JPS5910450Y2 - non-return valve - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a check valve, and particularly to a swing type check valve.

Conventional swing-type check valves of this type have a lever attached to the main body so that it can swing freely, a valve attached to the lever, and a flat disc-shaped valve body with a through hole in the center attached to the valve. That's what happens.

As the lever swings, the valve body of the valve comes into contact with and separates from the valve seat of the main body, allowing fluid to flow in one direction.

However, since conventional check valves use a flat disk-shaped valve body, the contact between the valve body and the valve seat is a surface contact, and therefore there is a problem in airtightness.

Furthermore, since the main body lever is simply attached to be swingable, it is necessary to remove the main body from the piping and perform maintenance and inspection of the parts, which poses a problem in that maintenance and inspection of the parts is complicated.

In view of the above-mentioned problems, the present invention aims to provide a check valve that allows maintenance and inspection of parts without removing the main body from piping, and which is completely airtightly closed.

Hereinafter, one embodiment of the check valve according to the present invention will be described with reference to the accompanying drawings.

The check valve of the present invention in this embodiment includes a main body 1, a lever 2 detachably and swingably attached to the main body 1,
A valve 3 is detachably attached to the lever 2, and an O-ring 4 is detachably attached to the valve 3 with a washer 8 or the like as a holding plate.

The main body 1 is made of bronze and has an outlet 10 at the top and an inlet pipe 11 and an outlet pipe 12 at the side.
are provided in a straight line, and the inlet pipe portion 11
, a shaft outlet 13 is provided in a direction perpendicular to the linear direction of the outlet pipe part 12, and a valve seat 1 is provided on the inlet pipe part 11 side.
4 is provided.

A cap 50 is provided at the outlet 10 of the main body 1, and a cap 50 is provided at the outlet 10 of the main body 1.
An inlet pipe 51 and an outlet pipe 52 are screwed into the outlet pipe portion 12, and a stopper 53 is screwed into the shaft outlet 13.

The lever 2 consists of a tubular shaft attachment part 21, an L-shaped connecting arm part 22, and an annular attachment member 23, and is detachably attached to the main body 1 at the shaft attachment part 21 by a stainless steel shaft 6. And it is attached so that it can swing freely.

The valve 3 has a disk shape, with a protrusion 31 protruding from the center of one side, a recess formed on the other side, and a threaded portion 32 protruding from the center of the recess on the other side. has been done.

The valve 3 is detachably attached to the attachment member 23 of the lever 2 by a split pin 7 at its protrusion.

The outer diameter of the O-ring 4 is approximately equal to the inner diameter of the recess of the valve 3.

The outer diameter of the washer 8 is slightly larger than the inner diameter of the O-ring 4, and the outer peripheral side surface is tapered, and a through hole is formed in the center into which the threaded portion 32 of the valve 3 can be inserted. It is being

While fitting the O-ring 4 into the four parts of the valve 3,
By fitting the washer 8 onto the threaded portion 32 of the valve 3, fitting the washer 8 into the O-ring 4, and screwing the nut 9 onto the threaded portion 32 of the valve 3, the O-ring 4 is attached to the valve 3. The O-ring 4 is detachably attached so that a part thereof protrudes from the valve 3 and the washer 8.

The check valve of the present invention in this embodiment has the above-described structure, so that when fluid flows into the artificial pipe section 11, the lever 2, the valve 3, and the O-ring 4 are connected to the shaft mounting section 2 of the lever 2.
1, the O-ring 4 of the valve 3 separates from the valve seat 14, and the fluid passage inside the main body 1 opens wide, so that fluid flows through the inlet pipe 11 as shown by the arrow. It flows smoothly into the outlet pipe section 12.

On the other hand, if the fluid flows backward through the outlet pipe section 12, the lever 2,
The valve 3 and the O-ring 4 swing in the opposite direction of arrow A around the shaft 6, and the O-ring 4 of the valve 3 comes into contact with the valve seat 14, and the fluid flows from the outlet pipe section 12 to the inlet pipe section 11. Prevent backflow.

At this time, the O-ring 4 of the valve 3 comes into almost linear contact with the valve seat 14, resulting in superior airtightness compared to conventional check valves in which the flat disc-shaped valve body and the valve seat are in surface contact. Moreover, it can be closed with small back pressure.

Then, remove the cap 50 from the outlet 10 of the main body 1, remove the stopper from the shaft outlet 13 of the main body 1, pull out the shaft 6, and remove the lever 2, valve 3, O-ring 4, and splitter from the outlet 10. By removing the pin 7, washer 8 and nut 9, maintenance and inspection of each part can be carried out by connecting the main body 1 to the piping 51,
This can be done without removing it from the O-ring 52, and if the O-ring 4 is worn during this maintenance inspection, it can be replaced with a new one.

In addition, as in the above-mentioned embodiment, the main body 1 is made of bronze, and the shaft 6 is made of bronze.
If stainless steel is used, limescale will not adhere or oxidize, and it can be used with both cold and hot water.

As is clear from the above embodiments, the check valve of the present invention has a lever detachably and swingably attached to the main body, a valve detachably attached to the lever, and an O-ring detachably attached to the valve. Since it is freely attached, parts such as levers, valves, and O-rings can be removed from the main body for maintenance and inspection without removing the main body from the piping.

In addition, since an O-ring is used for the valve body, the O-ring of the valve comes into line contact with the valve seat, resulting in superior airtightness compared to conventional check valves that make surface contact. There is an effect.

Note that, as a matter of course, the check valve of the present invention is not limited to the above-mentioned embodiments.

[Brief explanation of the drawing]

The attached drawings show one embodiment of the check valve according to the present invention.
The figure is a partially cutaway perspective view, Figure 2 is an exploded perspective view, and Figure 3 is an exploded perspective view.
The figure is a longitudinal sectional view. 1...Body, 14...Valve seat, 2...Lever, 3...
... Valve, 4... O-ring, 6... Shaft, 7... Cotter pin, 8... Washer, 9... Nut.

Claims (1)

[Scope of utility model registration request] A lever is removably and swingably attached to the main body provided with an outlet, a valve is removably attached to the lever, and an O-ring is attached to the valve by a holding plate, so that the O-ring can be detached and a part of the O-ring It is attached so as to protrude from the valve and the holding plate, and a lid is removably attached to the outlet of the main body, and when the lever swings, it contacts and separates from the valve seat of the O-ring main body of the valve, and the fluid is removed. A check valve characterized in that the check valve is configured to flow in one direction.