JPH0514057Y2 - - Google Patents

Description

[Detailed Description of the Invention] "Technical Field" The present invention relates to a speed control valve equipped with a needle valve and a check valve.

"Prior art and its problems" A speed control valve enables a controlled flow through a needle valve and a free flow in the opposite direction to this controlled flow, whereas a check valve enables a controlled flow in the direction of the controlled flow. is closed and opens when the free flow pressure exceeds a certain value. When looking at the specific structure of conventional speed control valves, there are problems such as a large number of parts and poor assembly, and as this type of functional component is prone to price competition, it is not always satisfactory in terms of cost. Ta. Furthermore, in conventional products, the check valve restricts the flow path for both controlled flow and free flow, making it difficult to secure a sufficient flow rate.

``Purpose of the invention'' This invention has a small number of parts, a simple structure,
The purpose of the present invention is to obtain a speed control valve that is easy to assemble and is therefore inexpensive. Another object of the present invention is to obtain a speed control valve in which the amount of restriction of the flow path by the check valve is small.

``Summary of the invention'' This invention provides a valve seat with a smaller diameter than the flow path in the linear main flow path of the control block, and a needle valve passage and a detour passage that communicate with the main flow path through the valve seat. A needle valve is provided in the needle valve passage, and a check valve seated on a valve seat is provided on the detour passage side in the main flow passage, and both passages communicate with each other. The stop valve has a cylindrical and elastic bellows part; a valve body that is formed by closing one end of the bellows part and sits on a valve seat; and a valve element with a smaller diameter than the main flow path provided at the other end of the bellows part. a collar made of a hard body; a plurality of radial ribs extending in the radial direction from the collar and fitting and fixed to the inner surface of the main flow path to secure a flow path between the collar and the main flow path; It is characterized by being composed of.

According to this configuration, the structure of the check valve is particularly simple; the bellows portion is compressed, the valve body is brought into contact with the valve seat, and the bellows portion is fixed in the flow path.
A check valve can be configured. The seating force (valve closing force) of the valve body against the valve seat is obtained by the bellows portion. In addition, a collar is provided at the end of the bellows portion opposite to the valve body, and this collar is
It is made of a hard body with a smaller diameter than the main flow path, and multiple ribs provided radially from this collar are fitted and fixed to the inner surface of the main flow path, increasing the positional accuracy of the valve element relative to the valve seat. Moreover, by securing a flow path between the main flow path and the main flow path, a sufficient flow area can be secured for both controlled flow and free flow.

``Embodiments of the invention'' The invention will be described below with reference to illustrated embodiments.
1 and 2 show an embodiment of the present invention. The speed control valve 10 includes a direction control valve 11 that controls pressure fluid from the pump P;
It is inserted between the cylinder device 12 and the pressure chamber 13, and the free flow V from the direction control valve 11 in the direction of the pressure chamber 13 is via the check valve 20.
Regarding the controlled flow C of the fluid that flows without restricting the flow path and is discharged from the pressure chamber 13, the flow path is restricted by the needle valve 40 without passing through the check valve 20.

The check valve 20 is provided in the main flow path 22 of the control valve block 21 at a partition wall 23 having a valve port 24 having a smaller diameter than the flow path. The valve port 24 is
An annular valve seat 24 is formed on the inner periphery of the end surface on the V side of free flow of fluid.
It is set as a. Reference numerals 25 and 26 are tapered threads for connecting pipes formed at both ends of the main flow path 22.

The check valve 20 includes a cylindrical bellows portion 27 that is extendable and retractable relative to the valve seat 24a, and a valve body 28 that closes the tip of the bellows portion 27 and moves toward and away from the valve seat 24a. The bellows portion 27 and the valve body 28 are integrally formed of an elastic body. Bellows part 27
The other end is open, and on the outer periphery of this other end,
A collar 29 is fitted concentrically. This collar 29 has a plurality of ribs 30 on the outer periphery, and the ribs 30 are fitted into the main flow path 22.
It is prevented from coming off by a stop ring 31 and is fixed to the inner wall of the main flow path 22. rib 30
This is effective for securing a flow path between the collar 29 and the main flow path 22, and also allows the center of the valve body 28 to correctly match the center of the valve seat 24a.

When assembling this check valve 20, the valve body with the collar 29 fixed to the bellows part 27 is attached to the main flow path 20.
2 and use the stop ring 31 to prevent it from coming off. The elasticity of the bellows portion 27 causes the valve body 28 to sit on the valve seat 24a, closing the flow path.

At the top of the control valve block 21, there is a main flow path 2.
A needle valve passage 41 communicating with the main flow passage 22 is formed in a diagonal relationship with respect to the main flow passage 22.
This needle valve passage 41 is connected to the control valve block 21.
It penetrates into the main flow path 22 from the outer surface of the main flow path 22, and forms an angle θ with respect to the axis of the main flow path 22. This θ is determined so that the vertical and horizontal dimensions s and l of the control valve block 21 can be made small. By decreasing θ, s can be decreased, and by increasing θ, l can be decreased.

The needle valve passage 41 opens into the main flow passage 22 on the left side of the partition wall 23 in FIG.

A needle valve 40 is inserted into the needle valve passage 41 . This needle valve 40 has an operating portion 43, a lock nut 44, a male thread portion 45, a seal portion 46, and a needle portion 47 in this order from the top. The male threaded portion 45 is connected to the needle valve passage 4.
It is screwed into the female threaded portion 48 of No. 1. Locknut 44
The needle valve 40 is screwed into this male threaded portion 45.
Regulates the rotation of. Furthermore, an O-ring that comes into elastic contact with the inner wall of the needle valve passage 41 is fitted into the seal portion 46 . The needle portion 47 changes the flow path area between the needle valve passage 41 and the constricted portion 41a by changing its axial position.

In the speed control valve 10 configured as described above, the free flow V flows without being substantially throttled when the check valve 20 is opened, and the flow path area of the controlled flow C depends on the axial position of the needle valve 40. can be controlled. That is, since the free flow V causes the valve body 28 of the check valve 20 to separate from the valve seat 24a against the force of the bellows portion 27, the flow path is not substantially restricted. On the other hand, when the controlled flow C occurs, the force of the bellows portion 27 and the force of the controlled flow C entering the bellows portion 27 cause the valve body 28 to
is seated on the valve seat 24a, so for the controlled flow C, the check valve 20 acts as a flow path blocking means.

The needle valve 40 controls the flow rate of this control flow C. That is, Locknut 44
When loosening and rotating the operating section 43, the male threaded section 4
5 and the female threaded portion 48, the needle portion 4
7 moves in the axial direction. Therefore, the needle part 47
If the operating part 43 is turned in a direction to bring the valve closer to the main flow path 22, the flow area from the constriction part 41a of the needle valve passage 41 to the detour flow path 42 becomes narrower, and the return of the piston 14 of the cylinder device 12 becomes slower. ,
Conversely, if the operating section 43 is turned in a direction that moves the needle section 47 away from the main flow path 22, the piston 14 will return more quickly.

As is clear from the above description, in the speed control valve 10 of the present invention, the check valve 20 is
It is disposed in the main flow path 22, and both the controlled flow and free flow pass through its outer periphery. The flow around this check valve 20 is ensured by ribs 30 which are integral with the collar 29. With conventional check valve structures, it has been difficult to secure this flow rate. Further, the valve body 28 provided at one end of the bellows portion 27 is
The rib 30 and collar 29 allow the valve to be properly centered and seated on the valve seat 24a.
The backflow prevention performance as a check valve can also be improved.

``Effect of the invention'' As described above, the speed control valve of the invention has a valve seat with a diameter smaller than that of the linear main flow path of the control block, and connects the main flow path with the valve seat in between. A needle valve passage and a detour passage are provided that communicate with each other, and both passages are made to communicate with each other, and a needle valve is provided in the needle valve passage, and a check valve that is seated on a valve seat is provided on the detour passage side in the main flow path. In this configuration, the check valve includes a bellows portion, a valve body formed by closing one end of the bellows portion, a collar provided at the other end of the bellows portion, and a plurality of ribs extending radially from the collar. Because it is constructed from
Sufficient flow area can be secured for both controlled flow and free flow. Further, the structure of the check valve is simple, and the check valve can be constructed simply by compressing the bellows portion, bringing the valve body into contact with the valve seat, and fixing the bellows portion within the flow path.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an embodiment of the speed control valve of the present invention, and FIG. 2 is a perspective view showing the shape of the valve body of the check valve in the speed control valve of FIG. 1 in a free state. 20... Check valve, 21... Control valve block, 2
2... Main flow path, 23... Partition wall, 24... Valve port, 24a... Valve seat, 27... Bellows portion, 28
... Valve body, 29 ... Color, 30 ... Rib, 40
...Needle valve.

Claims (1)

[Scope of Claim for Utility Model Registration] A valve seat with a smaller diameter than the flow path is provided in the linear main flow path of the control block, and a needle valve path and a detour path are connected to the main flow path with the valve seat in between. In addition to providing
Both passages are communicated with each other, a needle valve is provided in the needle valve passage, a check valve is provided on the detour passage side in the main flow passage and is seated on the valve seat, and the check valve is cylindrical and telescopic. a valve body formed by closing one end of the bellows portion and seated on the valve seat; a collar made of a hard body having a smaller diameter than the main flow path provided at the other end of the bellows portion; and; a plurality of radial ribs that extend radially from the collar and are fitted and fixed to the inner surface of the main flow path to secure a flow path between the collar and the main flow path. speed control valve.