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Pressure-reducing type unloading valve capable of emptying and manufacturing method thereof

A technology of unloading valve and pressure seat, applied in the field of water control equipment, to achieve the effect of high reliability

Inactive Publication Date: 2017-09-01
NINGBO HUACHENG VALVE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, no matter which structure the unloading valve in the prior art adopts, it will be affected by the essential performance of the first spring. Therefore, the anti-fatigue and impact resistance of the first spring itself is particularly important. Improve the anti-fatigue and anti-impact performance by means of modification and surface shot peening, without changing the shape of the material to improve its anti-fatigue and anti-impact ability under specific working conditions

Method used

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  • Pressure-reducing type unloading valve capable of emptying and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A method for manufacturing an evacuable decompression unloading valve, the unloading valve includes a zinc-manganese brass unloading valve main body 1, a pressure seat 2 matching the zinc-manganese brass unloading valve main body 1, and a limiting structure 6 , anti-fatigue and shock-resistant first spring 3 and the second spring 7 which rotates counter-rotatingly with the first spring 3 and is set in the first spring 3, the piston rod 4 set in the first spring 3 and the second spring 7, and the buffer Device 5, wherein the manufacturing method of the first spring 3 comprises the following steps:

[0023] 1) Pre-preparation

[0024] ① Select beryllium bronze QBe2.0 copper billet as the spring raw material;

[0025] ② Select forging equipment equipped with hydraulic generating device, rotary push device and air cooling device; select vacuum resistance furnace as initial forging heating equipment;

[0026] ③Select four forging hammer heads with 90° forging axes in seque...

Embodiment 2

[0036] The whole is consistent with Example 1, the difference is:

[0037] The manufacturing method of the first spring 3 comprises the following steps:

[0038] ① Heating the beryllium copper QBe2.0 billet through a vacuum resistance furnace to a value higher than its theoretical AC 3 At a temperature of 120°C, keep warm for (15d) min / mm according to the diameter of the copper billet, and then take it out of the furnace, and fix the bottom of the copper billet on the rotary push device;

[0039]②The forging hammer head linked with the rotary push device is pushed by the hydraulic generating device, and the copper billet is extruded into a forging billet with a nearly square cross-section at a feed rate of about 5% for each deformation and a final deformation ratio of 40% to deform the copper billet. The length of one forging deformation of the billet is one forging cycle. After the last forging in one cycle, the forging hammer head is fixed on the surface of the copper bille...

Embodiment 3

[0044] The whole is consistent with Example 1, the difference is:

[0045] The manufacturing method of the first spring 3 comprises the following steps:

[0046] ① Heating the beryllium copper QBe2.0 billet through a vacuum resistance furnace to a value higher than its theoretical AC 3 At a temperature of 130°C, keep warm for (17d) min / mm according to the diameter of the copper billet, and then take it out of the furnace, and fix the bottom of the copper billet on the rotary push device;

[0047] ②The forging hammer head linked with the rotary push device is pushed by the hydraulic generating device, and the copper billet is extruded into a forging billet with a nearly square cross-section at a feed rate of about 5% for each deformation and a final deformation ratio of 45% to deform the copper billet. The length of one forging deformation of the billet is one forging cycle. After the last forging in one cycle, the forging hammer head is fixed on the surface of the copper bill...

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Abstract

The invention relates to a pressure-reducing type unloading valve capable of emptying and a manufacturing method thereof. The unloading valve comprises a zinc-manganese-brass unloading valve body, a pressure seat, a limiting structure, a first spring, a second spring, a piston rod and a buffer device, wherein the pressure seat and the limiting structure are matched with the zinc-manganese-brass unloading valve body, the first spring and the second spring are fatigue-resistant and impact-resistant, and the second spring rotates in the reverse direction of the first spring and is installed in the first spring in a sleeved mode. According to the pressure-reducing type unloading valve, the high-level safety is achieved by adopting the organic combination of the nature-modified and surface-enhanced first spring capable of changing the material shape and structure and the second spring manufactured by the same method as the first spring and rotating reversely.

Description

technical field [0001] The invention relates to the field of water control equipment, in particular to an emptying and decompression unloading valve and a manufacturing method thereof. Background technique [0002] The unloading valve is a valve that reduces the inlet pressure to a certain required outlet pressure through adjustment, and relies on the energy of the medium itself to automatically maintain a stable outlet pressure. From the point of view of fluid mechanics, the pressure reducing valve is a throttling element whose local resistance can be changed, that is, by changing the throttling area, the flow velocity and the kinetic energy of the fluid are changed, resulting in different pressure losses, so as to achieve the purpose of decompression. Then rely on the adjustment of the control and regulation system to balance the fluctuation of the pressure behind the valve with the force of the first spring, so that the pressure behind the valve remains constant within a ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23P15/00
CPCB23P15/001
Inventor 王朝阳彭兴满祝云霞胡志军胡茂松王志清
Owner NINGBO HUACHENG VALVE
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