CN201014032Y

CN201014032Y - Filler ring structure of regulation valve and regulation valve having same

Info

Publication number: CN201014032Y
Application number: CNU2006200493387U
Authority: CN
Inventors: ***
Original assignee: Individual
Current assignee: JIANGNAN VALVE CO Ltd
Priority date: 2006-12-21
Filing date: 2006-12-21
Publication date: 2008-01-30
Anticipated expiration: 2016-12-21

Abstract

The utility model relates to a stuff ring structure of a regulating valve. The stuff ring structure of the regulating valve is a stuff ring body with a reverse V-shaped section, comprising an upper ring surface groove and a lower ring surface groove, and the lower ring surface groove forms two wings of a stuff layer structure. The utility model is characterized in that: the top part of the lower ring surface groove forms a notch; the stuff ring structure can ensure good sealing of a valve rod and the stuff in continuously changing condition. The utility model further relates to a regulating valve with the stuff ring, thus ensuring good sealing of a valve rod and the stuff in continuously changing condition, thereby the regulating can run safely.

Description

Filler ring structure of regulating valve and regulating valve with filler ring

Technical Field

The utility model relates to a governing valve specifically relates to have the packing ring structure of governing valve and have the governing valve of this packing ring.

Background

In a control system with high automation degree, a regulating valve is usually used as a terminal execution device of an automatic regulating system, receives a control signal, changes a resistance system of the valve by changing the stroke of a valve core according to the direction and the size required by the control signal, and achieves the aim of regulating the flow, and the action sensitivity of the regulating valve is directly related to the quality of the regulating system.

A typical regulator valve consists of an actuator part and a valve part. The valve portion is typically formed of a valve body, an upper bonnet, an inner bonnet assembly, a stuffing box assembly, and the like. The sealing part of the regulating valve is generally composed of a seal between an upper valve cover and a valve body, a seal between the valve body and a pipeline and a seal between a stuffing box and a valve rod, the seals between the upper valve cover and the valve body and between the valve body and the pipeline belong to static seals, the seal between the stuffing and the valve rod belongs to dynamic seals, and the valve rod and the stuffing have relative motion, so that the valve action sensitivity is ensured, and meanwhile, the sealing performance at the position is required to be ensured. The stuffing is arranged in the stuffing box hole of the upper valve cover, and axial pressure is applied to the stuffing box hole through the gland. Due to the plasticity of the filler, the filler generates radial force and is tightly contacted with the valve rod, so that the medium is prevented from leaking from the valve rod, and the sealing effect is achieved. The material of the filler can be Polytetrafluoroethylene (PTFE), graphite and the like according to different temperatures, pressures and media. However, the contact of the valve stem with the packing is often not very uniform, with some parts in loose contact, some parts in tight contact, and even some parts without contact. In the use process of the regulating valve, the stuffing box of the regulating valve is also a part with more leakage phenomena under the influence of high temperature, high pressure and strong permeability fluid medium.

A conventional inverted V-shaped packing ring structure is shown in figure 2, and the top of the groove below the packing ring is only made into a small r-shaped round angle, so that the thickness of the packing material between the top of the upper surface of the ring and the top of the groove below the ring is increased, and the outward expansion elasticity of the two wings of the V-shaped packing is weakened. In addition, due to the reason of processing errors, the small r fillet is inaccurate in size, the local top-up phenomenon of the upper and lower layer fillers often occurs, and the deformation effect of outward expansion of the two wings is less. The angles of the top of the upper ring and the groove of the lower ring of the traditional inverted V-shaped packing are larger, so that the traditional inverted V-shaped packing is not beneficial to the expansion stress of the two wings.

SUMMERY OF THE UTILITY MODEL

In view of the above-mentioned defect of the prior art, the utility model aims at providing a filler ring structure of governing valve, this filler ring structure can guarantee that the sealing of valve rod and filler is good under the constantly changeable operating condition.

The utility model also has an object to provide a governing valve, the packing ring structure wherein can guarantee that the sealing of valve rod and filler is good under the operating condition who constantly changes to make governing valve can the safe operation.

On the one hand, according to the utility model discloses, the packing ring structure of this kind of governing valve is a cross-section and is an inverted V-arrangement packing ring body, including ring top and ring below groove, ring below groove forms the both wings of packing ring structure, its characterized in that, the top in ring below groove is formed with a breach.

Preferably, the notch at the top of the groove below the ring is in an inverted U shape.

Preferably, the notch at the top of the groove below the ring is square.

Preferably, the notch at the top of the groove on the lower surface of the ring is semicircular.

Preferably, the angle of the top of the ring upper face is 90 degrees.

Preferably, the opening angle of the lower groove is 80 degrees.

Preferably, the material of the inverted V-shaped packing ring is polytetrafluoroethylene.

On the other hand, according to the utility model provides a regulating valve, including actuating mechanism and valve part, the valve part comprises valve body, upper valve gap, the interior subassembly including the valve rod and filler ring structure, the filler ring structure is located in the stuffing box hole of upper valve gap and with the valve rod contact of interior subassembly, the filler ring structure includes that a cross-section is the shape of falling V filler ring body, has the ring face and the ring face groove below, and the ring face becomes the both wings of filler ring structure below the ring, its characterized in that, the top in ring face groove is formed with a breach.

Compare with traditional shape of falling V packing ring, because of the utility model discloses be formed with a breach at the top in the groove under the ring, reduced the top above the packing ring and the material thickness between the top in the groove under the ring, improved local elasticity, be favorable to packing ring structure two wings to expand to warp. Simultaneously, because the existence of the top breach in groove under the ring, and make the utility model discloses pack and do not have the little r fillet that traditional packed, avoid causing the local dead phenomenon in upper and lower face of packing because of machining error.

On the other hand, the utility model discloses a governing valve is owing to have as above the drilled packing ring, and also can realize the valve rod well with the sealed of packing under the operating condition of continuous change to make governing valve safe operation.

Drawings

FIG. 1 is a schematic illustration of a packing installed in a regulator valve;

FIG. 2 is a cross-sectional view of a conventional packing ring;

FIG. 3 is a cross-sectional view of the packing ring of the present invention;

fig. 4 is a force analysis diagram of the packing ring shown in fig. 3.

Detailed Description

The regulating valve is an actuator in an automatic control system, and the action sensitivity and the sealing performance of the regulating valve are directly related to the quality of the control system. As shown in fig. 1, the seal between the valve stem and the packing is a dynamic seal, and because there is relative motion between the valve stem and the packing, the seal is crucial to the sealing performance of the regulator valve. The packing is mounted in a stuffing box bore 3 of the upper bonnet 2 and is axially compressed by a gland 4.

As shown in fig. 3, the packing of the present invention is an inverted V-shaped packing ring structure, which comprises an inverted V-shaped packing ring body 1 having an upper ring surface 11 and a lower ring surface 12, the lower ring surface forming two

wings

121 and 122 of the packing ring structure; a notch 123 is formed at the top a of the groove below the ring. In the present embodiment, the shape of the notch 123 is an inverted U-shape, but those skilled in the art will appreciate that other shapes that can form the notch are also feasible, such as a square shape, a semicircular shape, etc.

As further shown in FIG. 3, the top angle of the upper ring surface is 90 degrees, the top angle of the lower ring surface groove is 80 degrees, and the angles of the conventional packing ring are 100 degrees and 90 degrees, respectively. As shown in FIG. 4, it can be found that

The force f2 is just the sealing force between the packing ring and the valve rod and between the packing ring and the stuffing box hole, and f1 is the packing ring

Axial force applied to the packing ring. In the case where f1 is constant, f2 increases as the angle θ decreases. In other words, after the angle of the inverted V-shaped packing is reduced, under the condition of the same pressing force, the inverted V-shaped packing ring with a small angle can obtain larger radial sealing specific pressure, so that the inner diameter and the outer diameter of the packing can obtain more reliable sealing.

Meanwhile, the gaps at the top of the lower ring groove increase the elasticity of two wings of the packing ring, and the energy storage spring has the function. In the dynamic process of the up-and-down motion of the valve rod, the inner wall of the inverted V-shaped packing ring is in good contact with the valve rod all the time, and the outer wall of the inverted V-shaped packing ring presses the inner wall of the packing box hole better, so that the reliable sealing of the packing ring position is ensured.

The utility model discloses still include the governing valve as shown in figure 1, this governing valve has as before the filler ring, consequently also can realize the valve rod well with the sealed of packing under the constantly changeable operating condition to make governing valve safe operation

Claims

1. The packing ring structure of the regulating valve comprises a packing ring body with an inverted V-shaped section, wherein the packing ring body is provided with an upper ring surface groove and a lower ring surface groove, and the lower ring surface groove forms two wings of the packing ring structure.

2. The packing ring structure for a regulator valve of claim 1 wherein the gap at the top of the groove below said ring is inverted U-shaped.

3. The packing ring structure for a regulator valve of claim 1 wherein the gap at the top of the groove below said ring is square.

4. The packing ring structure for a regulator valve of claim 1 wherein the gap at the top of the groove below said ring is semi-circular.

5. The packing ring structure for a regulator valve of claim 1 wherein the angle of the top of said ring is 90 degrees.

6. The packing ring structure for an adjustment valve of claim 1, wherein the opening angle of said lower groove is 80 degrees.

7. The packing ring structure for a regulator valve of claim 1 wherein the material of said inverted V-shaped packing ring is polytetrafluoroethylene.

8. A regulating valve comprising an actuator and a valve part, said valve part comprising a valve body, an upper bonnet, an inner valve component comprising a valve stem, and a packing ring structure, said packing ring structure being located in a packing gland of said upper bonnet and contacting said valve stem of said inner valve component, said packing ring structure comprising a packing ring body having an inverted V-shaped cross-section with an upper ring face and a lower ring face slot, said lower ring face slot forming two wings of said packing ring structure, characterized in that a notch is formed at the top of said lower ring face slot.