JPH0319652Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial application field The present invention is a check valve and foot used in water pumps, in which a rubber sheet gasket is attached to the valve body, and the rubber sheet gasket is seated on the valve seat. Concerning valves such as valves.

PRIOR ART Valves of the above type, namely check valves and foot valves, are well known. In this type of valve, as shown in FIG. 2, the rubber sheet gasket 43 is held between the valve body 41 by a presser metal fitting 42, and the presser metal fitting 42 is bolted to the valve body 41, so that the rubber sheet gasket 43 can be attached to the valve body. It is attached to 41. This rubber sheet packing 43 is used to cushion the impact when the valve body 41 is seated on the valve seat 44 and to ensure that the valve seat 44 and the valve body 41 are in close contact. A relatively soft rubber hardness is advantageous.

As an example of the use of a check valve or a foot valve having such a configuration, as shown in FIG. is placed in parallel with the through valve. And pump 5
3, it absorbs water through the foot valve and pumps it to an upper tank (not shown) via the check valve and through valve.

Problems the invention aims to solve However, if the pump stops due to a power outage or other reason during pumping, the water will flow backwards. At this time, the check valve 52 is about to close, and at that moment water pressure is applied to the rubber sheet gasket 43 as indicated by the arrow in FIG. 4a. As a result, there is a risk that the rubber sheet gasket 43 may roll up as shown in FIG. 4b, and if the rubber sheet gasket 43 were to roll up, there was a problem in that all the water would flow backwards.

In addition, in the case of the foot valve 51, the valve body 4 can be manually operated.
A water draining lever 54 is provided (FIG. 3) that opens the water drain lever 54, and when water is used to prevent freezing, pump cleaning, etc., the lever is operated to drain water from the pump piping. At this time, water pressure is applied to the rubber sheet gasket, and as shown in FIG. 5a, the rubber sheet gasket 43 stretches and may not separate from the valve seat 44, preventing the valve from opening. Even if it barely opens, the 5th
As shown in Figure b, the rubber sheet packing 43 is rolled up. For this reason, there was a problem that not only the rubber sheet gasket 43 was damaged, but also that the upper tank could not be controlled to return to a predetermined water level.

The object of the present invention is to provide a valve that eliminates the above-mentioned problems.

Means for Solving the Problems The structure of the present invention that achieves the above object is as follows.

In a valve used in a water pump, in which a rubber sheet gasket is attached to a valve body, and a portion of the rubber sheet gasket is seated on a valve seat, the valve is formed at the lower part of the valve body, and the upper side of the rubber sheet gasket is fitted. A valve comprising a valve body recess to be fitted, a recess formed in the lower part of the rubber sheet gasket, and a presser that abuts almost the entire surface of the recess and attaches the rubber sheet gasket to the valve body.

Effects According to the above configuration, since the valve body concave portion and the concave portion are provided, the contact surfaces between the valve body, the rubber sheet packing, and the presser are U-shaped, and the contact area is also large. It is possible to prevent the rubber sheet gasket from separating from the valve body and curling up due to backflow.

Embodiment Hereinafter, the present invention will be explained in detail based on an embodiment of a foot valve.

In FIG. 1, reference numeral 1 denotes a foot valve, and the foot valve 1 includes a valve box 2, a strainer 3,
It has a valve body 4, a valve seat 5, and a drain lever 6. A rubber sheet gasket 7 is attached to the valve body 4, and is arranged so that the rubber sheet gasket 7 hits the valve seat 5 when the valve is closed.
This rubber sheet gasket 7 is made of relatively soft rubber in order to improve impact mitigation and sealing performance, and has conventionally been attached simply with a presser.
As previously explained, this causes problems such as the rubber sheet packing 7 curling up when draining water. Therefore, the present invention takes the following measures.

In FIG. 1, a valve body recess 4a having a diameter approximately equal to or slightly larger than the diameter of the valve seat 5 is formed on the lower surface of the valve body 4, and the shape of the valve body recess 4a matches the shape of the upper surface of the rubber sheet packing. There is. A rubber sheet gasket 7 made of relatively soft rubber is fitted into the valve body recess 4a, and a recess 7a is also formed on the lower surface of the rubber sheet gasket 7. The rubber sheet packing 7 has a thick portion 7b around which there is no concave portion 7a.
This thick portion 7b is seated on the valve seat 5.

Into the recessed portion 7a of the rubber sheet packing 7 is fitted a presser tool configured as a contact plate 8 made of a rigid metal and having a falling portion 8a formed on its peripheral surface. The rubber sheet gasket 7 is held between the abutment plate 8 and the valve body 4, and the valve body Fixed. In this case, the upper surface and outer circumferential surface of the contact plate 8 are in contact with the recess 7a of the rubber sheet packing 7 over almost the entire area. In addition,
It is advantageous that the contact plate 8 makes as much contact with the rubber sheet packing 7 as possible.

In the foot valve 1 thus constructed, when the drain lever 6 is rotated as shown by the dotted line in FIG. 1, the valve body 4 is lifted by the drain lever 6, and the water in the pipe flows backwards and escapes. At this time, water pressure is applied to the rubber sheet packing 7 as shown by the arrow in FIG. This prevents it from deforming and curling up. That is, since the falling part 8a of the contact plate 8 is provided, it is pressed against the rubber sheet gasket 7 in a substantially U-shape, and the space between the valve body 4 and the rubber sheet gasket 7 is also substantially U-shaped. Together with contact,
It is possible to reliably prevent the rubber sheet packing 7 from curling up.

In the above embodiment, a foot valve was explained, but the present invention can of course be applied to a check valve.

Effects The valve according to the present invention is configured as described above, and even if water pressure due to backflow of water is applied to the rubber sheet gasket, it is possible to reliably prevent the rubber sheet gasket from curling up.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an embodiment of the present invention, FIG. 2 is a sectional view showing a valve body portion of a conventional valve, and FIG. 3 is an explanatory view showing an example of how a foot valve and check valve are used. FIGS. 4a and 4b are diagrams illustrating the occurrence of bulge in a conventional check valve, and FIGS. 5a and 5b are diagrams illustrating the occurrence of bulge in a conventional foot valve. 1... Foot valve, 4... Valve body, 4a... Valve body recess, 5... Valve seat, 7... Rubber sheet packing, 7
a... Concavity.

Claims (1)

[Scope of utility model registration request] In a valve used in a water pump, in which a rubber sheet gasket is attached to a valve body, and a portion of the rubber sheet gasket is seated on a valve seat, the valve is formed at the lower part of the valve body, and the upper side of the rubber sheet gasket is fitted. A valve comprising a valve body recess to be fitted, a recess formed in the lower part of the rubber sheet gasket, and a presser that abuts almost the entire surface of the recess and attaches the rubber sheet gasket to the valve body.