JPH033099B2 - - Google Patents

Description

Detailed Description of the Invention [Field of Industrial Application] In order to improve sealing performance, the present invention provides a valve seat for an upstream seat surface of a sliding valve body that opens and closes a flow path, which a pressure receiving part that is movably provided in the valve box and receives the fluid pressure of the flow path and presses against the seat surface of the valve seat when the valve is opened;
The present invention relates to a sliding valve formed on the valve seat.

[Conventional technology]

In the conventional sliding valve mentioned above, the seat surface and valve seat are
It was simply formed on an oblique plane.

[Problem that the invention seeks to solve]

However, when the valve is open, the valve seat receives fluid pressure at the pressure receiving part and is in pressure contact with the seat surface, so when the sliding valve body tries to open the valve, the valve seat acts as resistance. There was a risk that the sliding operation of the valve body would become difficult or that the valve body would become distorted and become stuck.

An object of the present invention is to enable a slide valve to open smoothly during a valve opening operation while maintaining high sealing performance when the valve is closed.

[Means for solving problems]

The characteristic structure of the sliding valve of the present invention is that a recess is formed in the valve seat, and a connecting groove is formed in the seat surface to communicate the recess and the flow path at the initial stage of opening the valve. , as follows.

[Effect]

In other words, when the sliding valve body is opened, the recess formed in the valve seat at the initial stage of valve opening communicates with the flow path through the connection groove formed on the seat surface, so that the fluid pressure in the flow path increases. The recess receives the force and converts it into a force that moves the valve seat away from the seat surface, and the pressure of the valve seat against the seat surface, which is received by the pressure receiving section, weakens.

〔Effect of the invention〕

Therefore, when the valve is closed, the pressure-receiving part strengthens the pressure of the valve seat against the seat surface to maintain high sealing performance, while when the valve is opened, the valve body slides smoothly against the valve seat with a light operating force. The valve can be opened while moving the valve, and as a result, the performance and operability of the sliding valve can be improved with a simple structure.

[Example] Next, an example of the present invention will be described based on the drawings.

As shown in FIG. 3, a plate-shaped valve body 1 having a flow passage hole f is slidably installed inside a valve box 2, and a flow passage F in the valve body is formed through the flow passage hole f of the valve body 1. A valve rod 3 is provided for slidingly operating the valve body 1 between an open position where the valve body communicates with the valve body and an open position where the flow path F in the valve box is blocked by the valve body 1. A pair of annular valve seats 4 which individually contact and seal against the back surface are fitted into the flow passage openings in the valve box, thereby forming a gate valve.

As shown in FIGS. 2 and 3, the valve body 1 is divided into two parts 1A, which contact each valve seat 4 separately,
1B, and those divided parts 1
Inclined cam surfaces a, b in the form of concave and convex engagement that act as a cam on the contact surfaces between A and 1B in the direction of sliding operation of the valve body.
divided portion 1 formed with a concave cam surface a.
A valve stem 3 is interlocked and connected to A.

A spring 5 for elastically biasing the divided portions 1A and 1B is attached to the side that brings the divided portions 1A and 1B closer to each other, and the divided portion 1B is formed with a convex cam surface b.
A stopper 6 is provided to restrict the sliding range of the spring 5, and during the sliding operation process of the valve body 1 in the intermediate opening state, the spring 5
The two divided parts 1A, 1B are brought close to each other by the biasing force of the two divided parts 1A, 1B. uneven cam surfaces a, b
so that they slide integrally due to the engagement action of
Further, as shown in FIG. 2B, the stopper 6 is activated near the valve fully closed position and near the valve fully open position to prevent the sliding of the divided portion 1B forming the convex cam surface b, and the concave cam As only the divided portion 1A forming the surface a continues to be slid, both the divided portions 1 are separated by the cam action of the cam surfaces a and b.
A and 1B are separated against a spring 5, and the front and back surfaces of the valve body 1 are respectively pressed against the corresponding valve seats 4 at the fully open position and the fully open position.

In other words, due to the expansion/contraction function of the valve body 1 as described above,
It is constructed so that extremely high sealing performance can be achieved while maintaining high sliding operability of the valve body 1.

Among the annular valve seats 4, as shown in FIG.
is provided in the valve box 2 so as to be movable near and far with respect to the seat surface A, and a pressure receiving part 7 is provided for receiving the fluid pressure of the flow path F to press the valve seat 4 against the seat surface A when the valve is closed. forming a recess 8 in the valve seat 4;
A connecting groove 9 that connects the recess 8 and the flow path F during the valve opening period.
is formed on the sheet surface A.

Furthermore, a bypass groove 10 is formed in the seat surface A to connect the recess 8 and the space S in the valve box 2 when the valve is closed, thereby reducing the pressure within the recess 8.

Therefore, when the valve is closed, as shown in Figure 1A,
The pressure receiving part 7 receives fluid pressure and presses the valve seat 4 against the seat surface A, and at this time, the pressure in the recess 8 is communicated with the space S through the bypass groove 10 and drops, and the pressure in the recess 8 is lowered by the valve seat 4 against the valve body 1. On the other hand, at the initial stage of opening the valve, as shown in FIG. 8 and changes the overall pressure to a force in the direction of separating the valve seat 4 from the seat surface A, weakening the pressing force of the pressure receiving part 7 against the seat surface A of the valve seat 4, and causing the valve body 1 to slide. make it easier.

In the figure, 11 is an O-ring for sealing between the valve box 2 and the valve seat 4, and 12 is a grease supply path.

[Another example]

The valve body 1 may be composed of a single valve body other than the two divided parts 1A and 1B, and these parts are simply referred to as a sliding valve body.

[Brief explanation of drawings]

The drawings show an embodiment of the sliding valve according to the present invention, and FIGS. 1A and 2B are diagrams explaining the operation of the main parts, FIGS. 2A and 2B are diagrams explaining the operation of the main parts, and FIG. It is an overall vertical cross-sectional view. 1...Sliding valve body, 2...Valve box, 4...Valve seat, 7
...Pressure receiving part, 8...Recess, 9...Connection groove, A...
Sheet surface, F...flow path.

Claims (1)

[Claims] 1 A valve seat 4 for the upstream seat surface A of the sliding valve body 1 that opens and closes the flow path F is provided in the valve box 2 so as to be movable near and far with respect to the seat surface A, and receives the fluid pressure of the flow path F. The valve seat 4 is a sliding valve in which a pressure receiving part 7 is formed in the valve seat 4 to press against the seat surface A when the valve seat 4 is opened, and a recess 8 is formed in the valve seat 4.
, and a connecting groove 9 is formed in the seat surface A to communicate the recess 8 and the flow path F in the initial stage of opening the valve.