Fluid control device

A technology for fluid control devices and fluid control valves, which is applied in the direction of fluid pressure actuators, lifting devices, servo motors, etc., and can solve the problem of unstable operability of operators
CN113286951AActive Publication Date: 2021-08-20SHIMADZU SEISAKUSHO CO LTD
6 Cites 0 Cited by

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
SHIMADZU SEISAKUSHO CO LTD
Publication Date
2021-08-20

Smart Images

  • Figure 1
    Figure 1
  • Figure 2
    Figure 2
  • Figure 3
    Figure 3
Patent Text Reader

Abstract

During opening and closing operations of a fluid control valve (2), the port pressure in the fluid control valve (2) is guided to a main relief valve (6) via a first passage (101) and the maximum pressure thereof is controlled by the main relief valve (6). In addition, the port pressure in the fluid control valve (2) is simultaneously guided to pressure compensation valves (21), (31), (41) of fluid control valves (2), (3), (4). Thus, even in the case when functions with different load pressures are simultaneously operated in the fluid control valves (2), (3), (4), it is possible always to guarantee constant operability regardless of the pressure load. In addition, during opening and closing operations of the fluid control valve (3) that drives a tilt cylinder (30) for a function to tilt a fork, the port pressure of the fluid control valve (3) is guided to a secondary relief valve (7) via a second passage (102), is guided to the main relief valve (6) via the first passage (101), and is guided to the pressure compensation valves (21), (31), (41) of the fluid control valves (2), (3), (4).
Need to check novelty before this filing date? Find Prior Art

Description

technical field

[0001] The present invention relates to a fluid control device of a closed center circuit type having a plurality of fluid control valves. Background technique

[0002] In such a fluid control device having a structure in which a plurality of fluid control valves (control valves) are arranged in a row, a relief valve is used in order to prevent an excessive increase in the hydraulic pressure of the working fluid. For example, in a fluid control device used in a forklift, a structure is adopted in which a pressure relief valve corresponding to the maximum pressure is used for an area where the hydraulic pressure of the working fluid such as an elevating function is required to be maximum, and a hydraulic pressure of the working fluid is lower than that. Areas, set pressure relief valves in each area. Therefore, the pressure relief valve is required for each function, and the device is complicated and enlarged, and the cost of the device is increased. [0003...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More