Sanitary valves its smooth, seamless, automatic evacuation of the craft fluid channel is also very suitable for steam to step on it in situ cleaning needs, sanitary valve connections can be selected according to the conditions of threaded, flanged, welded, clamp, ferrule and other forms; sanitary valves in the manufacturing process in strict accordance with the requirements of the FDA for the quality of the control, sanitary valves using computerized three-dimensional design is made for the requirements of the GMP.
- sanitary valve maintenance and installation of the use of attention points
- Sanitary valves should be placed in a dry and ventilated room, the two ends of the diameter should be sealed dust;.
- Long-term storage should be regularly inspected, and in the processing of the surface coated with oil to prevent rust and corrosion.
- Sanitary valves should be carefully checked before installation of signs and use of the requirements of conformity.
- Installation should be cleaned cavity and sealing surface, check whether the packing is tight, connecting bolts are evenly tightened.
- Sanitary valves should be installed in accordance with the allowable working position, but must pay attention to the maintenance and operation of the convenience.
- In use, can not be partially opened to regulate the flow of sanitary gate valve, so as to avoid damage to the sealing surface in the media flow rate is higher, it is appropriate to fully open or fully closed;.
- Rotate the handwheel when opening or closing, should not be used with the help of other auxiliary levers.
- Transmission parts should be regularly lubricated with oil; sanitary valves should be used frequently in the rotating part of the oil injection, valve stem trapezoidal threaded part of the oil coating
- After installation should be regularly overhauled, clear the inner cavity of the dirt, check the sealing surface, stem nut wear and tear.
- There should be a set of scientific and correct installation operation standards, maintenance should be carried out sealing performance experiments, and make detailed records for inspection.
- other precautions:
- Sanitary valves should generally be positioned before piping installation. Piping should be natural, the position is not right can not be hard wrench, so as not to leave pre-stress;
- Low-temperature sanitary valves should try to do the opening and closing test in the cold state (such as in liquid nitrogen) before positioning, and require flexibility without jamming;
- liquid valve should be configured into the stem and the level of 10 ° inclined angle, to avoid the liquid flow along the stem, cold loss increased; more importantly, to avoid the liquid touching the packing sealing surface, so that it is cold and hard and lose sealing effect, resulting in leakage;
- sanitary safety valve connection should be elbow, to avoid direct impact on the sanitary valve; in addition to ensure that the sanitary safety valve does not frost, so as to avoid failure at work;
- Sanitary globe valve should be installed so that the medium flow direction and the valve body marked with the same arrow, so that the sanitary valve closure pressure on the cone at the top of the valve, and the packing is not loaded. However, the infrequent opening and closing and the need to strictly ensure that no leakage in the closed state of the sanitary valve (such as heating valve), can be consciously anti-loading, in order to make it tightly closed with the help of medium pressure;
- large size sanitary gate valve, pneumatic sanitary adjustment valve should be installed vertically, so as not to bias the spool to one side due to the greater self-weight of the spool, increasing the mechanical wear between the spool and the liner, resulting in leakage;
- When tightening the compression screws, sanitary valves should be in a slightly open state, so as not to crush the valve top sealing surface;
- All sanitary valves in place, should be made again to open and close, flexible without jamming phenomenon is qualified;
- large air separation tower in the bare cold, in the cold state of connecting the sanitary valve flange pre-tightened once, to prevent room temperature does not leak and leakage occurs in the low temperature phenomenon;
- is strictly prohibited in the installation of the valve stem as scaffolding climbing
- 200 ℃ above the high temperature sanitary valves, due to installation at room temperature, and after normal use, the temperature rises, the bolt thermal expansion, the gap increases, so it must be tightened again, called the "hot tight", the operator should pay attention to this work, otherwise leakage is likely to occur.
- when the weather is cold, the water valve is closed for a long time, should be excluded from the water behind the valve. Steam valve after stopping the steam, but also to exclude condensate. The bottom of the valve, such as silk plug, it can be opened to drain.
- non-metallic sanitary valves, some hard and brittle, some low strength, operation, open and close the force can not be too large, especially not to make violent. Also pay attention to avoid object knocking.
- the use of new valves, the packing should not be pressed too tightly, in order not to leak to the extent that the valve stem is under too much pressure to avoid accelerated wear and tear, and opening and closing laborious.
- operation system and operation site
- When carrying out construction, the construction contractor, the safety authority, the plant production department and the construction unit should be fully coordinated in order to clarify the scope of responsibility for the operation.
- The full-time responsible persons are to work on-site in their respective areas of operational responsibility.
- When dismantling or installing sanitary valves, the first to be affected by such operations within a certain range of daily production to make appropriate changes and arrangements, and to remove and cut off the medium in the pipeline.
- In the work site should ensure that the necessary work site.
- In the work site should be set up with the weight of the sanitary valve appropriate support, in order to prevent the sanitary valve sinking and piping center offset.
- After the end of the operation, the pressure resistance test, air tightness test, non-destructive inspection and other inspection items to be prepared.