JP2510028Y2 - Acid resistant control valve - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to improvement of an acid resistant control valve.

[0002]

2. Description of the Related Art Conventionally, a polytetrafluorocarbon having a flow passage 1a and a valve chamber 1b formed in the center thereof as an acid resistant control valve for controlling the flow rate of chlorine gas, caustic soda, sulfuric acid band, dilute sulfuric acid, hydrochloric acid, etc. A body 1 made of an acid resistant resin such as ethylene (PTFE) or polyvinyl chloride (PVC) is press-fitted into a body case 2 made of a corrosion resistant metal such as stainless steel, and the inner valve 9 made of an acid resistant resin similar to the above is provided in the valve chamber 1b. There is known an acid resistant control valve in which a bellows 10 made of an acid resistant resin is provided on the outer periphery of the inner valve, and the outer periphery of the bellows surrounds a bellows case 13 made of a corrosion resistant metal similar to the above.

In this structure, as shown in FIG. 3, the body case 2 made of corrosion-resistant metal has a box-like shape, and openings 2a are provided at both ends or both ends of the body case 2. After opening, the cubic body 1 is press-fitted into the case 2 through the opening 23 from a direction orthogonal to the opening direction of the opening 2a.

The external pipe 21 is connected to the case 2 by a stat bolt 3a which is planted on the outer periphery of the opening 2a.

[0005]

However, in the above structure, the body 1 is press-fitted into the case 2 from the direction orthogonal to the opening direction of the opening 2a, so that the opening of the flow path 1a is formed. Since the end of the body 1 is located inside the opening 2a of the case 2, it is necessary to fit a spacer 24 connecting the flow path 1a and the external pipe 21 into the opening 2a.

Further, when the spacer 24 is interposed in the opening 2a, the fluid flowing in the flow path 1a is allowed to flow through the spacer 24 and the body case 2.
Often, it leaks to the outside through the gap or the gap between the spacer 24 and the body 1.

Further, in the structure as described above, since both sides of the body case 2 are open, the fluid passing through the flow path 1a is pressurized, and the body contacting the opening 23 expands due to long-term use. It causes inconvenience such as doing.

[0008]

[Means for Solving Problems] In order to solve the above problems, in the present invention, the flow passage 1a is provided inside and the valve chamber 1b is provided at the center thereof.
The body 1 made of acid-resistant resin for forming is pressed into the body case 2 made of metal, and the valve chamber 1b is fitted with the inner valve 9 made of acid-resistant resin having the bellows 10 on its outer periphery.
In the acid resistant control valve in which the outer circumference of the bellows 10 is surrounded by a metal bellows case 13, the body case 2
An opening 2a is provided at both ends of the body 2. The body 1 is press-fitted into the body case 2 along the flow path forming direction from the opening 2a, and is formed between the opening 2a and the end of the body 1. A flange 3 in which a stud bolt 3a for connecting a pipe is planted is fitted in the groove 4, and the flange 3 is formed by a stopper ring 5 fitted in the peripheral end portion thereof and a set screw 7 provided in the opening 2a. The present invention proposes an acid resistant control valve that is fixed to the opening.

[0009]

In other words, according to the present invention, the openings 2a are provided at both ends of the body case 2, and the body 1 is press-fitted into the body case 2 along the forming direction of the flow path 1a from the openings 2a.
Since the flange 3 in which the stud bolt for pipe connection is planted is fitted and fixed in the annular groove 4 formed between 2a and the end of the body 1, the body 1 in which the opening of the flow path 1a is formed The external pipe 21 can be joined to the end of the pipe 1. Therefore, it is not necessary to interpose the spacer 24 between the end of the body 1 and the pipe 21, and fluid leakage can be reliably prevented.

Further, in this invention, since the body 1 is surrounded by the body case 2 and the flange 3, the pressure of the fluid passing through the flow passage 1a is prolonged for a long time like the acid resistant control valve shown in FIG. By adding, the inconvenience that the body 1 in contact with the opening 23 side expands does not occur.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will now be described in detail with reference to the illustrated embodiments. 1 is a cylindrical body made of PTFE, and body 1 has a flow passage 1a inside and a valve chamber 1b in the center thereof.
Moreover, an O-ring 1d is provided on the outer periphery of the opening of the flow channel 1a at the end 1c of the body 1 where the opening of the flow channel 1a is formed.

Reference numeral 2 denotes a stainless steel body case having openings 2a, 2a at both ends thereof, and the body 1 is press-fitted into the body case 2 from the opening 2a by a hydraulic device or the like along the flow path 1a forming direction.

3 is a stud bolt 3a for connecting four pipes
Is a flange in which the flange 3 is planted, and the flange 3 is the end 1c of the body 1.
And an annular groove 4 formed between the inner peripheral surface of the opening 2a of the body case 2 and the inner peripheral surface of the body case 2.

On the other hand, 5 is a stopper ring, in which fitting grooves 6 and 6 of the stopper ring 4 are formed on the peripheral end portion of the flange 3 and the inner peripheral surface of the opening 2a of the body case 2, and further the flange 3 A screw hole 8 for the set screw 7 is provided at an appropriate position.

The flange 3 is press-fitted between the inner peripheral surface of the body case 2 and the end of the body 1, and the set screw 7 is opened by screwing the set screw 7 into the screw hole 8 against the elasticity of the stopper ring 5. It is fixed to the inner peripheral surface of the portion 2a.

Reference numeral 9 denotes a PTFE inner valve mounted in the valve chamber 1b. A PTFE bellows 10 is provided on the outer periphery of the inner valve 9, a bellows cap 11 is put on the head of the bellows 10, and a lock bolt is attached. Fix it to the upper end of the inner valve 9 with 12.

The bellows 10 is housed in a bellows case 13, and a nut 15 is attached to a stat bolt 14 planted at the upper end of the body case 2 to attach the lower end of the bellows case 13 to the body case 2. Secure to the top edge.

A valve stem 17 is connected to the upper end of the inner valve 9 via a spring washer 16, an indicator 18 is provided on the valve stem 17, and the upper end of the valve stem 17 is a driving device such as a diaphragm motor or an electric motor (not shown). Connected).

A guide bush 19 and an oil seal are provided at the upper end opening of the bellows case 13 through which the valve stem 17 is inserted.
20 is filled so that the airtightness inside the bellows case 13 is maintained.

The pipes 21 and 21 have a flange 22 at the tip thereof.
Insert the stat bolt 3a into the bolt hole in the, and tighten the nut to connect to the end 1c of the body 1 where the opening of the flow path 1a is formed, and adjust the flow rate of chemicals such as chlorine gas flowing through the pipes 21 and 21. Is performed by adjusting and driving the inner valve 9 by a driving device.

[0021]

In summary, according to the present invention, openings are provided at both ends of the body case, and the body is press-fitted into the body case along the flow path forming direction from the openings and the openings are formed. The annular groove formed between the ends of the body is fitted and fixed with a flange in which a stud bolt for pipe connection is planted, so that the end of the body where the flow path opening is formed and the external pipe Can be joined without interposing a spacer, and therefore fluid leakage can be reliably prevented.

Further, in this structure, since the entire body is surrounded by the body case, there is no inconvenience that the body swells even if the pressure fluid passes for a long period of time.

[Brief description of drawings]

FIG. 1 is a vertical sectional side view showing an embodiment of the present invention.

FIG. 2 is a view showing a state in which the inner peripheral surface of the body case and the flange are joined together.

FIG. 3 is a partially cutaway perspective view showing a conventional acid resistance control valve.

[Explanation of symbols]

 1 is a PTFE body 1a is a flow path 1b is a valve chamber 1c is a body end 1d is an O-ring provided at the body end 2 is a stainless steel body case 2a is a body case opening 3 is a flange 3a Is a stud bolt for pipe connection 4 is an annular groove 5 is a stopper ring 6 is a fitting groove for a stopper ring 7 is a set screw 8 is a screw hole 9 is an inner valve made of PTFE 10 is a bellows made of PTFE 11 is a bellows cap 12 Lock bolt 13 Bellows case 14 Stat bolt 15 Nut 16 Spring washer 17 Valve stem 18 Indicator 19 Guide bush 20 Oil seal 21 External piping 22 Flange 23 Opening 24 Spacer

Claims (1)

(57) [Scope of utility model registration request] 1. An acid-resistant resin body in which an acid-resistant resin body for forming a flow passage and a valve chamber in the center thereof is press-fitted into a metal body case, and a bellows is provided on the outer periphery of the valve chamber. In the acid-resistant control valve in which the inner valve of is attached and the outer circumference of the bellows is surrounded by a metal bellows case, openings are provided at both ends of the body case, and the opening is formed along the flow path forming direction from the openings. The body is press-fitted into the body case, and a flange in which a stat bolt for pipe connection is planted is fitted in an annular groove formed between the opening and the end of the body, and the flange surrounds the circumference. An acid resistant control valve characterized in that it is fixed to the opening by a stopper ring fitted to the end and a set screw provided in the opening.