CN202082422U

CN202082422U - Improved sealing structure of valve seat assembly of hard sealing ball valve

Info

Publication number: CN202082422U
Application number: CN2011201499108U
Authority: CN
Inventors: 周逸亭
Original assignee: Individual
Current assignee: Individual
Priority date: 2011-05-12
Filing date: 2011-05-12
Publication date: 2011-12-21
Anticipated expiration: 2021-05-12

Abstract

The utility model discloses an improved sealing structure of the valve seat assembly of a hard sealing ball valve, which comprises a pressing ring, a sealing ring assembly and a valve seat, and is characterized in that the valve seat and the pressing ring form a slope of 35-45 degrees on the end surface of the side of the sealing ring assembly, a wedge-shaped gap is respectively formed between two side walls of the sealing ring assembly and the slope formed by the valve seat and the pressing ring, the vertical angle of the wedge-shaped gap is less than 3 degrees, and the cross section of the sealing ring assembly is in an inverted ladder shape. In the utility model, as the shape of the sealing ring assembly is changed, the sealing property of the sealing structure of the ball valve is improved, therefore, no leakage is caused under various temperatures and pressures.

Description

A kind of hard seal ball valve valve component sealing configuration of improvement

[technical field]

The utility model relates to a kind of valve seat of valve, is specifically related to a kind of hard seal ball valve valve component sealing configuration of improvement.

[background technique]

In industries such as metallurgy, chemical industry, oil, food, medicine, all on hydraulic pipe line or fluid foods conveyance conduit, ball valve is set usually.Since ball valve with its opening and closing rapidly, good seal performance and generally being adopted.

The basic structure of ball valve is: a ball is set in the inner chamber of valve body, and when valve is in opening state, the through hole in the middle of the ball and the import and export conducting at valve gap two ends, i.e. a section in the through hole formation pipeline; When closing, drive the ball half-twist, make the center line of through hole and pipeline orthogonal, pipeline is blocked with the sphere that the spheroid both sides are smooth by the top valve rod; Be provided with the valve component sealing configuration between valve gap and the spheroid, the sealing structure comprise fixing spring pressure ring, be located at valve seat and valve cover chamber the packing seal ring member and with the valve seat of ball seal, its principle is that the elastic force promotion pressure ring of spring compresses the packing seal ring member, transmit pressure on valve seat by ring assembly, sealing between formation valve seat and spheroid and the sealing between valve seat periphery and the valve gap.

In the prior art, above-mentioned packing seal ring member is made by resistant to elevated temperatures graphite material usually, a kind of effect better seal ring member structure is, form by first, the 3rd layer of Expanded graphite seal ring stack that has the metal wire knitted Expanded graphite seal ring and the second layer respectively, shown in accompanying drawing 1, ring assembly 51 cross sections after its stack are at right angles trapezoidal, trapezoidal bottom constitutes the sealing surface with valve gap 11 inwalls, right angle side constitutes the sealing surface with valve seat 21 end faces, and last base constitutes the sealing surface of fitting with the axial outer wall of valve seat.In the said structure, the main point that may produce seal leakage is, the upper bottom surface of (1) trapezoidal ring assembly 51, and this part directly contacts with outer ring surface, is the main positions that possible leak; (2) between valve seat 21 end faces and the black box,, add with the valve seat end face seal the 3rd layer for having seal ring wiry because the ring member of valve seat end is trapezoidal right angle side, its compressive deformation is less, in case medium enters the valve seat end, promptly easily produce gap leakage, cause leakage; Particularly under the situation of high pressure, high temperature, easier generation leakage problem, this is to be caused by the defective of ring assembly structure own, will have influence on the normal use and the performance of ball valve.

[model utility content]

It is better that the utility model purpose provides a kind of sealability, is applicable to the valve component sealing configuration of all temps condition.

For achieving the above object, the technical solution adopted in the utility model is: a kind of hard seal ball valve valve component sealing configuration of improvement, comprise pressure ring, ring assembly and valve seat, described valve seat and pressure ring are provided with the inclined-plane of 35 °～45 on the end face of nearly ring assembly side, outer periphery are fitted between sidewall that described ring assembly and valve seat are adjacent and the valve seat inclined-plane, big outer little drift angle is less than 3 ° wedge gap in constituting, and described ring assembly cross section is trapezoidal.

In the technique scheme, described valve component sealing configuration is set between valve gap and the valve ball, comprise the pressure ring that is fixed with spring, the packing seal ring member of being located at valve seat and valve cover chamber and with the valve seat of ball seal, the elastic force of spring promotes pressure ring and compresses the packing seal ring member; All be provided with the inclined-plane on the end face of the nearly ring assembly side of described valve seat and pressure ring, ring assembly cooperate with two inclined-planes (and the inclined-plane between reserve the wedge gap of the outer narrow inner width that is 0 °～3 °), thereby the cross section that makes ring assembly is trapezoidal, be that valve bonnet seal face is trapezoidal bottom (longer base), sealing surface of seat is trapezoidal last base (shorter base), so, when gas in valve or liquid base on trapezoidal makes progress the crush seal ring member, enter wedge gap, more up the space is more little, and it is big more to upward pressure, the ring assembly distortion is also big more, and base is butted on the valve gap wall on it again, thereby makes the ring assembly lateral deformation, dwindle the volume in space, strengthened sealing effect; On the other hand, because pressure ring and valve seat two side are the inclined-plane, make between the two groove be wide at the top and narrow at the bottom trapezoidal, so compare with right-angled trapezium, strengthen with the ring assembly of groove fit and the seal f ace width of valve gap, better gas or the liquid that releases between pressure ring and valve seat is sealed, avoid it to ooze in valve body.

In the technique scheme, described ring assembly is made up of first layer seal ring, mesosphere seal ring and three-layer sealed ring stack successively from pressure ring side to valve seat side, described first layer seal ring is for having metal wire knitted Expanded graphite seal ring, and described mesosphere seal ring and three-layer sealed ring are sheet Expanded graphite seal ring.Utilize the deformation rate of the 3rd layer of Expanded graphite seal ring to be higher than the characteristics of the Expanded graphite seal ring that has metal wire knitted, be easier to and valve base sealing after making three-layer sealed ring compressive deformation, realize the zero leakage of ball valve.

Because the technique scheme utilization, the advantage that the utility model compared with prior art has is:

1, since the utility model valve seat and pressure ring respectively the end face of nearly ring assembly side be arranged as the inclined-plane, and ring assembly is mated (less than 3 ° wedge gap), thereby make interior gas of valve or liquid after entering the space, more up the space is more little, when pressure during than the lateral deformation of ambassador's ring assembly, dwindled the space more, sealing effect is better; On the other hand, ring assembly matches with the inclined-plane, both sides and is trapezoidal, with right-angled trapezium in the past relatively, the length that has prolonged the bottom, promptly increased and valve gap between the seal f ace width that seals, more help preventing leakage phenomenon, realize zero leakage;

2, because the three-layer sealed ring of nearly valve seat side adopts more easily deformable Expanded graphite seal ring, seal ring can better be fitted with the valve seat end face behind compressive deformation, improve sealing effect, prevent to leak.

[description of drawings]

Accompanying drawing 1 is the partial schematic sectional view of valve component sealing configuration in the background technique;

Accompanying drawing 2 is the utility model embodiment one a partial schematic sectional view.

Wherein: 1, valve gap; 2, valve seat; 3, pressure ring; 4, spring; 5, ring assembly; 6, first layer seal ring; 7, mesosphere seal ring; 8, three-layer sealed ring; 9, inclined-plane; 11, valve gap; 21, valve seat; 31, pressure ring; 41, spring; 51, ring assembly; 61, first layer seal ring; 71, mesosphere seal ring; 81, three-layer sealed ring; 91, right angle side.

[embodiment]

Below in conjunction with drawings and Examples the utility model is further described:

Embodiment one: shown in accompanying drawing 2, a kind of hard seal ball valve valve component sealing configuration of improvement, comprise the pressure ring 3 that is fixed with spring, be located at 1 of valve seat 2 and valve gap packing seal ring member 5 and with the valve seat of ball seal, the elastic force of spring 4 promotes pressure ring and compresses the packing seal ring member, described valve seat left end face is the inclined-plane 9 of 45, the pressure ring its right end face is the inclined-plane at 50 ° of angles, constitute the cross section and be down trapezoidal ring assembly receiving groove, the left and right sides wall of ring assembly 5 respectively with pressure ring, the inclined-plane of valve seat cooperates, be provided with drift angle therebetween and be 2 ° wedge gap, described ring assembly 5 is by the first layer seal ring 6 of nearly described pressure ring side, three-layer sealed ring 8 stacks of mesosphere seal ring 7 and nearly valve seat side are formed, described first layer seal ring is for having metal wire knitted Expanded graphite seal ring, and described mesosphere seal ring 6 and three-layer sealed ring 7 are sheet Expanded graphite seal ring.

During use, because the cross section of ring assembly 5 is trapezoidal, it is more little to make the interior gas-liquid of valve more up walk the space after carrying out wedge gap, until sealing fully, and the crush seal ring member that upwards pressure, ring assembly distortion (or high temperature deformation), especially the 3rd layer of Expanded graphite seal ring, more dwindle the space, strengthened sealability; On the other hand, prolonged with ring assembly and valve gap between seal f ace width (comparing) with right-angled trapezium in the past, effectively prevent to leak.

Claims

1. the hard seal ball valve valve component sealing configuration of an improvement, comprise pressure ring, ring assembly and valve seat, it is characterized in that: described valve seat and pressure ring are provided with the inclined-plane of 35 °～45 on the end face of nearly ring assembly side, outer periphery are fitted between sidewall that described ring assembly and valve seat are adjacent and the valve seat inclined-plane, big outer little drift angle is less than 3 ° wedge gap in constituting, and described ring assembly cross section is trapezoidal.

2. hard seal ball valve valve component sealing configuration according to claim 1, it is characterized in that: described ring assembly is made up of first layer seal ring, mesosphere seal ring and three-layer sealed ring stack successively from pressure ring side to valve seat side, described first layer seal ring is for having metal wire knitted Expanded graphite seal ring, and described mesosphere seal ring and three-layer sealed ring are sheet Expanded graphite seal ring.