JPH0281976U - - Google Patents

Description

[Brief explanation of drawings]

Fig. 1 is a vertical sectional view of a pressure control valve showing an embodiment of the present invention, Fig. 2 is an enlarged sectional view of a recess formed in the land of the spool valve body, and Fig. 3 is a pressure control valve of the present invention. A circuit diagram of a fluid actuator device using a valve, FIG. 4 is a longitudinal sectional view of a conventional pressure control valve. DESCRIPTION OF SYMBOLS 1... Valve body, 3... Supply channel, 4... Discharge channel, 5... Load channel, 6... Valve hole, 8... Spool valve body, 8A... Land portion, 8B, 8E... ...shaft part, 9 ... recessed part, 9A ... outer peripheral surface, 12 ... first
Pressure chamber, 13...second pressure chamber.

Claims (1)

[Scope of utility model registration request] A valve hole into which a spool valve body is slidably inserted is provided in the valve body, and the valve hole has a load flow path communicating with the fluid actuator side, and a space between the load flow path and the load flow path in the axial direction. A supply flow path for supplying pressure fluid and a discharge flow path that communicates with the low pressure side with an axial spacing on the other side of the load flow path are opened, and the spool valve body can be freely slid into the valve hole. By fitting the valve into the valve hole, a first pressure chamber is defined at one end of the spool valve body on the supply flow path opening side from the load flow path opening portion of the valve hole, into which a pressure fluid whose set pressure can be freely adjusted is introduced. A second pressure chamber communicating with the load flow path is defined at the other end of the spool valve body on the side of the discharge flow path opening point from the load flow path opening point of the hole, and the spool valve body has a land portion that slides with the valve hole; A shaft portion with a smaller diameter than the land portion is provided in series on both sides of the land portion, and the acting force based on the pressure fluid of the first pressure chamber and the second pressure chamber acts in balance, thereby opening the load flow path to the valve hole. The first position is closed by the land part to cut off the flow paths, and the land part is in the valve hole because the acting force based on the pressure fluid in the second pressure chamber is greater than the acting force based on the pressure fluid in the first pressure chamber. A second position that slides in the axial direction between the load flow path opening point and the supply flow path opening point so that the load flow path and the discharge flow path communicate with each other and interrupting the supply flow path, and the pressure in the second pressure chamber. Since the acting force based on the fluid is smaller than the acting force based on the pressure fluid in the first pressure chamber, the land portion slides in the axial direction between the opening location of the load flow path and the opening location of the discharge flow path of the valve hole, thereby reducing the load flow. The land portion of the spool valve body has an annular recessed portion by recessing the end surface communicating with the shaft portion, and the land portion of the spool valve body has an annular recessed portion. In order to reduce the fluid force that opposes the sliding when the spool valve body slides in the axial direction from the first position to the second and third positions, the outer circumferential surface is recessed from the end surface and the diameter is gradually reduced toward the side. A pressure control valve formed into a shape.