JPS6217471A - Sliding valve - Google Patents

Abstract

PURPOSE:To improve the sliding operability of a valve plug by providing a valve plug expanding/shrinking mechanism bringing the valve plug into contact with valve seats at fully opened or fully closed positions and separating it during the sliding process of the valve plug. CONSTITUTION:A valve plug 1 is dividedly formed into two portions 1A, 1B individually contacting individual valve seats 4, and irregularly coupled slant cam faces (a), (b) performing cam actions for contact faces between these split portions in the sliding operation direction of the valve plug are formed. An elastically energizing spring 5 is provided on the side keeping both split portions 1A, 1B close. During the sliding operation process of the valve plug 1 under an intermediate opening condition, the valve plug 1 is integrally slided with both split portions 1A, 1B kept in proximate condition by the energizing force of the spring 5.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a sliding valve, and more particularly, a pair of annular valve seats that individually contact and seal the front and back surfaces of a sliding valve body are attached to a valve box. and insert the front and back surfaces into the corresponding valve seat,
A valve body expansion/contraction mechanism is provided that presses the valve body tightly when it is in the fully open and fully closed positions, and separates it during the valve body sliding process. This invention relates to a sliding valve that achieves extremely high sealing performance while achieving both.

[Conventional technology]

Conventionally, the above-mentioned sliding valve has a valve Wi as shown in FIG.
(The annular valve seat (4) fitted in 21 is attached to its back side end surface (
4M) An annular valve seat (4) was press-fitted into the valve body (2) K in order to prevent the valve body (1) from being pulled out due to the fluid pressure acting on the valve body (2).

(No references can be provided.) [Problems to be solved by the invention] However, because of the press-fitting structure, high dimensional accuracy is required in the processing of the valve body and the annular valve seat, and it is difficult to assemble and disassemble the valve. formula,
During repair, special equipment is required to attach and detach the annular valve seat.
We are afraid that there will be disadvantageous problems in terms of production and maintainability.

Moreover, even if a press-fitting structure is adopted, the fluid pressure is, for example, 5.
In high-pressure fluid systems with pressures of over 1,000 psi, the annular valve seat may come out unexpectedly, and when it does, the valve seat contacts and interferes with the valve body, making it difficult to slide the valve body. Problems such as lack of smoothness and inhibition of the expansion/contraction function of the valve body still occur.

It is an object of the present invention to prevent the annular valve seat from being pulled out due to fluid pressure by a rational improvement, regardless of the press-fit configuration.

[Means for solving problems]

The characteristic structure of the sliding valve according to the present invention is that a pair of annular valve seats that individually contact and seal the front and back surfaces of the sliding valve body are fitted into the valve box, and the front and back surfaces are connected to the corresponding valve seats. On the other hand, the valve body is in pressure contact when the valve body is in the fully open and fully closed positions, and
A valve body expansion/contraction mechanism is installed to separate the valve body during the valve body sliding process.
There are nine locking devices for restricting the valve seats from approaching each other, and their functions and effects are as follows.

[For production]

In other words, the annular valve seat is pulled out due to fluid pressure, and the pulled out valve seat comes into contact with the contracted valve body during the sliding operation process. This is avoided by the locking action of the tool.

〔Effect of the invention〕

As a result, there is no need for the conventional press-fitting configuration to prevent the valve from coming out, so it is easier to manufacture and process the valve box and annular valve seat that fit together, and the assembly and dimensions of the valve can be easily adjusted. The structure allows the annular valve seat to be easily attached and detached without the need for any special equipment during overhaul, inspection and repair, greatly improving manufacturability and maintainability.

Moreover, with the conventional press-fitting configuration, there is a risk of it coming out when the fluid pressure is extremely high, but with the present invention, this is due to the locking action of the locking tool, so there is a risk of it coming out. Even if a high-pressure fluid system is used for cleaning, it is possible to reliably avoid the abutting action on the valve body due to removal, and improve the sliding operability of the valve body.
It was possible to maintain good queuing and throttling functions at all times, and the reliability of the valve against high-pressure fluids was greatly improved.

In addition, if an embodiment configuration is adopted in which the locking tool allows the annular valve seat to approach minutely, while maintaining the above-mentioned effects, the annular valve seat can be held close to the annular valve seat when the valve is fully closed and when the valve is fully open. It is possible to realize a so-called bloating seat in which the fluid pressure acting on the back side end face is brought into pressure contact with the valve body in the expanded state, and there is an advantage that sealing performance can be further improved.

〔Example〕

Next, embodiments of the present invention will be described based on the drawings.

As shown in Figure 1, a plate-shaped valve body (1) with a button and a flow passage hole (f) is slidably installed inside the valve body (2), and the flow passage in the valve body (Fl is the valve body (F)). 1) A valve that slides the valve body (1) between an open position where the valve communicates through the flow passage hole (f) and a closed position where the flow passage iFl in the valve box is blocked by the valve body (1). A rod (3) is provided, and a pair of annular valve seats (4) that individually contact and seal the front and back surfaces of the valve body (1) are fitted inside the flow passage opening in the valve box, This constitutes a gate valve.

As shown in FIGS. 1 and 2, the valve body (1) is divided into two parts (IA), (
IB) K divisions are formed, and these division parts (IA
), (IB) An inclined cam surface IJLI with a concave-convex shape that acts as a cam on the contact surface between the two in the direction of sliding operation of the valve body.
, (bl), and the valve stem (3) is interlocked and connected to the divided portion (IA) formed with the concave cam surface (al).

A spring (5) for elastically biasing the divided parts (IA) and (IB) is attached to the side that brings the divided parts (IA) and (IB) closer together, and the divided part (IB) has a convex cam surface (bl).
A stopper (6) is provided to restrict the sliding range of the spring (5), so that during the sliding operation process of the valve body (1) in the intermediate opening portion, the spring (5) is Bilateral parts (IA) due to biasing force.

(IB) in a state where they are brought close to each other, in other words, the valve body (
With the front and back surfaces of 1) separated from the corresponding valve seats (4), both divided portions (IA) and (IB) are integrally formed by their uneven cam surfaces fJLl, (blO). As shown in FIG. 2 (b), the stopper (6) is operated near the fully closed position and near the fully open position of the valve to form a convex cam surface fbl, and as shown in FIG. After stopping the sliding of IB), in the next state, the concave cam surface (
As only the divided part (IA) that formed the JLI continues to be slid, both divided parts (IA) and (IB) are separated against the spring (5) by the cam action of the cam surface fil e (bl). The front and back surfaces of the valve body (1) are respectively pressed against the corresponding valve seats (4) in the valve fully closed position and the valve fully open position.

In other words, the above-mentioned expansion/contraction function of the valve body (1) allows extremely high sealing performance to be achieved while maintaining high sliding operability of the valve body fil.

In the figure (d) is a guide member that guides the sliding movement of the valve body (1).

jg As shown in Figures 3 to 5, an annular valve seat (4) with a contact sealing seat ring (7) fitted on the end face on the valve body side.
is fitted into the annular recess (2A) K of the valve body (2), and between the pair of annular valve seats (4) is a pair of plate-shaped spacers (which restrict the approach of the valve seats (4)). 8), and by the action of the spacer (8), the thickness dimension (dl) of the valve body (1) in which the separation dimension (dl) between the valve seats (4) is reduced during the sliding operation process. This is to prevent the value from becoming smaller than the actual value.

During the sliding operation process of the tab and valve body, the annular valve seat (4) is pulled out by fluid pressure and comes into contact with the valve body (1), and due to this contact action, a convex cam surface (bl The valve body division part (IB) acts as a wedge against the valve body division part (IA) which forms the concave cam surface (&), and the wedge action prevents the valve body (1) from sliding. The spacer 181K is configured to prevent this from being inhibited.

In addition, in a range where the separation dimension (dt) between the valve seats (4) is larger than the valve body thickness dimension (dl) in the contracted state, a spacer (8) is used to allow each valve seat (4) to slide. Therefore, when the valve is fully open and when the valve is fully closed, each annular valve seat (4) (especially The valve seat (located on the upstream side of the flow path) is brought into pressure contact with the front and back surfaces of the corresponding valve body (1), thereby realizing a so-called floating seat.

In the figure, +91 Vi is a 90 ring interposed between the annular valve seat (4) and the valve box (2).

A locking pin α0 is installed on the valve seat (4) to engage with the concave stepped portion of the spacer (8), and a spacer [8] is inserted between the locking pin αa and the guide member (Gl). The spacer (8) is held by the engaging action and pinching action of these locking pins αG.

[Another example]

Next, another embodiment of the present invention will be described.

A spacer (8) that completely prevents the annular valve seats (4) from approaching each other may be interposed between the valve seats (4).

Concave cam surface + ILI to hold spacer (8)
The fully formed valve body dividing member (IA) and spacer (8) may be connected and supported, and the specific mounting structure can be improved in various ways.

Instead of using the spacer (8), a hook-shaped tool may be attached to the valve box (2) that locks each valve seat (4) so as to restrict the valve seats (4) from approaching each other. Good, Benza (
4) The attachment #i which restricts the approach of the valve seats (4) to each other by the locking action on K can be modified in various ways, and these attachments are collectively referred to as the locking device (8).

The specific structure for expanding and contracting the valve body (11) can be improved in various ways, and these structures are collectively referred to as the expansion and contraction mechanism 11LI.
@ (referred to as bl.

The slide valve employing the valve seat mounting structure according to the present invention is suitable for use with high-pressure fluid, but the target fluid is not limited.

[Brief explanation of drawings]

Figures 1 to 6 show embodiments of the present invention, with Figure 1 being a longitudinal cross-sectional view, Figures 2 and 2 (G4) and (B) showing the operating state of the valve body, and Figure 8 showing the main parts. 4 is an enlarged cross-sectional view of the same, and FIG. 5 is an enlarged perspective view showing the spacer mounting structure. FIG. 6 is an enlarged sectional view showing a conventional example. (1)... Valve body, (2)... Valve box, (
4)... Annular valve seat, (8)... Locking tool, (al, (bl... Valve body expansion and contraction mechanism. Agent: Patent attorney Shudai Kitamura 5) Figure g61!

Claims (1)

[Scope of Claims] [1] A pair of annular valve seats (4) that individually contact and seal the front and back surfaces of the sliding valve body (1) are fitted into the valve box (2), and a valve body expansion/contraction mechanism (a) that presses the valve body (1) against the corresponding valve seat (4) when the valve body (1) is in the fully open and fully closed positions, and separates it during the valve body sliding process;
), (b) and a locking device (8) for restricting the valve seats (4) from approaching each other. [2] The slide valve according to claim 1, wherein the locking device (8) is a spacer arranged between the valve seats (4). [3] The slide valve according to claim 1, wherein the locking tool (8) allows the valve seats (4) to approach each other slightly.