CN2277013Y

CN2277013Y - Automatic close valve of gas pipeline

Info

Publication number: CN2277013Y
Application number: CN 96206983
Authority: CN
Inventors: 宋秀峰
Original assignee: Individual
Current assignee: Individual
Priority date: 1996-05-14
Filing date: 1996-05-14
Publication date: 1998-03-25
Anticipated expiration: 2006-05-14

Abstract

The utility model relates to an automatic close valve of a gas pipeline. The utility model is provided with a valve body (1); a gas throttle hole (2) and a main valve (3) for closing the gas throttle hole are arranged between a gas inlet D and a gas outlet E. The right side of the main valve (3) is provided with a piston (34), and the left side is provided with a cavity (A). On the main valve, a damping hole (29) is arranged between the cavity A and (D); the interior of a valve body on the left side of the cavity (A) is provided with a pilot valve seat (7) and a rotatable sleeve barrel (21). A membrane (13), a spacer rings (15), a hand-starting valve membrane (22) and a valve seat (17) are arranged in the rotatable sleeve barrel; the right side of the (13) is communicated with the gas outlet, and the gas inlet is communicated with the left side through a throttle orifice (25). The membrane is moved to the right and closes the pilot valve so as to close the main valve when the pressure of the gas outlet drops, which avoids that a large number of gas leaks out in a pipeline accident.

Description

The gas line self acting stop valve

The utility model relates to valve, particularly safety valve; Equilibrium valve.

In industry or domestic gas pipeline, particularly inflammable gas pipeline, mostly the valve that uses is by the manual control switch now; under abnormal conditions, there is not automatic safety device; in case have an accident then uncontrollable, as earthquake, house collapse; be not intended to destroy in aging or other construction of pipeline and when causing gas or burning line to break; moment manually can't be closed gas circuit, thereby causes gas to leak in a large number, forms blast; on fire, and bring massive losses.

The purpose of this utility model provides a kind ofly can close rapidly when gas leaks in a large number, and must could be opened the gas line self acting stop valve of pipeline by manual operation again.

The purpose of this utility model realizes by following technological scheme, the gas line self acting stop valve has valve body, have suction port and air outlet on the valve body, advance, have solar term hole and the main valve that can seal the solar term hole between the air outlet, it is characterized in that piston shell being arranged at the valve body outer fixing, main valve the air outlet hole side be connected with a piston that can in piston shell, slide, the chamber on piston right side communicate with air outlet gas can give piston with thrust to open main valve, the left chamber of piston communicates with atmosphere, the air inlet side of main valve has chamber A, having on the main valve to make the damping hole that suction port communicates with chamber A and be connected to makes main valve be sitting in spring on the valve seat, pilot valve is housed in the valve body in the left side of chamber A and manually boots valve, said pilot valve has guide's valve seat and the rotating sleeve that is installed on the valve body, and be fixed on pilot valve diaphragm on the sleeve, cone valve is arranged on the diaphragm, connect also and can move axially but rotatable regulating ring and the spring between regulating ring and diaphragm by relative valve seat with bush whorl, rotational sleeve can make regulating ring move axially and Regulation spring acts on the thrust on the diaphragm, the cavity on pilot valve diaphragm right side has the hole that communicates with the air outlet, the cavity in left side has the hole that communicates with suction port, in this hole flow nipple is arranged, the said valve that manually boots has starter gate valve diaphragm and the cone valve that is fixed on the sleeve, valve seat, make valve be sitting in spring on the valve seat, through hole is arranged on the diaphragm, starter gate valve diaphragm right side communicates with pilot valve diaphragm left chamber, the hole that the Kong Zhongyou of starter gate valve valve seat communicates with suction port, also having in the starter gate valve valve seat joins with starter gate valve can handle the hand starting button that the starter gate valve cone valve is lifted off a seat.

Exhaust outside the air outlet is a large amount of suddenly because of accident, pressure sharply descends, as long as surpass the inlet, outlet pressure reduction that allows, the right cavity pressure drop of pilot valve diaphragm descends, then the cavity pressure pressure that communicated with suction port by the left side of diaphragm is pushed to move to right and cone valve is sitting on the valve seat, pilot valve is closed, make the A chamber become the dead band, pressure rises, and main valve and piston right atrial pressure all descend and pressure decline with air outlet pressure, to advance so main valve is sitting in by spring force and the effect of A cavity pressure on the valve seat, the air outlet cuts off, closing automatically when having realized accident.

When desire is opened self acting stop valve, with the hand over hand start button, manually booting valve opens, let out in the hole of pilot valve diaphragm left side cavity pressure self-starting valve base and the hole that the air outlet communicates and remove, pilot valve is opened by spring, chamber A communicates with the air outlet and pressure decline, and the right cavity of piston then pressure rises, thereby with main valve open.

Therefore realized the work of opening valve by people's manipulation.

This gas line self acting stop valve, can when pipeline a large amount of leakage suddenly, blind off a line automatically rapidly, as long as after closing, can only just can open by manual operation, can prevent that gas from leaking in a large number, set off an explosion, major accidents such as catching fire, it is active in one's movements, and is safe and reliable, it is closed with manually opened automatically all based on the normal barometric pressure of gas piping, need not other energy.

Below, in conjunction with the accompanying drawings and embodiments gas line self acting stop valve of the present utility model is explained in detail.

Fig. 1 is the embodiment's of the utility model gas line self acting stop valve a structural representation.

As Fig. 1, for sake of convenience, valve is divided into left side and right side by marking on the figure, this self acting stop valve has a valve body 1, suction port D and air outlet E are arranged on the valve body 1, advance, solar term hole 2 and main valve 3 are arranged between the air outlet, main valve 3 can seat on the valve seat in solar term hole 2 and the solar term hole is sealed, thereby suction port D and air outlet E can be cut off, be connected with the bar 31 of an end hollow at the air outlet side of main valve 3, one end of bar 31 hollows has piston 34, piston 34 can move in the piston shell on being fixed in valve body 1 33, the porose logical atmosphere in the left side of piston shell, the power of spring 32 with piston 33 bullets to the right, (also can only with spring 5 and without spring 32), has hole 30 on the bar 31, the piston right side is communicated with air outlet E and make the gas of air outlet side can enter the right side of piston 34, also can on valve body 1 and piston shell 33, hole and piston 34 right sides are communicated with suction port E gas, air inlet side at main valve 3, has a chamber A on the valve body 1, main valve 3 can slide in chamber A and seal or open solar term hole 2, there is damping hole 29 that suction port D is communicated with chamber A on the main valve, on main valve 3, also has step 4, valve body 1 also has a cavity in the left side of chamber A, wherein fixing is equipped with pilot valve and manually boots valve, pilot valve comprises the guide's valve seat 7 that is fixed on the valve body 1, has a spring 5 between it and the main valve 3, this spring is pressed to solar term ports valve seat with main valve 3, the left side of guide's valve seat 7 has a sleeve 21, sleeve 21 is spacing and can rotate in valve body 1 by valve gap 19, in sleeve 21, right-to-left is equipped with the regulating ring 27 that is connected with bush whorl successively, spring 8, the diaphragm of being pushed down by spring 8 13, cone valve 11 is arranged on the diaphragm, dividing plate 15, the spring 24 of hand starting valve, diaphragm and the cone valve 22 pushed down by spring 24, valve seat 17, be contained in hand starting button 20 and gland 18 in the valve seat 17, gland 18 is threaded with sleeve 21, therefore can be with diaphragm 13,22 push down and fix with sleeve, formerly on the guide valve seat 7 pin 26 is arranged, pin 26 is through in the hole of regulating ring 27, there is valve seat orifice at the center of guide's valve seat, the cone valve 11 of diaphragm 13 can be sat thereon, (left-hand end of sleeve 21 has breach when rotational sleeve 21, can be in order to rotational sleeve), screw thread make regulating ring can a left side, move right, thereby the logical decrement of adjustable springs B and regulating action are at the spring force of diaphragm 13, the hole 6 that diaphragm 13 right chamber 8 stepped the hole 9 process valve bodies 1 on the sleeve 21 communicates with air outlet E, the C chamber in the left side of diaphragm 13 then communicates with suction port D by the hole 28 of the hole on the dividing plate 15 14 on flow nipple on the housing 25 and valve body, the cone valve of diaphragm 22 leans on the elastic force seat of spring 24 on the valve seat orifice of valve seat 17, the right side of diaphragm 22 also communicates with suction port D by hole 14, through hole 23 is arranged on the diaphragm, and porose 15 communicate in the valve seat orifice with hole 12 on the valve body, hole 12 communicates with hole 6, so it also is to communicate with the air outlet E of housing, hand starting button 20 can be left in the hole in the valve seat 17, the right side is mobile a little, then presses valve block 22 when right-hand valve 22 and valve seat are thrown off when pressing to.Preferably there is stiffening plate 10 both sides of valve block 13 to increase the intensity of diaphragm.

The action principle of this self acting stop valve is as follows:

One, when being provided with in the pipeline when supplying gas, be normal pressure in the valve, this moment, main valve 3, did not communicate into and out of pore D, E on the valve seat in solar term hole 2 by the elastic force wedge of spring 5 and 32.

Two, after supplying gas in the pipeline:

After breathing freely in the pipeline, suction port D has pressure, pressure by hole 28 and solar term mouth 25 this in the hole 14 of dividing plate 15, so there is pressure in the C chamber, this pressure is pressed diaphragm 13 to the right and is made valve block on valve seat, suction port 1) pressure also enters the A chamber by damping hole 29 simultaneously, because the A chamber is big than the B cavity volume, so it is slower to boost, and the C cavity pressure rises soon, before the B cavity pressure rose, the C cavity pressure raise; And pilot valve is closed; Even the A cavity pressure raises thereafter, because of guide's valve seat hole area is little, also push away not open pilot valve, the A cavity pressure will make main valve 3 be pressed on the valve seat after reaching the air inlet pressure, still can not ventilate.

Three, open the gas line self acting stop valve, make the pipeline ventilation:

Start button 20 with hand, diaphragm 22 pushed away to the right and the cone valve 22 and the valve seat of valve seat 17 are left, the Pneumatic pipe cleaner via hole 14 in C chamber, 23,16,12 and let out to air outlet E, and the gas of suction port has pressure drop behind flow nipple 25, the C cavity pressure can not be set up at once, the power of spring 8 moves to left diaphragm 13 and cone valve 11 is lifted off a seat, and forms the condition of pilot valve conducting shunting, and then the A cavity pressure 6 is directed at air outlet E through the hole, damping hole 29 makes the A chamber, with suction port D one pressure reduction is arranged, at this moment, main valve 3 right-hand member steps 4 are subjected to the power of suction port pressure and the suffered air outlet of piston 34 right-hand members pressure will overcome two springs 5,32 and the power of A chamber pressure and be moved to the left and open, suction port D and air outlet E are switched on.After the conducting, decontrol hand push button 20, then diaphragm 22 rebounds seat on valve seat by spring 24 power, closes by 16.

Four, the normal unlatching:

The air pressure air-flow of suction port D, damping hole 29 through main valve 3 enters the A chamber, enter air outlet E by guide's valve seat 7 center holes and B chamber, form shunting, the A chamber becomes the district that flows through, under the effect of solar term hole 2 and damping hole 29, make to produce between air outlet E and the suction port D and allow pressure reduction relatively, make main valve 3 right side pressure greater than left side pressure, the pressure that adds upper piston 34 right sides, to balance each other and to make main valve be in the position of unlatching with spring force, to the equilibrium of forces position and staticly often open, so this valve pilot valve 11 is opened, main valve 3 can be opened, and the condition that pilot valve is opened is that power+B chamber pressure * diaphragm 13 active areas of spring 8 should be more than or equal to the active area of C chamber pressure * diaphragm 13.

Five, useless gas is often opened

During as the useless gas in air outlet, then D, E pressure equate, the pressure on piston 34 right sides will overcome the elastic force of spring 5,32 and main valve 4 is often opened this moment.

Behind the useful gas, the E mouth pressure descends, and causes A chamber and piston right atrial pressure to descend, main valve 3 will slightly move to sets up relative permission pressure reduction between air outlet and the suction port, can remain on this position, so, along with the size of gas consumption, the position of main valve 4 is self-adjusting.

Six, close automatically

Exhaust outside E tired accident in air outlet is a large amount of suddenly is when pressure reduces, as long as above design pressure difference, B chamber, matrix 13 right side pressure descends, then matrix pushed to move to right by the C cavity pressure and 11 on valve pilot valve is closed on valve seat 7, make the A chamber form the dead band, its pressure will rise, because air outlet E pressure descends, piston 34 right atrial pressures descend, so main valve is by spring 5,32 power and A cavity pressure, move right and seat on valve seat and inlet, outlet is closed partition.After closing, D, E pressure difference heighten, and main valve will be pressed on the valve seat always, can not open, and have only when the manual unlatching of personnel selection and just can open closing automatically when having realized accident.

Once after closing, can not open voluntarily, have only by the 3rd unlatching of this specification gas line self acting stop valve to make the method for pipeline ventilation just can open this valve.

According to various pipeline gas flow differences, can utilize sleeve 21 adjust pilot valves spring 8 decrement and adjust its pressure, can adjust the operating pressure of pilot valve, can adjust the pressure reduction amplitude of variation of 2 front and back, solar term hole, general this amplitude can be decided to be 0.01-0.1mpa, in case unnecessary the closing that makes the mistake during gas just commonly used.The diameter of damping hole 29 and flow nipple 25 is decided according to throughput, can be the 1-2.5 millimeter.

Gas line self acting stop valve of the present utility model can guarantee the normal conveying gas of pipeline of all sizes, can close automatically rapidly when accident appears in the rear portion pipeline again, as long as can not open automatically after closing, must just can be opened by manual operation.Therefore can avoid leaking in a large number and the unlatching of various mistakes because of accident gas, particularly inflammable gas and toxic gas, can prevent blast, on fire, the generation of serious accidents such as poisoning is closed with manually opened automatically all based on the normal barometric pressure in the pipeline, need not other energy, be active in one's movements, safe and reliable.

Claims

1, a kind of gas line self acting stop valve; Has valve body (1); Have suction port (D) and air outlet (E) on the valve body, advance, have solar term hole (2) between the air outlet and can seal the main valve (3) in solar term hole, it is characterized in that outside valve body, having piston shell (33), the air outlet hole side of main valve (3) is connected with a piston that can slide (34) in piston shell, the chamber on piston (34) right side communicates with air outlet (E) gas, left chamber communicates with atmosphere, has chamber (A) on the air inlet side valve body of main valve (3), has the damping hole (29) that suction port (D) is communicated with chamber (A) on the main valve (3), also be connected to and make main valve (3) be sitting in spring (5) on the valve seat, also have pilot valve in the valve body in the left side of chamber (A) and manually boot valve, said pilot valve has guide's valve seat (7) and rotating sleeve (21) fixing on valve body, be fixed on the pilot valve diaphragm (13) on the sleeve (21), cone valve (11) is arranged on the diaphragm (13), be threaded with sleeve (21) and can relative valve seat (7) move axially but the regulating ring (27) and the spring (8) between regulating ring (27) and diaphragm (13) that do not turn, diaphragm (13) right side cavity (B) has the hole (6) that communicates with air outlet (E) gas, diaphragm (13) left side cavity (C) has the hole (28) that communicates with suction port (D) gas, flow nipple (25) is arranged in the hole (28), the said valve that manually boots has the sleeve of being fixed on, (21) diaphragm on and cone valve (22) and valve seat (17), make valve seat be sitting in spring (24) on the valve seat (17), through hole (23) is arranged on the diaphragm, the diaphragm right side communicates with chamber (C) gas, the hole (16) that communicates with hole (6) is arranged in the valve seat orifice of valve seat (17), also have the hand starting button (20) that can make cone valve (22) disengaging valve seat (17) in the valve seat (17).

2, by the described gas line self acting stop valve of claim 1, it is characterized in that it is the bar (31) that part hollow is arranged between piston (34) and the main valve (3) that said piston (34) right chamber communicates with air outlet (E) gas, has the hole (30) of logical suction port on the bar.

3, by the described gas line self acting stop valve of claim 1, it is characterized in that it is on valve body (1) and piston shell (33) hole that communicates to be arranged that said piston (34) right chamber communicates with air outlet (E) gas.

4,, it is characterized in that upward effect spring springy (32) of said piston (34) by the described gas line self acting stop valve of claim 1.

5, by the described gas line self acting stop valve of claim 1, it is characterized in that there is stiffening plate (10) said diaphragm (13) both sides.