Ammonia stop valve construction and installation recommendations

Ammonia Shut-off Valve Construction and Installation Suggestions Ammonia shut-off valve is the use of stem lift valve head driven to change the distance between the valve plate and the valve opening and closing control valve, ammonia stop valve is used in chemical production The widest range of truncated valves. Globe valve in the actual production is mainly used for water, steam, compressed air and other piping control, but not suitable for viscosity and easy to crystallize the material. Ammonia stop valve with V-shaped PTFE for the dynamic seal to the packing pressure for the initial seal, with the media pressure and packing sealing performance enhancement, both self-sealing function, without human maintenance, suitable for high pressure pipeline. Ammonia shut-off valves are all provided with an inverted seal, the valve must be fully open when the valve is fully open, so that the inverted seal to increase the life of the filler, especially to ≧ DN200 to advance into the low specifications, the light open the valve, the operation The force is much smaller than the normal valve. Globe valve structure is simple, practical and easy labor-saving, in the regulation of traffic and cut off the channel has a better performance, slow opening and closing rare water hammer phenomenon. Globe valve has the advantages of compact structure and obvious appearance. Hand wheel and valve stem are arranged on the top of the valve. There are threads and stuffing box sealing section in the middle. Liquid ammonia cut-off valve in use to determine the state of the valve opening and closing the main way is to observe the valve stem exposed bonnet height, in order to control the operation of the valve. There may be a gap between the valve stem and the bonnet, which can easily result in media leakage, which can be solved by the packing seal. Small stop valve stem thread located in the valve body, so in use more contact with the media longer, easily corroded by the medium. Ammonia stop valve installation and use, should pay attention to the following two points: 1, the valve should be opened before the leak check to determine whether the valve without leakage defects, stuffing box is no leak defects. 2, stop valve stem operation, such as can not be done by hand, can use a special F wrench instead, but in the F wrench is still not open, do not use the extended wrench forced open and close, in order to avoid damage to the valve or even safety Accident happened.

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