JPH01124478U - - Google Patents

Description

[Brief explanation of drawings]

FIG. 1 is a sectional view of an embodiment of the present invention. 6: Secondary chamber, 10: Valve body, 11: Lower edge (of valve body 10), 18: Valve rod, 30: Vibration isolating membrane, 32:
Pressure adjustment chamber, 38: communication hole.

Claims (1)

[Scope of utility model registration request] A primary chamber communicating with the inlet and a secondary chamber communicating with the outlet are provided in the body and communicated with each other through a valve port, and the valve port is connected to the secondary chamber by moving the valve port toward and away from the valve seat. A bowl-shaped valve body that opens and closes is biased in the valve closing direction by a spring force, and a valve rod protruding from the valve body is applied to the body in the valve opening direction with a force approximately proportional to the control current flowing to the coil. A proportional solenoid is provided to press the valve, and the opening degree of the valve port is adjusted by balancing the pressing force of the proportional solenoid with the spring force, and the pressure of the primary chamber is applied to a diaphragm connected to the valve rod. In the proportional control valve, the pressure in the secondary chamber is maintained at a set constant value by adjusting the opening degree of the valve port by movement of the valve body in accordance with fluctuations in the pressure. A vibration isolating membrane made of an elastic material such as rubber is stretched around the opening edge of the valve body facing into the secondary chamber, and a pressure regulating chamber is airtightly isolated from the secondary chamber by the vibration isolating membrane within the valve body. A proportional control valve characterized in that a communication hole is formed in the valve rod to open the pressure adjustment chamber to the atmosphere.