Pressure-type flow rate control device
First Claim
1. A pressure-type flow rate control device comprising:
- a body provided with a fluid passage communicating a fluid inlet and a fluid outlet,a control valve for pressure control fixed to the body to open and close the fluid passage,an orifice arranged in the course of the fluid passage on the downstream side of the control valve for pressure control, anda pressure sensor fixed to the body to detect the internal pressure of the fluid passage between the control valve for pressure control and the orifice, wherein,the fluid passage comprises a first passage portion communicating the control valve for pressure control and a pressure detection chamber on a pressure detection surface of the pressure sensor, and a second passage portion spaced away from the first passage portion and communicating the pressure detection chamber and the orifice, whereby the fluid passage is configured to go through the pressure detection chamber, whereinthe pressure sensor is arranged below the control valve, and the first passage portion vertically extends from a central portion of a valve element of the control valve to an end portion of the pressure detection chamber, and whereinthe second passage portion comprises a vertical part connected to an opposite end portion of the pressure detection chamber and a horizontal part extending from the vertical part, the orifice being positioned near an end portion of the horizontal part.
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Accused Products
Abstract
A pressure-type flow rate controller includes a body provided with a fluid passage which communicates a fluid inlet and a fluid outlet, a control valve for pressure control fixed to the body to open and close the fluid passage, an orifice arranged in the course of the fluid passage on the downstream side of the control valve, and a pressure sensor fixed to the body to detect the internal pressure of the fluid passage between the control valve and the orifice, wherein the fluid passage comprises a first passage portion communicating the control valve and a pressure detection chamber provided on a pressure detection surface of the pressure sensor, and a second passage portion spaced away from the first passage portion and communicating the pressure detection chamber and the orifice.
28 Citations
10 Claims
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1. A pressure-type flow rate control device comprising:
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a body provided with a fluid passage communicating a fluid inlet and a fluid outlet, a control valve for pressure control fixed to the body to open and close the fluid passage, an orifice arranged in the course of the fluid passage on the downstream side of the control valve for pressure control, and a pressure sensor fixed to the body to detect the internal pressure of the fluid passage between the control valve for pressure control and the orifice, wherein, the fluid passage comprises a first passage portion communicating the control valve for pressure control and a pressure detection chamber on a pressure detection surface of the pressure sensor, and a second passage portion spaced away from the first passage portion and communicating the pressure detection chamber and the orifice, whereby the fluid passage is configured to go through the pressure detection chamber, wherein the pressure sensor is arranged below the control valve, and the first passage portion vertically extends from a central portion of a valve element of the control valve to an end portion of the pressure detection chamber, and wherein the second passage portion comprises a vertical part connected to an opposite end portion of the pressure detection chamber and a horizontal part extending from the vertical part, the orifice being positioned near an end portion of the horizontal part. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification