JPS6110174A - Valve for preventing entering of foreign matter - Google Patents

Abstract

PURPOSE:To reliably prevent granular foreign matter from being caught between a valve seat and a valve body by continuously disposing a conical member for preventing entering of foreign matter to be integral with the small-diameter end portion of a valve body. CONSTITUTION:A valve rod 4 is integral with the large-diameter end portion in a conical valve body 6 confronting with a circular valve seat 5 disposed in the boundary between a valve chest 2 and an inflow hole 3. The small-diameter end portion of the valve body 6 is integral with the large-diameter end portion in a conical member for preventing entering of foreign matter having the large-diameter end portion 7 having a diameter D3 which is larger than a diameter D1 of the small-diameter end portion and a little smaller than a diameter D2 of the inflow hole 3. When the large-diameter end portion of the member 8 for preventing entering of foreign matter is put in the inflow hole 3, a small space is formed therebetween, and the small space functions as a filter gap.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a foreign object prevention valve that can prevent foreign objects in piping from becoming trapped between a valve seat and a valve body.

[Prior art]

Conventionally, for opening/closing valves interposed in gas or fluid piping, a valve chamber is provided with a valve chamber and an inlet hole with a circular cross section communicating with the valve chamber, and a valve stem screwed into the valve body is provided with a valve chamber and an inlet hole. A horizontal system is known in which the large-diameter end of a conical valve body facing a circular valve seat between the valve body and the valve body are integrally connected.

On the other hand, during piping work, iron shavings generated when threading the pipe end, cutting swarf from the 7-Luteso wound around the threaded connection, sand, and other foreign matter may enter the pipe. .

When the valve is closed, if the foreign matter gets caught between the valve seat and the valve body, there is a problem in that the valve leaks.

[Purpose and structure of the invention]

It is an object of the present invention to provide a foreign matter jamming prevention valve that can advantageously solve the above-mentioned problem. An inflow hole 6 with a circular cross section is provided, and a large conical valve body 6 facing the circular valve seat 5 between the valve chamber 2 and the inflow hole 6 is provided on the valve stem 4 screwed into the valve body 1. In a valve having continuous diameter ends, the small diameter end of the valve body 6 is provided with a diameter D3 larger than the diameter DI of the small diameter end and slightly larger than the diameter D2 of the inflow hole B. This foreign matter trapping prevention valve is characterized in that a large diameter end of a conical foreign matter inflow prevention member 8 having a diameter end 7 is integrally connected.

〔Example〕

Next, this invention will be explained in detail by way of an example shown in the drawings.
, a valve chamber 2 having a circular cross section, an inlet hole 3 having a circular cross section communicating with the central portion thereof, and an inlet passage 9 communicating with the inlet hole 6;
An outflow passage 10 communicating with a side part of the valve chamber 2 is provided,
A valve stem 4 with a fixed handle 11 is screwed into the valve box 1, and the valve stem 4 has a large conical valve body 6 facing a circular valve seat 5 at the boundary between the valve chamber 2 and the inflow hole 6. The diameter ends are integrally connected, and a large diameter end with a diameter D3 that is larger than the diameter D1 of the small diameter end and slightly larger than the diameter D2 of the inflow hole B is attached to the small diameter end of the valve body 6. The large diameter end portion of the conical foreign matter inflow prevention member 8 having the portion 7 is integrally connected.

When the large-diameter end of the foreign matter inflow prevention member 8 is disposed within the inflow hole 6, a small gap, for example, a gap of 0.1N, is provided between them, and this small gap becomes a filter gap.

Note that 12 and 16 are pipes that are threadedly connected to the valve box 1.

〔Effect of the invention〕

According to this invention, when the valve body 6 is moved in the closing direction, the large diameter end of the foreign matter inflow prevention member 8 is first inserted into the inflow hole 3 before the valve is closed, so that the foreign matter inflow is prevented. The large diameter end 7 of the member 8 prevents particulate foreign matter from entering from the inlet hole 3 into the valve seat 5 and the valve chamber 2, and when particulate foreign matter is present in the valve chamber 2 near the valve seat 5. The particulate foreign matter is blown away from the vicinity of the valve seat 5 by the high-speed fluid passing between the inflow hole 5 and the large-diameter end 7, and then the valve body 6 is pressed against the valve seat 5. It is possible to reliably prevent particulate foreign matter from being caught between the valve body 6 and the valve body 6, and therefore ensure that gas or liquid leaks from between the valve seat 5 and the valve body 6 in the closed state. The structure is simple, as it is only necessary to connect the conical foreign matter inflow prevention member 8 to the small-diameter end of the conical valve body 6 in a valve with a conventionally known structure. At the same time, effects such as the ability to manufacture a foreign object prevention valve at low cost can be obtained.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, in which FIG. 1 is a longitudinal side view showing the foreign matter intrusion prevention valve in an open state, and FIG. 2 shows a state in which the foreign matter intrusion prevention member is inserted into the inflow hole. FIG. 3 is an enlarged longitudinal side view showing the foreign matter trapping prevention valve in a closed state, and FIG. 4 is an enlarged longitudinal side view of a portion thereof. In the figure, 1 valve box, 2 valve chamber, 3 inflow hole, 4VI
5 is a circular valve seat, 6 is a valve body, 7 is a large diameter end, aVi
The foreign matter inflow prevention part 11 is a handle.

Claims (1)

[Claims] A valve body 1 is provided with a valve chamber 2 and an inlet hole 3 having a circular cross section communicating with the valve chamber 2. A valve stem 4 screwed into the valve body 1 is provided with a circular valve seat between the valve chamber 2 and the inlet hole 3. In a valve in which a large diameter end of a conical valve body 6 facing the valve body 5 is connected to the small diameter end of the conical valve body 6, the small diameter end of the valve body 6 has a diameter larger than the diameter D_1 of the small diameter end and of the inflow hole 3. A foreign matter entrapment prevention valve characterized in that the large diameter end of a conical foreign matter inflow prevention member 8 having a large diameter end 7 having a diameter D_3 slightly smaller than the diameter D_2 is integrally connected.