Balanced pneumatic globe valve use description
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Release Time：2020-07-24
Balanced pneumatic valve is usually fully open and fully closed. Considering the flow characteristics, globe valves and ball valves have the characteristics of short opening and closing stroke, fast speed, reliable sealing, and small opening and closing static torque. Therefore, both types of products are suitable. However, considering the reliability, the mainstream products are still pneumatic shut-off valves.
Balanced pneumatic stop valveIt is usually fully open and fully closed. Considering the flow characteristics, globe valves and ball valves have the characteristics of short opening and closing stroke, fast speed, reliable sealing, and small opening and closing static torque. Therefore, both types of products are suitable. However, considering the reliability, the mainstream products are still pneumatic shut-off valves.
Balanced pneumatic stop valveThe cylinder is a stereotyped product, which can be divided into single action and double action according to the action mode. The single-acting product is equipped with a return cylinder spring, which has the function of automatically returning when the air is lost, that is, when the air is lost, the cylinder piston (or diaphragm) drives the cylinder push rod to return to the initial position of the cylinder under the action of the spring (stroke Initial position). The double-acting cylinder does not have a return spring, and the push rod must rely on changing the inlet and outlet positions of the cylinder air source. When the air source enters from the upper chamber of the piston, the push rod moves downward. When the air source of the balanced pneumatic stop valve enters from the lower chamber of the piston, the push rod moves upward. Since there is no return spring, the double-acting cylinder has more thrust than the single-acting cylinder of the same diameter, but there is no automatic return function. Obviously, different intake positions will cause the push rod to move in different directions. When the air intake position of the balanced pneumatic stop valve is in the rear cavity of the push rod, the air intake makes the push rod advance, which is called a positive acting cylinder. Conversely, when the intake position is on the same side of the push rod, the intake causes the push rod to retreat, which is called a reaction cylinder. The pneumatic shut-off valve usually uses a single-acting cylinder because it requires a gas loss protection function.
Balanced pneumatic stop valveIt is a forced sealing valve, so when the valve is closed, pressure must be applied to the valve flap to force the sealing surface not to leak. When the medium enters the valve 6 from below the valve disc, the resistance that the operating force needs to overcome is the friction between the valve stem and the packing and the thrust generated by the medium pressure. The force to close the balanced pneumatic stop valve is greater than the force to open the valve, so the diameter of the valve stem should be larger, otherwise, the valve stem will bend. Since the emergence of self-sealing valves, the flow direction of the cut-off valve has changed from above the valve clack to the valve cavity. At this time, under the action of medium pressure, the force to close the valve is very small, and the force to open the valve is very large, and the diameter of the valve stem can be reduced accordingly. At the same time, under the action of the medium, thisBalanced pneumatic stop valveIt's also tighter. China's valve "three in one" has stipulated that the flow direction of the balanced pneumatic stop valve should be from top to bottom.
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