Patent ID: 8297306
Filing Date: 2012-10-30
Classification: F16K,G05D,Y10T

Abstract:
1. A fluid regulator for controlling the flow rate of a fluid passing therethrough to be constant by adjusting a valve opening, comprising: a first diaphragm chamber in which a working force obtained from a gas is received by a first diaphragm to generate a force for adjusting the valve opening; a second diaphragm chamber in which a bottom first surface of a second diaphragm is subject to a fluid pressure from an upstream side of the regulator and having passed the valve opening, and a top second surface of the second diaphragm, opposite to the first surface, receives pressure fluctuations of the fluid introduced from a downstream side of an orifice located at the downstream side of the regulator to generate a force for adjusting the valve opening; a shaft that receives the adjusting forces generated in the first diaphragm chamber and the second diaphragm chamber and that slides in a shaft direction; a valve that operates together with the shaft to adjust the valve opening, the valve having a lower valve stem; a lower spring provided against the lower valve stem, the valve constantly receiving an upward urging force from the lower spring and, during a low flow state, the valve constantly receiving an upward urging force resulting from fluid pressure at the bottom, first side of the second diaphragm; a partition wall that isolates the first diaphragm chamber from the second diaphragm chamber so as to prevent the pressure of the fluid in the second diaphragm chamber from acting directly on the first diaphragm; and sealing means for blocking the circulation of the fluid between the first diaphragm chamber and the second diaphragm chamber.