How Electric Globe Valves Work:
An Electric Globe valve is a valve with an electric actuator driving the stem up and down to drive the valve head so as to change the distance between the disc and the seat to achieve open and close control. It is mainly used to cut off or distribute the flow direction in the pipeline Is the chemical production in the use of the widest range of the cut-off valve. The Electric cut-off valve is mainly used in the control of water, steam and Compressed air, but it is not suitable for the material with high viscosity and easy crystallization. In the use of the main way to judge the valve open and close state is to observe the stem exposed to cover height, in order to control the operation of the valve.
Electric Globe Valve Is A New Type Of Valve Widely Used. It Has The Following 7 Advantages:
1. The fluid resistance is small, and its resistance coefficient is equal to the length of pipe section.
2. The utility model has the advantages of simple structure, small volume and lightweight.
3. Tight and reliable, the gate valve sealing surface material widely used plastic, good sealing, in the vacuum system has also been widely used.
4. Easy to operate, open and close quickly, from full open to full close as long as the rotation of 90°, for long-distance control.
5. Maintenance is convenient, gate valve structure is simple, sealing ring is generally active, disassembly and replacement are more convenient.
6. In full open or full closed, the gate and the sealing surface of the valve seat and media isolation, media through, will not cause the erosion of the valve sealing surface.
7. Wide range of application, diameter from small to a few millimeters, large to a few meters, from high vacuum to high pressure can be applied. Ball rotation 90 degrees, in the entrance, the exit should all show the spherical surface, thus cutting off the flow.
When Using Electric Globe Valve, The Following 7 Points Should Be Noted:
1. When the pipeline is used for the first time, there are a lot of dirty things in the interior. The stop valve can be slightly opened, the high-speed flow of the medium can be used to flush it away, and then it can be gently closed (not quickly closed or tightly closed to prevent the residual impurities from damaging the sealing surface) The Electric cut-off Valve is put into normal operation again.
2. Electric globe valve should be opened before the leakage check to determine whether there is no leakage defect valve, stuffing box is no leakage defect.
3. When the electric cut-off valve is fully open, the handwheel should be reversed a little, so that the threads between the tight, so as not to lose damage.
4. Normally open electric cut-off valve, sealing surface may be sticky dirt, closed when also want to use the above method to wash clean, and then formally closed.
5. If the handwheel, handle damage or loss, should be immediately completed, can not be replaced by flexible plate hand, so as to avoid damage to the stem square, opening and closing is not good, resulting in accidents in production.
6. Some media, in the electric globe valve closed after cooling, so that the valve contraction, the operator of the Electric Globe Valve should be closed again at an appropriate time, so that the sealing surface does not leave a slit, otherwise, the media from the Slit high-speed flow, it is easy to erosion sealing surface.
7. When electric globe valve is used in medium-pressure steam pipeline, condensate should be removed before opening, then steam preheating is carried out, the preheating pressure is kept between 0.2 MPA and 0.3 MPA The goal is to avoid sudden changes in temperature and pressure caused by seal damage, stable in a certain state can be adjusted to the required level of pressure.
Post time: Jul-28-2021