American Standard flange valve shut-off valve and belong to the same type of valve, the difference in its closure member is a body, the body for rotation around the center line of the body to achieve open, and close a valve. Valve in the pipeline is mainly used for cutting, distribution and change the direction of flow of the medium. Two-piece ball valve, three-valve, a new valve has been widely used in recent years. Name American Standard globe valve design standards BS1873 JIS B2071-2081 structural length ANSI B16.10, JISB2002 pipe flange ANSI B16.5, JIS B2212-2214 butt end size ANSI B16.25 Inspection and Test API598, JIS B2003 Manual Transmission electric, bevel gear move American Standard American Standard shutoff valve shut-off valve in the advantages of the pipeline is mainly used for cutting, distribution and change the direction of flow of the medium. Valve is a new type of valve is widely used in recent years, it has the following advantages: 1. Fluid resistance, its drag coefficient with the same pipe lengths are equal. 2. Simple structure, small size and light weight. 3. Close and reliable valve sealing surface material widely used plastic, sealing, and has also been widely used in the vacuum system. 4. Easy to operate, opening and closing rapidly, from fully open to fully closed as long as the rotation of 90 °, to facilitate remote control. 5. Easy maintenance, simple gate structure, seals are generally activities, the removal replacement is more convenient. 6. When fully open or fully closed, the sealing surface and the dielectric isolation ball and seat, through the media, will not cause erosion of the valve sealing surface. 7. Wide range of applications, from small diameter to a few millimeters to a few meters from high vacuum to high pressure can be applied, when the ball is rotated 90 degrees, in the import and export of office should be fully rendered sphere, thus cutting off the flow. American Standard shutoff valve installation and maintenance considerations American Standard globe valve position can be classified according to their straight-channel, three-way and the right angle. After two valve for dispensing media and change the flow of the medium. Three ball valve installation and maintenance should note the following: 1. To leave the valve handle rotated position. 2. Can not be used as throttling. Ball 3 belt drive mechanism should be installed upright. American Standard valve, American Standard valve works by rotary valve love to make the valve flow or occlusion. Valve switch light, small size, can be made into large-caliber, reliable sealing, simple structure, easy maintenance, and spherical sealing surface often in the closed state, the media can not easily be eroded, in various sectors has been widely used. American Standard cut-off valve is a relatively new type of valve category, it has its own unique structure some advantages, such as switches without friction seal easy to wear, small opening and closing torque. This reduces the actuator with the specifications. With multi-turn actuators can be realized on media regulation and tight cut. Widely used in [wiki] oil [/ wiki], [wiki] Chemical [/ wiki], urban drainage and other demanding cutting conditions. American Standard cut-off valve works A, an open process in the closed position, the valve stem by [wiki] machinery [/ wiki] pressure effect, pressed on the seat. 2 When the handwheel counterclockwise stem the reverse movement, its flat bottom corner to make the ball disengage the seat. 3 stem continues to rise, and the interaction between the valve stem and guide pin spiral groove, so that the ball began to rotate without friction. 4 up to the fully open position, the valve stem to the limit position, the ball rotated to the fully open position. B, when the shutdown process a closed hand wheel clockwise, the stem and the ball began to fall away from the seat starts to rotate. 2 continues to rotate the handwheel stem being embedded in the spiral groove on its role of guide pins, so the stem and gate simultaneously rotated 90 °. 3 is about to close when the brake member is in the valve seat without contact rotated 90 °. The last four laps hand wheel rotation, angular plane mechanically wedge at the bottom of the stem to the oppression of the ball, making it tightly pressed on the seat, to be completely sealed. American Standard structural characteristics of a shut-off valve, open and close without friction. This feature completely solve the traditional [wiki] Valve [/ wiki] due to friction between the sealing surface and affect the sealing problem. 2, the coat structure. For valves installed in the pipe-line inspection and maintenance directly, can effectively reduce plant parking, and reduce costs. 3, single-seat design. Remove the valve due to abnormal pressure in the cavity medium affect the use of safety. 4, low torque design. Special structural design of the stem, just with a little hand can easily open and close the valve. 5, wedge-shaped sealing structure. The valve stem is provided by mechanical force, the ball onto the seat and wedge pressure seal, the valve seal is not affected by changes in pipeline pressure, sealing performance under various conditions have a reliable guarantee. 6, since the structure of the sealing surface clean. When the ball away from the seat tilt, the pipeline fluid along the sealing surface of a sphere through 360 ° uniform, not only eliminates the high velocity of the seat of local erosion, but also washed away the sealing surface accumulations reach self cleaning purposes . Such a valve installed in the pipe to be level