Valve repair installation considerations

Valve repair, installation quality, directly affect the use of the valve, so must pay careful attention. Oulei Si valve repair factory in Jiangyin finishing five considerations:

(A) the orientation and position of the valve is installed

    Many valve is directional, such as cut-off valve, throttle valve, pressure reducing valves, check valves, etc., if the installed anti-flip, it will affect the results and life (throttle), or simply does not work (such as pressure relief valve), and even dangerous (such as check valves). General valve, direction signs in the body; case no valve works correctly identified.

    About asymmetric cut-off valve of the valve chamber, the fluid to make its bottom-up through the valve port, so that the fluid resistance (determined by the shape), open and effort (due to media pressure upward), after the closure of media pressure filler, ease of maintenance . This is the cut-off valve Why not safe anti-truth. Other valves also have their own characteristics.

    The position of the valve is installed, it must be convenient in operation; installed even if temporary difficulties some, but also for the sake of long-term work of the operator. The best valve handwheel chest Quqi (generally from the operation to floor 1.2 meters), so, opening and closing the valve will save Jin.

    The landing valve hand wheel should be facing up, Do not tilt, to avoid operating awkward. The wall machines rely on the valves of the equipment, but also leaving a the operator standing leeway. To avoid his back operation, especially to acids, alkalis, toxic media, otherwise very safe.

    The gate valve Do not flip (ie hand wheel down), otherwise it would be medium long-term retained in the valve cover space easily corrode the valve stem, and the requirements for certain processes are taboo. Replace the packing at the same time extremely inconvenient.

    Clear shot valve not installed in the ground, otherwise the exposed stem moisture and corrosion.

    Lift check valves installed to ensure the valve flap vertical in order to lift the flexible.

    Swing check valves installed to ensure that its pin level, in order to swing the flexibility.

    Reducing valve installed upright in horizontal pipelines, Do not tilt in all directions.

(B) The valve construction jobs

    Installation and construction must be careful to avoid collision brittle material valve.

    Before installation, a check valve should check specifications for damage identification, particularly for the stem. Also a few turns to see if skewed, because the transport process, most likely to hit the crooked stem. But also to clear the debris in the valve. The lifting of the valve, the rope should not tie the hand wheel or stem, in order to avoid damage to these components, it should flange.

    Valve connected piping, must be cleaned up. Available compressed air to remove iron oxide debris, silt, welding slag and other debris. These sorts of things, is not only easy to scratch the sealing surface of the valve, which large particles of debris (such as welding slag), and also blocked a small valve, render ineffective.

    Install screw valves, pipe thread should seal packing (the line of hemp the leaded oil or Teflon tape), package, do not get the valve to prevent valve memory product, the impact of media circulation.

    Mounting flange valve, pay attention to the symmetrical evenly tighten the bolts. Must be parallel to the valve flange and pipe flange reasonable gap, so as to avoid excessive pressure valve, even cracking. , With particular attention for the brittle material and the strength is not high valve. Valves, pipe welding spot welding, and then close the piece fully open, and then welded shut.

(3) Valve protection facilities

    Some valves need to have external protection, this is the insulation and cold. Plus insulation layer and sometimes associated with hot steam pipeline.

    What kind of valve should insulation or cold, according to production requirements. Principle says, reduce the temperature too much media inside where the valve will affect productivity or frozen valves, you need insulation, the even heat tracing; Where valve nudity, adverse production or cause frost and other undesirable phenomena need to be cold. Insulation material asbestos, slag wool, glass wool, perlite, diatomite, vermiculite, etc.; cold insulation materials such as cork, perlite, foam, plastic. Long-term without water, steam valve must let go of stagnant water, with valve repair equipment preventive maintenance.

(D) valve bypass and instrumentation

    Some valves, in addition to the necessary protection facilities, but also the bypass and instrumentation. Installation of a bypass, easy trap overhaul. Other valves, there are also install bypass. Whether to install the bypass, depending on the valve status, importance and production requirements.

(E) valve packing replacement

    Stock valves, some filler so bad, and some use the media does not match, which need to replace the packing.

    The valve manufacturer does not consider the use of units of one thousand million different media, always filled with stuffing inside ordinary packing, but when used, must let the filler medium.

    Replace the packing, use valve repair tool, pressed into the circle. Each lap joints 45 degrees is appropriate, laps and lap joints are shifted by 180 degrees.

    Packing height to consider the gland continues to compress room, now we allow the gland lower pressure packed chamber proper depth, this depth is generally 10-20% of the total depth of the packed chamber.

    For demanding valves, seamless angle of 30 degrees. The seams between the circle and the circle is offset by 120 degrees.

    In addition to the above fill at, but also according to the specific circumstances, using a rubber O-ring (60 degrees Celsius below the weak base resistance of natural rubber, NBR rubber resistant to oil below 80 degrees Celsius, fluorine rubber resistant to 150 degrees Celsius in a variety of corrosive media) three stacked PTFE ring (200 degrees Celsius or less resistant to corrosive media) nylon bowl ring (resistant to 120 degrees Celsius ammonia, alkali), forming filler. In ordinary asbestos packing outside, packet layer of Teflon tape, can improve the sealing effect, reduce the electrochemical corrosion of the valve stem.

    In compression packing, while rotating the valve stem to keep surroundings uniform, and to prevent too dead tighten the gland to force uniform, not tilted.

 

Through the above description, I hope to help you better use the valve and valve repair.

 

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