CN202590121U

CN202590121U - By-passing valve

Info

Publication number: CN202590121U
Application number: CN 201120570403
Authority: CN
Inventors: 郑殿会
Original assignee: Beijing Aeonmed Co Ltd
Current assignee: Beijing Aeonmed Co Ltd
Priority date: 2011-12-30
Filing date: 2011-12-30
Publication date: 2012-12-12
Anticipated expiration: 2021-12-30

Abstract

The utility model discloses a by-passing valve comprising a valve body. The valve body is provided with a gas inlet and a gas outlet, and a one-way valve is arranged at the gas outlet. The one-way valve comprises a one-way valve body, a ventilation plate and a first sealing gasket. A first gas channel is arranged in the one-way valve body. The ventilation plate is provided with air vents, and the air vents are communicated with the gas outlet. The first sealing gasket is arranged between the ventilation plate and the one-way valve body. The first gas channel and the air vents are selectively communicated by the first sealing gasket. By arranging the one-way valve at the gas outlet, the by-passing valve enables the gas flow to be one and only, overcomes a problem that anesthetic gas concentration is inaccurate due to gas back flow, and has advantages of good structural manufacturability and gas tightness.

Description

Bypass valve

Technical field

This utility model relates to medical instruments field, relates in particular to a kind of bypass valve.

Background technology

Anesthetic machine is operating room safety, stability, the exigent equipment of ease for operation; It sends into anesthetics through mechanical circuit patient's alveolar; Form the anesthetics partial pressure, permeate into blood after, inhibitory action is directly taken place in the central nervous system; Thereby produce the effect of general anesthesia, anesthetic machine mainly comprises air supply system, volatilization jar, respirator and four parts of circuit system.

Anesthesia evaporator is the important composition parts on the anesthetic machine, and it provides stable, concentration to anaesthetize mist accurately through anesthetic machine to patient.It can effectively evaporate anesthetics; Can also control the output concentration of anesthesia steam accurately.

Anesthetic machine links to each other through bypass valve with anesthesia evaporator.When the access failure anesthesia evaporator, anesthetic machine is carried gas through bypass valve to patient end, and this moment, bypass valve played the effect of the passage of carrying gas; So should guarantee gas does not outwards reveal; If air-tightness is good inadequately, just have portion gas and leak, cause the wasting of resources; The gas of bypass valve of also should guaranteeing simultaneously to flow through does not have vapour lock or vapour lock is very little, so that unobstructed to patient end gas is provided; After connecting anesthesia evaporator, the gas delivery channels that bypass valve self has is closed, all gas anesthesia evaporator of flowing through; Get into anesthetic machine through bypass valve once more through vaporizer output, carry patient end, this moment, bypass valve should guarantee that anesthetis do not reveal; If air-tightness is bad, cause anesthetis to reveal, be not only the wasting of resources; To a kind of anesthesia of doctor, the quality of operation and patient's safety have been influenced greatly especially.

Traditional bypass valve all has air inlet and gas outlet, and during work, gas gets into vaporizer from air inlet through bypass valve; Get into the anesthetic machine downstream once more through the bypass valve gas outlet by vaporizer output, and then be delivered to patient end, in the actual mechanical process; When gas outlet pressure has fluctuation; Will make back flow of gas, the anesthesia gas concentration that causes exporting is accurate inadequately, makes troubles to use; Also there is the processability of product structure defective in traditional bypass valve simultaneously, and defective such as air-tightness is good inadequately.

The utility model content

The purpose of this utility model is to solve traditional bypass valve gas outlet when pressure oscillation is arranged; Can cause the back flow of gas phenomenon, further cause the coarse problem of anesthesia gas concentration exported, a kind of bypass valve is provided; It is provided with check valve through the gas outlet at bypass valve; Make gas flow unique, can not cause the back flow of gas phenomenon, and have processability of product structure and the better advantage of air-tightness.

The purpose of this utility model is to realize through following technical scheme:

A kind of bypass valve; Comprise valve body, said valve body has air inlet and gas outlet, and the place is provided with check valve in said gas outlet; Said check valve comprises check valve valve body, air permeable plate and first sealing gasket; Said check valve valve body inside has gas transmission and uses first gas passage, has air-vent on the said air permeable plate, and said air-vent is connected with said gas outlet; Said first sealing gasket is arranged between air permeable plate and the check valve valve body, is communicated with through the first sealing gasket selectivity between said first gas passage and the air-vent.

Further; Said valve body is provided with valve gap; Has second gas passage in the said valve gap; Have the 3rd gas passage, first cavity that communicates with air inlet, second cavity that communicates with first cavity in the said valve body, said second cavity and the 3rd gas passage are used for said bypass valve and when the access failure vaporizer, carry gas, and said first cavity communicates with second cavity.

Preferably; The said valve body in corresponding said gas outlet is provided with the step cannelure; Be respectively first cannelure and second cannelure; Said air permeable plate is installed in said first cannelure, be close to said air permeable plate the outer face, through screw said check valve valve body is fastened on the said valve body, be provided with sealing ring at the joint of the joint of said air permeable plate and said valve body, said check valve valve body and said valve body.

Preferably; The said first cavity top has female thread; Said valve gap coupling female thread is provided with external screw thread, so that said valve gap is threaded on the said valve body ring cutting two grooves on said valve gap; And lay respectively at said externally threaded upper and lower both sides; And sealing ring all is set in two grooves, and be used to strengthen the air-tightness between said valve gap and the vaporizer at the sealing ring of said external screw thread upside, be used to strengthen the air-tightness between said valve gap and the valve body at the sealing ring of said external screw thread downside;

Said the 3rd gas passage is arranged on the below of said first cavity; And communicate with the bottom of first cavity; So that being, said second gas passage and the 3rd gas passage be oppositely arranged; The outlet of corresponding said second gas passage is provided with first boss in said valve gap bottom, and the import of corresponding said the 3rd gas passage is provided with second boss in the bottom of said first cavity.

Further, be provided with the 3rd cannelure at the place, end that said check valve valve body and air permeable plate join, said the 3rd cannelure communicates with said first gas passage;

Said air permeable plate integral body is rounded, and at its outer rim ring cutting step surface is arranged, and is used to install sealing ring, has centre bore on the said air permeable plate, also has some air-vents;

Be provided with first sealing gasket between said air permeable plate and the check valve valve body,, realize that said gas outlet is communicated with the first gas passage selectivity through the motion of said first sealing gasket.

Further; In the installing space of forming by said second gas passage, first cavity, the 3rd gas passage, be provided with spool; Said spool is provided with second sealing gasket; Said second sealing gasket through moving up and down of said second sealing gasket, realizes that first cavity is communicated with second gas passage, the 3rd gas passage selectivity between first boss and second boss.

Further, said first sealing gasket comprises integrated disc portions and rod member part, and said rod member partly is arranged on the center of said integrated disc portions; Said first sealing gasket is installed between said air permeable plate and the check valve valve body; So that said rod member partly passes said centre bore, and the length of said rod member part is greater than the thickness of said air permeable plate, and said rod member part outer end is provided with limited cap; So that said first sealing gasket does not fall off in said air permeable plate; When said integrated disc portions is adjacent to said air permeable plate, be blocked said gas outlet and the blocking-up of said first gas passage between said air-vent and said the 3rd cannelure.

Further, said spool comprises gland, upper spring, valve rod, the lower spring that links to each other successively from top to bottom;

Said gland upper end has first convexity; Corresponding said first convexity inwardly is provided with second convexity in the upper end of said valve gap, and said second convexity is positioned at the import department of said second gas passage, through said first convexity and second protruding the cooperating; Said gland is limited in said second gas passage; Said gland integral body is cylindrical, at its peripheral evenly rip cutting four straight flanges, and leaves the circular arc guide part in the center of straight flange.

Further; The external diameter of said integrated disc portions is less than the internal diameter of said the 3rd cannelure; Be provided with the spacing preiection of some said integrated disc portions in said the 3rd cannelure; Said the 3rd cannelure is communicated with said first gas passage, and gives vent to anger through being threaded in the outer end of said first gas passage and to use pipe joint.

Further; Said gland bottom centre extends upward and has mounting groove, and the said mounting groove oral area of going up falls filleted corner, and said valve rod top center has down mounting groove to extending below; Said upper spring one end is installed in the mounting groove, and the other end is installed in down in the mounting groove;

Said valve rod middle part is provided with annular solid; Said annular solid top has the conical surface; The lower surface of being close to said annular solid has the second sealing gasket mounting groove on said valve rod, said second sealing gasket is installed on the said valve rod through the second sealing gasket mounting groove, and it is peripheral that said lower spring is enclosed within said stem lower portion; One end places in said the 3rd gas passage, and the other end contacts the lower surface of said second sealing gasket.

The beneficial effect of this utility model is: the place, gas outlet through at valve body is provided with check valve, and when gas flow was normal flow direction, check valve was opened, and gas flows out smoothly; When pressure oscillation appears in the gas outlet, cause the gas reverse counterflow, this moment, closed check valve stoped the adverse current of gas so that the anesthesia gas concentration of output the same with setting value accurate reliably; Specifically, check valve comprises check valve valve body, air permeable plate, both through with the cooperating the unlatching that realizes check valve or close of first sealing gasket; When gas flow is normal flow direction, promptly flow to the gas outlet, under the effect of gas pressure from first cavity; Promote first sealing gasket to the first gas passage side shifting; Making wins the slit occurs between sealing gasket and the air permeable plate, and gas flows to first gas passage from air-vent, realizes the output of gas; When the gas reverse counterflow, promptly inwardly flow to from first gas passage, under the effect of gas pressure, make the sealing gasket of winning be adjacent to air permeable plate, further make win gas passage and gas outlet blocking-up, gas can not flow in the bypass valve from first gas passage; Be provided with the dual-seal circle through joint, strengthened the air-tightness between valve gap and valve body, the vaporizer at valve gap and valve body; Junction through at joint, air permeable plate and the valve body of check valve valve body and valve body all is provided with sealing ring, has strengthened the air-tightness between check valve and the valve body.The contrast prior art, the described bypass valve of this utility model has can guarantee that gas flow is unique, simple in structure, the better advantage of air-tightness.

Description of drawings

According to accompanying drawing and embodiment this utility model is done further explain below.

Fig. 1 is the partial schematic sectional view of the described bypass valve of this utility model;

Fig. 2 is the cross-sectional schematic of the valve body shown in Fig. 1;

Fig. 3 is the cross-sectional schematic of the valve gap shown in Fig. 1;

Fig. 4 is the schematic perspective view of the gland shown in Fig. 1;

Fig. 5 is the cross-sectional schematic of the gland shown in Fig. 1;

Fig. 6 is the schematic perspective view of the valve rod shown in Fig. 1;

Fig. 7 is the cross-sectional schematic of the valve rod shown in Fig. 1;

Fig. 8 is the schematic perspective view of the check valve valve body shown in Fig. 1;

Fig. 9 is the cross-sectional schematic of the check valve valve body shown in Fig. 1;

Figure 10 is the schematic perspective view of the air permeable plate shown in Fig. 1;

Figure 11 is the cross-sectional schematic of the air permeable plate shown in Fig. 1;

Figure 12 is the schematic perspective view of first sealing gasket shown in Fig. 1.

Among the figure:

1, valve body; 11, first cavity; 12, second cavity; 13, the 3rd gas passage; 14, first cannelure; 15, second cannelure; 16, second boss; 17, first groove;

2, valve gap; 21, second gas passage; 22, second convexity; 23, first boss; 24, second groove; 25, the 3rd groove;

3, spool;

31, gland; 311, first convexity; 312, go up mounting groove; 313, guide part;

32, upper spring;

33, valve rod; 331, following mounting groove; 332, annular solid; 333, the second sealing gasket mounting groove;

34, lower spring;

35, second sealing gasket;

4, check valve;

41, check valve valve body; 411, first gas passage; 412, the 3rd cannelure; 413, spacing preiection;

42, air permeable plate; 421, air-vent; 422, step surface;

43, first sealing gasket; 431, integrated disc portions; 432, rod member part; 433, limited cap;

5, sealing ring;

6, pipe joint.

The specific embodiment

As shown in Figure 1, in present embodiment, the described bypass valve of this utility model; Comprise valve body 1, valve body 1 has air inlet and gas outlet, and the place is provided with check valve 4 in the gas outlet; Check valve 4 comprises check valve valve body 41, air permeable plate 42 and first sealing gasket 43, and check valve valve body 41 inside have gas transmission with first gas passage 411, have air-vent 421 on the air permeable plate 42; Air-vent 421 is connected with the gas outlet, and first sealing gasket 43 is arranged between air permeable plate 42 and the check valve valve body 41, is communicated with through first sealing gasket, 43 selectivitys between first gas passage 411 and the air-vent 421; When gas outwards flowed out from the gas outlet, check valve 4 was opened, and the slit occurs between first sealing gasket 43 and the air permeable plate 42; So that be communicated with between air-vent 421 and first gas passage 411, realize that gas exports normally, when pressure oscillation appears in the gas outlet; The adverse current phenomenon appears in gas, and check valve 4 is closed, and first sealing gasket 43 is adjacent to air permeable plate 42; So that blocking-up between the air-vent 421 and first gas passage 411, realization gas can not adverse current be gone into bypass valve.

Valve body 1 is provided with valve gap 2, is provided with spool 3 between valve gap 2 and the valve body 1, and second sealing gasket 35 is installed on the spool 3, and spool 3 comprises gland 31, upper spring 32, valve rod 33, the lower spring 34 that links to each other successively from top to bottom.

As shown in Figure 2, provided a specific embodiment of valve body, have first cavity 11 that communicates with the air inlet (not shown) on the valve body 1; Second cavity 12, the 3rd gas passage 13, the first cavitys 11 tops that communicate with first cavity 11 have female thread, and valve gap 2 is used to be threaded; Second cavity 12 and the 3rd gas passage 13 are used for when this bypass valve access failure vaporizer, carrying gas, and the 3rd gas passage 13 is positioned at the below of first cavity 11, and communicates with the bottom of first cavity 11; The import of corresponding the 3rd gas passage 13 is provided with second boss 16 in the bottom of first cavity 11; Concentric two cannelures that have at the place, gas outlet are respectively first cannelure 14 and second cannelure 15, also are provided with first groove 17; First cannelure 14 is used to install the air permeable plate 42 of check valve; First groove, 17 set inside sealing rings 5 because it is positioned at the joint of check valve and bypass valve, can play the bubble-tight effect of strengthening between check valve and the bypass valve.

As shown in Figure 3, provided a specific embodiment of valve gap, valve gap 2 adopts hollow structures; Make its inside have second gas passage 21, its bottom is the outlet of second gas passage 21, and the top is the import of second gas passage 21; Anesthetic gases gets into from import; Discharge from outlet, the outlet of corresponding second gas passage 21 is provided with first boss 23 in valve gap 2 bottoms, and valve gap 2 tops inwardly have second protruding 22; The middle part is provided with external screw thread; Be positioned at said externally threaded up and down both sides and be provided with sealing ring 5 being provided with respectively on the valve gap 2 in second groove 24 and the 3rd groove 25, the second grooves 24 and the 3rd groove 25, when valve gap 2 is installed in 1 last time of valve body; Sealing ring 5 at the threaded connection place upside has guaranteed the air-tightness between valve gap 2 and the vaporizer, has guaranteed to have good air-tightness between valve body 1 and the valve gap 2 at the sealing ring 5 of threaded connection place downside.

Like Fig. 1, shown in 4～7, provided a specific embodiment of spool, spool 3 comprises gland 31, upper spring 32, valve rod 33, lower spring 34; Gland 31 is whole cylindrical, and the even rip cutting of its periphery has four straight flanges, and said straight flange can make and form gas passage between valve gap 2 and the gland 31; And leave circular arc guide part 313 in the center of straight flange; Guide part 313 can make gland 31 enough steadily reliable at valve gap 2 internal motions, and gland 31 tops are provided with first convexity 311, and bottom centre extends upward and has mounting groove 312; Last mounting groove 312 oral areas fall filleted corner; Be convenient to the assembling with upper spring, the top center of valve rod 33 has down mounting groove 331 to extending below, and the middle part of valve rod 33 is provided with annular solid 332; The top of annular solid 332 has the conical surface, and the lower surface of being close to annular solid 332 has the second sealing gasket mounting groove 333 on valve rod 33.

During installation, upper spring 32 1 ends are installed in the mounting groove 312, the other end is installed in down in the mounting groove 331; Second sealing gasket 35 is installed on the valve rod 33 through the second sealing gasket mounting groove 333, and lower spring 34 is enclosed within the periphery, bottom of valve rod 33, and an end places in the 3rd gas passage 13; The other end contacts the lower surface of second sealing gasket 35, with spool 3 alignment valve gaps 2 inside, through compressing upper and lower spring 32,34 valve gap 2 is tightened on the valve body 1 then; Hold out against each other through first protruding 311 and second protruding 22; Gland 31 is limited in second gas passage 21, because second gas passage 21 and the 3rd gas passage 13 are oppositely arranged, second sealing gasket 35 is between first boss 23 and second boss 16; When second sealing gasket 35 moves upward; And when holding out against with first boss 23, second gas passage 21 is by shutoff, and first cavity 11 is connected with the 3rd gas passage 13; When second sealing gasket 35 moves downward, and when holding out against with second boss 16, the 3rd gas passage 13 is by shutoff, and first cavity 11 is connected with second gas passage 21.

Like Fig. 1, shown in 8～12; Provided a specific embodiment of check valve, check valve 4 is installed in the place, gas outlet, and it comprises check valve valve body 41 and air permeable plate 42; Has first gas passage 411 in the check valve valve body 41; The import department that is positioned at first gas passage 411 have have some spacing preiection 413, the first gas passages 411 in the 3rd cannelure 412, the three cannelures the exit through the pipe joint 6 that is threaded; Also have screwed hole on the check valve valve body 41, it can be connected on the valve body 1 through screw;

Air permeable plate 42 is whole rounded, has centre bore on it, also has four air-vents 421, and air permeable plate 42 outer rim ring cuttings have step surface 422, and step surface 422 is provided with sealing ring 5;

Between air permeable plate 42 and check valve valve body 41, be provided with first sealing gasket 43; First sealing gasket 43 comprises integrated disc portions 431 and rod member part 432, and rod member part 432 is arranged on the center of integrated disc portions 431, and the length of rod member part 432 is greater than the thickness of air permeable plate 42; Rod member part 432 is moved back and forth in the centre bore of air permeable plate 42; In order to make first sealing gasket 43 air permeable plate 42 that do not come off, be provided with limited cap 433 in the end of rod member part 432, the overall dimensions of limited cap 433 is greater than the centre bore aperture; And some spacing preiections 413 are set in the 3rd cannelure 412, with the position of limit disk part 431.

During installation, at first rod member part 432 and limited cap 433 are penetrated in the lump the centre bore of air permeable plate 42, then air permeable plate 42 and sealing ring 5 are installed in first cannelure 14 in the lump; So that limited cap 433 is positioned at second cannelure 15; Again that integrated disc portions 431 is mutually bonding with rod member part 432, the sealing ring 5 of in first groove 17, packing into, and make integrated disc portions 431 corresponding with the 3rd cannelure 412; Check valve valve body 41 is fastened on the valve body 1 through screw; Because the external diameter of integrated disc portions 431 is less than the 3rd cannelure 412 internal diameters, integrated disc portions 431 places in the 3rd cannelure 412, when integrated disc portions 431 is adjacent to air permeable plate 42; But its shutoff air-vent 421, so that gas outlet and 411 blocking-up of first gas passage.

The operation principle of the described bypass valve of this utility model: as shown in Figure 1, only show the partial structurtes of the described bypass valve of this utility model among the figure, bypass valve is actual to have two identical valve gaps; Be installed on the valve body; Have two separate gas circuits in the valve body, when the access failure vaporizer, the actual effect of playing a gas passage of bypass valve of this moment; Gas gets into valve body from the air inlet pipe joint, finally from 12 outputs of second cavity; When bypass valve is connected vaporizer; Two valve gaps all articulate vaporizer, (promptly vaporizer needs cooperate with two valve gaps simultaneously, could realize and being connected of bypass valve); Gas gets into valve inner from the air inlet pipe joint; Get into vaporizer from first valve gap again, get into valve body from vaporizer once more through second valve gap then, export from the pipe joint of gas outlet at last.Wherein valve gap top periphery design becomes hexagonal structure, and it mainly acts on is the assembling that makes things convenient between itself and the valve body, and (be valve gap peripheral structure be mainly used in match) with assembly tool, each bypass valve can articulate one or more vaporizers simultaneously.

When the access failure vaporizer, the actual effect of playing a gas passage of bypass valve of this moment, second cavity 12 is the outlet side part of this gas passage; Gland 31 is not depressed, and under the elastic force effect of lower spring 34, second sealing gasket 35 holds out against first boss 23; Second gas passage 21 is by shutoff; Gas enters in first cavity 11 from air inlet, gets into second cavity 12 and the 3rd gas passage 13 then, enters into the portion gas of the 3rd gas passage 13; Get into second cavity 12 again, get into the anesthetic machine downstream through bypass valve pipeline and joint (not shown) again.

When connecting vaporizer, gland 31 is depressed, and moves downward so that second sealing gasket 35 overcomes lower spring 34 elastic force; And hold out against with second boss 16, the 3rd gas passage 13 is by shutoff, and anesthetic gases gets into first cavity 11 from second gas passage 21; Because second cavity, 12 ends are provided with plug, the gas passage that bypass valve self has is closed, and makes gas can only flow into the gas outlet; When entering into second cannelure, 15 inside; Gas pressure promotes first sealing gasket 43 and moves right so that the slit occurs between first sealing gasket 43 and the air permeable plate 42, gas from air-vent 421 in this slit flows into the 3rd cannelure 412; And then flow in first gas passage 411, and from pipe joint 6 outputs.

When gas gets into first gas passage 411 from pipe joint 6; When the adverse current phenomenon occurring; Gas pressure promotes first sealing gasket 43 to left movement, and makes integrated disc portions 431 be adjacent to air permeable plate 42, shutoff air-vent 421; So that block between first gas passage 411 and the gas outlet, gas can not flow in the valve body 1.

Claims

1. bypass valve; Comprise valve body (1), said valve body (1) has air inlet and gas outlet, it is characterized in that: the place is provided with check valve (4) in said gas outlet; Said check valve (4) comprises check valve valve body (41), air permeable plate (42) and first sealing gasket (43); Said check valve valve body (41) inside has gas transmission with first gas passage (411), has air-vent (421) on the said air permeable plate (42), and said air-vent (421) is connected with said gas outlet; Said first sealing gasket (43) is arranged between air permeable plate (42) and the check valve valve body (41), is communicated with through first sealing gasket (43) selectivity between said first gas passage (411) and the air-vent (421).

2. bypass valve according to claim 1; It is characterized in that: said valve body (1) is provided with valve gap (2); Has second gas passage (21) in the said valve gap (2); Have the 3rd gas passage (13), first cavity (11) that communicates with air inlet, second cavity (12) that communicates with first cavity (11) in the said valve body (1), said second cavity (12) and the 3rd gas passage (13) are used for said bypass valve and when the access failure vaporizer, carry gas.

3. bypass valve according to claim 1; It is characterized in that: the said valve body in corresponding said gas outlet (1) is provided with the step cannelure; Be respectively first cannelure (14) and second cannelure (15); Said air permeable plate (42) is installed in said first cannelure (14); Be close to said air permeable plate (42) the outer face, through screw said check valve valve body (41) is fastened on the said valve body (1), be provided with sealing ring (5) at joint, the said check valve valve body (41) of said air permeable plate (42) and said valve body (1) with the joint of said valve body (1).

4. bypass valve according to claim 2; It is characterized in that: said first cavity (11) top has female thread; Said valve gap (2) coupling female thread is provided with external screw thread, so that said valve gap (2) is threaded on the said valve body (1), goes up ring cutting two grooves at said valve gap (2); And lay respectively at said externally threaded upper and lower both sides; And sealing ring (5) all is set in two grooves, and the sealing ring (5) that is positioned at said external screw thread upside is used to strengthen the air-tightness between said valve gap (2) and the vaporizer, and the sealing ring (5) that is positioned at said external screw thread downside is used to strengthen the air-tightness between said valve gap (2) and the valve body (1);

Said the 3rd gas passage (13) is arranged on the below of said first cavity (11); And communicate with the bottom of first cavity (11); So that being with the 3rd gas passage (13), said second gas passage (21) is oppositely arranged; The outlet of corresponding said second gas passage (21) is provided with first boss (23) in said valve gap (2) bottom, and the import of corresponding said the 3rd gas passage (13) is provided with second boss (16) in the bottom of said first cavity (11).

5. bypass valve according to claim 3 is characterized in that: the place, end in that said check valve valve body (41) and air permeable plate (42) join is provided with the 3rd cannelure (412), and said the 3rd cannelure (412) communicates with said first gas passage (411);

Said air permeable plate (42) is whole rounded, and at its outer rim ring cutting step surface (422) is arranged, and is used to install sealing ring, and said air permeable plate has centre bore on (42), also has some air-vents (421);

Be provided with first sealing gasket (43) between said air permeable plate (42) and the check valve valve body (41),, realize that said gas outlet is communicated with first gas passage (411) selectivity through the motion of said first sealing gasket (43).

6. bypass valve according to claim 4; It is characterized in that: in the installing space of forming by said second gas passage (21), first cavity (11), the 3rd gas passage (13), be provided with spool (3); Said spool (3) is provided with second sealing gasket (35); Said second sealing gasket (35) is positioned between first boss (23) and second boss (16); Through moving up and down of said second sealing gasket (35), realize that first cavity (11) is communicated with second gas passage (21), the 3rd gas passage (13) selectivity.

7. bypass valve according to claim 5; It is characterized in that: said first sealing gasket (43) comprises integrated disc portions (431) and rod member part (432); Said rod member part (432) is arranged on the center of said integrated disc portions (431), and said first sealing gasket (43) is installed between said air permeable plate (42) and the check valve valve body (41), so that said rod member part (432) is passed said centre bore; And the length of said rod member part (432) is greater than the thickness of said air permeable plate (42); Said rod member part (432) outer end is provided with limited cap (433), so that said first sealing gasket (43) does not fall off in said air permeable plate (42), when said integrated disc portions (431) is adjacent to said air permeable plate (42); Be blocked said gas outlet and said first gas passage (411) blocking-up between said air-vent (421) and said the 3rd cannelure (412).

8. bypass valve according to claim 6 is characterized in that: said spool (3) comprises gland (31), upper spring (32), valve rod (33), the lower spring (34) that links to each other successively from top to bottom;

Said gland (31) upper end has first convexity (311); Corresponding said first convexity (311) inwardly is provided with second convexity (22) in the upper end of said valve gap (2); Said second convexity (22) is positioned at the import department of said second gas passage (21); Through cooperating of said first convexity (311) and second convexity (22), said gland (31) is limited in said second gas passage (21), said gland (31) is whole cylindrical; At its peripheral evenly rip cutting four straight flanges, and leave circular arc guide part (313) in the center of straight flange.

9. bypass valve according to claim 7; It is characterized in that: the external diameter of said integrated disc portions (431) is less than the internal diameter of said the 3rd cannelure (412); Be provided with the spacing preiection (413) of some said integrated disc portions in said the 3rd cannelure (412); Said the 3rd cannelure (412) is communicated with said first gas passage (411), and gives vent to anger through being threaded with pipe joint (6) in the outer end of said first gas passage (411).

10. bypass valve according to claim 8; It is characterized in that: said gland (31) bottom centre extends upward and has mounting groove (312); And said mounting groove (312) oral area of going up falls filleted corner; Said valve rod (33) top center has down mounting groove (331) to extending below, and said upper spring (32) one ends are installed in the mounting groove (312), and the other end is installed in down in the mounting groove (331);

Said valve rod (33) middle part is provided with annular solid (332); Said annular solid (332) top has the conical surface; The lower surface of being close to said annular solid (332) has the second sealing gasket mounting groove (333) on said valve rod (33); Said second sealing gasket (35) is installed on the said valve rod (33) through the second sealing gasket mounting groove (333); Said lower spring (34) is enclosed within periphery, said valve rod (33) bottom, and an end places in said the 3rd gas passage (13), and the other end contacts the lower surface of said second sealing gasket (35).