CN101663520A

CN101663520A - Slam shut safety device

Info

Publication number: CN101663520A
Application number: CN200880012543A
Authority: CN
Inventors: 克劳德·法伊拉特; 阿诺·布儒瓦; 纪尧姆·富尔内尔
Original assignee: Fisher Controls International LLC
Current assignee: Fisher Controls International LLC
Priority date: 2007-04-20
Filing date: 2008-04-18
Publication date: 2010-03-03
Anticipated expiration: 2028-04-18
Also published as: JP2014098544A; RU2012143380A; JP5791740B2; CN101663520B; RU2608846C2

Abstract

A safety device for a gas distribution system includes a valve body, an upper casing attached to the valve body, the upper casing housing two springs. The two springs are co-axially located and separated by a casting tube. Further, the two springs are attached to a movable diaphragm that is exposed to gas system pressure. A snap ring flange is also attached to the valve body, the snap ring flangebeing used to secure the safety device to a main regulator in the gas distribution system. The valve body also includes a cam mounted within the valve body. A limit switch is directly connected to thecam such that the limit switch moves directly in response to movement of the diaphragm. Additionally, a reset pin extends from the valve body and interacts with the cam such that the cam may be resetfrom a closed position to an open position by moving the reset pin.

Description

Slam shut safety device

Related application

The application requires in the rights and interests of the U.S. Provisional Application 60/925,599 of submission on April 20th, 2007, and its full content is incorporated this paper by reference into.The application requires in the foreign priority rights and interests of the french patent application FR0754624 of submission on April 20th, 2007, and its full content is incorporated this paper by reference into.

Technical field

Present disclosure relates generally to the safety installations that is used for gas distributing system, more specifically, relates to emergency cut-off (slam-shut) type safety valve.

Background technique

Gas distributing system, particularly natural gas distributing system are transported to Consumer along a series of pipelines and by a series of valves from the producer with gas usually.Each gas distributing system can comprise one or more modulating valve of the gas pressure in the control distribution system.Usually, gas under high pressure is transferred and passes through system.Yet gas pressure must be reduced before being finally allocated to the Consumer.This decompression is finished in the pressure-reducing station that is arranged in local network usually.

Usually, described pressure-reducing station certain safety installations of comprising one or more pressure regulator valves and when pressure regulator valve lost efficacy, cutting off air-flow.The most at large, slam-shut safety valve is used to above-mentioned purpose.For example, the U. S. Patent 4,134,421 that is incorporated into this by reference discloses a kind of slam-shut safety valve that overvoltage protection is provided in pipeline.This slam-shut safety valve roughly is arranged on the upstream of pressure regulator valve, makes that this Emergeny Cutoff Valves can prevent that gas from arriving pressure regulator valve under the situation that pressure regulator valve lost efficacy.Slam-shut safety valve is at the gas pressure in minimum and maximum pressure tolerance monitoring pressure regulator valve downstream.If downstream pressure surpasses the one of any of maximum or minimum tolerance, slam-shut safety valve is closed, and leads to the air-flow of pressure regulator valve and prevents that gas from leaking uncontrollably because of pressure regulator valve loses efficacy thereby cut off.

Summary of the invention

A kind of slam-shut safety valve that is used for gas distributing system comprises valve body, is connected to the last shell of described valve body, and the described shell of going up holds two springs.Described two coaxial settings of spring and separated by cast tube.Described two springs are connected to the movable barrier film that a side is exposed to gas system pressure.The snap ring flange is connected to described valve body, and described snap ring flange is suitable for described safety installations is fixed to master selector in the described gas distributing system.Described valve body comprises the cam that is installed in this valve body.Limit switch is directly connected to described cam, makes directly the moving and moving of the described barrier film of response of described limit switch.Return pin interacts from described valve body extension and with described cam, makes that described cam can reset to open position from closed position by moving described return pin.

Description of drawings

Purpose of the present invention, feature and advantage will become after reading specification in conjunction with the following drawings obviously, and described accompanying drawing comprises:

Fig. 1 is the perspective view according to the slam shut safety device of the teaching structure of present disclosure;

Fig. 2 is the cut away view of the last shell of the slam shut safety device shown in Fig. 1;

Fig. 3 A is arranged on the last shell of slam shut safety device of Fig. 1 and the sectional view of the barrier film between the valve body;

Fig. 3 B is the sectional view of barrier film of Fig. 3 A of low-pressure structure;

Fig. 3 C is the sectional view of barrier film of Fig. 3 A of high voltage structures;

Fig. 4 is the perspective view that is used for the slam-shut safety valve of Fig. 1 is fixed to the snap ring flange of main inlet control valve;

Fig. 5 A is the forward sight cut away view of valve body of the slam shut safety device of Fig. 1, and it highlights the return pin that is positioned at reset position especially; With

Fig. 5 B is the forward sight cut away view of valve body of the slam shut safety device of Fig. 1, and it highlights the return pin that is positioned at again latched position especially.

Embodiment

Referring now to accompanying drawing,, Fig. 1 example illustrates the slam shut safety device 10 according to the teaching structure of present disclosure.Particularly, this slam shut safety device 10 is connected to the master selector (not shown) in the gas distributing system.Slam shut safety device 10 comprises valve body 12, is connected to the last shell 14 of this valve body, is installed to snap ring flange 16, the limit switch 18 of a side of valve body 12 and the return pin 20 of stretching out from valve body.Slam shut safety device 10 is connected to the master selector (not shown) by fastening piece 22.Similarly, last shell 14 is connected to valve body 12 by fastening piece 26.Fastening

piece

22,26 can be bolt, rivet, screw or the fastening piece that is suitable for parts are connected to possible any other type of another parts.

Last shell 14 (Fig. 2) held pressing spring 30 and under-voltage spring 32.Lower limit (minimum) the tolerable gas pressure that under-voltage spring 32 is determined in the gas distributing system.Similarly, cross the upper limit (the highest) the tolerable gas pressure that pressing spring 30 is determined in the gas distributing system.Overvoltage and under-

voltage spring

30,32 are set in the shell 14 with coaxial configuration (that is the central axes setting of two springs) roughly.Yet these springs needn't be by coaxial setting, and these springs can axially depart from mutually.Interior cast tube 34 will be crossed pressing spring 30 and separate with under-voltage spring 32.Outer cast tube 36 centered on pressing spring 30 and protected pressing spring 30 and under-voltage spring 32 the two avoid Effect of Environmental.Under-voltage spring 32 at one end is connected to diaphragm plate 37, at one end is connected to pressure ring 41 and cross pressing spring.Cross pressure ring 41 and can be connected to diaphragm plate 37.Diaphragm plate 37 and mistake pressure ring 41 all can be connected to barrier film 42, and this will discuss hereinafter in further detail.Barrier film 42 is exposed to system pressure in a side, and the opposite side of barrier film 42 is exposed to from the spring force of crossing pressing spring 30 and under-voltage spring 32.The part of barrier film 42 is movably, and can be displaced to the inside of valve body 12 or last shell 14 according to the system pressure along axis A.Axis A is substantially parallel or coaxial with the central axis of crossing pressing spring 30 and under-voltage spring 32.

In the opposite end of barrier film 42, cross that pressing spring 30 contacts respectively with under-voltage spring 32 or against overvoltage adjustable cap 44 and under-voltage adjustable cap 46.Overvoltage adjustable cap 44 and under-voltage adjustable cap 46 can along axis A towards with away from barrier film 42 displacement.In one embodiment, overvoltage adjustable cap 44 and under-voltage adjustable cap 46 can be respectively and outer cast tube 36 and interior cast tube 34 threaded joint.Particularly, overpressure cap 44 both can also can engage with the outer surface thread of interior cast tube 34 with the internal surface of outer cast tube 36.Underpressure cap 46 can with the internal surface threaded joint of interior cast tube 34.Overpressure cap 46 and underpressure cap 44 all can move along axis A, to regulate the spring tension of pressing

spring

30 and 32 pairs of diaphragm plates 37 of under-voltage spring.Distance between

adjustable cap

44,46 and the diaphragm plate 37 is determined the overvoltage and the under-voltage set point of slam shut safety device 10.Compare with traditional Emergeny Cutoff Valves, the central axis of crossing pressing spring 30 and under-voltage spring 32 is set at the same side of barrier film 42.Be convenient to regulate crossing pressing spring 30 and under-voltage spring 32 with crossing the same side that pressing spring 30 and under-voltage spring 32 all be arranged on barrier film 42 from the outside of valve.In addition, can carry out independently of each other the adjusting of crossing pressing spring 30 and under-voltage spring 32.In other words, the user can only regulate pressing spring 30, and did not influence under-voltage spring 32, perhaps can only regulate under-voltage spring 32, and not influence pressing spring 30.Be set in traditional Emergeny Cutoff Valves of opposite side of barrier film at overvoltage and under-voltage spring, the adjusting of a spring is influenced the tension force of another spring, make spring not regulated independently of each other.And, at least one embodiment, will cross that pressing spring 30 and under-voltage spring 32 are coaxial to be arranged so that shell 14 compactnesses, be installed in narrow and small or limited position, space thereby be beneficial to.

Barrier film 42 (Fig. 3 A, Fig. 3 B, Fig. 3 C) comprises and being used for the outer O shape ring 50 of last shell 14 with valve body 12 sealings.Barrier film 42 also comprises first and second concentric room structure 52a, the 52b.O shape the ring 50 and first room structure 52a is separated in outerplanar zone 51.The first room structure 52a and the second room structure 52b are separated in midplane zone 53, and the second room structure 52b and central opening 54 are separated in inner plane zone 55.The first and

second room structure

52a, 52b allow single barrier film 42 be used for low-pressure structure and high voltage structures the two.Low-pressure structure is shown among Fig. 3 B, and high voltage structures is shown among Fig. 3 C.When barrier film 42 was connected to diaphragm plate 37, central opening 54 can be admitted fastening piece (for example bolt).Like this and since barrier film 42 be suitable for high voltage structures and low-pressure structure the two, therefore reduced manufacture cost.In addition, stock control improves because of only needing to store a barrier film, and can realize higher quantity ordered owing to reduced stock's number of components and parts.

Low-pressure structure comprises low pressure diaphragm plate 38, and low pressure diaphragm plate 38 is a rigid plate, and this plate covers inboard room structure 52b, inner plane zone 55 and midplane zone 53 (Fig. 3 B), and allows outside room structure 52a and outerplanar zone 51 to keep movable.Similarly, high voltage structures comprises autoclave diaphragm plate 40, and autoclave diaphragm plate 40 is a rigid plate, and this plate covers outside room structure 52a and midplane zone 53 (Fig. 3 C), and allows inboard room structure 52b, inner plane zone 55 and outerplanar zone 51 to keep movable.Adopt this mode, low pressure diaphragm plate 38 and autoclave diaphragm plate 40 determine which part of barrier film 42 keeps which part of movable and barrier film to be prevented from moving.

Slam shut safety device 10 is connected to the master selector (not shown) by snap ring flange 16 (Fig. 4).Snap ring flange 16 comprises a plurality of openings 56 that are used to admit fastening piece 22.Further, snap ring flange 16 comprises opening 58 along an edge.Because opening 58 can be out of shape and expand so that install, so opening 58 allows quick mounting.The symmetric property of snap ring flange 16 allows slam shut safety device 10 to be connected to the master selector (not shown) in possible any orientation, and can not cause the leakage of gas and water.

Refer again to Fig. 1, valve body 12 comprises the limit switch 18 that is connected to rotatable cam 62, and cam 62 comprises three

cam arm

63a, 63b, 63c.Cam 62 is connected to barrier film 42 by plunger 64 at the first cam arm 63a place.Plunger 64 comprises the plunger arm 65 of downward extension.Tie point 67 places of plunger arm 65 pivot axis skew on the first cam arm 63a and cam 62 are connected to cam 62.Along with plunger 64 response moves up even as big as the overpressure conditions of the power that overcame pressing spring 30 and produce, cam 62 is rotated counterclockwise (in the present embodiment).Along with cam 62 rotation, the breech lock (latch) that is connected to the first cam arm 63a is released, and emergency cut-off plug (not shown) moves to closed position, thereby cuts off the gas supply to master selector.The spring force that responds under-voltage spring 32 overcomes the under-voltage situation of system gas pressure, and plunger 64 moves down, and causes the rotation of cam 62 clockwise directions.Behind predetermined rotating amount, the breech lock that is connected to the first cam arm 63a is released, and the emergency cut-off plug moves to closed position, thereby cuts off the gas supply to master selector.Because limit switch 18 directly is connected to cam 62 by the second cam arm 62b, and the second cam arm 62b is connected to barrier film 42 by cam 62 and plunger 64, so the rotation of limit switch 18 by cam 62 detects moving of barrier film 42.Adopt this mode, the slight change of limit switch 18 response pressures and vertically moving, thus detect moving of barrier film 42, also be like this even return pin assembly 66 damages.

Valve body 12 also comprises the return pin assembly 66 that is used for again sealed cam 62.Return pin assembly 66 comprises release link 68, sealed plug 70, travel indicator 72 (Fig. 5 A, Fig. 5 B) and reset sleeve 74 again.Interaction between the 3rd cam arm 63c of release link 68 sealed again plugs 70 of response and cam 62 and can in reset sleeve 74, sliding.Rotate along with moving of cam 62 response barrier films 42, the first shoulder 71a of the sealed again plug 70 of the 3rd cam arm 63c contact, and order about again sealed plug 70 outside (to the left side of Fig. 1, Fig. 5 A and Fig. 5 B).This then makes release link 68 outwards move, and release link 68 contact travel indicator 72 (Fig. 5 A and Fig. 5 B).Travel indicator 72 can be formed by elasticity, deformable material.When release link 68 contact travel indicator 72, the core of travel indicator 72 outwards is out of shape (shown in Fig. 5 A), thereby produces cam 62 response overvoltages or under-voltage situation and the visual and appreciable indication that rotates.Travel indicator 72 provides the protection of avoiding water or other such environmental effects by form sealing in reset sleeve 74, thus protection release link 68.

In case mistake/under-voltage situation is corrected, return pin assembly 66 can be used for sealed cam 62 again.The user can be with the end (being arranged on the end in the travel indicator) of release link 68 internal displacement to valve body 12.Like this, sealed again plug 70 also can be shifted, and the second shoulder 71b of sealed again plug 70 can contact the 3rd cam arm 63c, rotates to latched position again thereby order about cam 62.

Although this paper shows some representative embodiment and details for illustration purpose of the present invention, it is apparent to those skilled in the art that under the situation that does not deviate from scope of the present invention, can carry out various changes to method and apparatus disclosed herein.

Claims

1, a kind of slam-shut safety valve that is used for gas distributing system, this slam-shut safety valve comprises:

Valve body;

Be installed to the last shell on the described valve body;

Be arranged on described valve body and the described barrier film of going up between the shell, at least a portion of described barrier film can be displaced to the inside of described valve body and be displaced to described inside of going up shell, and described barrier film has first side that is exposed to gas system pressure;

Be arranged on described first spring and second spring of going up in the shell, described first spring applies spring force with described second spring to second side relative with described gas system pressure of described barrier film;

Be connected to the plunger of described first side of described barrier film;

Be installed in the cam in the described valve body revolvably, described cam has the first arm, and described the first arm contacts described plunger;

Engage the breech lock of described the first arm, described breech lock is suitable for being connected to the emergency cut-off valve plug;

Wherein said plunger towards or make described cam rotation and described breech lock unclamped away from described cam mobile.

2, slam-shut safety valve according to claim 1, the coaxial setting of longitudinal axis of wherein said first spring and described second spring.

3, slam-shut safety valve according to claim 1, wherein said cam comprise second cam arm and the 3rd cam arm, and described the 3rd cam arm is suitable for contacting return pin, and described return pin can move the described valve body of turnover.

4, slam-shut safety valve according to claim 3, wherein said return pin at one end comprises the plug that resets, the described plug that resets comprises first shoulder that is suitable for contacting described the 3rd cam arm.

5, slam-shut safety valve according to claim 4, wherein travel indicator is installed in second end of described return pin, and described travel indicator can move to the engaged retracted position of the described breech lock of indication from indicating the released extended position of described breech lock with described return pin.

6, slam-shut safety valve according to claim 5, wherein said travel indicator is formed by elastic material.

7, slam-shut safety valve according to claim 1, wherein said barrier film comprises outer O shape ring, outerplanar portion, first room structure, midplane portion, second room structure and inner plane portion, and described first room structure and second room structure are concentric.

8, slam-shut safety valve according to claim 7, wherein a plate is connected to described barrier film.

9, slam-shut safety valve according to claim 8, wherein said plate cover described first room structure and described midplane portion, and do not cover described second room structure, described outerplanar portion and described inner plane portion.

10, slam-shut safety valve according to claim 7, wherein said plate cover described inner plane portion, second room structure and described midplane portion, and do not cover described first room structure and described outerplanar portion.

11, slam-shut safety valve according to claim 1, wherein said cam comprises second arm, and described second arm is suitable for contacting limit switch, and described limit switch responds the rotation of described cam and vertically moves.

12, slam-shut safety valve according to claim 1 comprises the snap ring flange that is installed in the described valve body outside, and described snap ring flange is suitable for described slam-shut safety valve is fixed to a control valve, and described snap ring flange comprises opening along an edge.

13, slam-shut safety valve according to claim 12, wherein said opening allow described snap ring flange to be out of shape during installation.

14, slam-shut safety valve according to claim 1 comprises first adjustable cap of an end relative with described barrier film that is arranged on described first spring.

15, slam-shut safety valve according to claim 14, wherein said first adjustable cap is fixed to the described shell of going up by screw thread, and described first adjustable cap can be along the axis shift of described first spring, and the displacement of described first adjustable cap changes the size that is applied to the spring force on the described barrier film by described first spring.

16, slam-shut safety valve according to claim 14 comprises second adjustable cap of an end relative with described barrier film that is arranged on described second spring.

17, slam-shut safety valve according to claim 16, wherein said second adjustable cap is fixed to the described shell of going up by screw thread, and described second adjustable cap can be along the axis shift of described second spring, and the displacement of described second adjustable cap changes the size that is applied to the spring force on the described barrier film by described second spring.

18, a kind of slam shut safety device comprises:

Valve body;

Be installed to the last shell on the described valve body;

Be arranged on described valve body and the described barrier film of going up between the shell, described barrier film comprises outerplanar zone, first room structure, midplane zone, second room structure and inner plane zone;

Be installed in described first spring and second spring of going up the inside of shell, described first spring and second spring are suitable for being connected to first plate that covers described first room structure and described midplane zone, or being connected to second plate that covers described inner plane zone, described second room structure and described midplane zone, described first plate and second plate are suitable for being connected to described barrier film.

19, a kind of assembling is used for the method for the slam-shut safety valve of gas distributing system, comprising:

Valve body is provided;

To go up shell and be connected to described valve body;

Barrier film is fixed on described going up between shell and the described valve body, and described barrier film comprises outerplanar zone, first room structure, midplane zone, second room structure and inner plane zone;

First spring and second spring are inserted described inside of going up shell;

Described first spring is connected to first plate, and described first plate covers described first room structure and described midplane zone; Perhaps

Described second spring is connected to second plate, and described second plate covers described inner plane zone, described second room structure and described midplane zone.