Flow control valve

US6199582A · kind A · utility

Assignee

• ADVANCE DENKI KOGYO KABUSHIKI KAISHA · JP

Inventors

• Hironori Matsuzawa · Ebeye, US
• Tsuyoshi Hida · Nagoya, JP
• Kimihito Sasao · Ebeye, US

Key dates

• Filing date: Jul 8, 1999
• Grant date: Mar 13, 2001
• Expiry date: Jul 8, 2019

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T137/7836
• WIPO field: Control
• WIPO sector: Instruments

Abstract

The flow control valve (10) has a body (11) and a valve mechanism (40). The body defines a chamber (20). The chamber involves an inlet (12) for receiving fluid to control, a valve seat (16) for passing the fluid, and an outlet (15) for discharging the fluid. The valve mechanism consists of a valve plug (41) for opening and closing the valve seat, a first diaphragm (50) arranged in the vicinity of the inlet, and a second diaphragm (60) arranged in the vicinity of the outlet. Each of the diaphragms is in the chamber and has a periphery fixed to the body. The diaphragms divide the chamber into a first pressure chamber (21) outside the first diaphragm, a valve chamber (25) between the diaphragms, and a second pressure chamber (30) outside the second diaphragm. The valve chamber includes the inlet, valve seat, and outlet. The first and second pressure chambers have a first pressurizing unit (M1) and second pressurizing unit (M2), respectively, to always apply constant pressure to the valve chamber through the first and second diaphragms. The first diaphragm (50) is provided with an integrated first member (51) having the valve plug (41), and the second diaphragm (60) is provided with an…