Patent ID: 8240327

Claim:
A fluid regulating device, comprising: a valve having a first inlet, a first outlet, and a first valve port disposed between the first inlet and the first outlet; an actuator coupled to the valve, the actuator comprising: a housing coupled to the valve, a first valve disc disposed within the valve and adapted for displacement between a closed position engaging the first valve port and an open position disposed away from the first valve port, and a first diaphragm disposed within the housing and dividing the housing into a first cavity and a second cavity, with the first diaphragm being operatively coupled to the first valve disc, and with the first cavity of the housing being in fluid communication with the first outlet of the valve; and a pressure loading device coupled to the valve and to the actuator, the pressure loading device comprising: a body having a second inlet, a second outlet, and a second valve port disposed between the second inlet and the second outlet, wherein the second inlet is in fluid communication with the first inlet, and the second outlet is in fluid communication with the second cavity of the housing; a bonnet coupled to the body, a second valve disc disposed within the body and adapted for displacement between a closed position engaging the second valve port and an open position disposed away from the second valve port, a second diaphragm disposed within the bonnet and dividing the bonnet into a first cavity and a second cavity, with the second diaphragm being operatively coupled to the second valve disc, and with the first cavity of the bonnet being in fluid communication with the second outlet when the second valve disc is in the closed position and in the open position, and a control spring disposed within the second cavity of the bonnet and engaging the second diaphragm, wherein the second diaphragm and the control spring are configured to cause the second valve disc to move toward its open position when the pressure at the second outlet decreases and to cause the second valve disc to move toward its closed position when the pressure at the second outlet increases to maintain a pressure within the second cavity of the actuator approximately equal to a load pressure, and wherein the actuator is configured to cause the first valve disc to move toward its open position when the pressure at the first outlet decreases and to cause the first valve disc to move toward its closed position when the pressure at the first outlet increases to maintain the pressure at the first outlet approximately equal to a setpoint pressure.