JPH032065Y2 - - Google Patents

Description

[Detailed explanation of the invention] (a) Industrial application field This invention is a double-door type check valve that prevents backflow of fluid as piping equipment for fluid pressure delivery, and is intended for relatively large-diameter piping. This relates to stop valves.

(B) Prior art A double door type check valve in which a pair of valve blades are hingedly supported in a valve case and opened and closed in the flow direction is described in Japanese Patent Application Laid-open No. 52-26628, etc. The hinge portion of the wing is attached directly to the hinge pin, and there has been no guarding means to prevent wear on the hinge portion.

(c) Problems to be solved by the invention Conventionally, the hinge portion of the valve blade in a double-door check valve is directly attached to the hinge pin, and a washer bearing is used as a means to isolate the adjacent ends of the hinge portions that rotate adjacently. was used at most.

As a result, the hinges and hinge pins were severely worn and the valve blades could not be opened and closed smoothly.

(d) Means for solving the problem The present invention inserts at least two adjacent hinges that are pivotally supported by hinge pins, and includes a flange that is interposed between each end face of the adjacent hinges to protect them. By interposing the provided pipe bearing between the hinge pin and the hinge part, friction between adjacent hinges is eliminated, wear on the hinge part is greatly reduced, and the opening and closing of the valve blades is made smoother.

(e) Examples Examples of the present invention will be described below with reference to the drawings. Reference numeral 1 is a valve box with a hinge pin 2 extending through the center of the inside. A pair of valve blades 4a and 4b are rotatably supported on the hinge pin 2 by hinge portions 41 and 42, respectively, with a pipe bearing 3 interposed therebetween.

The pipe bearing 3 is the hinge part 41, 4 of the valve blade.
2 and into which the hinge pin 2 is inserted, and the adjacent ends 43, 4 of the hinge parts 41 and 42.
4 and a flange 32 separating the hinge pin 2 from the hinge parts 41 and 42.
It is also rotatably installed. The bearing effect can be enhanced by using a material such as Teflon for the pipe bearing 3. Alternatively, the pipe main body 32 may be extended, and a plurality of flanges may be provided to allow the spring 6 to pass therethrough and separate the springs from each other. One end of the valve box 1 is the valve blade 4
The valve seat 5 is provided with valve holes 5a and 5b that are sealed by holes 5a and 4b. 6 is attached to the hinge pin 2 with a spring, and presses the valve blades 4a, 4b toward the valve seat 5 from behind to maintain the seated state. A flow path 7 is provided behind the valve holes 5a, 5b, and the fluid rotates the valve blades against the spring 6, and the fluid flows in and flows through the valve holes 5a, 5b.

When the fluid pressure in the flow direction decreases, the spring 6
Due to this action, the valve blades 4a, 4b are seated on the valve seat 5, sealing the valve hole and preventing backflow. 8 is a stop bar that controls the upper limit of rotation of the valve blade, and 9 is a sealing material that seals the valve hole.

(F) Operation and Effect of the Invention Since the present invention is constructed as described above, the hinge portion does not directly rub the surface of the hinge pin 2, and the adjacent ends 43 and 44 do not slide against each other.
Therefore, the wear of the hinge part is greatly reduced, and
The service period can be further extended by simply replacing the worn pipe bearing 3.

Further, since the pipe bearing 3 serves as a common support shaft for the hinge portions 41 and 42 passing through, the operation of the valve blades is stabilized, and the fixed flange enhances the bearing effect. In addition, the frictional force is concentrated on the pipe bearing, protecting the hinge hole and hinge pin, so the material can be used as a consumable item.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, in which Fig. 1 is a partially cutaway plan view, Fig. 2 is an enlarged cross-sectional view showing the interposed state of the pipe bearing, Fig. 3 is a vertical side view, and Fig. 4 is a partially cutaway plan view. The figure is a perspective view of a pipe bearing. 1... Valve box, 2... Hinge pin, 3... Pipe bearing, 31... Pipe body, 32... Flange, 4a, 4b... Valve blades, 41, 42... Hinge part, 43, 44... Adjacent End, 5... Valve seat, 5
a, 5b... Valve hole, 6... Spring, 7... Channel, 8... Stop bar, 9... Seal material.

Claims (1)

[Scope of utility model registration request] In a check valve that opens and closes in the flow direction, a pair of valve blades that are pivotally supported by a hinge pin extending across the center of the valve case body pass through at least two hinges that are pivotally supported by the hinge pins adjacent to each other. A pipe bearing is installed in the hinge part, which is characterized in that a pipe bearing is provided between the hinge pin and the hinge, and the pipe body is provided with a flange that separates the adjacent ends of each hinge in the pipe body through which the hinge pin is rotatably inserted. Interposed check valve.