CN201909043U

CN201909043U - High-temperature and high-pressure butterfly valve of bidirectional-flow and self-seal elastic valve seat

Info

Publication number: CN201909043U
Application number: CN201020656779XU
Authority: CN
Inventors: 戴学祥; 陈贤良; 王爵义; 王燊; 王克志; 王靖胜
Original assignee: Zhejiang Zhenghua Valve Factory
Current assignee: Zhejiang Zhenghua Valve Factory
Priority date: 2010-12-03
Filing date: 2010-12-03
Publication date: 2011-07-27
Anticipated expiration: 2020-12-03

Abstract

The utility model provides a high-temperature and high-pressure butterfly valve of a bidirectional-flow and self-seal elastic valve seat. The butterfly valve is characterized in that the inner wall of a valve body is provided with a power ring and a seal seat, the power ring is matched with the seal seat, the valve seat is pushed onto a seal surface of a butterfly board under the condition of a reverse pressure, the seal surface of the butterfly board is spherical, the part of the valve seat which is designed at the end of a flow way can not be restrained by a plurality of adjoining parts due to the design of the intercrossed center between a flow path of the valve body and a valve shaft, the pressure of a medium is acted onto the A and the B of a sleeve when the valve seat is reversely pressed, so that a seal end of the valve seat is acted onto the spherical surface of the butterfly board in a progressive way to be tightly fit with the seal surface on the butterfly board to be sealed, the middle of the valve seat is provided with a R groove, an annual plane which is extended along with the direction from the groove to the flow path and a contact, and a gap is remained between two parts of the seal seat matched with the power ring, so that the micro bending of the butterfly board can be preferably retired on the valve body under the status that the inverse pressure is near to the seal surface of the butterfly board, or the butterfly valve can be telescopic caused by the material deformation when the butterfly valve is under high temperature.

Description

Bidirectional flow selfsealings elastic seat High Temperature High Pressure butterfly valve

Technical field

The invention belongs to universal machine and be used for the high butterfly valve of popularity rate on the fluid means.

Background technique

Common butterfly valve is with simple in structure, only form by a few parts, material consumption is economized, volume is little, in light weight, easy and simple to handle, only need half-twist to get final product fast opening and closing, and have good flow regulating function simultaneously and close sealing characteristics, on general industries such as the oil of big medium caliber, mesolow power, coal gas, chemical industry, water treatment, be used widely.

Butterfly valve has two kinds of seals style of sealing of bullet sealing and metal

1, elastic packing butterfly valve: seal ring can be embedded on the butterfly plate periphery generally based on rubber, because of sealing material is subjected to the defective of temperature limitation, can only use at normal temperatures.

2, metallic sealing butterfly valve: valve seat and seal ring are made by metal, but at present the most frequently used this kind seal ring adds the form of graphite interlayer, just soft scleroma zoarium with multiple layer metal.

Butterfly valve with metallic seal is generally long than the life of valve of elastic packing, metallic seal can adapt to higher operating temperature, but the very big shortcoming of this butterfly valve usually can only unmarried pressurized, because of the counter fluid poor ability that butterfly plate bore, butterfly plate and valve shaft are sufficiently large, but this is worthless, too big volume can influence flow velocity by blocking pipe, also be uneconomic, so flow direction can only single current, have the facility of two-way requirement generally not to be used, this further expands application area and installs and uses just for butterfly valve and brings adverse factors.

In addition, no matter above-mentioned valve is single eccentric two off-centre or three eccentric butterfly valve all is to come switch valve with torsion, especially metallic sealing butterfly valve, there are the higher friction wearing and tearing in its torsion to sealing surface, in addition for three eccentric butterfly valve, the reason that can not bear High Temperature High Pressure is that it is that stacked seal ring is that the combination of soft or hard (a kind of steel add graphite or asbestos glued joint form) holds front that can't stand high-temperature, high pressure fluid and washes away, and the method that overcomes above-mentioned deficiency is to the innovation in the butterfly valve design, is the disclosed summary of relevant up-to-date several butterfly valve technological inventions below.

CN1329221A discloses a kind of low torque butterfly valve, establish the relatively straight trough of valve rod center line of a skewed slot and in the valve rod lower end, the outside, valve rod lower end is provided with sliding york, and valve rod passes between two sliding yorks, and be connected with sliding york by slotted eye, locating stud, sliding york one end is connected with butterfly valve.

CN100520132C has proposed a kind of non-abrasion hard-sealing butterfly valve, the valve rod upper and lower end all has curvilinear groove, curvilinear groove has skewed slot and arc groove to constitute respectively up and down, the valve rod middle part also has long keyway, be connected in respectively on the feather key up and down of lower connecting base, push rod comprises lower push-rod, and the one end is all installed roller, lower push-rod one end is embedded in the lower curve groove, and slidably.

Briefly, above-mentioned two invention all combines formation by straight pin and is slidingly connected and transferring power with other member.The present technique field personnel know, the characteristics of butterfly valve are to be fit to bigger line size, in the variation of butterfly valve bore, total load is little on the different unit areas often has to several tons big pressure to tens up to a hundred tons, yet big moment loading is unfavorable in the contact of straight pin line on the edge of institute's mating groove, consequently: once or switch motion several times just be enough to form impression, and this impression is difficult to revise, further strengthen the trend of intensification along with the increase meeting of valve opening and closing number of times, finally can influence the safety of equipment or the reduction in valve working life, outside it, complicated mechanism's meaning not the increase of cost, also can make and safeguard the difficulty that becomes.

Summary of the invention

The object of the invention is to provide a kind of easy to process Yu more cheap bidirectional flow selfsealings elastic seat High Temperature High Pressure butterfly valve (hereinafter to be referred as butterfly valve), and gives its stable sealability by the pressure of itself in the pipeline, also can reduce the torque that butterfly valve opens and closes.

According to embodiments of the invention, butterfly valve has butterfly plate and valve shaft, is provided with dynamic ring and sealing seat on inwall on the fluid passage of valve body one side, and the bi-side that valve seat is not held contact and form sealing with valve body with the sealing seat step respectively.

The outstanding big end cylindrical of dynamic ring contacts with the interior round step hole of sealing seat, under the situation of backpressure down to there being enough abilities that valve seat is pushed on the sealing surface of butterfly plate.Socket head screw is connected with respective threads formation on the valve body circumference by the hole that sealing seat circumferencial direction etc. all distributes.

Valve seat is the above stainless steel materials manufacturings of 304 trades mark, middle part one side has annular slot, the designed depth of groove gets the small value with the increase of pressure and temperature, otherwise pressure and temperature reduce to get big value, size should be obtained according to the design-calculated gross data more specifically, preferably, under different pressure and temperature, improve operability and reliability to adapt to by the mensuration of finite element software.

The sealing surface of butterfly plate is spherical, runner and the crossing center design of valve shaft with valve body, to such an extent as to can both contacting and seal be arranged with valve seat near any point of contact that opens and closes the position, according to the different demand of flowing medium, corrosion resistant CR13 stainless steel of the sealing surface of butterfly plate built-up welding on its side face or harder alloy-layer.

The hermetic terminal of valve seat can be the spherical with the consistent cooperation of butterfly plate sealing surface, also has the form of the conical surface close with the spherical of butterfly plate, also be not limited only to this, can also be other such as the R arc round angle form (not shown) that is a protrusion.

For butterfly valve uses under High Temperature High Pressure, generally seat design is retrained by adjacent part connecing not allowed by the part of the interior circle of nearly runner end, only when reverse pressurized on the A and B of pressure action of medium in the space, and the Zhou Yuan that is pressed on the valve seat head makes it to be held back in backward on the annular side of valve body step, on the gradual sphere that acts on butterfly plate of the sealed end of valve seat point from the low spot to the height, the sealing surface on formation and the butterfly plate fits tightly the situation that forms sealing mutually thus.

The middle part of valve seat one side has ring-type R groove, the planar annular that extends to the runner direction along groove with contact, set up circular groove separately in the bottom that the opposite side of valve seat contacts with valve body, and leave the gap between two parts of the sealing seat that matches of dynamic ring, to help can allowing under the close situation of butterfly plate sealing surface the crooked yielding of its trace on the valve body or perhaps the butterfly valve condition that caused material deformation stretches when being in high temperature at reverse pressurized.

Valve shaft extends outside the jointing usually, is its driving thereby connect valve actuator.

Effect of the present invention and effect are as follows

1. valve seat is tabular loop configuration, and the design of split assembling type can for convenience detach and maintenance.

2. can accept bidirectional fluid pressure, not be subjected to the influence of mounting point.

3. the full-metallic elastic seat can not be stuck when bearing High Temperature High Pressure.

4. but to make moment of torsion alleviate operation more convenient for the deformability of elastic seat when opening and closing butterfly valve.

Of the present invention these are described in detail by following accompanying drawing.

Fig. 1 is the partial section of bidirectional flow selfsealings elastic seat High Temperature High Pressure butterfly valve of the present invention.

Fig. 2 be bidirectional flow selfsealings elastic seat High Temperature High Pressure butterfly valve of the present invention with partial enlarged drawing.

Fig. 3 is a bidirectional flow selfsealings elastic seat High Temperature High Pressure butterfly valve sectional view of the present invention.

Illustrating main piece mark is: 1, valve body 2, butterfly plate 3, valve seat 4, dynamic ring 5, sealing seat 6, socket head screw 7, valve shaft 8, reverse runner 9, forward runner.

According to embodiments of the invention, butterfly valve is provided with in the runner of valve body (1) on the inwall of fluid passage of butterfly plate (2) and valve shaft (7), a side and is provided with dynamic ring (4) and sealing seat (5), a side (3-3) of valve seat (3) end, (3-2) respectively with valve body (1) on step (1-1) and the step (5-3) of sealing seat (5) contact and form sealing.

The big end cylindrical (4-1) that dynamic ring (4) is outstanding and interior circle (5-2) step hole of sealing seat (5) are Spielpassung, counter fluid pressure by (A) and space situation (B) under so that enough ability is arranged pushing on the sealing surface (2-2) of butterfly plate by a side ring shape plane (3-4) of valve seat (3), the state that the hole that socket head screw (6) all distributes by sealing seat (5) circumferencial direction etc. is connected with respective threads (1-2) formation on the valve body circumference.

The middle part of valve seat (3) one sides (3-3) has ring-type R groove (3-1), the planar annular (3-4) that extends to runner (8) direction along groove contacts with the end face (4-2) on the dynamic ring (4), in the valve body (1) of the opposite side of valve seat (3), establish circular groove (H-B), and leave gap (H-A) between two parts of the sealing seat (5) that matches of dynamic ring (4).

The sealing surface of butterfly plate (2) is spherical (2-1), runner and the crossing center design of valve shaft (7) with valve body (1), to such an extent as to can both contacting and seal corrosion resistant CR13 stainless steel of built-up welding or harder alloy-layer on the spherical circumferential surface of sealing surface (2-2) of butterfly plate (2) be arranged with valve seat (3) near any point of contact that opens and closes the position.

Sealed end (3-5) portion of valve seat (3) can be the spherical with the consistent cooperation of butterfly plate sealing surface (2-1), the form that also has the conical surface close with the spherical of butterfly plate (2), also be not limited only to this, can also be other such as the R arc round angle form that is a protrusion.

The present invention describes with reference to preferred embodiment, undoubtedly, can carry out many-side without departing from the present invention for the those skilled in the art who reads and understand this specification and carry out improvement or carry out more Variant Design, some features of bidirectional flow selfsealings elastic seat High Temperature High Pressure butterfly valve of the present invention then have in the appended claims to be limited.

Claims

1. bidirectional flow selfsealings elastic seat High Temperature High Pressure butterfly valve, its main feature is: the butterfly plate of butterfly valve is with the runner and the crossing center design of valve shaft (7) of valve body (1), the inwall of the fluid passage of one side is provided with dynamic ring (4) and sealing seat (5), the terminal side (3-3) of valve seat (3), (3-2) respectively with valve body (1) on step (1-1) and the step (5-3) of sealing seat (5) contact and form sealing.

2. bidirectional flow selfsealings elastic seat High Temperature High Pressure butterfly valve according to claim 1, it is characterized in that: the big end cylindrical (4-1) that dynamic ring (4) is outstanding and interior circle (5-2) step hole of sealing seat (5) are Spielpassung, at counter fluid pressure one side ring shape plane (3-4) of valve seat (3) is pushed on the sealing surface (2-2) of butterfly plate, socket head screw (6) is connected with respective threads (1-2) on the valve body circumference by the hole that sealing seat (5) circumferencial direction etc. all distributes.

3. bidirectional flow selfsealings elastic seat High Temperature High Pressure butterfly valve according to claim 1, it is characterized in that: the middle part of valve seat (3) one sides (3-3) has ring-type R groove (3-1), the planar annular (3-4) that extends to runner (8) direction along groove contacts with the end face (4-2) on the dynamic ring (4), in the valve body (1) of the opposite side of valve seat (3), establish circular groove (H-B), and leave gap (H-A) between two parts of the sealing seat (5) that matches of dynamic ring (4).