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Low-temperature stop valve

A cut-off valve and low-temperature technology, which is applied in the direction of lifting valves, valve devices, engine components, etc., can solve the problems of increasing the length of valve stems and brackets, increasing manufacturing costs, etc., and achieve the effects of realizing sealing functions, shortening lengths, and reducing manufacturing costs

Inactive Publication Date: 2013-01-02
四川优机实业股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when used in low temperature conditions, according to standard requirements, for valves with the same specification and the same pressure, there are specific requirements for the length of the extension part of the cold box of the valve, because it is necessary to ensure that the temperature of the valve stem packing is kept at an allowable At this time, if the valve structure of the ordinary globe valve is still used and the stem nut is installed outside the pressure-bearing area, the length of the valve stem and bracket must be increased, and the manufacturing cost will be increased.

Method used

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Embodiment Construction

[0015] The present invention will be further described below in conjunction with the accompanying drawings.

[0016] Such as figure 1 As shown in the figure, for ordinary globe valves, the stem nut is installed on the bracket connected to the bonnet. If this structure is used to design low temperature globe valves, such as figure 2 As shown, since the extension length L of the cold box must be guaranteed, the valve stem is already very long, and the structure of fixing the valve stem nut by the bracket is not economical enough.

[0017] Such as image 3 , Figure 4 As shown, the cryogenic globe valve of the present invention includes a valve body 1, a valve cover 4, a valve core 2 and a valve stem 5 connected to the valve core 2, the valve body 1 is flanged to the valve cover 4, and the valve stem 5 is connected to the valve cover 4 There is a stuffing box 3 between them, and the packing filled in the stuffing box 3 is pressed and fixed by the packing gland 9 and the packi...

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Abstract

The invention discloses a low-temperature stop valve which can reduce the manufacturing cost. The low-temperature stop valve comprises a valve body, a valve cover, a valve core and a valve rod which is connected with the valve core, wherein a stuffing box is arranged between the valve rod and the valve cover; the valve rod is in threaded connection with a valve rod nut; the valve rod nut is fixed relative to the valve cover; the valve rod nut is positioned in a pressure-bearing area between the stuffing box and the valve core and is fixedly connected to the valve cover; a shaft shoulder is arranged on the valve rod; chamfering matched with the shaft shoulder is arranged on the valve rod nut so as to form conical sealing; and when the valve core is completely opened, the valve rod nut, the valve cover and the valve rod are matched to form a sealing structure. The filler can be conveniently replaced, and the valve can be conveniently maintained. According to the structural design, the lengths of the valve rod and the bracket can be shortened, and the manufacturing cost is reduced.

Description

technical field [0001] The invention relates to a cut-off valve, in particular to a low-temperature cut-off valve. Background technique [0002] The valve structure of an ordinary globe valve includes a valve body, a bonnet, a valve core and a valve stem connected to the valve core. A stuffing box is arranged between the valve stem and the valve cover. On the bonnet, there is a handwheel at the end of the valve stem. When the handwheel is turned, the valve stem moves up and down along the valve stem nut within a certain stroke range, thereby adjusting the opening of the valve core to realize the opening or closing of the valve. [0003] The stem nut of the ordinary globe valve is installed outside the pressure-bearing area, and it is mainly used for normal temperature conditions. However, when used in low temperature conditions, according to the standard requirements, for valves with the same specification and the same pressure, the length of the extension part of the cold ...

Claims

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Application Information

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IPC IPC(8): F16K1/00F16K1/32
Inventor 不公告发明人
Owner 四川优机实业股份有限公司
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