JPH05172256A - Fluid control apparatus - Google Patents

Abstract

PURPOSE:To facilitate replacement of seat ring by holding seat ring so that it is pinched by the flat seat face of a body and the disc under-surface to be installed in a single piece with a bonnet, which is secured to the body with possibility of removal. CONSTITUTION:When a handle is turned and a stem 7 is lifted through an engagement part with female threads of a bonnet 4, a disc 6 rises and moves apart from an upper ring-shaped projection 16 on a seat ring 5, so that a fluid controller is put in the open state. If in this open state the handle is turned reversely, the full closed state is generated through opposite motions. Because therein is placed on the flat seat face 3 and pinched fast by a spring 8, the seat ring 5 makes fine movement in accordance with its seating condition on the disc 6, and the optimum seating condition is obtained. When the seat ring 5 is worn and to be replaced, a fastening ring 15 is removed, and bonnet 4 is dismantled from the body 2 together with the disc 6, etc., as in a single piece.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fluid controller used in a fluid line of, for example, a semiconductor manufacturing apparatus or a nuclear power plant, and more particularly to improvement of a seat ring replaceable.

[0002]

2. Description of the Related Art Conventionally, as fluid control devices of this type, for example, JP-B-44-12462 and JP-B-45-1749.
No. 8 and the one described in Jitsuko Sho 59-30278 are known. This is basically a body having an inflow passage, an outflow passage and a recessed chamber formed in the middle of these, an annular recess formed at the boundary between the inflow passage of the body and the recessed chamber, and a body. A bonnet for closing the recessed chamber, a seat ring removably fitted in the annular recess, a disc that can be seated on the seat ring, a stem linked to the disc and penetrating the bonnet, a bonnet and a seat And a support member that is provided between the seat ring and the ring to maintain the fitting between the seat ring and the annular recess. However, in such a thing, since the seat ring was fitted in the annular recess provided in the body, the seat ring would come into close contact with the annular recess after a long time, and this should be easily replaced. I couldn't.

[0003]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems and was devised to solve the problem. The purpose of the present invention is to easily replace the seat ring even after aging. It is to provide a fluid controller that can be done.

[0004]

The fluid controller of the present invention comprises:
Basically, the body is provided with an inflow passage, an outflow passage, and a concave chamber formed in the middle of these, a flat seating surface formed at the boundary between the inflow passage of the body and the concave chamber, and the body. Provided between the bonnet and the seat ring, a bonnet that closes the concave chamber, a seat ring that is placed on a flat seat surface, a disc that can be seated on the seat ring, a stem that is connected to the disc and penetrates the bonnet, and a bonnet and the seat ring. It is characterized by being composed of a spring that presses the seat ring against the flat seat surface.

[0005]

When the seat ring is fully closed, the seat ring is engaged with the flat seating surface and is elastically pressed by the elastic force of the spring, so that the disc is seated against the seat ring. When the stem is lifted from such a state, the disc is separated from the seat ring to be in the open state, and the fluid flows through the inflow passage → the concave chamber → the outflow passage. When replacing the seat ring, remove the bonnet from the body, remove the spring and seat ring, and then install a new seat ring in the reverse order of the above. The seat ring is placed on a flat seating surface and is held by the springs in a pressed state, so that it can be easily removed even after years have passed.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a longitudinal sectional view showing a fluid controller according to a first embodiment of the present invention. The fluid controller 1 is mainly composed of a body 2, a flat seat surface 3, a bonnet 4, a seat ring 5, a disc 6, a stem 7, and a spring 8. The body 2 is provided with an inflow passage 10, an outflow passage 11 and a recessed chamber 12 formed in the middle thereof. In this example, the left side has an inlet, the right side has an outlet, and the upper side has an upper side. The recessed chamber 12 is opened, the inflow passage 10 is formed between the inlet and the middle of the bottom of the recessed chamber 12, and the outflow passage 11 is formed between the right side of the bottom of the recessed chamber 12 and the outlet. Flat seat surface 3
Is formed at the boundary between the inflow passage 10 of the body 2 and the recessed chamber 12, and in this example, is formed on the bottom surface of the recessed chamber 12, and a high hardness material 13 such as stellite is deposited in the middle thereof. I am doing it. That is, a recess is formed in the middle of the bottom surface of the recessed chamber 12, the high hardness material 13 is welded and filled, and then cut to be flush. The bonnet 4 is provided in the body 2 and is provided in the recessed chamber 1.
In this example, it is fitted over the body 2 via an O-ring 14, and is attached by tightening a taper flange formed on these with a tightening ring 15. The seat ring 5 is placed on the flat seat surface 3, and in this example, is provided with upper and lower semi-annular annular projections 16 having a substantially flat annular shape and is made of engineering plastic, nickel, stainless steel, or the like. Lower annular protrusion 1
6 is fitted to the high hardness material 13 of the flat seat surface 3. The disk 6 can be seated on the seat ring 5. In this example, the disk 6 has a substantially columnar shape and is made of a material harder than the seat ring 5, and the lower surface is fitted to the upper annular projection 16 of the seat ring 5. The stem 7 is connected to the disc 6 and penetrates the bonnet 4. In this example, the stem 7 has a rod shape and is screwed to the bonnet 4, the disc 6 is non-rotatably coupled to the lower portion, and the handle is provided on the upper portion. A packing 17 (not shown) is attached, and a packing 17 is provided between the bonnet 4 and the upper portion thereof. The packing 17 is tightened by a cap nut 19 screwed onto the upper portion of the bonnet 4 via a pressing ring 18. The spring 8 is provided between the bonnet 4 and the seat ring 5 and elastically presses the seat ring 5 against the flat seat surface 3. In this example, the spring 8 has a coil shape and has annular upper and lower spring holders 20 on both sides. Is provided so as not to interfere with the disk 6 and the stem 7. The upper spring holder 20 is screwed inside the lower portion of the bonnet 4 so as to be vertically movable. Lower spring holder 2
No. 0 has an annular recess formed on the outside of the upper portion of the seat ring 5. Next, the operation will be described based on such a configuration. FIG. 1 shows a fully closed state. At this time, the lower annular protrusion 16 of the seat ring 5 is abutted against the high hardness material 13 of the flat seat surface 3 and is elastically pressed by the elastic force of the spring 8, and the lower surface of the disk 6 abuts against the upper annular protrusion 16 of the seat ring 5. Has been done. From this state, when the handle 7 is rotated and the stem 7 is screwed up, the disc 6 rises and is separated from the upper annular protrusion 16 of the seat ring 5. Then, it will be in the open state, and the fluid from the inlet will flow into the inflow passage 1
0 → recessed chamber 12 → outflow passage 11 → flow to the outlet. On the contrary, when the handle is rotated in the reverse direction from the open state, the operation opposite to the above is performed and the fully closed state shown in FIG. 1 is reached. At this time, since the seat ring 5 is placed on the flat seating surface 3 and held by the spring 8 in a sandwiched state, the seat ring 5 slightly moves depending on the seating condition with the disc 6, and the optimum seating condition is obtained. The seat ring 5 includes the high hardness material 13 on the flat seat surface 3 and the disc 6
In addition to having a hardness lower than that of the above material, the annular projection 16 is provided to increase the surface pressure, so that the material wears earlier than these materials. When replacing the seat ring 5, the fastening ring 15 is removed and the bonnet 4 is removed from the body 2. Then, the stem 7, the disk 6, the upper spring holder 20 and the like are removed together. Then, the spring 8, the lower spring holder 20, and the seat ring 5 are removed. Then, the new seat ring 5 is attached in the reverse order of the above. Seat ring 5
Since it is placed on the flat seat surface 3 and held by the spring 8 in a sandwiched state, it can be easily removed even after aging. Therefore, the replacement can be easily performed.

Next, a second embodiment of the present invention will be described with reference to FIG. The second embodiment has a lower spring holder 20.
Is different from that of the first embodiment in that it has a substantially Ω shape in a plane and can be expanded / contracted. With this configuration, the seat ring 5 can be easily attached and detached.

Next, a third embodiment of the present invention will be described with reference to FIG. The third embodiment differs from the first embodiment in that a filter 21 is provided to close the central hole of the seat ring 5. By doing so, fine dust in the fluid can be removed.

Next, a fourth embodiment of the present invention will be described with reference to FIG. The fourth embodiment is different from the first embodiment in that the diameter of the annular projection 16 of the seat ring 5 is increased to be different. In this way, the seat ring 5 can be replaced with a new one every time the seat ring 5 is replaced, and can be used immediately without modifying the original seat.

Although the flat bearing surface 3 is formed by depositing the high hardness material 13 in the above embodiment, the flat bearing surface 3 is not limited to this and may be omitted, for example. Although the seat ring 5 is provided with the upper and lower annular projections 16 in the previous embodiment, the present invention is not limited to this, and one or both of them may be omitted. Spring 8
In the above embodiment, the upper and lower spring holders 20 are provided, but the present invention is not limited to this, and one or both of them may be omitted.

[0011]

As described above, according to the present invention,
The following excellent effects can be achieved. (1) It is composed of a body, a flat seat surface, a bonnet, a seat ring, a disc, a stem, and a spring. Above all, the seat ring is placed on the flat seat surface provided on the body so that the spring holds the sandwiching pressure. As a result, the seat ring can be easily replaced even with age. (2) Since the seat ring is placed on the flat seating surface provided on the body and the spring is used to hold the seat ring, the seat ring slightly moves according to the seat ring and the disk seating condition, and the optimum seating condition is achieved. Can be obtained. (3) Since the body is provided with a flat bearing surface instead of an annular recess, it is easy to process and the accuracy can be improved. (4) When a filter is provided on the seat ring, fine dust in the fluid can be removed. (5) When the annular projection provided on the seat ring has a different diameter, the flat seating surface and the mating position for the disc can be changed each time the seat ring is replaced, without modifying the original mating position. Ready to use.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view showing a fluid controller according to a first embodiment of the present invention.

FIG. 2 is a plan view showing a lower spring holder according to a second embodiment of the present invention.

FIG. 3 is a plan view showing a seat ring according to a third embodiment of the present invention.

FIG. 4 is a vertical sectional view showing a seat ring according to a fourth embodiment of the present invention.

[Explanation of symbols]

 1 Fluid Controller 2 Body 3 Flat Seat Surface 4 Bonnet 5 Seat Ring 6 Disc 7 Stem 8 Spring

Claims (1)

[Claims] 1. A body provided with an inflow passage, an outflow passage, and a recessed chamber formed in the middle thereof, a flat seating surface formed at a boundary between the inflow passage of the body and the recessed chamber, and the body. Provided between the bonnet and the seat ring, a bonnet that closes the concave chamber, a seat ring that is placed on a flat seat surface, a disc that can be seated on the seat ring, a stem that is connected to the disc and penetrates the bonnet, and a bonnet and the seat ring. A fluid controller comprising a spring for elastically pressing the seat ring against a flat seat surface.