JPS61184276A - Sluice valve - Google Patents

Abstract

PURPOSE:To prevent fluid from intrusion into a valve body by making always a planar valve seat surround, enclose and contact a through hole in the valve body when a valve operates from the fully opened condition to the fulley closed one. CONSTITUTION:A plate-like valve body 3 has a parallel seat surface 31 slidably fitting on a seat surface 21 of a valve seat body and a through hole 32 corresponding to a through hole 22 in the valve seat body. The seat surface 31 is formed to include a portion 33 which is a partition wall of flow path when the valve is fully closed. The external outline of the seat surface 21 of valve seat body is formed such that it overlaps the external outline of seat surface 31 of the valve body when the valve is fully opened. Thus, in any positions from the fully opened valve to the fully closed one, the seat surface 21 of valve seat body and the seat surface 31 of valve body keep enclosing and contacting to surround the through hole 22 of valve seat body and through hole 32 of valve body.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a gate valve used in piping for fluids containing large amounts of solid or muddy substances.

(b) Conventional technology Piping for mineral extraction, oil fields, geothermal utilization, civil engineering, etc. often transports fluids containing large amounts of earth, sand, and muddy substances. Such substances float inside the piping and adhere to the valve seat of the valve, preventing it from closing.

Furthermore, over time, these substances accumulate at the bottom of the valve in the open state and solidify, impeding operation, and eventually causing the valve to become unable to open and close. .

In order to cope with the above problem, a gate valve is shown in FIG.

has traditionally been used. As shown in FIG. 6, in the fully open state of the valve, the valve body 61 has its through hole 62 connected to the valve seat body 6.
It is located on the same center as the through hole 64 of No. 3 to form a flow path, and a seat surface 65 surrounding the through hole 62 of the valve body is in sealing contact with a seat surface 66 of the valve seat body. The fluid is as above.

However, due to the sealed contact between the valve body and the valve seat body, the valve is fully opened in the body portion 67 of the main body.

There will be no infiltration. Therefore, even if a fluid containing a large amount of foreign matter such as earth and sand or muddy substances is poured, the bearing surfaces 65 and 66
The valve prevents foreign matter from getting caught between the holes or from entering the body 67 and depositing foreign matter.

It will not leak or become inoperable. .

In the fully closed state of the valve shown in FIG. 7, the partition wall 6B of the valve body I () blocks the flow path, and the seating surfaces 65 and 66 are in sealing contact as in the fully open state, so the fluid flows to the body 67. No leakage occurs, and the fluid is eventually dammed up completely.

(c) Problems to be solved by the invention The problems of the gate valve constructed in this way are shown in Figure 8.

During operation, the valve body shown moves from fully open to fully closed.

In this case, the through hole 62 of the valve body communicates with the through hole 64 of the valve seat body and also communicates with the body 67. Therefore, fluid enters the body, and each time the opening and closing operations are repeated, one foreign object accumulates, making the valve inoperable. This phenomenon has made the gate valve quite ineffective when the valve is used in a half-open position for flow regulation purposes.

In order to solve the above-mentioned problems, the present invention provides a gate valve composed of a parallel valve seat and a valve body having a through hole corresponding to the main body flow path, in which the valve body and the valve body are connected to each other. The seat always surrounds the main body flow/passage and the through hole of the valve body to maintain a sealed contact in all positions of the valve body from fully open to fully open.

It is composed of In addition, the valve seat body is connected to the flow path of the main body.

A sealing means is inserted into the step provided at the intersection of the body and the body so as to be able to slide parallel to the center line of the flow path, and between the outer periphery of the insertion portion of the valve seat body and the inner periphery of the main body step. It has been established. Furthermore, a force is generated between the valve seat body and the main body that presses the valve seat body toward the valve body.

It is equipped with spring means to

(e) Effect The invention works as follows.

The valve body and valve seat are in all positions, from fully open to fully closed.

・3. Since the main body flow path and the through hole of the valve body are always surrounded and in sealed contact with each other, no fluid can enter the body of the main body under any operating state of the valve. Book so that it can slide parallel to the channel centerline.

A valve seat body inserted into the stepped portion of the body, and a sealing means provided between the outer periphery of the insertion portion of the valve seat body and the inner periphery of the stepped portion of the main body.

The pressure of the fluid generates a force that presses the valve seat body against the valve body, thereby making effective sealing contact between the valve body and the valve seat.

When the valve is fully open, there is a pressure difference between the flow path and the body (pressure due to the fluid exists in the flow path, but not in the body).
When the valve is fully closed, the valve seat body on the inflow side is pressed against the valve body from both sides due to the pressure difference between the inflow side and the outflow side in the flow path. be forced to.

The spring means provided between the valve seat body and the valve seat body makes the sealing and contact between the valve body and the valve seat more effective in addition to the pressing force of the valve seat body due to the 1° fluid pressure force.

(f) Embodiment Figure 1 shows an embodiment of the present invention, in which 1 is the main body;
1 and 12 are fluid flow paths, and the same diameter is 1°.
4. Arranged on the core wire. Reference numeral 13 denotes a body for housing the valve body.The valve seat body 2 is located relative to the center line of the flow path.

It has a perpendicular seating surface 21 and a through hole 22 corresponding to the flow path of the main body, and is inserted into a step 14 provided at a location where it intersects with the trunk of the main body, and is parallel to the center line of the flow path. 3 is a plate-shaped valve body, and the seat surface 21 of the valve seat/body
It has a parallel seat surface 31 that is slidably fitted with the valve seat body, and a through hole 32 that corresponds to the through hole 22 of the valve seat body. The seat surface 31 is formed to include a portion 33 that becomes a partition wall of the flow path when the valve is fully closed. . . . Figures 2 to 4 show the sealing contact between the seat surface of the valve seat body and the seat surface of the valve body in this embodiment. The outer shape of the seat surface 21 of the valve seat body is formed so that it overlaps the outer shape of the seat surface 31 of the valve body when the valve is fully open, so that in any position from fully open to fully closed. The seat surface 21 of the valve seat body and the seat surface 31 of the valve body are connected to the through hole 22 of the valve seat body and the through hole of the valve body.

A sealed contact A is maintained surrounding the through hole 32.

In FIG. 5, the valve seat body 2 has a flow path in the stepped portion 14 of the main body.

It is inserted so that it can slide parallel to the center line.

There is. A groove 24 is provided on the outer periphery 25Fc of the insertion portion of the valve seat body, and the O-ring 4 is inserted into the groove 24 on the inner periphery of the stepped portion 14.

and the outer periphery 23 of the valve seat rod insertion portion. For this gap seal.

Therefore, other structures may be used as long as the seal is perfect and does not prevent the valve seat from sliding.

The end surface 25 of the valve seat rod insertion portion and the bottom surface 15 of the stepped portion of the main body.

In between, a disc spring 5 is installed so as to generate a force that presses the valve seat body 2 toward the valve body 3. There is no problem in using other structures as long as the means to impose pressure on the object meet the purpose.

(g) Effect The present invention has the following effects.

(1) Since the seat surface of the valve body and the seat surface of the valve seat body always maintain a sealed contact, foreign matter contained in the fluid will not adhere to the seat surface 1° and impair the valve's closing function. do not have.

(2) The flow path and body of the main body are isolated from each other in all operating positions of the valve, from fully open to fully open.

Foreign matter in the fluid will not accumulate on the body (opening and closing of the valve will not become impossible).

(3) Since fluid pressure does not act on the trunk of the main body, the strength of each part is not required, resulting in a lightweight and inexpensive valve.

(4) Since no fluid enters the body, there is no occurrence of abnormally high pressure due to thermal expansion of the fluid sealed in the body, and no unexpected accidents occur.・

[Brief explanation of the drawing]

Figure 1 is a sectional view showing an embodiment of the present invention, Figures 2-4
The figure is an explanatory diagram showing the relationship between the valve body and the valve seat body in the example.
FIG. 2 shows the valve in the fully open state, FIG. 3 shows the valve in the half-open state, and FIG. 4 shows the valve in the fully closed state. Figure 5 is the same. FIG. 3 is an enlarged cross-sectional view of the main part of the same embodiment. FIG. 6 is a sectional view showing a conventional technique, and FIGS. 7 and 8 are sectional views of essential parts showing the valve in a fully closed state and a half open state, respectively. No. 51 No. 60 6'-7, , J to p also 81

Claims (1)

[Claims] 1. Two planar valve seats parallel to and facing each other provided around the flow path of the main body, and a parallel surface that slides on the planar valve seats and corresponds to the flow path of the main body. In a gate valve configured with a plate-shaped valve body having a through hole, the valve body changes from a fully open state in which the through hole in the valve body and a flow path in the main body completely overlap to a state in which the through hole in the valve body completely overlaps with the flow path in the main body. The gate valve is characterized in that the plane valve seat is formed so as to always surround and seal the through hole of the valve body against movement of the valve body until the valve is completely closed. 2. In the gate valve according to claim 1, a stepped portion is provided at a location where the flow path of the main body intersects with the body portion housing the valve body, and a through hole corresponding to the plane valve seat and the main body flow path is provided. A valve seat body having a valve seat body is inserted so as to be able to slide parallel to the center line of the flow path, and a sealing means is provided between the outer periphery of the insertion portion of the valve seat body and the inner periphery of the main body stepped portion. Features a gate valve. 3. The gate valve according to claim 2, characterized in that a spring means is provided between the valve seat body and the main body to generate a force that presses the valve seat body toward the valve body. gate valve.