JPH0649866U - Swing check valve - Google Patents

Abstract

(57) [Summary] [Purpose] The swing check valve itself is provided with a flow rate adjustment function, which eliminates the need for opening and closing the pipeline and installing a valve for flow rate adjustment. [Structure] The valve body opening adjustment bolt 12 is attached to the lid 11 of the valve box 1.
Is screwed into the valve chamber 2 to adjust the protruding length of the valve body opening adjustment bolt 12 to the inside of the valve chamber 2 so that the opening degree of the valve body 9 can be easily adjusted from the outside of the valve box 1.

Description

[Detailed description of the device] [Industrial applications]

 The present invention relates to a swing type check valve used in a fluid transportation pipe.

[Prior art]

As shown in FIG. 3, a conventional swing-type check valve used in a fluid transport pipe for transporting a fluid such as water or chemicals has a hinge pin p when the fluid flows in a forward direction indicated by an arrow A. The valve body v, which is rotatably suspended around the valve body, is opened by fluid pressure to a position indicated by a chain double-dashed line, that is, a position corresponding to a stopper c provided in the valve box a, to allow the fluid body to pass therethrough. When the flow in the forward direction stops and the fluid starts to flow in the reverse direction indicated by arrow B, the valve body v returns to the position shown by the solid line by its own weight, and the valve body valve attached to the valve body v is attached. The seat s ₁ comes into contact with the valve seat s ₂ with a valve box attached to the valve box a, and the valve is closed by the fluid pressure that starts to flow backward, thereby preventing the fluid from flowing backward. (See, for example, Japanese Utility Model Laid-Open No. 60-175965.) In such a conventional swing type check valve, the stopper c is fixed at a fixed position, so that the opening degree of the valve body v can be changed. It cannot be done and remains constant.

[0001]

[Problems to be solved by the device]

 As described above, the conventional swing-type check valve cannot adjust the opening degree of the valve element and has a function of flowing the fluid in only one direction. Later, a sluice valve, an elliptical valve, a diaphragm valve, etc. were installed, and the opening and closing of the valves and the flow rate were adjusted by adjusting the opening of these valves.

However, by installing both the swing type check valve and the valve for opening / closing and adjusting the flow rate in this way, the equipment cost becomes high, the piping space becomes small, and the labor and cost of maintenance are increased. There are problems such as extra costs.

The present invention has been made in view of the above-mentioned problems of the prior art, and a swing-type check valve that does not require a separate valve for opening and closing a pipe or adjusting a flow rate is provided. The purpose is to provide.

[0004]

[Means for Solving the Problems]

 In order to achieve the above object, the swing check valve of the present invention is summarized as having a means capable of adjusting the opening degree of the valve body from the outside of the valve box. It

[0005]

[Action]

 Since the swing-type check valve of the present invention has means for adjusting the opening degree of the valve body from the outside of the valve box, the desired check valve can be opened from the outside of the valve box without opening the valve box. The degree of opening can be adjusted, and the flow rate of the fluid can be easily adjusted.

[0006]

【Example】

 Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a longitudinal sectional view showing an embodiment of the swing type check valve of the present invention. In FIG. 1, a valve chamber 2, an inflow port 3 and an outflow port 4 are formed inside a valve box 1. Outer surfaces of the inflow port 3 and the outflow port 4 are provided for connection with pipes or other valves. A connecting portion 5 such as a flange is provided. A valve seat 6 with a valve box is provided at the inner end of the inlet 3 on the valve chamber 2 side.

A hinge pin 7 is attached to a protrusion formed on a wall of the valve chamber 2 on the inlet 3 side in a direction crossing the inlet 3, and an arm 8 is rotatably suspended around the hinge pin 7. The valve body 9 is screwed onto the arm 8 by a nut, and the valve body-equipped valve seat 10 is attached to the valve body 9.

A lid 11 is fixed to the valve box 1 with bolts and nuts above the valve box 1 to cover the valve chamber 2. The lid 11 is provided with a screw hole, and the screw hole has a head located outside the lid 11 (hence outside the valve box 1) and the other end located inside the valve chamber 2 to adjust the valve opening degree. The node bolts 12 are screwed together, and the protruding length of the valve body opening adjustment bolts 12 into the valve chamber 2 can be adjusted from the outside of the valve box 1 by a tool such as a spanner. A handle may be attached instead of the hexagon bolt. A lock nut 13 for fixing the valve body opening adjustment bolt 12 is provided on (outside) the lid 11. Further, as shown in FIG. 2, by providing the opening degree display plate 14 after the bolt, the opening degree of the valve body 9 can be easily known.

Next, a method of adjusting the flow rate by the swing check valve will be described. First, in FIG. 1, the tip of the valve body opening adjusting bolt 12 is moved to the position of (that is, the position of the arm 8 which closes the valve body 9 by its own weight as shown by the solid line). Adjust the protruding length. This operation can be easily performed by rotating the head portion of the valve body opening adjustment bolt 12 from the outside of the lid 11. As a result, the arm 8 is pressed by the valve body opening adjustment bolt 12 even if the fluid tries to flow from the inflow port 3, so the valve body 9 is closed and the valve seat with valve body 10 has the valve seat with valve box. It remains in contact with 6 and thus the flow rate is zero.

When the protrusion length of the valve body opening degree adjusting bolt 12 is adjusted so that the tip of the valve body opening degree adjusting bolt 12 comes to the position of, it is repelled by the fluid pressure flowing from the inflow port 3. Since the valve body 9 is stopped by hitting the tip of the valve body opening adjustment bolt 12 in which the arm 8 is in the position of, the state of the chain double-dashed line, that is, the valve body 9 causes the inflow port 3 and the outflow port 4 to be stopped. The flow rate is maximized by opening the connecting flow path to the so-called fully open state where it is not blocked.

Similarly, the valve body opening adjustment bolt 12 is adjusted so that the tip end thereof is in the middle of and, so that the opening degree of the valve body 9 is continuously adjusted from the fully closed state to the fully opened state. Therefore, the flow rate can be continuously and easily adjusted between 0 and the maximum.

Although the valve body opening adjusting bolt 12 is provided on the lid 11 in the above embodiment, it may be provided on the valve box 1. At the part where the valve body opening adjustment bolt penetrates the lid or the valve box, the outer cylinder is a sleeve that does not move up and down only by rotation, and the inner surface is provided with a mechanism that only moves up and down with a screw. It is more preferable to have a structure with increased water tightness between the two.

[Effect of device]

 As is clear from the above description, the swing-type check valve of the present invention has an original function of preventing the reverse flow of the fluid, and in addition, the opening degree of the valve body can be arbitrarily adjusted from the outside of the valve box. The fluid flow rate can be continuously and easily adjusted to an arbitrary flow rate from 0 (closed off) to the maximum (fully open). Therefore, it is not necessary to separately install a valve for opening and closing or adjusting the flow rate, and it is possible to reduce equipment costs, maintenance costs, and installation space.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing an embodiment of a swing check valve according to the present invention.

FIG. 2 is a partial front view showing a state in which an opening degree display plate is provided.

FIG. 3 is a vertical sectional view showing a conventional technique.

[Explanation of symbols]

 1 valve box 2 valve chamber 7 hinge pin 8 arm 9 valve body 11 lid 12 valve body opening adjustment bolt 13 lock nut

Claims (1)

[Scope of utility model registration request] 1. A swing-type check valve comprising means capable of adjusting the opening of a valve body from the outside of a valve box.