Patent ID: 6820641
Filing Date: 2004-11-23
Classification: F16K,G05D,Y10T

Abstract:
A pilot dome loaded regulator, comprising a regulator housing having a high pressure inlet, a low pressure outlet, a control chamber, a pilot chamber, a main valve bore having the inlet opening thereto and opening to the control chamber, a pilot valve bore opening to the pilot chamber, and a first fluid passage opening to the main valve bore and to the pilot valve bore, a pilot valve mounted by the regulator body to extend in the pilot bore and operable between a closed position and an open position for controlling fluid flow from the first passage to the pilot chamber, flexible diaphragm means mounted by the housing for, upon a decrease of pressure in the pilot chamber, flex to operate the pilot valve member to an open position to permit fluid flow from the first passage to the pilot chamber and upon sufficient increase of pressure in the pilot chamber, flex whereby the pilot valve returns to its closed position, a main valve mounted by the regulator body to extend in the main valve bore and operable between a closed position and an open position for controlling fluid flow from the main valve bore to the control chamber, a piston movably mounted in the control chamber for dividing the control chamber into a first chamber portion and a second chamber portion and operating the main valve between a closed position and an opened position, the first chamber portion opening to the outlet, and at least one of the housing, the combination of the housing and piston and the combination of the housing, main valve and the piston having a second passage for fluidly connecting the pilot chamber to the control chamber second portion for applying fluid under pressure from the pilot chamber to the control chamber second portion to move the piston and therethrough operate the main valve to its open position when the pressure at the outlet falls below a preselected level, the second fluid passage including a piston bore extending through the piston and opening to the main valve bore remote from the openings of the inlet and the first passage to the main valve bore, the main valve in its open position permitting fluid flow from the inlet and through the main valve bore to the first chamber portion.