DIAPHRAGM VALVE

• Main Author: BANDOU HIROSHI
• Format: Patent
• Language: English
• Published: 18.03.1991
• Subjects: ACTUATING-FLOATS; BLASTING; COCKS; DEVICES FOR VENTING OR AERATING; ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS; HEATING; LIGHTING; MECHANICAL ENGINEERING; TAPS; THERMAL INSULATION IN GENERAL; VALVES; WEAPONS

PURPOSE:To reduce the stress of a diaphragm and extend the life by providing multiple fixed receiving faces closely stuck with a back face not faced to the flow passage of the diaphragm when a valve is opened, and providing multiple movable receiving faces closely stuck with the back face of the diaphragm when the valve is closed radially alternately with fixed receiving faces. CONSTITUTION:When a valve rod 14 is moved upward and a valve is opened, movable receiving faces 29 are located above fixed receiving faces 24, and the upper face of a diaphragm 10 deformed in a turned-over dish shape is closely stuck to fixed receiving faces 24 at multiple fan-shaped portions at a uniform angular interval. No stress by the fluid pressure is applied to the diaphragm 10. The above stress occurs at noncontact portions, but the width of adjacent fixed receiving faces 24 is narrow, thus the stress is small, and the value of the total stress applied to the diaphragm deformed in a turned-over dish shape is small. When the valve is closed, the upper face of the diaphragm 10 with a flat shape is closely stuck to movable receiving faces 29, no stress is applied to the close contact portions like when the valve is opened, and the stress on the noncontact portions is suppressed small. The maximum value of the stress is small when the valve is opened and when it is closed.