CN202176751U

CN202176751U - Valve seat sealing mechanism

Info

Publication number: CN202176751U
Application number: CN2011202653409U
Authority: CN
Inventors: 李仲光; 蔡守连; 杨卫东
Original assignee: Shanghai Neles Jamesbury Valve Co Ltd
Current assignee: Shanghai Neles Jamesbury Valve Co Ltd
Priority date: 2011-07-25
Filing date: 2011-07-25
Publication date: 2012-03-28
Anticipated expiration: 2021-07-25

Abstract

The utility model discloses a valve seat sealing mechanism, comprising a valve seat, a spring, a sealing ring and a retaining ring, wherein the valve seat is contacted with a valve ball, a first groove and a second groove are opened on a contact surface of the valve seat and the valve ball and the first groove is adjacent to the second groove. The spring is connected with the valve seat and the valve seat is pushed by the spring to cling to the valve ball. The sealing ring is mounted in the first groove and contacted with the surface of the valve ball. The retaining ring is mounted in the second groove and used for fixing the sealing ring in the first groove. The features of the carbon graphite material are completely used by the valve seat sealing mechanism, the good sealing performance is kept and simultaneously the torsional moment of the valve is reduced and it is predicated that 10-15% of the valve torsional moment value is reduced.

Description

Valve base sealing mechanism

Technical field

The utility model relates to valve part, relates in particular to a kind of valve base sealing mechanism.

Background technique

Along with the manufacturing continuous development of valve, the valve seal material has obtained continuous exploitation and perfect.See that from the seal form of valve sealing and external sealed in valve seal can be divided into according to the difference of sealing station, can be divided into valve stem seal, valve base sealing and valve bonnet seal.

Many new sealing materials have progressively used in the valve seal product.For sealing material, the structure of sealing also can be different, to adapt to the characteristic of sealing material in this.

Such as for the up-to-date carbon graphite material that is used to seal, carbon graphite is a kind of solid lubricant with self lubricity, have high temperature resistant, anti-oxidant, thermal expansion coefficient is little, friction factor is low, density is little, the good characteristics of wear resistance and workability.Carbon graphite is adapted at high speed, high pressure or low-speed heave-load, dry friction working condition or work under water, oil, ammonia, propane, acid, alkali, salt medium.Carbon graphite possesses good sealing material attribute, if can cooperate with suitable sealing configuration, can effectively improve the lift-off seal effect.

The model utility content

The utility model is intended to propose a kind of valve base sealing mechanism that is suitable for carbon graphite material.

According to an embodiment of the utility model, a kind of valve base sealing mechanism is proposed, comprise valve seat, spring, seal ring and back-up ring.

Valve seat contacts with valve ball, valve seat with the surface of contact of valve ball on have first groove and second groove, first groove is adjacent with second groove.Spring is connected to valve seat, and spring promotes valve seat and hugs valve ball.Seal ring is installed in first groove, and seal ring contacts with the surface of valve ball.Back-up ring is installed in second groove, and back-up ring is fixed on seal ring in first groove.

In one embodiment, seal ring is carbon graphite material and is triangle that first groove also is a triangle.

In one embodiment, the length of back-up ring is greater than the degree of depth of second groove, and the end face of first end of back-up ring is that the end face of plane, second end is inclined-plane or arc shaped surface, and first end of back-up ring stretches in second groove.Back-up ring contacts with seal ring, and back-up ring is pressed on seal ring in first groove.

In one embodiment, have urgent seal groove on the valve seat, urgent seal groove be communicated to valve seat with the surface of contact of valve ball.Can pour into seal gease in the urgent seal groove.

The valve base sealing mechanism of the utility model has made full use of the characteristic of carbon graphite material, can when keeping good sealing property, reduce valve torque, and expectation can reduce valve torque value 10%-15%.

Description of drawings

Fig. 1 has disclosed the structural drawing according to an embodiment's of the utility model valve base sealing mechanism.

Embodiment

With reference to shown in Figure 1, the utility model has disclosed a kind of valve base sealing mechanism, and this valve base sealing mechanism comprises valve seat 102, spring 101, seal ring 104 and back-up ring 103.

Valve seat 102 contacts with valve ball 106, valve seat 102 with the surface of contact of valve ball 106 on to have first groove 120 adjacent with second groove 121 with second groove, 121, the first grooves 120.Spring 101 is connected to valve seat 102, and spring 101 promotes valve seat 102 and hugs valve ball 106.Seal ring 104 is installed in first groove 120, and seal ring 104 contacts with the surface of valve ball 106.With reference to embodiment shown in Figure 1, seal ring 104 is made by carbon graphite material, and triangular in shape.Match, first groove 120 is also triangular in shape, makes seal ring 104 to be fixed on well in first groove 120.Seal ring 104 is designed to the seal pressure that triangle can guarantee that valve is required, and has improved the adaptive ability of sealing material.Back-up ring 103 is installed in second groove 121, and back-up ring 103 is fixed on seal ring 104 in first groove 120.With reference to embodiment shown in Figure 1; The length of back-up ring 103 is greater than the degree of depth of second groove 121; The end face of first end of back-up ring 103 is that the end face of plane, second end is inclined-plane or arc shaped surface; First end of back-up ring 103 stretches in second groove, second end towards valve seat 102 with the surface of contact of valve ball 106, the end face of second end is that inclined-plane or arc shaped surface are to be suitable for the shape of valve ball surface of contact.Back-up ring 103 contacts with seal ring 104, and back-up ring 103 is pressed on seal ring 104 in first groove 120.Continuation is with reference to figure 1, and 102 also have urgent seal groove 105 on valve seat, urgent seal groove 105 be communicated to valve seat 102 with the surface of contact of valve ball 106.Can pour into seal gease in the urgent seal groove 105.The effect of urgent seal groove 105 is, when situation that leaking appears in seal ring 104 for a certain reason, can inject seal geases through urgent seal groove 105, rebulids the security of operation that seals with the assurance valve by the effect of line pressure.

Claims

1. a valve base sealing mechanism is characterized in that, comprising:

Valve seat, valve seat contacts with valve ball, said valve seat with the surface of contact of valve ball on have first groove and second groove, first groove is adjacent with second groove;

Spring is connected to valve seat, and spring promotes valve seat and hugs valve ball;

Seal ring is installed in said first groove, and said seal ring contacts with the surface of valve ball;

Back-up ring is installed in second groove, and said back-up ring is fixed on seal ring in first groove.

2. valve base sealing as claimed in claim 1 mechanism is characterized in that,

Said seal ring is a triangle, and said first groove also is a triangle.

3. valve base sealing as claimed in claim 2 mechanism is characterized in that,

Said seal ring is that carbon graphite material is made.

4. valve base sealing as claimed in claim 1 mechanism is characterized in that,

The length of said back-up ring is greater than the degree of depth of second groove, and the end face of first end of back-up ring is that the end face of plane, second end is inclined-plane or arc shaped surface, and first end of back-up ring stretches in second groove.

5. valve base sealing as claimed in claim 4 mechanism is characterized in that,

Said back-up ring contacts with seal ring, and back-up ring is pressed on seal ring in first groove.

6. valve base sealing as claimed in claim 1 mechanism is characterized in that,

Have urgent seal groove on the said valve seat, urgent seal groove be communicated to valve seat with the surface of contact of valve ball.

7. valve base sealing as claimed in claim 6 mechanism is characterized in that,

Perfusion seal gease in the said urgent seal groove.