CN2338544Y

CN2338544Y - Structure of leakage-proof and durable globe valve

Info

Publication number: CN2338544Y
Application number: CN 98225211
Authority: CN
Inventors: 陈西火
Original assignee: Individual
Current assignee: Individual
Priority date: 1998-09-23
Filing date: 1998-09-23
Publication date: 1999-09-15
Anticipated expiration: 2008-09-23

Abstract

The utility model relates to a structure of leakage-proof and durable stop valve. The utility model comprises a valve core and a valve seat. One end surface of the contact end surfaces between the valve core and the valve seat is formed into a ring, and the other end surface between the valve core and the valve seat is inlaid with a flexible sealing ring pad. The ring and the flexible sealing ring pad are contacted, matched, and sealed. The ring end surface with the circular arc transition is the optimal. The flexible sealing ring pad which is made of the polytetrafluoroethylene is the optimal, and the polytetrafluoroethylene adulterated with the bronze powder is the optimal. The place between the valve seat and the valve core is lined with the sealing ring pad and adopts the ring sealing contact surface, and therefore, the sealing performance and the self lubricating performance are enhanced. The utility model has the advantages of wear resistance and high rigidity.

Description

A kind of anti-leakage durable structure of cut-off valve

The utility model relates to a kind of stop valve structure.

Valve on industry and domestic use of water pipeline generally all adopts stop valve at present, comprise the water tap that generally uses in the family, sealing surface between its spool and the valve seat has two kinds of plane and the conical surfaces, wherein conical surface seal is owing to reduced sealing contact surface, thereby under same active force effect, active force on the unit area increases, sealability is also better, and just in case have hard material also to be difficult for being stuck on the sealing surface in the fluid, can therefore not damage sealing surface, but this class stop valve length service time one is leaked easily, its reason is that valve seat and spool generally all adopt Cuprum alloy, because the both is a hard material, its sealing surface is wearing and tearing or damage easily, finally causes sealing effect bad; On this problem, the flat closed type stop valve can solve with flexible gasket by directly serving as a contrast between spool and valve seat, as the disclosed structure that comes to this of Chinese utility model patent 93206030.7 " leakproof stop valve ", but the sealing contact surface of plane sealing is big, active force on unit area under the same active force effect is less, sealability is affected, also damage because of there being hard material to be stuck on the sealing surface in the fluid easily, conical surface seal type stop valve is then because of the direct lining flexible gasket of its structural limitations.

The purpose of this utility model provides a kind of both leakproofs durable stop valve structure with regard to being at above-mentioned prior art present situation.

The purpose of this utility model is achieved in that anti-leakage durable structure of cut-off valve comprises spool and valve seat, and an end face in the end face that is in contact with one another between them is annular, and another end face is embedded with the flexible seal ring pad, and both are in contact with one another cooperation and seal.Described annular end face is good with what arc transition was arranged; Described flexible seal ring pad is good with what made by teflon, and with the employing of mixing the teflon of bronze powder being arranged especially is the best.

Compared with prior art, owing between spool of the present utility model and the valve seat flexible seal ring pad has been arranged, the surface of contact of ring packing has simultaneously reduced sealing contact surface again effectively, thereby sealability and self lubricity have been strengthened, wear-resisting and have rigidity, thereby not only durable, sealing effect but also good, can be used for comprising the stop valve of the existing various structures of water tap.

Description of drawings.

Fig. 1 is the utility model embodiment one a structure cross-sectional schematic.

Fig. 2 is the enlarged diagram of spool among Fig. 1 (1) and valve seat (3) connection part.

The structural representation of flexible seal ring pad (2) among Fig. 3 bitmap 1, Fig. 2.

Fig. 4 is the utility model embodiment two a structure cross-sectional schematic.

Fig. 5 is the enlarged diagram of spool and valve seat connection part among Fig. 4.

Embodiment is described in further detail the utility model below in conjunction with accompanying drawing.

As shown in Figure 1 and Figure 2, be applied to an embodiment of common pipe stop valve for the utility model, (1) is spool among the figure, (2) be flexible seal ring pad (being the seal ring form in the present embodiment), (3) be valve seat, (4) be valve body, (5) be handwheel, (6) are back of the body cap, and (7) are gland, (8) be filler, (9) be valve rod, (10) are valve gap, and valve rod (9) end is spool (1), described spool (1) end face central position mills sky and ringwise, annular end face with have arc transition for good; Sealed loop-pad (2) is embedded in valve seat (3) and goes up in the annular groove relative with spool (1) annular end face, take off for making its easy embedding difficulty, sealed loop-pad (2) can be structure as shown in Figure 3, the position of corresponding valve seat (3) step of its periphery has groove, its end has chamfering, and the tail position diameter of valve seat (3) annular groove forms a step slightly greatly, because the existence of the terminal chamfering of sealed loop-pad (2), thereby sealed loop-pad (2) can be out of shape and in the annular groove of inserted valve seat (3) slightly, after treating all to embed, the end of sealed loop-pad (2) resiles at the afterbody of valve seat (3) annular groove, thereby cooperatively interacts and spacing with step in valve seat (3) annular groove; When stop valve was in closed condition, the annular end face of described spool (1) tightly was pressed on the described sealed loop-pad (2).

As Fig. 4, shown in Figure 5, be applied to an embodiment of ordinary faucet for the utility model, each parts and label are all consistent with Fig. 1 among the figure, difference is: sealed loop-pad (2) is embedded in the groove of spool (1) head, and valve seat (3) (can with valve body (1) one, also can be individual components and be connected with valve body (1)) annular end face of projection arranged, equally this annular end face with have arc transition for good; Take off for making the easy embedding difficulty of sealed loop-pad (2), its structure can be with reference to Fig. 3, same as above, and the fluted tail position diameter of spool (1) head forms a step slightly greatly, during installation, sealed loop-pad (2) can be out of shape slightly and embed the groove of spool (1) head, after treating all to embed, the end of sealed loop-pad (2) resiles at the afterbody of spool (1) head recess, thereby cooperatively interacts and spacing with step in spool (1) head recess; When stop valve was in closed condition, described sealed loop-pad (2) tightly was pressed on described valve seat (3) annular end face;

Sealed loop-pad in the present embodiment (2) form of packers can certainly be the seal ring form as embodiment one, and what corresponding simultaneously spool (1) head was opened is an annular groove.

Described sealed loop-pad (2) can be made by existing various sealing materials, as teflon, perfluoroethylene-propylene, nylon (polyamide) etc., but test shows, the effect of teflon is better, have certain rigidity and compressive strength, and anti-aging, corrosion-resistant, friction factor is extremely low, self-lubricating property is good, and can use for a long time in-100 ℃～200 ℃ scopes; For the wear resistance of reinforced TFE, improve cold flow properties, can mix up strengthening agent therein, as anti-wear agents such as bronze powder, glass fibres, oiling agents such as graphite, molybdenum disulfide are made composite material, wherein with doping bronze powder best results.

When reality is used, because when described sealed loop-pad (2) wore and tore, the annular end face of its relative spool (1) or valve seat (3) is just and then displacement also, makes and remains good sealing state between the two.

Claims

1. an anti-leakage durable structure of cut-off valve comprises spool and valve seat, it is characterized in that in the end face that described spool and valve seat are in contact with one another, one of them end face is an annular, and another end face is embedded with the flexible seal ring pad, and both are in contact with one another and cooperate and seal.

2. anti-leakage durable structure of cut-off valve as claimed in claim 1 is characterized in that in the end face that spool and valve seat are in contact with one another, the end face of spool is an annular, is embedded with the flexible seal ring pad on the end face of valve seat.

3. anti-leakage durable structure of cut-off valve as claimed in claim 2 is characterized in that described spool annular end face is arc transition.

4. as claim 2 or 3 described anti-leakage durable structure of cut-off valve, the periphery that it is characterized in that described flexible seal ring pad has groove, its end has chamfering, described valve seat has an annular groove, and its tail position diameter forms a step slightly greatly, and the flexible seal ring pad embeds in this groove, and after treating all to embed, the end of flexible seal ring pad resiles at the afterbody of seat ring connected in star, thereby cooperatively interacts and spacing with step in the seat ring connected in star.

5. anti-leakage durable structure of cut-off valve as claimed in claim 1 is characterized in that in the end face that spool and valve seat are in contact with one another, the end face of valve seat is an annular, is embedded with the flexible seal ring pad on the end face of spool.

6. anti-leakage durable structure of cut-off valve as claimed in claim 5 is characterized in that described valve seat annular end face is arc transition.

7. as claim 5 or 6 described anti-leakage durable structure of cut-off valve, the periphery that it is characterized in that described flexible seal ring pad has groove, its end has chamfering, and the spool head has groove and the tail position diameter forms a step slightly greatly, the flexible seal ring pad embeds in this groove, after treating all to embed, the end of flexible seal ring pad resiles at the afterbody of spool head recess, thereby cooperatively interacts and spacing with step in the spool head recess;

8. as the described anti-leakage durable structure of cut-off valve of claim 1 to 7, it is characterized in that described sealed loop-pad made by teflon.

9. as the described anti-leakage durable structure of cut-off valve of claim 1 to 7, it is characterized in that described sealed loop-pad made by the composite material that teflon is doped with strengthening agent such as wear-resisting, lubricated.

10. as the described anti-leakage durable structure of cut-off valve of claim 1 to 7, it is characterized in that described sealed loop-pad made by perfluoroethylene-propylene.