JP3954170B2 - Spring-loaded check valve - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a spring-biased check valve which is attached to a fluid pipe and allows a forward flow from the inlet to the outlet of the fluid by a spring-biased valve body provided inside, but closes the reverse flow. More particularly, the present invention relates to a spring-biased check valve that allows an inlet fluid to pass to an outlet during a pause when fluid transportation is stopped.
[0002]
[Prior art]
An example of a spring-biased check valve is shown in Japanese Utility Model Laid-Open No. 60-10964. This is because an annular valve seat is provided in a valve casing having an inlet and an outlet, a disc-shaped valve body is disposed on the outlet side of the annular valve seat, and the disc-shaped valve body is closed on the outlet side of the disc-shaped valve body. A coil spring urging in the valve direction is arranged, a rib is provided on the outer periphery of the disc-shaped valve body, and the outer end of the rib is brought into sliding contact with the inner peripheral wall of the valve casing.
[0003]
[Problems to be solved by the invention]
In the conventional spring-biased check valve, when the fluid transportation is stopped and the fluid pressure at the inlet decreases until it becomes substantially equal to the fluid pressure at the outlet, the spring-biased valve body is moved to the annular valve seat. In order to sit and close the valve, a fluid reservoir is formed on the inlet side.
[0004]
This fluid reservoir becomes a culture site for bacteria, and the bacteria propagate during the rest, and there is a problem that it may cause a serious accident especially when used in the food and medical fields.
[0005]
Accordingly, it is an object of the present invention to provide a spring-biased check valve that allows an inlet fluid to pass to an outlet during a pause when fluid transport is stopped.
[0006]
[Means for Solving the Problems]
The means of the present invention devised to solve the above-mentioned problem is that an inlet and an outlet are formed by valve casing, an annular valve seat is provided between the inlet and the outlet, and a valve body is provided on the outlet side of the annular valve seat. By placing and providing a spring that urges the valve body to the annular valve seat, it allows passage of fluid in the forward direction but closes fluid in the reverse direction, so that the inlet is formed above and the outlet is formed below the inlet. The valve body is arranged below the annular valve seat, and the spring is formed into a spring force that displaces the valve body to a position slightly separated from the annular valve seat when the fluid pressures at the inlet and the outlet are equal. When the fluid pressures are equal, the valve body is displaced to a position slightly separated from the annular valve seat .
[0007]
DETAILED DESCRIPTION OF THE INVENTION
When the inlet and outlet fluid pressures are equal, the valve body is displaced to a position slightly separated from the annular valve seat by the spring, so that the inlet fluid can pass to the outlet.
[0008]
When the inlet fluid pressure becomes higher than the outlet fluid pressure, the valve body moves further away from the annular valve seat against the spring by the inlet fluid pressure, thereby allowing more fluid to pass to the outlet.
[0009]
When the outlet fluid pressure becomes higher than the inlet fluid pressure, the valve body is seated on the annular valve seat by the outlet fluid pressure and the spring, thereby preventing the fluid from flowing back to the inlet.
[0010]
【Example】
An embodiment showing a specific example of the present invention will be described (see FIGS. 1 and 2).
A valve casing is formed by an inlet member 2 provided with the inlet 1, an outlet member 4 provided with the outlet 3, and a gasket 5 interposed between the two members. The valve casing is fastened by tightening clamps 8 and 9 having hinges 6 and 7 with screws 10. The inlet member 2 and the outlet member 4 are made of a corrosion resistant material such as stainless steel, and the gasket 5 is made of synthetic rubber or synthetic resin according to the type of fluid.
[0011]
An annular valve seat 11 is formed at the inner end of the inlet member 2, and a flat valve body 12, a coil spring 13 as an urging means, and a spring receiver 14 are arranged on the outlet 3 side of the annular valve seat 11. The valve body 12, the coil spring 13, and the spring receiver 14 are formed of a corrosion-resistant material such as stainless steel like the entrance / exit members 2 and 4.
[0012]
The valve body 12 has a plurality of ribs 15 having a diameter slightly smaller than the inner diameter of the outlet member 4 on the outer periphery so that the valve body 12 can slide up and down. The coil spring 13 that biases the valve body 12 toward the annular valve seat 11 has a spring force that displaces the valve body 12 to a position slightly separated from the annular valve seat 11 when the fluid pressures at the inlet 1 and the outlet 3 are equal. Form.
[0013]
When the fluid pressures at the inlet 1 and the outlet 3 are equal, the valve body 12 is displaced to a position slightly separated from the annular valve seat 11 by the coil spring 13, so that the fluid at the inlet 1 can be passed to the outlet 3. .
[0014]
When the fluid pressure at the inlet 1 becomes higher than the fluid pressure at the outlet 3, the valve body 12 further moves away from the annular valve seat 11 against the spring force of the coil spring 13 by the fluid pressure at the inlet 1. A lot of fluid is passed to the outlet 3.
[0015]
When the fluid pressure at the outlet 3 becomes higher than the fluid pressure at the inlet 1, the valve body 12 is seated on the annular valve seat 11 by the fluid pressure at the outlet 3 and the spring force of the coil spring 13, so that the fluid flows backward to the inlet 1. To prevent.
[0016]
In the present embodiment, a disc type check valve using a flat plate as the valve body 12 is exemplified, but a valve body having other shapes such as a sphere or the like, a reverse type such as a swing type or a wafer type is used. It can also be applied to a stop valve.
[0017]
【The invention's effect】
As described above, in the spring-biased check valve according to the present invention, the valve body is displaced to a position slightly separated from the annular valve seat by the spring when the inlet and outlet fluid pressures are equal. It can be passed to the exit. Therefore, bacterial growth can be prevented and it can be used in the food and medical fields.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing an embodiment of a spring biased check valve of the present invention.
FIG. 2 is a plan view of the clamp of FIG.
[Explanation of symbols]
1 Inlet 2 Inlet member 3 Outlet 4 Outlet member 5 Gasket 8, 9 Clamp 10 Screw 11 Annular valve seat 12 Valve element 13 Coil spring 15 Rib

Claims (1)

The valve casing forms an inlet and an outlet, an annular valve seat is provided between the inlet and the outlet, a valve body is disposed on the outlet side of the annular valve seat, and a spring that biases the valve body toward the annular valve seat is provided. Thus, in the case where the fluid in the forward direction is allowed to pass but the fluid in the reverse direction is closed, the inlet is formed above and the outlet is formed below the inlet, the valve body is disposed below the annular valve seat, and the spring is When the inlet and outlet fluid pressures are equal, a spring force is formed to displace the valve body to a position slightly separated from the annular valve seat.When the inlet and outlet fluid pressures are equal, the valve body is slightly separated from the annular valve seat. A spring-biased check valve that is displaced to a seated position .

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