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brass angle valve
High Angle type globe valveCut-off valves open and close the valve parts are plug-shaped flap, seal appear before plane or cone, the valve flap to make a straight line along the center line of fluid motion. Stem movement forms, lifting rod (stem lift, hand wheel does not lift), but also movements rotating rod (hand wheel rotation, together with the valve stem movements nut located in the valve body above). Cut-off valve is only applicable to full-and full-off, are not allowed to make adjustments and cut expenditure. Cut-off valve sealed valves are mandatory, so the valve is closed, we must put pressure on the valve flap in order to force the sealing surface does not leak. When the medium from the bottom flap valve into the valve 6:00, the operation force required to overcome resistance, is the stem and the packing of the friction force and the pressure from the media generated thrust force off the valve to open the valve than the force, Therefore, stem diameter should be large, otherwise it will stem the top corner of the failures occurred. In recent years, from the emergence of a self-sealing valve, globe valve replaced by medium flow on the top of the flap valve into the valve chamber, when the pressure in the medium under the action of the force off valve is small, and open the valve force, stem diameter can be reduced accordingly. At the same time, the role of the media, this form of valve is also more rigorous. China Valves "three to" have the provisions of the flow of cut-off valve should be used throughout from top to bottom. Cut-off valve is open, the valve flap opening height for the nominal diameter of 25% to 30%, the flow has reached the maximum that the valve has reached fully open position. Therefore, cut-off valve fully open position, the trip should be to determine the valve flap.
brass angle valve