วาล์วลูกโลกสแตนเลสสตีล API ร่วม

The valve also called the valve valve is forced closed valve, so the valve is closed, the valve must exert pressure to force the sealing surface does not leak. When the medium into the valve from the bottom of the valve, the operating force required to overcome the resistance, is the stem and the packing friction and pressure generated by the media thrust force than the valve off the valve opening force, so the diameter of the valve stem, otherwise it will bend the stem top of the fault. According to the connection mode is divided into three types: flange connection, threaded connections, welded connections. The emergence of self sealing valve, globe valve replaced by medium flow on the top of the valve into the valve chamber, then in the medium under pressure, the valve off a small force, and force open the valve, stem diameter can be reduced accordingly. At the same time, in the role of the media, this form of valve is also more rigorous. China's valve "three to" has been provided, the flow of the cut-off valve, will be used from top to bottom. When the valve is turned on, the opening height of the disc is 30% to 25% of the nominal diameter. The flow rate has reached the maximum, indicating that the valve has reached the full open position. So the full open position of the valve should be decided by the stroke of the valve.

The cut-off valve (stop valve, Globe Valve) opening and closing parts are plug shaped valve, sealing a plane or above the sea surface, the valve seat along the center line of the straight line. Stem form of exercise (generic name: dark bar), but also lift rotating rod can be used to control air, water, steam, all kinds of corrosive media, mud, oil, metals and radioactive liquid media and other types of fluid flow. Therefore, this type of cut-off valve is very suitable as a cut-off valve and throttle valve. Because of the valve stem to open or close the trip is relatively short, but very reliable cut off function, and because changes in the valve seat and the valve stroke is proportional, is very suitable for flow regulation.