is not affected by the pipeline pressure difference, in all kinds of working conditions have a reliable guarantee of sealing performance.
American standard ball valve is a kind of valve in the 1950s, in half a century, ball valve has developed into a major valve class. Manual ball valve ball valve is mainly used for cutting off or on the medium, also can be used for fluid regulation and control, American standard ball valve can be more accurate flow regulation and control, and three way ball valve is used for distribution of media and change the flow of media. American standard ball valve is mainly based on the ball valve drive is through the handwheel or handle rotation and named.
American standard ball valve emergency shut-off valve is a hydraulic control valve. It is composed of main valve, throttle valve, guide valve, pressure gauge and other pipe fittings. When the inlet pressure of the main valve is lower than the pressure set by the guide valve, the guide valve is now in the open state, the pressure in the upper cover chamber of the main valve is equal to the outlet pressure of the main valve, there is a pressure difference between the inlet and the outlet, water flows out through the valve mouth from the outlet. When the fire pump start-up, American standard valves or variable frequency pump pressure, more than a pilot valve set pressure, the American standard ball valve is controlled by the main valve import wizard valve pipe pressure, on the spring pressure, pushing down tight, drives the valve core is down, the pilot valve closed, the main valve inlet pressure through the throttle valve is added at this time the main valve on the valve cover cavity, because the disc under downward pressure is greater than the thrust upward, the main valve to close. Please note that the key point is that the inlet pressure of the American standard ball valve is less than the set pressure and the valve is always in the open state, while the inlet pressure is more than the set pressure and the valve is in the closed state.