FLOW-LINKED PROPORTIONALLY-CONTROLLED REDUCTION VALVE SYSTEM

摘要

The present invention relates to a flow-linked proportionally-controlled reduction valve system. The flow-linked proportionally-controlled reduction valve system according to the present invention comprises: a main valve; a venturi unit; a main body; a first diaphragm unit; a resilient spring; a pilot valve; and a differential pressure control pilot valve. The main valve includes an inlet and an outlet connected in series on a main pipe in which fluid is supplied, and selectively widens or narrows a passage between the inlet and the outlet according to a difference between pressure in an upper chamber and pressure at the outlet side due to a diaphragm separating the space into the upper chamber communicating with the inlet and a lower chamber communicating with the outlet. The venturi unit includes: a supporting flange projecting from the outlet side of the main valve toward an inner periphery, a venturi formed in the center of the flange, and a pressure hole vertically passing through the center of the venturi. The main body includes a first inlet and a first outlet formed therein and connected to the inlet and outlet of the main valve, respectively, and a sheet unit opening and closing a passage connected to the first inlet and a second outlet. The first diaphragm unit is installed in the main body, and opens or closes the passage by actuating the sheet unit by means of the pressure of the main valve transmitted through the first inlet. The resilient spring is installed on top of the first diaphragm unit, and presses the first diaphragm unit downward. The pilot valve includes a water pressure-type actuator having a second diaphragm installed thereon to operate by means of fluid entering from the main valve, and a piston installed thereon in linkage with the second diaphragm to press the resilient spring. The differential pressure control pilot valve controls the pressure of an upper chamber of the second diaphragm of the pilot valve including the water pressure-type actuator, by opening and closing an auxiliary passage connecting the first inlet and the upper chamber of the second diaphragm by means of a diaphragm having the upper chamber connected to the pressure hole of the venturi unit and having a lower chamber connected to the first outlet.