CN203131127U

CN203131127U - Ultrahigh pressure grease injecting joint

Info

Publication number: CN203131127U
Application number: CN 201320011008
Authority: CN
Inventors: 孙国安; 刘丽佳
Original assignee: SHANGHAI XINLIAN VALVE CO Ltd
Current assignee: SHANGHAI XINLIAN VALVE CO Ltd
Priority date: 2013-01-10
Filing date: 2013-01-10
Publication date: 2013-08-14
Anticipated expiration: 2023-01-10

Abstract

The utility model relates to the field of petroleum pipeline valves, in particular to an ultrahigh pressure grease injecting joint. The ultrahigh pressure grease injecting joint comprises a valve bonnet, a valve body, a stop bead and a reset spring, wherein the stop bead and the reset spring are arranged inside the valve body. The ultrahigh pressure grease injecting joint is characterized in that the valve body comprises a parent body and a valve core, a through hole is formed in the parent body, the valve core is arranged inside through hole of the parent body and can rotate in the axial direction, the parent body is connected with the valve bonnet in a sealed mode, a step through hole is formed inside the valve core, the stop bead and the reset spring are arranged inside a large hole of the step through hole so as to achieved one-way communication, a boss is arranged inside the valve bonnet, and the valve bonnet is contacted with a small hole of the step through hole inside the valve core in a sealed mode through the boss. According to the structural design, compared with a traditional ultrahigh pressure grease injecting joint, the ultrahigh pressure grease injecting joint has the advantages that a nonmetal sealing piece is eliminated, and therefore sealing performance under extreme temperature is ensured. Meanwhile, tight locking force of sealing of a locking cone surface is changed, and the condition of seizure of the contacted face is avoided.

Description

A kind of ultrahigh pressure greasing joint

Technical field

The utility model relates to the pipeline valve field, relates in particular to the petroleum pipeline valve field, is specially a kind of ultrahigh pressure greasing joint.

Background technique

In API6D and API6A(API, American Petroleum Institute) in the valve field, the greasing joint is an indispensable vitals, it not only will have the ability of anti-H 2 S, carbon dioxide corrosion, but also the ability of bearing high pressure (fluid pressure or gas pressure) will be arranged, and also to pay selecting for use of material and close API6A and NACE(National Association of Corrosion Engineers (NACE)) requirement of MR0175.

The major function of greasing joint has three:

1. the pressure by greasing joint Drainage valve inner chamber;

2. by the greasing joint external agency is injected into valve cavity;

3. the greasing joint originally wants absolute one-way sealing (to its essence is and serve as one-way valve: applying under certain pressure in bearing under the valve cavity pressure status, medium flows into from an end of greasing joint, can flow out smoothly from the other end of greasing joint, on the contrary then can not).

The working pressure that present greasing joint bears can be divided into two kinds: the following greasing joint of 10000Psi and the above greasing joint of 15000Psi, use to adapt to the different valves that require.

For being used for the greasing joint of the following linkage structure of 10000Psi, as shown in Figure 1, its internal structure is simple: by valve body 2, bonnet 1, steel ball 3, spring seat 4, spring 5 totally five parts form, this kind joint generally adopts the LP1/2 line pipe thread with being connected of valve gap, and this greasing joint relies on the realization of LP1/2 pipeline screw thread and is aided with the PTFE sealing strip to strengthen sealing with the sealing that is connected of valve gap.According to the regulation of API6A, the maximum normal working pressure of LP1/2 line pipe thread can only be used for can not being used for the ultrahigh pressure occasion below the 10000Psi.

For the greasing joint of the above linkage structure of 15000Psi, as shown in Figure 2, its internal structure is then complicated: by valve body 12, bonnet 11, steel ball 13, spring seat 14, spring 15, back-up ring 16, Sealing 17, air supported head 18 totally 8 parts form, because its volume is big, as adopting 718 manufacturings such as material such as grade, cost will be very high; 1 1/8-12UNF unified fine thread made in U.S.A is generally adopted in being connected of this kind joint and valve gap, and by the conical surface realization of greasing joint end and the sealing that is connected of valve valve gap.According to the regulation of API6A, the working pressure of 1 1/8-12UNF unified fine thread made in U.S.A is greater than more than the 15000Psi; But owing to there is nonmetal Sealing, this kind greasing joint can not use in the ambient temperature occasion below-46 ℃.

Summary of the invention

The purpose of this utility model is, provides that a kind of suitable pressure, ambient temperature are extensive, simple in structure, good airproof performance, ultrahigh pressure greasing joint easy to use.

In order to achieve the above object, the utility model is achieved in that

A kind of ultrahigh pressure greasing joint, it comprises bonnet, valve body, is located at block bead and Returnning spring in the valve body; Valve body comprises the parent of offering through hole and is located in the parent through hole the axially spool of activity; The two ends outer surface of parent is provided with two sections screw threads, and an end is tightly connected by one section screw thread and bonnet; Spool is positioned at bonnet one side and is provided with snap ring, and the other end of spool is provided with conical boss, and spool is restricted in the through hole of parent by conical boss and snap ring; Valve core inside is provided with ladder hole, and this ladder hole is positioned at the aperture of bonnet one side less than the aperture that is positioned at conical boss one side, and the macropore that block bead and Returnning spring are located at this ladder hole is interior unidirectional logical to realize; Bonnet inside is provided with boss, and bonnet contacts with the aperture sealing of valve core inside ladder hole by boss.

Described ultrahigh pressure greasing joint, two sections screw threads being located at the parent outer surface are respectively 7/8-14UNF-2A screw thread and 1-14UNF-2A screw thread, and parent is tightly connected by 1-14UNF-2A screw thread and bonnet.

The utility model adopts the said structure design, and it is compared traditional ultrahigh pressure greasing joint and has abandoned nonmetal Sealing, thereby has guaranteed the sealability under the extreme temperature.Simultaneously, change the coupling mechanism force of locking conical surface seal, the situation of having avoided surface of contact to kill takes place.

Description of drawings

Fig. 1 is the structural representation of LP1/2 pipeline screw thread greasing joint.

Fig. 2 is the structural representation of 1 1/8-12UNF unified fine thread greasing joint made in U.S.A.

Fig. 3 is structural representation of the present utility model.

Fig. 4 is that the utility model is connected with target device, the structural representation when installing.

Fig. 5 is the utility model pressure release view.

Embodiment

Below further specify the utility model by specific embodiment.

As shown in Figure 3, a kind of ultrahigh pressure greasing joint, it comprises bonnet 21, valve body, is located at block bead 25 and Returnning spring 26 in the valve body; Valve body comprises the parent 23 of offering through hole and is located in parent 23 through holes axially spool 24 of activity; The two ends outer surface of parent 23 is provided with 7/8-14UNF-2A and two sections screw threads 28 of 1-14UNF-2A, 27, and bonnet 21 is tightly connected by 1-14UNF-2A screw thread 27 and parent 23; As shown in Figure 4, parent 23 is tightly connected by the valve gap 31 of 7/8-14UNF-2A screw thread 28 with target device.Spool 24 is positioned at bonnet 21 1 sides and is provided with steel snap ring 22, and the other end of spool 24 is provided with conical boss, and spool 24 is restricted in the through hole of parent 23 by conical boss and steel snap ring 22; Spool 24 inside are provided with ladder hole, and this ladder hole is positioned at the aperture of bonnet 21 1 sides less than the aperture that is positioned at conical boss one side, and the macropore that block bead 25 and Returnning spring 26 are located at this ladder hole is interior unidirectional logical to realize; Bonnet 21 inside are provided with boss, and bonnet 21 contacts with the aperture sealing of spool 24 inner step through holes by boss.

Design and the operating principle of this ultrahigh pressure greasing joint are as follows:

As shown in Figure 4, parent 23 is splits with spool 24, when screwing bonnet 21 and be connected with the valve gap 31 of target device, promote spool 24 indirectly and move, between the sealing cone 32 of the conical surface 29 of the conical boss of final spool 24 and the valve gap 31 of target device by pushing the formation physical seal; Because the motion between the conical surface and the conical surface is straight line motion, rather than rotatablely move, therefore not only improved the reliability of sealing, also avoided having under the situation of impurity between the conical surface and the conical surface, relative rotary motion and by the possibility of being killed, thereby the working life of having improved the greasing joint.

Also there is following advantage in the traditional relatively greasing joint of this ultrahigh pressure greasing joint:

One, as shown in Figure 5, do not need special tool to join when the bleeder valve body intracavity pressure, when the needs pressure release, make it to become flexible a little as long as be rotated counterclockwise parent 23, the valve body cavity pressure will be discharged along the gap, has simplified programmed sequence of operations greatly.

Two, relatively its internal structure is simpler, volume is small and exquisite with traditional ultrahigh pressure greasing joint, and be more convenient for manufacturing and assembling and cost are the end of than.

Three, this greasing joint does not use nonmetal Sealing, and rubber seal especially is so this greasing joint can be used to low temperature environment below-46 ℃.

Four, adopt 7/8-14UNF-2A unified screw thread made in U.S.A with being connected of the valve gap of target device, connection speed is faster, being reduced to bottom line downtime.

Five, and the sealing between the equipment valve gap be to realize intermetallic being tightly connected by the conical surface of spool end, do not need to add any other auxiliary sealing material during installation, it is safer, more reliable to work, and ultrahigh pressure greasing joint can be used to harsher corrosion working condition.

Six, under pressure reduction or fluctuation situation, can not influence the quality of sealing; Especially pressured state lower seal performance is better.

Seven, this greasing joint can be selected multiple material manufacturings such as carbon steel, low alloy steel, stainless steel and corrosion-resistant material for use, thereby can be applied to the field of wider model.

Claims

1. ultrahigh pressure greasing joint, it comprises bonnet, valve body, is located at block bead and Returnning spring in the valve body; It is characterized in that: valve body comprises the parent of offering through hole and is located in the parent through hole the axially spool of activity; The two ends outer surface of parent is provided with two sections screw threads, and an end is tightly connected by one section screw thread and bonnet; Spool is positioned at bonnet one side and is provided with snap ring, and the other end of spool is provided with conical boss, and spool is restricted in the through hole of parent by conical boss and snap ring; Valve core inside is provided with ladder hole, and this ladder hole is positioned at the aperture of bonnet one side less than the aperture that is positioned at conical boss one side, and the macropore that block bead and Returnning spring are located at this ladder hole is interior unidirectional logical to realize; Bonnet inside is provided with boss, and bonnet contacts with the aperture sealing of valve core inside ladder hole by boss.

2. ultrahigh pressure greasing joint according to claim 1, it is characterized in that: two sections screw threads being located at the parent outer surface are respectively 7/8-14UNF-2A screw thread and 1-14UNF-2A screw thread, and parent is tightly connected by 1-14UNF-2A screw thread and bonnet.