Pressure regulating valve

Abstract

To realize a pressure regulating valve that allows adjustment of the valve opening degree without being affected by the pressure of the operating environment. [Solution] The internal pressure of the second chamber (52) housing the adjustment spring (17) that biases the stem (19) of the back pressure valve (1) to the seat (151) is kept constant by a constant pressure mechanism.

Claims

1. A valve seat and a valve body are provided, and a first chamber is formed when the valve body is separated from the valve seat, It has a second chamber which houses a biasing member that biases the valve body toward the valve seat and seats it, and which is airtight or liquidtightly separated from the first chamber, A pressure regulating valve in which the valve seat detaches from the valve body when the pressure of the fluid in the first chamber exceeds the biasing force of the biasing member, A pressure regulating valve further comprising a constant pressure mechanism for maintaining a constant internal pressure in the second chamber.

2. The biasing member is a spring, The second chamber is airtight and expandable in the axial direction, and includes an expansion tube that houses the spring inside. The pressure of the fluid in the first chamber is the force pressing against the expansion joint. The pressure regulating valve according to claim 1.

3. An adjustment screw is positioned to be movable forward and backward from the opposite side of the valve body and adjusts the biasing force of the biasing member according to its extended position. It further comprises an expandable tube that is airtight and expandable in the axial direction, housing the adjustment screw inside, and expanding and contracting in accordance with the movement of the adjustment screw, The aforementioned expansion joint includes the adjustment screw and constitutes a third chamber that is airtightly separated from the second chamber. The pressure regulating valve according to claim 1.

4. The pressure regulating valve according to claim 1, wherein the constant pressure mechanism maintains a constant internal pressure in the second chamber by creating a vacuum in the second chamber.

5. A back pressure valve, as described in any one of claims 1 to 4.

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