JPH0685977U - Acid resistant control valve - Google Patents

Abstract

(57) [Summary] [Structure] An acid-resistant resin body 1 for forming a flow passage 1a and a valve chamber 1b in the center thereof is press-fitted into a metal body case 2, and the valve chamber 1b is provided with Attach the inner valve 9 made of acid-resistant resin, which has a bellows 10 on the outer circumference.
In an acid resistant control valve in which the outer periphery of 10 is surrounded by a metal bellows case 13, openings 2a are provided at both ends of the body case 2, and the body 1 is formed from the openings 2a along the flow path forming direction. It is press-fitted into the case 2 and the opening 2a
A flange 3 in which a stud bolt 3a for connecting a pipe is planted is fitted into an annular groove 4 formed between the end of the body 1 and the end of the body 1, and the flange 3 is a stopper fitted to the peripheral end of the flange. Ring 5 and set screw 7 provided in the opening 2a
Acid resistant control valve fixed to the opening by [Effect] The end of the body 1 where the opening of the flow path 1a is formed and the external pipe 21 can be joined to each other without interposing a spacer, so that leakage of fluid or the like can be reliably prevented.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to improvement of an acid resistant control valve.

[0002]

[Prior art]

 Conventionally, polytetrafluoroethylene (PTFE), in which a flow passage 1a is formed inside and a valve chamber 1b is formed in the center thereof as an acid resistance 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 acid resistant resin such as polyvinyl chloride (PVC) is press-fitted into a body case 2 made of corrosion resistant metal such as stainless steel, and an inner valve 9 made of acid resistant resin similar to the above is attached to 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 circumference of the inner valve, and the outer circumference of the bellows surrounds a bellows case 13 made of the same corrosion resistant metal as described above.

In this structure, as shown in FIG. 3, a body case 2 made of corrosion-resistant metal has a box shape, and openings 2a are provided on both or both ends of the body case 2. The portion is opened, and 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.

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

[0005]

[Problems to be solved and used by the device]

 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 end of the body 1 where the opening of the flow path 1a is formed is the opening of the case 2. It is necessary to fit a spacer 24, which is located inside the portion 2a and therefore connects the flow passage 1a and the external pipe 21, into the opening 2a.

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

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 port 23 is not attached due to long-term use. Inconvenience such as expansion occurs.

[0008]

[Means for solving problems]

 In order to solve the above problems, according to the present invention, an acid-resistant resin body 1 for forming a flow passage 1a and a valve chamber 1b in the center thereof is press-fitted into a metal body case 2 so that the valve chamber An acid-resistant resin inner valve 9 having a bellows 10 on its outer periphery is attached to 1b, and the outer periphery of the bellows 10 is surrounded by a metal bellows case 13. An opening 2a is provided at both ends, and the body 1 is press-fitted into the body case 2 along the flow path forming direction from the opening 2a and an annular groove 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 into the flange 4, and the flange 3 is formed by a stopper ring 5 fitted to the peripheral end portion of the flange 3 and a set screw 7 provided in the opening 2a. Acid resistance adjusted to be fixed in the above opening This is a proposal for saving money.

[0009]

[Action]

 That is, in this invention, 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 and the ends of the openings 2a and the body 1 are pressed. Since the flange 3 in which the stud bolt for pipe connection is planted is fitted and fixed to the annular groove 4 formed between the parts, an external portion is provided at the end of the body 1 where the opening of the flow path 1a is formed. The pipes 21 can be joined together, so that there is no need to interpose a spacer 24 between the end of the body 1 and the pipes 21, and fluid leakage can be reliably prevented.

Further, in the present 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. The addition does not cause the inconvenience that the body 1 in contact with the opening 23 side expands.

[0011]

【Example】

 Hereinafter, the present invention will be described in detail with reference to the illustrated embodiment. 1 is a cylindrical body made of PTFE, and body 1 has a flow passage 1a inside and a valve chamber 1b formed in the center thereof, and At the end 1c of the body 1 where the opening of 1a is formed, an O-ring 1d is provided on the outer periphery of the opening of the channel 1a.

Reference numeral 2 denotes a body case made of stainless steel 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 passage 1a forming direction.

Reference numeral 3 denotes a flange in which four stud bolts 3a for connecting pipes are planted, and the flange 3 is formed between the end 1c of the body 1 and the inner peripheral surface of the opening 2a of the body case 2. It is fitted into the annular groove 4.

On the other hand, 5 is a stopper ring, in which fitting grooves 6, 6 of the stopper ring 4 are engraved on the peripheral end portion of the flange 3 and the inner peripheral surface of the opening 2 a 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 screwed into the screw hole 8 against the elasticity of the stopper ring 5. It is fixed to the inner peripheral surface of the opening 2a.

Reference numeral 9 denotes a PTFE inner valve that is mounted in the valve chamber 1b. A PTFE bellows 10 is provided on the outer periphery of the inner valve 9, and a bellows cap 11 is put on the head of the bellows 10 to attach a lock bolt. 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 an upper end portion of the inner valve 9 via a spring washer 16, an indicator 18 is provided on the valve stem 17, and an upper end thereof is a driving device such as a diaphragm motor or an electric motor (not shown). Connected).

The upper end opening of the bellows case 13 into which the valve stem 17 is inserted is filled with a guide bush 19 and an oil seal 20 to keep the bellows case 13 airtight.

In addition, the pipes 21 and 21 are connected to the end 1c of the body 1 where the opening of the flow path 1a is formed by inserting the stat bolt 3a into the bolt hole in the flange 22 at the tip thereof and tightening the nut. The flow rate of a chemical such as chlorine gas flowing through the pipes 21, 21 is adjusted by driving the inner valve 9 by a driving device.

[0021]

[Effect of device]

 In short, according to the present invention, openings are provided at both ends of the body case, the body is press-fitted into the body case from the openings along the flow path formation direction, and the openings and the ends of the body are formed. A flange with a stud bolt for pipe connection is fitted and fixed in the annular groove formed between the ends of the body where the flow path opening is formed and the external pipe with a spacer. They can be joined without intervening, and thus the leakage of fluid 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 coupled with each other.

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 is bellows case 14 is stat bolt 15 is nut 16 is spring washer 17 is valve stem 18 is indicator 19 is guide bush 20 is oil seal 21 External piping 22 is flange 23 is open port 24 is spacer

Claims (1)

[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 extends from the opening along the flow path forming direction. 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.