CN206191047U - All -welded ball valve's multiple seal structure - Google Patents

Abstract

The utility model provides an all -welded ball valve's multiple seal structure, is including setting up at the valve rod of this ball valve neck and the connection lid connected with ball valve neck upper end, be provided with multiple seal structure between ball valve neck and the valve rod, specifically be: the valve rod sets gradually spacer ring, outer, interior triangle expandable graphite, pressure pad, snap ring from low to the height, and the connection that the snap ring is connected by ball valve neck upper end approximately compresses tightly fixedly, be equipped with first, second, the inside and outside slot of third from low in proper order to the height on the spacer ring, O type circle is installed to this ditch inslot. The utility model discloses under the medium masterpiece was used, inside and outside expandable graphite encircled the rebound, and the snap ring of rigidity produces the downward pressure to inside and outside expandable graphite simultaneously, and expandable graphite ring inside and outside like this acts on at last overdraft issues the shape of changing to produce excellent sealed effect.

Description

A kind of multi-sealing structure of all-welded ball valve

Technical field

The utility model is related to all-welded ball valve field, refers specifically to one kind for Gao Long-distance Transmission Pipeline all-welded ball valve Multi-sealing structure.

Background technology

In China's natural gas long distance pipeline construction, high-pressure heavy caliber all-welded is that Long-distance Transmission Pipeline key sets It is one of standby, if valve seal leakage will cause heavy losses to economy and resource, so its sealed reliable is extremely important.Going out During existing external leakage, revealed especially at valve stem seal, main line pipeline can not be closed in time again, brought greatly not to maintenance service Just.Therefore, in order to ensure zero leakage of valve stem seal, design of Sealing Structure is very crucial at valve rod.

Utility model content

It is structure structure multi-sealed at a kind of valve rod of high-pressure heavy caliber all-welded that the utility model is provided, with Reach excellent sealing effectiveness.

Technical solution adopted in the utility model is：

A kind of multi-sealing structure of all-welded ball valve, including be arranged on the valve rod of the ball valve neck and with ball valve neck on The connection lid of connection is held, multi-sealing structure is provided between the ball valve neck and valve rod, specially：Valve rod from low to high according to Secondary setting spacer ring, outer, Triangle ID expanded graphite, pressure pad, snap ring, and snap ring is compressed admittedly by the connection lid that ball valve neck upper end connects It is fixed；First, second, third inside and outside groove, mounting O-shaped rings in the groove are sequentially provided with the spacer ring from low to high.

Inside and outside greasing annular groove is provided between second, third inside and outside groove of the spacer ring, the inside and outside greasing annular groove passes through The mutual UNICOM in hole.

The utility model uses high sealing performance triangle expanded graphite ring structure so that will be every under pressure medium effect Ring is ejected and is pressed in inside and outside expanded graphite ring lower end, and inside and outside expanded graphite ring is moved up, while the snap ring that position is fixed is produced Down force is pressed on pressure pad, and pressure pad produces downward pressure to inside and outside expanded graphite ring, and so inside and outside expanded graphite ring is upper Push under power is acted on and deform, to produce excellent sealing effectiveness.O-ring sealing, emergency sealing greasing dress are provided with simultaneously Put sealing etc. it is multi-sealed ensure that zero leakage at valve rod from structure so that high-pressure heavy caliber all-welded energy on pipeline Long-term use.

The utility model design structure is simple, processing step is few, design is light and handy, low production cost, installs and maintenance also ten Divide simple.

Brief description of the drawings

Fig. 1 is high sealing performance structural representation at the utility model valve rod；

Fig. 2 is Fig. 1 spacing ring structure of leather schematic diagrames；

Fig. 3 is Fig. 1 China and foreign countries triangle intumesced graphite structure schematic diagram；

Fig. 4 is Triangle ID intumesced graphite structure schematic diagram in Fig. 1；

Fig. 5 is pressure pad structural representation in Fig. 1；

Fig. 6 is Snap ring structure schematic diagram in Fig. 1.

Specific embodiment

The utility model is further described below in conjunction with the accompanying drawings.

Fig. 1 is high sealing performance structural representation at utility model valve rod, including valve rod 1, spacer ring 2, outward, Triangle ID expansion The snap ring 7, fixing clasp that graphite 6,11, outer compression, the pressure pad 10 of Triangle ID expanded graphite 6,11, fixed pressure pad 10 are shifted up 7 positions and the terminal pad 8 of connection drive device.These parts constitute a kind of high sealing performance expanded graphite ring after equipping successively Structure.

Expanded graphite ring function admirable, is also valve rod fireproof main seal with fine heat-resisting quantity.Next is additionally provided with Emergency sealing grease pouring device 4, in an emergency situation, to forming injection stop-leak compound in greasing chamber between spacer ring 2 and valve rod 1, preventing or Reduce the leakage of special circumstances lower stem seal.

Fig. 2 is spacing ring structure of leather schematic diagram, and it is provided with outer channel III, II, IV and the in the first, second, third of dress O-ring 2nd, the inside and outside greasing annular groove I in the 3rd between outer channel II, IV.Inside and outside greasing annular groove I is being noted by 4 mutual UNICOMs in hole V The lower section of alicyclic ring groove I is provided with the second of twice O-ring, first groove II, III, and the of one O-ring is provided with the top of greasing annular groove I Three grooves IV.O-ring uses explosion-proof type Viton AED, and its resilience is good, sealed reliable.

Fig. 3,4 are respectively inside and outside expanded graphite ring structure schematic diagram, and Fig. 5 is pressure pad structural representation.Fig. 6 is snap ring knot Structure schematic diagram.Outward, interior expanded graphite ring 6,11 inclined-planes and horizontal line are into 60 ° of angles, and its section is triangular in shape.In pressure pad 10 has Outer two inclined-planes, with horizontal line all into 57.5 ° of angles.Inside and outside the outer, inclined-plane of interior expanded graphite ring 6,11 and pressure pad 10 There is differential seat angle in two inclined-planes, in mutual squeezing action, outer, interior expanded graphite ring 6,11 is deformed and is become apparent from, so that Produce excellent sealing effectiveness.

The utility model ensures zero leakage of valve stem seal in terms of design of Sealing Structure.

Claims (5)

1. a kind of multi-sealing structure of all-welded ball valve, including be arranged on the ball valve neck valve rod and with ball valve neck upper end The connection lid of connection, it is characterised in that：The ball valve neck（14）And valve rod（1）Between be provided with multi-sealing structure, specifically For：Valve rod（1）Spacer ring is set gradually from low to high（2）, outer, Triangle ID expanded graphite（6、11）, pressure pad（10）, snap ring（7）, and Snap ring（7）The connection lid connected by ball valve neck upper end（8）It is fixed；The spacer ring（2）On be sequentially provided with from low to high First, second, third inside and outside groove（Ⅲ、Ⅱ、Ⅳ）, mounting O-shaped rings in the groove.

2. the multi-sealing structure of a kind of all-welded ball valve according to claim 1, it is characterised in that：The spacer ring（2） Second, third inside and outside groove（Ⅱ、Ⅳ）Between be provided with inside and outside greasing annular groove（Ⅰ）, the inside and outside greasing annular groove（Ⅰ）By hole （Ⅴ）Mutual UNICOM.

3. the multi-sealing structure of a kind of all-welded ball valve according to claim 1, it is characterised in that：It is described it is outer, interior three Angle expanded graphite（6、11）And pressure pad（10）Between have differential seat angle.

4. the multi-sealing structure of a kind of all-welded ball valve according to claim 3, it is characterised in that：It is described it is outer, interior three Angle expanded graphite（6、11）Inclined-plane and horizontal line be in 60 ° of angles, and the pressure pad being adapted to therewith（10）Inclined-plane and horizontal line all Into 57.5 °.

5. the multi-sealing structure of a kind of all-welded ball valve according to claim 1, it is characterised in that：The valve rod（1） Covered with connection（8）Between be provided with O-ring（9）.