JPH10176760A - Flow regulating valve with check function - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a flow regulating valve with a check function to have both a check valve function and a flow rate regulating valve function to reduce the number of valves used in a line. SOLUTION: A flow regulating valve with a check function comprises a valve box 2 wherein an inflow passage 3 and an outflow passage 4 are intercoupled through a vertical passage 5 and a valve seat 6 is arranged at the periphery of the outlet of the vertical passage 5; a cover 7 to cover the valve box 2; a valve rod 8 vertically moved in the valve box 2 and the cover 7; a cylinder 9a fixed at the lower end of the valve rod 8; a slide rod 10a vertically movable through the cylinder 9a and having an end part at which a guide 11 is arranged; and a valve element 12 fixed at the lower end of the slide rod 10a and seating the valve seat.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flow control valve with a non-return function, and more particularly to a flow control valve with a non-return function having a valve stem mounted on a valve stem.

[0002]

2. Description of the Related Art Fluid pipes provided in various devices and facilities have gate valves having different functions for abnormal stoppage of a pump, prevention of stroke due to stoppage, and adjustment of flow rate. , A regulating valve and a check valve. Conventionally, as a regulating valve among various valves used for such an application, generally, a valve rod 8 is moved up and down by turning a handle 13 as shown in FIG. The fixed valve element 12a is moved up and down to adjust the gap between the valve element 12a and the valve seat 6 to adjust the flow rate.

As a check valve, when the fluid flows from left to right as shown in FIG. 8, the valve body 12b is lifted by the pressure of the fluid and flows as shown by the arrow, and flows from left to right. When the flow is to be performed, the flow is blocked by its own weight, the fluid flows into the space 28 in the valve body from the fluid circulation hole 29, and the valve body 12b is pressed against the valve seat 6.

[0004] However, in conventional piping of equipment and facilities, three types of valves having such different functions must be used, so that at least three expensive valves must be used. was there.

[0005]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a flow control valve having a check function having both a check valve function and a flow control valve function in order to reduce the number of valves used in a pipeline. It is an object.

[0006]

In order to achieve the above object, in a flow control valve with a non-return function according to the present invention, an inflow path and an outflow path are connected by a vertical passage, and an outlet of the vertical passage is connected to a vertical passage. A valve box provided with a valve seat around it, a lid to cover the valve box, a valve stem moving up and down in the valve box and the lid by turning a handle attached to the upper end, and fixed to the lower end of the valve stem A cylinder, a slide rod which is vertically movable in the cylinder and has a guide at an upper end thereof, and a valve body which is provided at a lower end of the slide rod and can be seated on the valve seat. That is.

In order to achieve the above object, in a flow control valve with a check function according to the present invention, an inflow path and an outflow path are connected by a vertical passage, and a valve seat is provided around an outlet of the vertical passage. , A lid that covers the valve box, a valve stem that moves up and down in the valve box and the lid by turning a handle attached to the upper end, and is fixed to the lower end of the valve stem and has no bottom. A cylinder, a slide bar that can move up and down in the cylinder, and a valve body that is provided at the lower end of the slide bar and that can be seated on the valve seat.

Further, in order to achieve the above object, in the flow control valve with a non-return function according to the present invention, at least one of the upper part and the lower part of the cylinder fixed to the lower end of the valve stem is provided with the fluid entering the cylinder. One fluid drain hole for each
That is, more than one pieces are provided. In the flow control valve with a non-return function of the present invention, means necessary for other valves such as a means for supporting the valve stem, a means for moving the valve stem up and down, and a structure of a valve box are conventionally known. It goes without saying that any material can be used as long as it can be used in the present invention.

[0009]

Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a sectional view showing a first embodiment of a flow control valve with a check function according to the present invention. The flow control valve with a check function according to the first embodiment of the present invention moves up and down in the valve box 2, the lid 7 that covers the valve box, and the inside of the valve box 2 as shown in FIG. 1. A valve rod 8, a cylinder 9a fixed to the lower end of the valve rod 8, a slide rod 10a capable of freely moving up and down in the cylinder 9a, and a valve body 12 provided at the lower end of the slide rod 10a. It is.

The valve box 2 of the flow control valve 1 with a check function according to the present invention.
The upper part has a portion for accommodating the valve body 12, the cylinder 9a, etc., and the lower part has an inflow path 3 and an outflow path 4,
The inflow channel 3 and the outflow channel 4 are partitioned by two inclined walls and one horizontal wall, and a vertical passage 5 is provided on the horizontal wall. A valve seat 6 is provided around the vertical passage 5 in the horizontal wall, and a valve body 12 described later is seated thereon.

A cover 7 for supporting a valve rod 8 and the like is screwed and attached to the upper part of the valve box 2. The lid 7 is provided with a female screw 15 that is screwed into a male screw 14 provided on the valve stem 8, and a packing 16 and a packing retainer 17 are provided in the upper part so that fluid does not flow outside. A cap nut 18 to be fixed is screwed. This cap nut 1
8, the packing 16, and the lid 7 have a valve stem 8 at the center thereof, and the lower part of the valve stem 8 reaches the valve box 2. A handle 13 is fixed at the upper end of the valve stem 8 with a nut 19, a male screw 14 is provided slightly below the center, and a female screw 15 provided on the lid 7 is screwed. Are fixed with bolts 20. This valve stem 8
When the handle 13 is turned, the valve moves up and down, and the valve body 12 described later moves up and down.

A cylinder 9a fixed to the lower end of the valve rod 8
Are male and female screws 21, 22 with upper and lower
And a slide bar 10a is contained therein. The slide rod 10a has a guide 11 fixed to the upper end with bolts 23, and a valve body at the lower end.
12 are fixed. The valve body 12 has a tapered lower portion, and a flange 24 integrally provided at the lower end of the slide rod 10a is fixed between the valve body fixing screw 25 and the valve body 12 by a valve body fixing screw. 25 male threads and female thread 26 on valve body 12
It is fixed so as to be sandwiched by. Since the slide bar 10a is provided with the guide 11 at the upper end, the slide bar 10a can freely move up and down in the cylinder 9a without swinging left and right. The lower part of the valve body 12 is tapered, so that even if the valve body 12 does not fall at the center of the valve seat 6, the valve body 12 is seated in close contact with the valve seat 6.

Next, the function of the flow control valve with a check function will be described with reference to FIGS. When the handle 13 is turned, the valve rod 8 and the cylinder 9a are lowered by turning the handle 13, and when the valve body 12 is pressed against the valve seat 6 with the cylinder 9a, the vertical passage 5 is formed as shown in FIG. Closed and fluid flow stops. In this state, when the handle 13 is turned and the valve rod 8 and the cylinder 9a are raised, the valve body 12 is lifted by the pressure of the fluid to open the vertical passage 5 as shown in FIG. The fluid flows in the direction of the path 4. If the pump stops abnormally in this state, the fluid does not enter from the inflow passage 3, so that the valve body 12 cannot be pushed up by the pressure of the fluid, and as shown in FIG. The passage 5 is closed, and backflow from the outflow channel 4 to the inflow channel 3 is prevented.

This flow control valve with a check function is provided by a cylinder
Although there is no hole for draining the fluid that has entered the inside of the cylinder 9a, as shown in FIG. 5, the upper and lower portions of the cylinder 9a are quickly moved up and down when the valve rod 8 moves up and down as shown in FIG. One or both fluid drain holes 27a and 27b
Or more can be provided. Fluid drain hole only on top
With the provision of 14a, when the fluid flows backward, the fluid enters the upper part of the cylinder 9a, and the slide rod 10a is pushed down by it, so that the valve element 12 can be more securely pressed against the valve seat 6. Also, slide rod 10 is set in cylinder 9a.
The pressure of the fluid can be reduced by inserting a spring so as to push a downward. Further, a weak spring may be provided in the cylinder 9a so as to push down the slide bar 10a in order to quickly lower the valve body 12.

Next, a second embodiment of the flow control valve with a check function according to the present invention will be described. FIG. 4 is a sectional view showing a second embodiment of the flow control valve with a check function according to the present invention.
The flow control valve with a check function of the second embodiment of the present invention,
As shown in FIG. 4, the cylinder 9a of the flow control valve with a check function according to the first embodiment is changed to a cylinder 9b without a bottom, and a slide rod 10b that moves up and down in the cylinder 9b.
Is the one without the guide 11.

The flow control valve with a check function has the same function as the flow control valve with a check function of the first embodiment.
Since it is not necessary to use the guide 11 and the bolt 23 for fixing the guide 11, the height of the valve box 2 can be reduced, and the shapes of the cylinder 9b and the slide rod 10b are simple, so that the manufacturing is easy. It is.

This flow control valve with a check function is provided by a cylinder
9b is not provided with a hole for draining the fluid contained therein, but in order to speed up the movement of the valve body 12 when the valve rod 8 moves up and down, FIG.
As shown in (1), one or more fluid vent holes 27c can be provided in the upper part of the cylinder 9b. When the fluid vent hole 27c is provided in the upper portion as described above, when the fluid flows backward, the fluid enters the upper portion of the cylinder 9b, and the valve body 12 is more reliably moved to the valve seat 6.
Can be pressed against. The fluid pressure can be adjusted by inserting a spring in the cylinder 9a so as to push the slide bar 10a downward. In addition, valve body 12
Slide rod in cylinder 9b to speed up descent
A weak spring could be inserted to push down 10b.

[0018]

The flow control valve with a check function according to the present invention has the following excellent effects by adopting the above structure. (1) Since one valve has the function of a check valve and the function of a flow control valve, the number of valves installed in a pipeline can be reduced. (2) Since the number of valves installed in the pipeline can be reduced, each valve can be installed at an appropriate position, and the amount of work for installing the valves can be reduced.

[Brief description of the drawings]

FIG. 1 is a vertical sectional side view of a flow control valve with a check function according to a first embodiment of the present invention.

FIG. 2 is a vertical sectional side view for explaining a function of a flow control valve with a check function in FIG. 1;

FIG. 3 is a vertical sectional side view for explaining a function of a flow control valve with a check function in FIG. 1;

FIG. 4 is a longitudinal sectional side view of a flow control valve with a check function according to a second embodiment of the present invention.

FIG. 5 is a partial vertical sectional side view for explaining a modified example of the flow control valve with a check function of FIG. 1;

6 is a partial vertical sectional side view for explaining a modified example of the flow control valve with a check function shown in FIG. 4;

FIG. 7 is a vertical sectional side view of a conventional flow control valve.

FIG. 8 is a vertical sectional side view of a conventional check valve.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Flow control valve with check function 2 Valve box 3 Inflow path 4 Outflow path 5 Vertical path 6 Valve seat 7 Lid 8 Valve rod 9a, 9b Cylinder 10a, 10b Slide rod 11 Guide 12, 12a, 12b Valve body 13 Handle 14 , 22, 26 Female thread 15, 21 Male thread 16 Packing 17 Packing retainer 18 Cap nut 19 Nut 20, 23 Bolt 24 Flange 24 25 Valve fixing screw 27a, 27b, 27c Fluid drain hole 28 Space 29 Fluid flow hole

Claims (3)

[Claims] 1. A valve in which an inflow channel (3) and an outflow channel (4) are connected by a vertical passage (5), and a valve seat (6) is provided around an outlet of the vertical passage (5). A box (2), a lid (7) for covering the valve box, a valve stem (8) moving up and down in the valve box (2) and the lid (7), and fixed to a lower end of the valve stem (8). A cylinder (9a), a slide bar (10a) having a guide (11) provided at an upper end thereof, which is movable up and down in the cylinder (9a), and fixed to a lower end of the slide bar (10a). A flow control valve with a check function, comprising a valve element (12) that can be seated on a valve seat (6). 2. A valve having an inlet passage (3) and an outlet passage (4) connected by a vertical passage (5), wherein a valve seat (6) is provided around an outlet of the vertical passage (5). A box (2), a lid (7) for covering the valve box, a valve stem (8) moving up and down in the valve box (2) and the lid (7), and fixed to a lower end of the valve stem (8). A bottomless cylinder (9b), a slide rod (10b) movable up and down in the cylinder (9b), and fixed to the lower end of the slide rod (10b), and the valve seat (6).
A flow control valve with a non-return function, characterized by comprising a valve element (12) that can be seated on the valve. 3. A non-return function according to claim 1, wherein a fluid vent hole (27a, 27b, 27c) is provided in at least one of an upper portion and a lower portion of the cylinder (9a, 9b). Flow control valve.