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.

American standard ball valve wedge seal construction. American standard ball valve door 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 itself, compact structure, reliable sealing, simple structure, convenient maintenance, sealing surface and the spherical often in the closed state, not easily be medium erosion, easy operation and maintenance, suitable for water, solvents, acids and gas generally working medium, such as American standard ball valve but also applicable to the working conditions of media, such as oxygen, hydrogen peroxide, methane and ethylene, widely used in various fields. The ball valve body may be integral or modular.

American standard ball valve enterprises need to change the existing production relations to strengthen technical innovation in the face of the increasingly serious homogenization problem, now American standard ball valve gradually in the wireless cycle into the escape of vicious competition. In this severe situation, valve enterprises need to clearly recognize that low-cost, low-technology valve products flooded the market, American standard ball valve not only disrupt the consumer's judgment and purchase desire, American standard ball valve also hinder the mature transition of the valve market. Ball valve manufacturers therefore, if the valve enterprises want to improve the production efficiency must first change the existing production relations, increase the investment in the modern production line, strengthen technical innovation.

American standard ball valve it has a rotation of 90 degrees of action, the plug body is a ball, a circular hole or channel through its axis. Ball valve in the pipeline is mainly used to cut, distribution and change the flow direction of the medium, it only needs to rotate 90 degrees of operation and a small rotation torque can close tight. American standard ball valves are best suited for switching and shut-off valves, but recent developments have designed ball valves for throttling and flow control.