JPH04228902A - Multiple control valve - Google Patents

Abstract

PURPOSE:To build a load check valve into a valve body as integral part thereof, and reduce the number of parts items. CONSTITUTION:A pair of valve ports 69 and 70 are formed in a valve body H3, and load check valves 49 and 50 are built into the the ports 69 and 70. In addition, the springs 71 and 72 of the load check valves 49 and 50 are pressed with another valve body H2.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sectional type multiple control valve.

0002

2. Description of the Related Art FIG. 5 is a circuit diagram using a conventional multiple control valve, in which valve blocks V1 and V2 are constructed for each pump P1 and P2, respectively. One valve block V1 is provided with an inlet section 1 on its most upstream side and an outlet section 2 on its most downstream side, and between these sections 1 and 2,
Control sections 3-5 are provided. Moreover, each of these control sections 4 and 5 has a load check valve t.
1 and t2 are provided. Similarly, a control section 8 is provided between the inlet section 6 and the outlet section 7 in the other valve block V2.
~10 are provided. Moreover, these control sections 9
, 10 are also provided with load check valves t3 and t4. This control section has a directional valve as its main element, and is shown in Figure 5.
In the control section in , the spool parts 11-13, 14-16 of the directional valve are represented.

0003

[Problems to be Solved by the Invention] In the conventional multiple control valve as described above, each control section requires a load check valve, so the assembly work must be done for each section. There was a problem in that the assembly work became troublesome. An object of the present invention is to provide a multiple control valve in which a plurality of load check valves are integrated into a valve body and the number of these parts is reduced.

0004

[Means for Solving the Problems] In the present invention, a plurality of spools are installed in parallel in a valve body that forms a contact surface that contacts other sections, and parallel feeders of the same number as the number of spools are formed. On the other hand, each of these parallel feeders is characterized in that it is provided with a load check valve that allows flow only to the actuator flow path, and that the valve holes of these load check valves are opened toward the contact surface side.

[0005]

[Operation] Since the present invention is constructed as described above, by switching the spool incorporated in the valve body, pressure oil from the parallel feeder corresponding to the spool can be supplied to the actuator flow path. Since a load check valve is provided in this flow path, backflow from the actuator can be prevented and the load can be maintained.

[0006]

[Effects of the Invention] According to the multiple control valve of the present invention, a plurality of load check valves are incorporated into the valve body, so the assembly work is easier compared to incorporating load check valves separately for each control section. It gets easier. Moreover, since the valve hole of this load check valve is opened on the contact surface side of the valve body, the opening can be covered by the valve body of another control section. In other words, no special parts are required to hold the load check valve in the valve hole, and the number of parts can be reduced accordingly.

[0007]

[Embodiment] Fig. 1 is a circuit diagram using the multiple control valve of the present invention, in which two pumps P1 and P2 are each connected to one valve block V. An inlet section 17 is provided on the side, and an outlet section 18 is provided on the downstream side, and valve bodies H1 to H3 of control sections 19 to 21 are connected between these sections 17 and 18.

Of this control section, the valve body H3 in the control section 21 in particular is constructed as shown in FIGS. 2 to 4. In other words, contact surfaces 2 are provided on both sides of the valve body H3 constituting the control section 21.
2 and 23 are formed. A seal groove 24 having a circular planar shape is formed on one contact surface 22.
At the same time, the seal member 25 is attached to the seal groove 24.
A convex portion 26 is formed at approximately the center position inwardly of the contact surface 22 so as to be at the same level as the contact surface 22.

This convex portion 26 has a parallel feeder 27,
28 and valve holes 69 and 70 are opened. This valve hole 6
As shown in FIG. 4, load check valves 49 and 50 are installed inside each of valves 9 and 70, respectively. The load check valves 49, 50 normally close the seat portions 47a, 48a by the action of springs 71, 72, but the springs 71, 72 are pressed by the contact surface 23 of the other valve body H2. There is. Therefore, no special parts are required to hold down the springs 71, 72.

[0010]The convex portion 26 is connected to the mating body H2.
By making metal contact with the contact surface 23 of the parallel feeders 27, 28 and load check valves 49, 50
Seal any leaks from the back of the. Further, oil leaking from this seal portion passes through the recess 68 and into the tank passages 51 and 5.
It flows to 2.

The valve body H3 constructed as described above is provided with two parallel spools S1 and S2 which are perpendicular to the parallel feeders 27 and 28. A pair of annular grooves 29 and 30, 31 and 32 are formed in both the spools, and land portions 33 to 35 and 36 to 38 are formed between the two annular grooves and on the outside of both the annular grooves. These spools S1 and S2 are neutral springs 39 and 40
Normally, the neutral position shown in the figure is maintained.

When the spool is held in the neutral position as described above, the introduction grooves 41 and 4 formed in the valve body H3
2 is closed by the land portions 34 and 37, and the actuator flow paths 43, 44, 45, and 46 are blocked from the introduction grooves 41 and 42, respectively. In addition, this introduction groove 4
1 and 42 communicate with the parallel feeders 27 and 28 via branch passages 47 and 48, respectively.

Further, in the valve body H3, a pair of tank passages 51 are provided outside the parallel feeders 27 and 28.
, 52 are formed, and these tank passages 51, 52 are connected to a tank T provided outside the outlet section 18. The tank passages 51 and 52 communicate with return passages 53 and 54, 55 and 56, respectively, and these return passages 53 to 56 communicate with both spools S1 and S2.
actuator channels 43 to 46 depending on the movement position of
Communication may be interrupted or communication may be interrupted. In other words,
When the spools S1 and S2 are in the neutral position shown,
The return channels 53 to 56 are connected to the lands 33 and 35 of the spool.
, 36 and 38, the actuator channels 43-46
Communication with is cut off.

If the spools S1 and S2 move, for example, to the left in the drawing, the actuator flow path 43 and the return flow path 53 communicate with each other via the annular grooves 29 and 31 of these spools, and the actuator flow Path 45 and return flow path 55 communicate with each other. When the spool moves to the right in the opposite direction, the actuator flow path 44 and the return flow path 54 communicate with each other via the annular grooves 30 and 32, and the actuator flow path 46 and the return flow path 56 communicate with each other via the annular grooves 30 and 32.
communicate with.

Reference numerals 57 to 60 in the figure are relief valves having an anti-void function, which are used to maintain the pressure within the actuator flow path within a set pressure.

As shown in FIGS. 2 and 3, the multiple control valve constructed as described above has a contact surface 22 of one valve body H3 of the plurality of valve bodies and a contact surface 22 of the other valve body H2. The valve body is brought into contact with and connected to the surface 23, and is firmly fastened by tie rods inserted into tie rod holes 61 to 64 formed in the valve body. In other words, in this embodiment, two spools S1 and S2 are installed in one valve body H3, and parallel feeders 27 and 28 and tank passages 51 and 52 are formed in this valve body H3, thereby eliminating the conventional separation. It is a combination of sections that were previously

Furthermore, parallel feeders 27, 28 and load check valves 49,
These parallel feeders 27, 28 and load check valves 49, 50 are arranged so that the distance between the spools and the lateral length of the sections are shortened.
Since the valve body H3 is arranged diagonally, the valve body H3 becomes compact, and only one sealing member 25 is required, and this sealing member 25 does not have to be so large compared to the conventional one.

Note that the actuator channels 43 and 44,
5 and 46 are connected to cylinders a1 and a2, and these cylinders are driven by switching the spools S1 and S2 to either the left or right side. For example, when one spool S1 is moved to the left in the drawing, the introduction groove 4 passes through the annular groove 30 of this spool.
1 and the actuator flow path 44 communicate with each other, while the actuator flow path 43 and the return flow path 53 communicate with each other via the annular groove 29 . Therefore, the pressure fluid from the pump P1 supplied to the parallel feeder 27 passes through the branch passage 47 → load check valve 49 → introduction groove 41 → annular groove 30 → actuator flow passage 44, and enters the rod side chamber 65 of the cylinder a1. Inflow. On the other hand, the hydraulic oil in the bottom side chamber 66 of the cylinder a1 changes from the actuator flow path 43 to
Since the cylinder a1 returns to the tank T via the annular groove 29→return passage 53→tank passage 51, the cylinder a1 moves its piston 67 to the left in the drawing and contracts.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram.

FIG. 2 is a plan view.

FIG. 3 is a cross-sectional view.

FIG. 4 is a sectional view taken along line XX and YY in FIG. 2;

FIG. 5 is a conventional circuit diagram.

[Explanation of symbols]

22, 23 Contact surfaces 27, 28 Parallel feeders S1, S2 Spools 43 to 46 Actuator channels 49, 50
Load check valve 69, 70 valve hole

Claims (1)

[Claims] [Claim 1] A plurality of spools are installed in parallel in a valve body that forms a contact surface that comes into contact with other sections, and the same number of parallel feeders as the number of spools are formed, and each of these parallel feeders has a plurality of parallel feeders. A multiple control valve comprising a control section including load check valves that allow flow only to the actuator flow path, and in which valve holes of these load check valves are opened on the contact surface side.