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Gate valve packing structure

A technology for gate valves and stuffing boxes, applied in sliding valves, valve details, valve devices, etc., can solve problems affecting valve operation, small opening torque, and short structural length

Inactive Publication Date: 2015-03-25
SUZHOU WUZHONG DISTRICT DALU ELECTRIC EQUIP FACTORY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It has the advantages of small opening torque and short structural length. However, medium leakage sometimes occurs at the stem seal of the flat gate valve during long-term use. This kind of leakage is very difficult to deal with now, which affects the normal operation of the valve.

Method used

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  • Gate valve packing structure

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Embodiment Construction

[0011] The present invention is described below in conjunction with accompanying drawing.

[0012] attached figure 1 It is a gate valve packing structure according to the present invention, including a valve cover 1, a valve stem 2, and a bracket 3; the bracket 3 and the valve cover 1 are fixedly connected by bolts 4; Stuffing box 5; the valve stem 2 is installed in the stuffing box 5; flexible graphite 6 is arranged between the stuffing box 5 and the valve stem 2; the flexible graphite 6 is pressed in the stuffing box 5 through the packing gland 7 The packing gland 7 is provided with a screw 8 connected to the bracket 3; a spring 9 is also provided between the stuffing box 5 and the packing gland 7; one end of the spring 9 is pressed against the bottom of the packing gland 7 , the other end is tight on the sealing ring 10 at the upper end of the stuffing box 5; the valve stem 2 extends out of the packing gland 7 and is also provided with a locking ring 11; the connection bet...

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PUM

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Abstract

The invention discloses a gate valve packing structure. The gate valve packing structure comprises a valve deck, a valve rod and supports. The supports are fixedly connected with the valve deck through bolts. A packing box is fixedly installed on the valve deck through the supports. The valve rod is installed in the packing box. Flexible graphite is arranged between the packing box and the valve rod and compressed in the packing box through a packing gland. The packing gland is provided with threaded rods connected with the supports. A spring is further arranged between the packing box and the packing gland. One end of the spring abuts against the bottom of the packing gland, and the other end of the spring abuts against a seal ring at the upper end of the packing box. A locking ring is further arranged at the end, extending out of the packing gland, of the valve rod. According to the scheme, the packing gland can make no contact with the packing box directly, damage is avoided, and the effect of packing sealing can be well achieved; when the valve rod moves and the packing is abraded and leaked, valve rod sealing can be achieved by repeating the operations.

Description

technical field [0001] The invention relates to a gate valve packing structure, which belongs to the technical field of flat gate valves. Background technique [0002] Slab gate valves have been widely used in petroleum, chemical industry, long-distance pipelines, oil terminals and irrigation areas. Slab gate valves have good sealing performance and long service life. It has the advantages of small opening torque and short structural length. However, medium leakage sometimes occurs at the stem seal of the flat gate valve during long-term use. This leakage is very difficult to deal with now, which affects the normal operation of the valve. Contents of the invention [0003] In view of the above-mentioned existing technical problems, the object of the present invention is to propose a gate valve packing structure with good sealing effect. [0004] The technical solution of the present invention is achieved as follows: a gate valve packing structure, including a valve cover,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16K41/02
CPCF16K41/02F16K3/30
Inventor 钱永清
Owner SUZHOU WUZHONG DISTRICT DALU ELECTRIC EQUIP FACTORY