Emerson's Fisher Fisher valve installation five key points:
First, direction.
Many valves are directional.
Such as globe valves, throttle valves, pressure reducing valves, check valves, etc. If installed in reverse, it will affect the use effect and service life (e.g., throttle valves), or will not work at all (e.g., pressure reducing valves), or even cause danger (e.g., check valves). Ordinary valves have directional signs on the valve body. If not, it should be correctly identified according to how the valve works.
The valve cavity of the globe valve is asymmetrical, the fluid passes through the valve port from the bottom up, the fluid resistance is small (determined by the shape), the opening is labor-saving (due to the rise in the pressure of the medium), the medium does not compress the filler after closing, and it is easy to check, which is why the globe valve cannot be the opposite. Other valves also have their own characteristics.
The valve must be installed in a position that is easy to operate.
Even if the installation is difficult for the time being, it is necessary to take into account the long-term work of the operator. A good valve handwheel is flush with the chest (generally 1.2 meters from the operating ground), so that it is more labor-saving to open and close the valve. The handwheel of the floor valve should be facing upwards and not inclined to avoid uncoordinated operation. The wall machine is close to the valve of the equipment, and the operator should also be allowed to stand.
Avoid operation with the sky in the sky, especially acids, alkalis and toxic media, otherwise it is not safe.
The gate should not be turned upside down (i.e. the handwheel is down), otherwise the medium will remain in the bonnet space for a long time and easily corrode the valve stem, which is a contraindication for some process requirements. It is extremely inconvenient to change the packing at the same time. Do not install underground, otherwise it will corrode the exposed valve stem due to moisture.
The lift check valve should be installed with a vertical disc so that it can be lifted flexibly. Rotary check valve, the installation should ensure that its pin shaft is level, so that the rotation is flexible. The pressure reducing valve should be installed upright on the horizontal pipe and should not be inclined in all directions.
Second, construction work.
Care should be taken during installation to avoid striking valves made of brittle materials.
Before installing
All valve models and specifications should be carefully inspected for compliance with design requirements.
(Check whether it can be used under the required conditions according to the valve model and factory instructions, and perform a water pressure or air pressure test if necessary.)
In addition, it should be checked that the packing is in good condition, that the gland bolts have sufficient adjustment margin, that the stem and disc are flexible, and that they are not jammed or skewed.
(The sealing surface of the valve disc must be closed tightly, and the valve connecting the threads should check the thread quality.) Unqualified valves cannot be installed and should be stacked or marked separately.
Remove debris from the valve.
Installation process.
When lifting the valve, the rope should not be tied to the handwheel or stem to avoid damage to these parts, and should be tied to the flange.
The pipes to which the valves are connected must be clean.
Iron oxide filings, sediment, welding slag and other debris can be blown away by compressed air. This kind of debris is not only easy to scratch the sealing surface of the valve, but also large particles of debris (such as welding slag) can also block the small valve and make it ineffective.
When installing the screw valve, the sealing packing (linen plus aluminum oil or PTFE raw material belt) should be wrapped on the pipe thread and should not enter the valve, so as to avoid accumulation in the valve and affect the flow of the medium.
When installing the flange valve, attention should be paid to tightening the bolts symmetrically and evenly. The valve flange must be parallel to the pipe flange and the clearance must be reasonable, so as to avoid excessive valve pressure or even cracking. Special attention is paid to brittle materials and valves with low strength. The valve of the welded pipe should be spot welded first, then open and close the part, and then the weld dies.
Third, protective measures.
Some valves also require external protection, i.e. insulation and cooling. Insulation sometimes requires mixing hot steam piping. Which valve should be kept warm or cooled depends on the production requirements.
In principle, if the temperature of the medium in the valve is too low, it will affect the production efficiency or freeze the valve, and it needs to be kept warm or even heated; If the valve is exposed, it is not good for production or undesirable phenomena such as frosting, and insulation is required. Insulation materials include asbestos, slag wool, glass wool, perlite, diatomaceous earth, vermiculite, etc.; Cooling materials include cork, perlite, foam, plastic, etc.
Fourth, bypass and instrumentation.
Some valves have bypasses and instrumentation in addition to the necessary protective facilities. A bypass is installed. It is convenient for the inspection of the drain valve. Bypasses are also installed on other valves. Whether or not to install a bypass depends on the condition, criticality, and production requirements of the valve.
Fifth, replace the packing.
Stock valves, some packing is not easy to use, some do not meet the use of the medium, need to replace the packing.
Valve manufacturers cannot consider using a wide variety of media. Ordinary packing is always filled in a stuffing box, but when used, the packing must be appropriate for the medium.
When changing the filler, it should be pressed in one circle at a time. The seam of each circle should be 45 degrees, and the seam of circles and circles should be 180 degrees. The packing height should take into account the space where the gland continues to be pressed. At present, the pressure packing chamber at the lower part of the gland should have an appropriate depth, which can generally be 10-20% of the total depth of the packing chamber. For demanding valves, the seam angle is 30 degrees. The seams between the circles and the circles are staggered 120 degrees.
In addition to the fillers mentioned above, rubber O-type PTFE rings (natural rubber is resistant to weak alkali below 60 degrees Celsius, nitrile rubber is resistant to oil crystals below 80 degrees Celsius, and fluoroelastomer is resistant to a variety of corrosive media below 150 degrees Celsius), three stacked PTFE rings (resistant to strong corrosive media below 200 degrees Celsius) and other molding fillers can be used according to the specific situation.
Wrapping a layer of PTFE raw meal tape in ordinary asbestos packing can improve the sealing effect and reduce the galvanic corrosion of the valve stem. When pressing the seasoning, the valve stem should be rotated at the same time to keep the surroundings even and prevent excessive death. When tightening the gland, apply even force and do not tilt.
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