JPS59205074A - Check valve - Google Patents

Abstract

PURPOSE:To make the inner diameter of a valve box so as not to be larger that of a joint fluid pipe line, by locking a valve seat, having a tapered peripheral wall, to an inner wall of the valve box which is provided with an inflow port on one side and an outflow port on the other each, while setting up a valve body similar in type to the valve seat free of slide motion. CONSTITUTION:At a time when a fluid is led in from an inflow port 22 in a normal manner, a valve body 30 slides up to the side of an outflow port 23 till a sliding cylinder part 35 hits a stopper by dint of flowing force of the fluid to be entered from a small valve port 28. Accordingly, there produces a clearance between the valve seat 26 and the valve body 30 whereby the fluid passes through the small valve port 28 and a small hole 29 of the valve seat 26 and flows into the outflow port 23 by way of a small hole 34 and an opening 36 of the valve body 30. On the other hand, when a counter flow happens, the valve body 30 slides till it hits the valve seat 26. At this time, the small valve port 28 of the valve seat 26 is closed up by a blocking wall 31 of the valve body 30, and thereby both small holes 34 and 39 of the valve body 30 and the valve seat 26 become nonconnective so that a flow of fluid is thoroughly intercepted.

Description

Detailed Description of the Invention (Technical Field) The present invention relates to a check valve that is used in general fluid pipes such as water pipes, and opens and closes the flow path in forward and reverse directions by moving the valve body in the axial direction of the flow path. It is related to.

(Prior art) An example of a conventional check valve of this type is the
One disclosed in Japanese Patent No. 653 is known. As shown in Figure 1, this has an inlet 2 on the - side and an outlet 3 on the other side.
a valve body 1 having a large valve opening 4, a valve seat 5 positioned transversely and fixed within the valve housing 1, and a small valve opening 6 disposed within the large valve opening 4; , and a valve body 7 which is movably mounted with respect to the valve seat 5 and capable of restricting the flow of fluid through the large valve port 4; The small valve body 8 is provided with a small valve body 8 capable of restricting the flow of fluid through the small valve port 6, and the small valve body 8 is provided with a small valve body 8 that can stop the flow of fluid through the small valve port 6.
The hub 9 contacts the bearing part 10 provided in the valve box 1 to open both valve ports 6.4, and on the other hand,
When the flow back flows, the small valve body 8 comes into contact with the valve seat 11 of the valve body 7, and the valve body 7 comes into contact with the valve seat 5, so that the circular valve opening 6.4 is closed.

However, since the above-mentioned reverse valve opens and closes the large valve port 4 in the valve box 1 by means of the valve body 7 including the small valve body 8, the opening area of the large valve port 4 is defined as the cross-sectional area of the inlet 2. In order to suppress the pressure loss to a minimum of 1 and to ensure the passage of this fluid, the inner diameter of the valve box 1 where the valve seat 5 is located should be
The inner diameter of the valve, and therefore the fluid line connected to the valve, must be larger than that of the valve.

(Problem) The technical problem of the present invention is to ensure passage of a required amount of fluid and to make the inner diameter of the 7P box not larger than the fluid path.

(Technical means) ijt! The technical means devised to achieve the above-mentioned technical problem is to create an inner wall of a circular box having an inlet on one side and an outlet on the other side, one end of which is open, and the other end of which is open. A cylindrical valve seat with a tapered peripheral wall whose diameter is smaller than the diameter of one end is fixed concentrically, and a cylindrical valve seat with a similar shape to the valve seat is installed in the valve box on the outlet side of the valve seat. A shaped valve body is arranged so as to be able to slide freely in the axial direction and in close contact with the valve seat, and a large number of small parts that do not communicate with each other when the valve body is fitted are arranged on the peripheral wall of the valve body and the valve seat. A hole is drilled and a small valve port is drilled at the other end of the valve seat, and the total opening area of the small hole in the valve body and the opening area of the small hole in the valve seat and the small valve port are calculated. Each of the sums is larger than 49<cross-sectional area of the inner diameter of the valve box, and a stopper is fixed to the inner wall of the valve box on the outlet side of the valve body to stop sliding of the valve body when the valve is opened. .

(Effect of technical means) During normal flow when fluid is introduced from the inlet, the valve element slides away from the valve seat and toward the outlet due to the 6ft force of fluid entering from the small valve opening of the valve seat, and then touches the stopper. When they come into contact, their sliding stops. As a result, a desired gap is formed between the valve seat and the valve body, and the fluid enters the gap through the small valve opening and the small hole in the valve seat, and then from this gap through the small hole in the valve body to the outlet. flows to At this time, the sum of the opening area of the small valve opening and small hole of the valve seat [1 area of the opening, and the ~ij opening area of the small hole of the valve body is n1, respectively]
Since the cross-sectional area is larger than +15 of the inner diameter of the box, passage of a certain amount of fluid is ensured.

On the other hand, when backflow occurs due to some reason, the valve body receives the flow force of the fluid at the other end, and the flow from the stopper
71. slides toward the valve seat, fits tightly against the valve seat, and stops. At this time, the small valve port is connected to the other end of the valve body, and the small holes of the valve body and the valve seat do not communicate with each other, so the fluid flow r2 is completely blocked and the valve is closed. It is closed and the backflow stops. Therefore, the inner diameter of the valve box does not need to be larger than the 6ii single body back passage connected to the inlet and outlet, and thus the cell can be made small and compact.

(Samurai effect) When the valve body approaches the valve seat due to backflow and is nearly fully open, the fluid entering from the small hole in the valve body hits the non-small hole part of the valve seat, changes its direction almost at right angles, and closes the valve. The flow will flow from the small hole in the seat and the small valve opening to the inlet, but at this time, the fluid between the valve body and the non-small hole part of the valve seat, which face each other, is compressed and becomes resistance, which acts as a buffer. The valve body closes slowly,
In addition to being lightweight, the water hammer has advantages such as the 114i construction and the 12c construction, which is easy to manufacture.

(Example) We would like to congratulate you on the implementation of this invention.

Referring to Figure 2.3, 21 has an inlet 22 on one side and I on the other side.
K is a cylindrical box having an outlet 23, and an outlet 23I rule is formed on the inner wall of this valve box 21, and the diameter of the inflow outlet 22A is larger than the diameter of the outlet 23J. A cylindrical valve seat 26 with a reduced tapered peripheral wall 25 is fixed concentrically via a mounting base 27 . Valve J presentation 26
A small valve port 28 is formed in the wall surface on the side of the inlet 22, and a large number of small holes 29 are formed in the peripheral wall 25 and the mounting base 27. The openings rI of these small holes 29 and small valve ports 28!
One product of Tokuwa is larger than the cross-sectional area of the inner diameter of the valve box 21.

Inside the valve box 21 on the outlet 23 side from the square 141M 26,
A cylindrical valve body 30 having a similar shape to the flow valve seat is arranged to be slidable in the axial direction and can be inserted into the valve seat 26 from the opening and tightly fitted to the inner surface of the valve seat 26. Inflow port 22 of valve body 30
The side wall surface is a closing wall 3 that can open and close the small valve port 28 of the valve seat 26.
Also, when the valve body 30 is fitted to the valve seat 26,
Valve body 30v) A large number of small holes 34 that do not communicate with the small holes 29 of the valve seat 26 are bored in the peripheral wall 32 and the base 33.
ing. The total opening area of the small holes 34 is larger than the cross-sectional area of the inner diameter of the valve body 21. A cylindrical stopper 3 having an opening 36 is provided on the inner wall of the valve box 21 on the side of the outlet 23 from the piece 30.
7 is fixed, the sliding cylinder portion 35 of the valve body 30 comes into contact with the valve body 30 during normal flow, and further sliding of the valve body 30 is stopped.

Next, the operation of the MiJ example will be explained.

During normal flow when fluid is introduced from the inlet 22, the valve body 3
0 slides away from the valve seat 26 and toward the outlet 23 side due to the flow of fluid entering from the small valve port 28 of the valve seat 26, and slides toward the sliding cylinder portion 35.
When it comes into contact with the stopper 37, its sliding stops and the fully open state shown in FIG. 2 is achieved. As a result, a desired gap is formed between the valve seat 26 and the valve body 3o, and the fluid enters the gap through the small valve port 28 and the small hole 29 of the valve seat 26, and then from this gap, the valve body 30 is opened. Through the small hole 34 and through the opening 36, the outlet 2
Flows to 3. At this time, the small valve port 28 and small hole 29 of the valve seat 26
Since the sum of the opening areas of the valve body 30 and the sum of the opening areas of the small holes 34 of the valve body 30 are each larger than the cross-sectional area of the inner diameter of the valve body 21, the required life span of the fluid is II. 'IW is maintained.

On the other hand, if backflow occurs for some reason in the above state, the valve element 30 receives the fluid intensively at the blocking wall 31 and slides away from the stopper 37 toward the valve seat 26.

When the valve body 3o approaches the valve seat 26 and becomes fully closed as shown in FIG. i (changed to the E angle and flows from the small hole 29 of the valve seat 26 and the small valve port 28 to the inlet 22, and at this time, the cAL body between the valve body 30 and the non-small hole part of the valve seat 26 facing each other is compressed, becomes a resistance, acts as a buffer, and then the valve body 30 is compressed as shown in FIG.
The outer surface of the valve part 26 comes into close contact with the inner surface of the valve part 26, and stops (the 21st wholesale line (π)).
One PIT 128 is installed in the closing wall 31 of the valve body 30,
And the small holes 34 and 39 of the valve body 30 and the valve seat 26 are
Since i+'-J19L does not match, fluid flow is completely cut off and the valve is closed, stopping backflow.

FIG. 6 shows another embodiment of this invention.
Insertion of valve 1% 46 and valve body 50 into valve box 41:
This embodiment differs from the above embodiment in that the sizes of the valve body 46.50 are reversed in order to enable the inner surface of the valve body 50υ) to be tightly fitted to the outer surface of the valve seat 46, and the sizes of the valve body 46.50 are reversed. Since the structure of the parts is the same as that of the previous embodiment, similar parts are indicated by adding 20 to the reference numerals of the above embodiment, and detailed explanations are omitted.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional front view of the conventional example, Fig. 2 is a longitudinal sectional front view of the embodiment of the present invention, Fig. 3 is a longitudinal sectional view taken along line [1-Ill] of Fig. 2, and Fig. 4.5. The figure is an enlarged sectional view of the main part for explaining the operation, and FIG. 6 shows another embodiment of the present invention.
It is a front view of vtlJr. 21...Valve box 22...Inflow port 23...
η outlet 25...peripheral wall 26...valve seat
28...Small valve port 29...Small hole 30.
... Valve body 34 ... Small hole 37 ... Stopper qj 1 person

Claims (1)

[Claims] 1. The inner wall of a cylindrical valve box having an inlet on one side and an outlet on the other side is provided with a tapered peripheral wall that is open at one end and has a diameter at the other end smaller than the diameter at the one end. A cylindrical valve body having a similar shape to the valve seat is slidable in the axial direction within the valve box on the outlet side of the valve seat, and is tightly attached to the valve seat. The peripheral wall of the valve body and valve seat is provided with a number of small holes that do not communicate with each other when the valve body is fitted, and a small valve opening is provided at the other end of the valve seat. and the sum of the opening areas of the small holes in the valve body and the sum of the opening areas of the small holes and small valve cap in the valve seat are set to be smaller than the cross-sectional area of the inner diameter of the valve box, The reverse valve further comprises a stopper fixed to the non-phase inner wall on the outlet side of the valve body to stop sliding of the valve body when the valve is opened.