A production process of a bellows assembly

A bellows assembly and production process technology, applied in the field of bellows assembly production technology, can solve the problems of unilateral wear of valve stem and valve seat, high frequency of maintenance and inspection, easy occurrence of cracks, etc., to avoid wear, strength Increased, high structural stability effect

Active Publication Date: 2022-07-29
WENZHOU JINBO VALVE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this bellows assembly also has certain defects. The valve stem bends axially with the prolongation of the service period, resulting in severe one-sided wear between the valve stem and the valve seat. In addition, the bellows and valve Seats, and the welding between the bellows and the valve clack are prone to cracks as the bellows switch and oscillate, so the frequency of later maintenance and inspection is higher

Method used

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  • A production process of a bellows assembly
  • A production process of a bellows assembly
  • A production process of a bellows assembly

Examples

Experimental program
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Effect test

Embodiment 1

[0028] The production process includes:

[0029] (1) Prefabricate the valve stem according to the required size, and leave 0.2±0.02mm at the bottom of the valve stem;

[0030] (2) Heat treatment of the valve stem: place the valve stem in a heat treatment furnace, and heat it to 600°C for 30 minutes; heat it to 800°C for 30 minutes; heat it to 1230°C for 30 minutes; The valve stem is placed in a cooling container, the temperature is cooled to -80 °C, and the temperature is kept for 90 minutes; the valve stem is subjected to the first-stage tempering treatment, tempered to 150 °C, and kept for 90 minutes; the valve stem is subjected to the second-stage tempering treatment: tempering Fire to 150℃ and keep warm for 90min;

[0031] (3) Use a hard grinder to hard grind the bottom end of the valve stem, add W5 diamond powder during the hard grinding process, the machine tool speed is 50-70rpm, the pressure is 2-3atm, the grinding amount per unit time is 0.0002-0.0005mm / hour, and the...

Embodiment 2

[0040] The production process includes:

[0041] (1) Prefabricate the valve stem according to the required size, and leave 0.2±0.02mm at the bottom of the valve stem;

[0042] (2) Heat treatment of the valve stem: place the valve stem in a heat treatment furnace, heat it to 600°C for 30 minutes; heat it to 800°C for 30 minutes; heat it to 1230°C for 30 minutes; The valve stem is placed in a cooling container, cooled to -80°C, and kept for 100 minutes; the valve stem is tempered at the first stage, tempered to 150°C, and kept for 120 minutes; the valve stem is subjected to the second-stage tempering treatment: tempering Fire to 150°C and keep warm for at least 90min;

[0043] (3) Use a hard grinder to hard grind the bottom end of the valve stem, add W5 diamond powder during the hard grinding process, the machine tool speed is 50-70rpm, the pressure is 2-3atm, the grinding amount per unit time is 0.0002-0.0005mm / hour, and the grinding is Stop when the actual length of the valv...

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Abstract

The invention discloses a production process of a bellows assembly. The process comprises the following steps: prefabricating a valve stem according to the required size; heat-treating the valve stem; hard grinding the bottom end of the valve stem with a hard grinder; welding a bellows pipe and a bellows pipe seat group; perform stress heat treatment on the welded bellows and valve seat; use a press to bend the shrapnel of the valve disc towards the connecting groove and abut against the shaft shoulder; weld the valve disc with the bellows and valve seat; Bellows and valve seat are subjected to stress heat treatment. The bellows assembly of the present invention is not prone to cracking of the weld seam after long-term use, and the strength of the bellows assembly and the valve stem after heat treatment increases, which reduces the axial bending deformation of the valve stem to a certain extent. High stability, avoids internal wear of the bellows assembly and unilateral pressure (wear force) on the valve body caused by the overall axial deformation of the bellows assembly, and does not require frequent downtime for overhaul and maintenance.

Description

technical field [0001] The invention relates to the field of a bellows valve, in particular to a production process of a bellows assembly. Background technique [0002] Valves with bellows as the valve stem sealing element are often used in applications with strict requirements on valve stem sealing, such as high vacuum applications and in the nuclear industry. Use bellows to replace the stuffing box on ordinary valves or use it together with the stuffing box. The common ones are bellows globe valves and bellows gate valves. In order to facilitate the assembly of the bellows gate valve or globe valve, the assembly of the bellows, the valve disc and the valve stem has already appeared in the prior art. When the bellows valve is assembled, the assembly is integrally installed inside the valve body, and the process is simple. ,Convenient. However, this bellows assembly also has certain defects. With the extension of the use cycle, the valve stem is axially bent, resulting in...

Claims

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Application Information

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Patent Type & AuthorityPatents(China)
IPC IPC(8): B23P15/00F16K41/10
CPCB23P15/001F16K41/10
Inventor杨选成杨贤珍林学佳蒋丽达
OwnerWENZHOU JINBO VALVE