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Inner-equilibrium side-valve type high-pressure hand-operated block valve

A shut-off valve and internal balance technology, applied in sliding valves, valve devices, engine components, etc., can solve the problems of shut-off valve internal leakage failure, short valve service life, difficulty, etc., to achieve simple overall structure, prolong sealing life, operation handy effect

Inactive Publication Date: 2015-06-17
SHANGHAI MEISHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing high-pressure cut-off valve mainly has the following problems during use: 1. It is laborious to open the valve under high pressure after it is closed, because the pressure of the high-pressure medium only acts on one side of the valve core (or both sides but the action area is not large) as large), so that the spool is subjected to a large unbalanced force, and it is difficult to move the spool manually
2. After most of the cut-off valves with poppet valve structure are opened, the high-pressure and high-speed flowing medium will directly act on the valve core and seal, resulting in wear and damage of the valve core and seal, internal leakage failure of the cut-off valve, and short service life of the valve.
[0004] Chinese patent CN200920288252.3 discloses a "high-pressure water descaling balanced double-acting manual gate valve" and patent CN201020163332.9 discloses a "metallurgical descaling Jet valve", "High pressure water descaling balanced double-acting manual gate valve" is a manual cone valve structure. After the valve is opened, the high-pressure and high-speed flowing medium will directly act on the valve core and seal, causing the valve core and seal to wear and tear. damaged, short service life
The valve core of "Descaling Jet Valve for Metallurgy" adopts a slide valve structure, which is driven by a cylinder, but the cross-sectional area of ​​the upper part of the valve core is smaller than that of the lower part of the valve core. When the high-pressure medium acts on the upper and lower sides, it will produce An unbalanced force (upward force), if it is changed to human drive, it will also appear laborious

Method used

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  • Inner-equilibrium side-valve type high-pressure hand-operated block valve
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] see figure 1 , an internal balance spool type high-pressure manual shut-off valve, the shut-off valve includes a shut-off valve body, the shut-off valve body includes a valve stem 4, a valve core 8 used in conjunction with the lower end of the valve stem, the upper end of the valve stem is connected to the The threaded support 2 cooperates with each other, and the upper end of the threaded support 2 is connected with a driving device. The rotation of the driving device drives the valve stem 4. The external thread on the valve stem 4 interacts with the internal thread of the threaded support 2, and then drives the valve core. 8 to move up.

Embodiment 2

[0023] see figure 2 , as an improvement of the present invention, the spool is set as a stepped spool 8 . This setting is ingenious, because the valve core structure is set as a stepped structure, the cross-sectional area of ​​the lower end surface of the valve core plus the cross-sectional area of ​​the lower end surface of the valve stem is equal to the cross-sectional area of ​​the upper end surface of the valve core. According to the fact that the force is equal to the pressure multiplied by the action area, Equal upper and lower acting areas can make the force of the high-pressure medium acting on both ends of the valve core equal, and the valve core can be in a balanced state. At this time, the driving device only needs to overcome a little seal and screw pair friction, which greatly reduces the driving device. load capacity. The rest of the structures and advantages are exactly the same as in Embodiment 1.

Embodiment 3

[0025] see figure 1 , as an improvement of the present invention, there is a waist-shaped hole in the middle of the valve core 8, so that the pressure medium of the stepped valve core communicates with the inside and outside, the number of the waist-shaped hole is at least one, and its actual size and number depend on the cut-off The design flow rate when the valve is open. The rest of the structures and advantages are exactly the same as in Embodiment 1.

[0026]

[0027] As an improvement of the present invention, the valve body is provided with seals, and the number of seals is set to 4,

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Abstract

The invention relates to an inner-equilibrium side-valve type high-pressure hand-operated block valve. The inner-equilibrium side-valve type high-pressure hand-operated block valve is characterized in that the block valve comprises a block valve body, the block valve body comprises a valve rod and a valve element used cooperatively with the lower end of the valve rod, the upper end of the valve rod is cooperated with a thread supporting seat, the upper end of the thread supporting seat is connected with a driving device, the valve rod is driven through the rotation of the driving device, and the external thread on the valve rod is interacted with the internal thread on the thread supporting seat, so that the valve element is driven to move upward. According to the technical scheme, the sectional area of the lower end face of the valve element with the addition of the sectional area of the lower end face of the valve rod is equal to the sectional area of the upper end of the valve element, according to the principle that force is equal to pressure multiplies action area, forces of high pressure medium exerting on the two ends of the valve element are equal due to that the lower action area and the upper action areas are equal, the valve element can be in equilibrium, and at the moment, the diving device only needs to overcome friction between a seal and a screw pair; when the block valve is opened, a medium flowing with high speed and high pressure cannot contact with seal, and the service life of the seal can be prolonged.

Description

technical field [0001] The invention relates to a shut-off valve, in particular to an internal balance slide valve type high-pressure manual shut-off valve, which belongs to the technical field of design and manufacture of high-pressure medium system valves. [0002] Background technique [0003] The valve is a control component in the fluid delivery system, which has functions such as cut-off, adjustment, flow diversion, reverse flow prevention, pressure stabilization, flow diversion or overflow pressure relief. Valves used in fluid control systems range from the simplest cut-off valves to various valves used in extremely complex automatic control systems, with a wide variety of varieties and specifications. Valves can be used to control the flow of various types of fluids such as air, water, steam, various corrosive media, mud, oil, liquid metal and radioactive media. The cut-off valve, also known as the closed-circuit valve, is used to connect or cut off the medium in t...

Claims

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Application Information

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IPC IPC(8): F16K3/26F16K3/314
CPCF16K3/26F16K3/314
Inventor 袁亚东吴索团
Owner SHANGHAI MEISHAN IRON & STEEL CO LTD