Throttle Industrial Valves is by changing the flow channel section to control the pressure and flow of the fluid, as part of the regulating valve, but because of its structure limitation, no regulating characteristics of regulating valve, so it cannot be used instead of the regulator. As type throttle valve in structure besides open-close part and related parts, are the same as the cut-off valve; Most of the throttle valve opening and closing a cone shape. 1, the characteristics of the throttle Industrial Valves (1) the structure is simple, easy to manufacture and maintenance, the cost is low; (2) the accuracy is not high, not a substitute for regulating valve; (3) cannot be used as block valves, sealing performance requirements; Throttle valve is no special standard, can consult standard globe valve. 2, throttle valve installation and maintenance of (1) the valve operation is frequent, therefore should be installed in the position of easy operation; (2) when installation should pay attention to medium flow direction should be consistent with the flow of valve on. Three type ball valve working principle is as follows: (1) process is in the closed position, sphere subjected to mechanical pressure of the stem, press on the seat. When turn the handwheel counterclockwise, the valve stem is reverse movement, the Angle at the bottom of the plane to make the ball off the seat. Stem continue to ascend, and valve stem guide pin of interaction in the spiral groove, the sphere began to rotate without some friction. Until to the fully open position, the valve stem to limit position, sphere rotation to the full open position. Second, the closing process is closed, rotating the handwheel clockwise, stem began to drop and the ball to leave the seat begin to spin. Continue to rotate the handwheel, the valve stem is embedded in the spiral groove on the role of the guide pin, make the stem and ball rotation at the same time 90 & deg; 。 Is closed, a sphere has been without contact with the valve seat rotated 90 & deg; 。 Hand wheel rotation of the last few laps, stem mechanically wedge Angle at the bottom of the plane to the oppression of a sphere, make its strong pressure on the seat, to completely seal.
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