CN203627856U

CN203627856U - Forged steel gate valve

Info

Publication number: CN203627856U
Application number: CN201320875224.8U
Authority: CN
Inventors: 黄云治; 苏显勇
Original assignee: ZHEJIANG KEZHENG VALVE Co Ltd
Current assignee: ZHEJIANG KEZHENG VALVE Co Ltd
Priority date: 2013-12-27
Filing date: 2013-12-27
Publication date: 2014-06-04
Anticipated expiration: 2023-12-27

Abstract

The utility model relates to a forged steel gate valve. The forged steel gate valve mainly solves the problem that sealing performance between a valve body and a valve cover is poor. The forged steel gate valve is characterized in that a self-tightening seat (6) is arranged at the center of the lower end of the valve cover (5), the self-tightening seat (6) penetrates through the lower end of the valve cover (5) and can axially slide relative to the valve cover (5), a stepped hole (8) sequentially increscent in hole diameter from inside to outside is arranged on the valve body (1), the valve cover (5) is arranged in an outer hole (11) through a threaded connection, the lower portion of a thread segment of the valve cover (5) is cylindrical and placed in a middle hole (10), a sealing ring (12) is arranged in the middle hole (10) between the self-tightening seat (6) and the valve cover (5), the upper end of the self-tightening seat (6) is stretched out of the valve cover (5) and provided with a lifting nut (13), and a valve rod (4) penetrates through the self-tightening seat (6) and is sealed through padding (14). The forged steel gate valve adopts structures of the self-tightening seat and the sealing ring, and has good sealing effects under high pressure working conditions.

Description

Forged steel gate valve

Technical field

The utility model relates to valve field, is specifically related to a kind of forged steel gate valve.

Background technique

Gate valve is a kind of valve often having, and is mainly used in blocking or connecting the medium in pipeline.Existing gate valve is mainly by valve body, valve gap, valve plate and valve rod composition, between valve body and valve gap, conventionally adopt flange bolt to be connected, because the volume of the valve body with flange is larger, in the time adopting the mode of forging to process valve body, be difficult to flange to process, thereby between the valve body forging and valve gap, be generally to adopt to be threaded, be that valve gap is screwed in valve body by the mode of screw thread, this Placement of valve body and valve gap and the sealing configuration of flange connection are different, conventionally between valve body and valve gap, seal ring being set seals, there is following technological deficiency in this gate valve: due to the reason of structure, seal ring need to have larger pretightening force extruding just can reach good sealing effect, in use, if the thread looseness of valve gap just there will be leakage, and seal ring also easily damages, sealing effect is poor.

Model utility content

In order to overcome the deficiency of the poor sealing performance between valve body and the valve gap of existing gate valve, the utility model provides a kind of forged steel gate valve, and this forged steel gate valve adopts the structure of self-tightening seat and seal ring, under high pressure operating mode, has good sealing effect.

The technical solution of the utility model is: this forged steel gate valve, comprise valve body, valve seat, flashboard, valve rod and valve gap, valve seat is installed in valve body, described flashboard is connected with valve rod, the center of valve gap lower end is provided with self-tightening seat, self-tightening seat penetrates valve gap lower end and can slide axially by relative valve gap, and the lower end of self-tightening seat is provided with up-small and down-big cone; Valve body is provided with the shoulder hole that aperture increases successively from inside to outside, shoulder hole is divided into endoporus, intermediate hole and outer hole, valve gap is threaded outside in hole, on valve gap, the bottom of thread section is cylindric and is placed in intermediate hole, in intermediate hole between self-tightening seat and valve gap, be provided with seal ring, lower end and the cone of described seal ring match, and seal ring is made up of steel wire and Expanded graphite; Self-tightening seat upper end is stretched out valve gap and is connected with hoisting nut, and valve rod passes and by packing seal from self-tightening seat.

Described filler upper end is provided with filler pressing sleeve and hold-down grid successively, and hold-down grid is connected with the swing bolt being hinged on valve gap.

The utlity model has following beneficial effect: owing to taking technique scheme, the upper end of seal ring is spacing by valve gap, hoisting nut has certain pretightening force, can carry certain pressure medium, in the time that pressure medium exceeds this force value, self-tightening seat upwards has micro-displacement under the effect of pressure medium, the suffered extruding force of seal ring increases, form selfsealings, under high pressure operating mode, between valve body and valve gap, there is good sealing effect.

Accompanying drawing explanation

Accompanying drawing 1 is structure sectional view of the present utility model.

1-valve body in figure, 2-valve seat, 3-flashboard, 4-valve rod, 5-valve gap, 6-self-tightening seat, 7-cone, 8-shoulder hole, 9-endoporus, 10-intermediate hole, the outer hole of 11-, 12-seal ring, 13-hoisting nut, 14-filler, 15-filler pressing sleeve, 16-hold-down grid, 17-swing bolt.

Embodiment

Below in conjunction with accompanying drawing, the utility model is described in further detail:

As shown in Figure 1, this forged steel gate valve, comprises valve body 1, valve seat 2, flashboard 3 valve rods 4 and valve gap 5, valve seat 2 is installed in valve body 1, and described flashboard 3 is connected with valve rod 4, and valve gap 5 is provided with " side " shape head, mainly can block when screwing valve gap 5, installation or removal valve gap 5 convenience.The center of valve gap 5 lower ends is provided with self-tightening seat 6, and self-tightening seat 6 penetrates valve gap 5 lower ends and can slide axially by relative valve gap 5, and the lower end of self-tightening seat 6 is provided with up-small and down-big cone 7; Valve body 1 is provided with the shoulder hole 8 that aperture increases successively from inside to outside, shoulder hole 8 is divided into endoporus 9, intermediate hole 10 and outer hole 11, valve gap 5 is threaded outside in hole 11, on valve gap 5, the bottom of thread section is cylindric and is placed in intermediate hole 10, in intermediate hole 10 between self-tightening seat 6 and valve gap 5, be provided with seal ring 12, lower end and the cone 7 of described seal ring 12 match, and seal ring 12 is made up of steel wire and Expanded graphite; Self-tightening seat 6 upper ends are stretched out valve gap 5 and are provided with hoisting nut 13, and valve rod 4 passes and seals by filler 14 from self-tightening seat 6.Owing to taking technique scheme, the upper end of seal ring 12 is spacing by valve gap 5, rotary lifting nut 13 rises the relative valve gap 5 of self-tightening seat 6, cone 7 crush seal rings 12, because seal ring 12 is made up of steel wire and Expanded graphite, there is better intensity and flexibility, guarantee that seal ring 12 can bear larger pressure in the time being squeezed, and Expanded graphite has lubrication, reduce the frictional force between seal ring 12 and each assembly, increase working life, after seal ring 12 is squeezed, be out of shape and be adjacent to valve body 1 and self-tightening seat 6 tightening seals, realize sealing.In the time of assembling, hoisting nut 13 has certain pretightening force, can carry certain pressure medium, in the time that pressure medium exceeds this force value, self-tightening seat 6 upwards has micro-displacement under the effect of pressure medium, and the suffered extruding force of seal ring 12 increases, and forms selfsealings, under high pressure operating mode, between valve body 1 and valve gap 5, there is good sealing effect.

Described filler 14 upper ends are provided with filler pressing sleeve 15 and hold-down grid 16 successively, and hold-down grid 16 is connected with the swing bolt 17 being hinged on valve gap 5.In the present embodiment, filler 14 is also made up of steel wire and Expanded graphite, has good self lubricity and sealing effect.

Claims

1. a forged steel gate valve, comprise valve body (1), valve seat (2), flashboard (3), valve rod (4) and valve gap (5), valve seat (2) is installed in valve body (1), described flashboard (3) is connected with valve rod (4), it is characterized in that: the center of valve gap (5) lower end is provided with self-tightening seat (6), self-tightening seat (6) penetrates valve gap (5) lower end and can slide axially by relative valve gap (5), and the lower end of self-tightening seat (6) is provided with up-small and down-big cone (7), valve body (1) is provided with the shoulder hole (8) that aperture increases successively from inside to outside, shoulder hole (8) is divided into endoporus (9), intermediate hole (10) and outer hole (11), valve gap (5) is threaded outside in hole (11), the bottom of the upper thread section of valve gap (5) is cylindric and is placed in intermediate hole (10), in intermediate hole (10) between self-tightening seat (6) and valve gap (5), be provided with seal ring (12), lower end and the cone (7) of described seal ring (12) match, seal ring (12) is made up of steel wire and Expanded graphite, self-tightening seat (6) upper end is stretched out valve gap (5) and is provided with hoisting nut (13), and valve rod (4) passes and passes through filler (14) from self-tightening seat (6) and seals.

2. forged steel gate valve according to claim 1, it is characterized in that: described filler (14) upper end is provided with filler pressing sleeve (15) and hold-down grid (16) successively, hold-down grid (16) is connected with the swing bolt (17) being hinged on valve gap (5).