PLUG VALVE WITH LINEAR FLOW CONTROL AND METHOD FOR DESIGNING THE SAME

摘要

A plug valve with linear flow control and a method for designing the plug valve are disclosed. The plug valve has a valve body and a plug being rotatably inserted into the valve body. The valve body has an air inlet communicated to a through hole formed on the plug. The plug has a flow-regulating slot communicated with an air outlet of the valve body. When the plug rotates, the air outlet of the valve body successively overlaps the flow-regulating slot at a starting position, an adjusting position and an ending position defined along the flow-regulating slot. Where the air outlet of the valve body overlaps the flow-regulating slot at the positions is defined as a venting area. The venting area changes linearly from the starting position, the adjusting position to the ending position. The plug valve therefore provides flow control that is relatively linear.

主权项

1. A method for designing a plug valve with linear flow control, the plug valve having a valve body and a plug being rotatably inserted into the valve body, wherein the valve body has an air inlet communicated to a through hole formed on the plug, and the plug has a flow-regulating slot being communicated to an air outlet of the valve body, the method comprising:
defining a starting position and an ending position for the flow-regulating slot of the plug, and at least one adjusting position between the starting position and the ending position, so that when the plug rotates, the air outlet of the valve body overlaps the flow-regulating slot at the starting position, the adjusting position and the ending position successively, wherein where the air outlet of the valve body overlaps the flow-regulating slot at the starting position, the adjusting position and the ending position of the flow-regulating slot is defined as a venting area, and the venting area linearly changes as it successively corresponds to the starting position, the adjusting position and the ending position.