JPH02140077U - - Google Patents

Description

[Brief explanation of the drawing]

Figures 1 and 2 show an embodiment of the present invention, Figure 1 is a longitudinal sectional view showing the controlled flow state of the pressure compensated flow rate regulating valve, and Figure 2 is the free flow of the pressure compensated flow rate regulating valve. Fig. 3 is a vertical cross-sectional view of a pressure-compensated flow rate regulating valve showing another embodiment of the present invention, and Fig. 4 is a longitudinal cross-sectional view of a pressure-compensated flow regulating valve showing a conventional example. It is a diagram. 1,41... Valve body, 2,42... Valve hole, 4,
43...Primary flow path, 5, 44...Secondary flow path, 6,
45...Flow rate adjustment piston, 9, 46...Inner diameter hole, 10,47...First communication hole, 11,48...Second communication hole, 12,49...First action chamber, 13,5
0... Second action chamber, 15, 51... Flow rate adjustment member, 16, 52... Pressure compensating spool, 16A, 5
2A...Land part.

Claims (1)

[Scope of utility model registration request] A flow rate adjusting piston is provided with a valve hole that opens a primary passage and a secondary passage through which pressurized liquid flows into the valve body with an interval in the axial direction, and is fitted into the valve hole so as to be slidable in the axial direction. A first communication hole communicating with the primary flow path of the valve body and a second communication hole communicating with the secondary flow path are opened in the flow rate adjustment piston with an interval in the axial direction. A first working chamber that communicates with the primary flow path and a second working chamber that communicates with the secondary flow path are formed opposite to each other at both axial ends of the flow rate adjusting piston through the valve hole of the valve body. The degree of communication opening of the first communication hole to the primary flow path or the degree of communication opening of the second communication hole to the secondary flow path can be freely changed, and the pressure liquid flowing from the primary flow path to the secondary flow path is controlled to be constricted. A flow rate adjustment member that allows the axial position of the flow rate adjustment piston to be changed freely is provided,
A pressure compensating spool is provided that is slidably fitted in the inner diameter hole of the flow rate adjusting piston in the axial direction, and the liquid pressure before and after the first communication hole or the second communication hole acts oppositely in the axial direction to control the pressure liquid. The pressure compensating spool slides in the axial direction to a position where the spring force and the acting force based on the liquid pressure difference before and after the first communicating hole or the second communicating hole are in equilibrium for constriction control of the pressure liquid. The second communication hole or the first communication hole is set so that the communication opening with the secondary flow path or the primary flow path is fully opened regardless of the axial sliding of the flow rate adjustment piston so that the pressure difference between the front and rear of the communication hole is approximately constant. It has a land part that constricts and controls the flowing pressure liquid, and the flow rate adjustment piston slides in the axial direction by the action force acting on the second action chamber when the liquid flows from the secondary flow path to the primary flow path to adjust the flow rate. A pressure-compensated flow rate regulating valve that is detachable from a flow rate regulating member so as to fully open the communication opening of a first communicating hole or a second communicating hole set by the regulating member.