(1) according to the requirements of different ammonia valve has many specifications. Most of the maximum inlet pressure, the minimum inlet pressure of not less than 2.5 times the outlet pressure. Outlet pressure specification more generally, the maximum outlet pressure. (2) should be installed ammonia valve connected to determine whether it is consistent with the joint use of the system phase. Ammonia globe valve with hemispherical connection, by tightening the nut so that the two fit together well. Therefore, please keep the surface clean both hemispheres, to ensure good sealing effect. Before installation can be high pressure gas blowing dust. Teflon and other materials can also be used as a gasket if necessary. (3) ammonia shutoff valve should be forbidden contact with grease, to avoid fire accidents. (4) stop working when the valve should be in the air over the net, then loosen the adjusting screw in order to avoid long-term compressive deformation of elastic components. (5) ammonia shutoff valve should avoid impact vibration, not in contact with corrosive substances. The use of ammonia shutoff valve and precautions with ammonia with shut-off valve is basically the same. However, it should be noted: special valve ammonia is generally not used for other gases. In order to prevent misuse, using a special connection between the mouth and some ammonia valve and cylinder. Such as hydrogen and propane are used thread left, also known as reverse threads, install special attention. 4, [ammonia] advantage shutoff valve - Riverstone valves 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