For the valve, not only will install and maintain, but also to operate, so what are the correct operation of the valve?
Opening and closing a valve, manual:
1> manual valve is the most widely used valve, hand wheel or handle it, is in accordance with the ordinary human design, considering the surface of the strength and the necessary closing force seal. Therefore can not be a long long lever or wrench to board action. Some people are accustomed to using the wrench, should pay strict attention, do not force too much too fast, or easy to damage the sealing surface, or the board off handwheel, handle.
2> open and close the valve, force should be smooth, not shock. Some of the impact of each component of the high-pressure valve opening and closing this impact has been considered and the general valve can not wait gang.
3> for the steam valve, open the front, should be pre-heated, and the exclusion of condensation water, turned on, should try to move slowly to avoid water hammer.
4> when the valve is fully open, the valve should be hand wheel reverse a little, so tight between threads, so as not to loose damage. For rising stem valve stem, remember the full open and full closed position, to avoid the full impact of top dead center. And easy to check whether the normal closed. If running off valve, or valve seal between the debris embedded in a larger, full closed position of the valve stem to change.
5> lines beginning with, the internal dirt more, the valve can be opened slightly, using high-speed flow of medium, be washed away, and then gently close ( not soon closed, Meng closed, to prevent residual impurities crush sealing surface ), open again, so repeated several times, wash the dirt, and then into the normal work. Dedecms.com
6> normally open valve, electromagnetic valve sealing surface may be sticky with dirt, using the method of closure should be washed away, and then officially closed.
7> such as handwheel, handle damaged or lost, shall be immediately filled, can not be replaced with active wrench, so as not to damage the stem square, start up and shut down, resulting in an accident in production.
8> some of the media, the cooling valve closed, the valve contraction, the operator should be closed at an appropriate time to time, so that the sealing surface without leaving slit, otherwise, butterfly valve media from the high-speed flow through the slit, it is easy to seal erosion surface.
The 9> operation, such as found in operation too difficult, should analyze the reasons. If the packing too tight, may be appropriate to relax, such as stem skew, repair personnel should be notified. Some of the valve, in closed state, close to thermal expansion, resulting in open problems; like to be open at this time, the check valve cover screw loose half circle to circle, remove the stem stress, and then board the hand wheel.
Two, the matters needing attention:
High temperature valve℃1>200, as in the normal installation, and after normal use, temperature, thermal expansion bolts, the gap increased, so must be tightened again, called " hot ", the operator should pay attention to this work, otherwise easy leakage.
2> when the weather is cold, valve water long-closed stop valve, the valve should remove stagnant water. Valve steam stop, it should exclude condensate. The end of like a plug valve, open the drain it can be.
3> non-metallic valves, some hard and brittle, and some low intensity, operation, opening and closing force can not be too high, especially not to Meng jin. Also note that the provision of free objects. Dedecms.com
4> the new valve used, not the weight of packing too tight, not leakage, to avoid too much pressure on the stem, to speed up the wear and tear, and open and close it.
Finally remind us: some when we in the operation of the valve should pay attention to what is said above, in order to avoid unnecessary problems.
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