CN215471471U

CN215471471U - Plug valve disk seat processingequipment

Info

Publication number: CN215471471U
Application number: CN202120512093.1U
Authority: CN
Inventors: 李茂元; 李洋; 李乃安; 孙建建; 肖蕊; 李嘉杨; 毛健; 李建宝; 赵俊良; 许少奇; 王云飞
Original assignee: Harbin Power Plant Valve Co ltd
Current assignee: Harbin Power Plant Valve Co ltd
Priority date: 2021-03-04
Filing date: 2021-03-04
Publication date: 2022-01-11
Anticipated expiration: 2031-03-04

Abstract

The utility model belongs to the field of valve manufacturing, and particularly relates to a plug valve seat machining device which mainly comprises a clamp (1), a valve seat (2), a pressing plate (3), a screw (4) and a cylindrical pin (5). The bottom surface of the clamp (1) is a plane, the left side of the clamp is a cylindrical surface, and the clamping of numerical control milling and numerical control turning is met; the cylindrical pin (5) connects the valve seat (2) and the clamp (1) together, and limits the axial rotation of the valve seat (2); the pressing plate (3) is installed at the inner diameter of the valve seat (2), and when the screw (4) is screwed down, the pressing plate (3) moves downwards under the action of the axial force of the screw (4), so that the axial movement of the valve seat (2) is limited.

Description

Plug valve disk seat processingequipment

Technical Field

The utility model belongs to the field of valve manufacturing, and particularly relates to a valve seat machining device of a plug valve. The device can effectively solve the problem that Polymer (PEEK) thin-wall parts have large processing deformation in the actual production process.

Background

The plug valve is a rotary valve with a plug type valve plug, and the plug valve is driven to rotate by 90 degrees by an actuator. The passage port on the valve plug is communicated or separated with the passage port on the valve body, so that the valve is opened and closed. Plug valves typically have a plug shape that is either cylindrical or conical, in which the valve body passageway is generally circular in design. In a conical plug, the channels are generally trapezoidal in design. The shape of the plug valve is that the structure of the plug valve becomes light, the switch is rapid, and the fluid resistance is small. The plug valve is widely applied to petroleum exploitation, transportation and refining systems, and is also widely applied to petrochemical industry, natural gas, liquefied petroleum gas and general industrial systems.

The valve seat of the plug valve is arranged inside the valve plug, and a piston effect is generated due to the area difference. Under the action of medium force, the valve seat moves close to the valve body, and the sealing performance of the valve is guaranteed. The valve seat is made of polyether ether ketone (PEEK) which is a high polymer material with excellent performance. Has excellent mechanical performance, good self-lubricating property, chemical corrosion resistance, hydrolysis resistance, easy processing and the like. The method is widely applied to the industrial fields of aerospace, automobile manufacturing and the like.

SUMMERY OF THE UTILITY MODEL

The conventional clamping and processing method causes too large deformation of the valve seat, the dimensional tolerance and the smoothness requirement cannot be ensured, and the valve sealing test is unqualified.

The utility model aims to design a processing device of a plug valve seat, which can effectively control the processing deformation of a PEEK valve seat and meet the requirements on drawings.

The technical scheme of the utility model is as follows: the utility model provides a plug valve disk seat processingequipment, the device mainly comprises anchor clamps (1), disk seat (2), clamp plate (3), screw (4) and cylindric lock (5). The pressure plate (3) converts the pretightening force of the screw (4) into friction force to be transmitted to the valve seat (2) to limit the axial movement of the valve seat (2). The cylindrical pin (5) limits the axial rotation of the valve seat (2), thereby realizing the restraint of the valve seat (2). The inner diameter and the outer diameter of the valve seat (2) are in small clearance fit with the clamp (1) to limit the machining deformation of the valve seat (2).

Preferably, the bottom surface of the clamp (1) is a plane, the left side of the clamp is a cylindrical surface, and one clamp is suitable for clamping of numerical control milling and numerical control turning.

Preferably, the valve seat (2) is fixed on the clamp (1) through a cylindrical pin (5) to limit the axial rotation of the valve seat (2).

Preferably, the inclined surface of the pressure plate (3) and the inclined surface of the clamp (1) have a 5-degree deviation.

Preferably, the pressing plate (3) is designed with 6 grooves with the width of 1mm in the circumferential direction.

Preferably, the pressing plate (3) is made of a stainless steel material F304, and the hardness of the solution heat treatment is less than or equal to HB 130.

Preferably, the pressure plate (3) is designed with two threaded holes for easy disassembly.

Drawings

FIG. 1 is an assembly drawing of a plug valve seat machining device

In the figure, 1 is a clamp, 2 is a valve seat, 3 is a pressure plate, 4 is a screw, and 5 is a cylindrical pin

FIG. 2 is a detail view of the clamp

FIG. 3 is a detail view of a valve seat

FIG. 4 is a detail view of the platen

Detailed Description

The present invention will be described in further detail with reference to fig. 1, 2, 3, 4 and embodiments.

In the embodiment shown in fig. 1, the device mainly comprises a clamp (1), a valve seat (2), a pressure plate (3), a screw (4) and a cylindrical pin (5), and can realize numerical control milling and numerical control finish turning of the valve seat.

Install on anchor clamps after the disk seat rough machining, the inside and outside diameter and the anchor clamps of disk seat adopt less clearance fit, and the most part volume of disk seat is installed in anchor clamps, has effectively restricted the machine of disk seat and has add the deflection.

The cylindrical pin connects the valve seat and the clamp together, and axial rotation of the valve seat is limited.

The clamp plate is installed at the inner diameter of the valve seat when the screw is screwed down. The pressure plate moves downwards under the action of the axial force of the screw. Because the inclined plane of the pressure plate and the inclined plane of the clamp have an angle difference, the pressure plate generates elastic deformation to tightly fix the valve seat and limit the axial movement of the valve seat. The material of the pressing plate is stainless steel F304, and the hardness of the pressing plate is less than or equal to HB130 after solution heat treatment. The press plate is designed with 6 grooves 1mm wide in the circumferential direction, and the elastic deformation of the press plate is increased by the design (figure 4).

The bottom surface of the clamp (figure 2) is a plane, and the left side of the clamp is a cylindrical surface, so that the clamping of numerical control milling and numerical control turning is met. When numerical control milling is carried out, the bottom surface is used as a clamping surface and is directly adsorbed on the operation platform, and the saddle-shaped processing of the valve seat is completed. During fine machining, the left side serves as a clamping surface, and after three-jaw positioning, fine machining of the sealing surface of the valve seat is completed, so that the smooth finish of Ra0.4 is guaranteed.

The utility model has the beneficial effects that: the processing device for the plug valve seat is designed, the processing deformation of the high-Polymer (PEEK) valve seat can be effectively controlled, and the requirements on drawings are met. The manufacturing difficulty that the PEEK thin-wall parts are large in processing deformation is overcome, and the processing efficiency of the plug valve seat is greatly improved.

Claims

1. The machining device for the valve seat of the plug valve is characterized by comprising a clamp (1), a valve seat (2), a pressing plate (3), a screw (4) and a cylindrical pin (5), wherein a 5-degree deviation exists between the inclined plane of the pressing plate (3) and the inclined plane of the clamp (1), and the inner surface and the outer surface of the valve seat (2) are in small-gap fit with the clamp (1);

the lower end face of the pressing plate (3) is elastically deformed under the action of the pretightening force of the screw (4), the pretightening force of the screw (4) is converted into a friction force acting on the inner surface of the valve seat (2), and the axial movement of the valve seat (2) is limited.

2. The plug valve seat machining device is characterized in that the bottom surface of the clamp (1) is a plane, the left side of the clamp is a cylindrical surface, and the clamp is suitable for clamping of numerical control milling and numerical control turning.

3. A plug valve seat machining apparatus according to claim 1, wherein the valve seat (2) is fixed to the fixture (1) by a cylindrical pin (5) to restrict axial rotation of the valve seat (2).

4. The plug valve seat processing device according to claim 1, wherein the pressing plate (3) is designed with 6 grooves with the width of 1mm in the circumferential direction.

5. The machining device for the valve seat of the plug valve according to claim 1, wherein the pressing plate (3) is made of a stainless steel material F304, and the hardness of the solution heat treatment is less than or equal to HB 130.