WO2020038008A1

WO2020038008A1 - High-performance nano-coated corrugated-tube special chlorine gas valve

Info

Publication number: WO2020038008A1
Application number: PCT/CN2019/083790
Authority: WO
Inventors: 毛金根; 毛春龙; 陈善俊
Original assignee: 江苏金晟元特种阀门股份有限公司
Priority date: 2018-08-21
Filing date: 2019-04-23
Publication date: 2020-02-27
Also published as: CN108775406A

Abstract

A high-performance nano-coated corrugated-tube special chlorine gas valve, relating to the technical field of corrugated-tube special chlorine gas valve designs. The valve comprises a valve body (1), a valve seat (2), a valve disc (3), a corrugated tube assembly (4), a valve cover (5), a valve stem (6), a packing gland (7), a transmission rod (8), a guide block (9), a transmission nut (10), and a handwheel (11). The valve seat (2), the valve disc (3), and the valve stem (6) are provided in the valve body (1), and the valve disc (3) is arranged at an end of the valve stem (6). The valve cover (5) is provided above the valve body (1). An upper end of the valve rod (6) is connected to the transmission rod (8) in a floating manner by means of the guide block (9), and the transmission rod (8) is connected to the handwheel (11) by means of the transmission nut (10). The corrugated tube assembly (4) is provided between the valve cover (5) and the valve stem (6). The corrugated tube assembly (4) comprises a corrugated tube (4-1). A stuffing box (12) is provided above the corrugated tube (4-1), and an upper end of the stuffing box (12) is welded to the valve cover (5). A positioning bushing (13) is provided below the corrugated tube (4-1), and the positioning bushing (13) is welded to the valve stem (6). Sealing packing (14) is provided in the stuffing box (12). The packing gland (7) is provided above the sealing packing (14), and is connected to the valve cover (5) by a bolt. The device has a good sealing effect, does not leak easily, has a long service life, and is safe and reliable.

Description

High performance nano-coated bellows chlorine gas special valve

Technical field

The invention relates to the technical field of design of a bellows chlorine gas special valve.

Background technique

At present, the valves used in the chemical industry in China's chemical industry to control the flow of chlorine gas and liquid chlorine pipeline media are ordinary ordinary chlorine gas valves. Due to the lack of special features in material selection and valve structure, on the one hand, the performance of this valve is unstable. The sealing effect is not good; on the other hand, under the corrosive, poisonous and harmful process conditions, the corrosion resistance is poor, easy to leak, the casing is easy to perforate, and the bellows is easy to wear, resulting in a short overall service life of the valve, which cannot meet the long-term effective transport of the medium. Special requirements, and once the toxic medium leaks, it will bring great harm to the surrounding environment and personal safety.

Summary of the Invention

The purpose of the present invention is to solve the above problems and provide a high-performance nano-coated bellows chlorine gas special valve with good sealing effect, not easy to leak, and long service life.

The invention includes a valve body, a valve seat, a valve disc, a bellows assembly, a valve cover, a valve stem, a stuffing gland, a transmission rod, a guide block, a transmission nut, and a hand wheel; the valve seat, the valve disc, and the valve stem are respectively provided. In the valve body, the valve disc is disposed at the end of the valve stem; the valve cover is disposed above the valve body; the upper end of the valve stem is floatingly connected to the transmission rod through a guide block, and the transmission rod is connected to the hand wheel through a transmission nut The bellows assembly is provided between the valve cover and the valve stem; the bellows assembly includes a bellows; a stuffing box is arranged above the bellows; the upper end of the stuffing box is welded to the valve cover; A positioning sleeve is arranged below, and the positioning sleeve is welded to the valve stem; a sealing packing is arranged in the stuffing box; the packing gland is arranged above the sealing packing and is connected with the valve cover by bolts.

The sealing packing of the present invention uses polytetrafluoroethylene packing as the safety seal of the valve stem, effectively preventing the bellows from being damaged, controlling the medium in the valve body cavity to prevent leakage; the upper end of the stuffing box of the bellows assembly of the present invention is welded to the valve cover, and the lower end is The shaft sleeve is welded with the valve stem to effectively control the fluid in the valve body cavity, thereby forming a multi-stage seal and improving the sealing effect. The valve body of the invention adopts LCB low-temperature carbon steel as a whole for investment casting, which solves the problem that the low-temperature performance of conventional ordinary cast steel can not meet the working conditions. Some manufacturers use nodular cast iron to meet the requirements of relevant national standards, which is easy to corrode and perforate. , The safety hazard is great; the guide block is made of CF8 stainless steel, which solves the problem of rusting, jamming, and even fracture of nodular cast iron in the past, which is safe and reliable.

In the invention, anticorrosive protective coatings are respectively provided on the surfaces of the valve body, the valve flap, the valve cover, and the valve stem in contact with the medium. The anti-corrosion protective coating used is Cr / Cr (X) N nano-composite ceramic coating. After coating, it not only guarantees the internal corrosion protection of the over-current medium, but also guarantees the external corrosion protection of the valve, which solves the valve installation in the open air or the chemical industry. Atmospheric corrosion can achieve the effects of safety, environmental protection and energy saving.

The sealing packing according to the present invention is a multi-stage "V" shaped sealing packing, which enhances the sealing effect, and can effectively control the fluid medium in the valve body cavity after the bellows is damaged due to long-term fatigue, and effectively control the leakage of the medium. Reached zero leakage.

An annular groove is provided on the upper surface of the valve seat, and a seal fitting in a shape of the annular groove is provided in the annular groove; the seal is sintered with the valve seat to improve the sealing performance.

According to the present invention, a frustum is integrally provided on the lower end surface of the valve disc. The frustum is matched with the seal on the valve seat to seal. A contact surface of the frustum and the seal is provided with a hard alloy layer. The alloy layer cooperates with the seal on the surface of the valve seat to form a double cone and flat seal, which fully achieves the design effect of zero leakage in the valve's internal seal; the hard alloy on the valve sealing surface and the polytetrafluoroethylene on the valve sealing surface form a hard and soft seal. Paired, the valve seat has the effect of automatic sealing compensation, so as to achieve a gap-free seal and completely zero leakage.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic structural diagram of the present invention.

FIG. 2 is an enlarged view of part A of FIG. 1.

detailed description

As shown in Figures 1 and 2, the present invention includes a valve body 1, a valve seat 2, a valve disc 3, a bellows assembly 4, a valve cover 5, a valve stem 6, a packing gland 7, a transmission rod 8, a guide block 9, and a transmission. The nut 10, the hand wheel 11, the valve seat 2, the valve disc 3, and the valve stem 6 are respectively disposed in the valve body 1, the valve disc 3 is disposed at the end of the valve stem 6, the valve cover 5 is disposed above the valve body 1, and the valve stem 6 The upper end is floatingly connected to the transmission rod 8 through the guide block 9, and the transmission rod 8 is connected to the hand wheel 11 through the transmission nut 10; the bellows assembly 4 is arranged between the valve cover 5 and the valve stem 6; the bellows assembly 4 includes a bellows 4- 1. A stuffing box 12 is arranged above the bellows 4-1, and the upper end of the stuffing box 12 is welded to the valve cover 5; a positioning sleeve 13 is arranged below the bellows 4-1, and the positioning shaft sleeve 13 is welded to the valve stem 6; A multi-stage "V" shaped packing 14 is provided in 12; a packing gland 7 is disposed above the multi-stage "V" shaped packing 14 and is connected to the valve cover 5 by bolts.

An annular groove is provided on the upper surface of the valve seat 2, and a seal 15 matching the shape of the annular groove is provided in the annular groove; the seal 15 is sintered with the valve seat 2 as a whole; a cone is integrally provided on the lower end surface of the valve disc 3 The table 3-1, the frustum 3-1 and the sealing member 15 on the valve seat 2 cooperate to seal. A contact surface between the frustum 3-1 and the sealing member 15 is provided with a hard alloy layer 16.

Anticorrosive protective coatings 17 are respectively provided on the surfaces of the valve body 1, the valve flap 3, the valve cover 5, and the valve stem 6 in contact with the medium.

Claims

High performance nano-coated bellows chlorine gas special valve, which is characterized by including valve body, valve seat, valve disc, bellows assembly, valve cover, valve stem, packing gland, transmission rod, guide block, transmission nut, hand wheel The valve seat, the valve disc, and the valve stem are respectively disposed in the valve body, the valve disc is disposed at the end of the valve stem; the valve cover is disposed above the valve body; the upper end of the valve stem is floated through the guide block and the transmission lever Connection, the transmission rod is connected with the hand wheel through a transmission nut; the bellows component is arranged between the valve cover and the valve stem; the bellows component includes a bellows, and a stuffing box is arranged above the bellows, the The upper end of the stuffing box is welded to the valve cover; a positioning sleeve is arranged below the bellows, and the positioning shaft sleeve is welded to the valve stem; a sealing packing is arranged in the stuffing box; the packing gland is arranged above the sealing packing and It is bolted to the valve cover.
The high-performance nano-coated bellows chlorine gas special valve according to claim 1, characterized in that: anti-corrosion protective coatings are respectively provided on surfaces of the valve body, the valve flap, the valve cover, and the valve stem in contact with the medium.
The high-performance nano-coated bellows chlorine gas special valve according to claim 1, wherein the sealing packing is a multi-stage "V" shaped sealing packing.
The high-performance nano-coated bellows chlorine gas special valve according to claim 1, characterized in that: the upper surface of the valve seat is provided with an annular groove, and a seal matching the shape of the annular groove is provided in the annular groove. The seal is sintered with the valve seat as a whole.
The high-performance nano-coated bellows chlorine gas special valve according to claim 1, characterized in that: a conical frustum is integrally provided on the lower end surface of the valve disc, and the conical frustum cooperates with a seal on a valve seat to seal. The contact surface between the frustum and the seal is provided with a hard alloy layer.