CN105736785A

CN105736785A - Selector valve

Info

Publication number: CN105736785A
Application number: CN201610256361.1A
Authority: CN
Inventors: 沈云奇; 夏忠星; 仇领光
Original assignee: NINGBO SUNAN VALVE MANUFACTURE CO Ltd
Current assignee: NINGBO SUNAN VALVE MANUFACTURE CO Ltd
Priority date: 2016-04-21
Filing date: 2016-04-21
Publication date: 2016-07-06
Anticipated expiration: 2036-04-21
Also published as: CN105736785B

Abstract

The invention discloses a selector valve. A control component comprises a first air pipe, a second air pipe, a piston rod sleeve and a control valve, a partition area is formed in the middle of a pressing cap, a piston rod and an inner hole of the partition area are in sliding fit, the piston rod and the piston rod sleeve are slidably connected in the pressing cap on two sides of the partition area respectively, a cavity between one end of the partition area and a step face of the piston rod is a first air chamber, a cavity between the other end of the partition area and an end face of the piston rod sleeve is a second air chamber, the control valve is mounted at the top of a valve body, an air inlet of the control valve is communicated with an air inlet in the valve body, the control valve is provided with two air outlets, a first air outlet is communicated with the first air chamber through a first air pipe, a second air outlet is communicated with the second air chamber through a second air pipe, and a valve core component for opening and closing the first air outlet is arranged in the control valve. After adopting the structure, the selector valve is higher in sealability, deformation of the piston rod is avoided, and normal working of the selector valve is guaranteed.

Description

Selector valve

Technical field

The present invention relates to the technical field of valve, be especially a kind of for the selector valve playing open close valve function in fire-fighting fire extinguishing gas long-distance sand transport system.

Background technology

Selector valve is a vitals in gas extinguishing system, is arranged between manifold trunk and guard plot fire extinction pipeline, is used for controlling the break-make of fire-fighting fire extinguishing gas long-distance sand transport.In combination distribution fire extinguishing system, each guard plot must be equipped with a corresponding selector valve, when guard plot has fire signal to send, the fire-extinguishing bottle corresponding with guard plot is activated, gas is along starting the container value that pipe is opened on corresponding selector valve and fire-extinguishing bottle successively, being discharged by extinguishing chemical, extinguishing chemical arrives manifold trunk along high-pressure hose, arrives again through selector valve in the guard plot of corresponding breaking out of fire and puts out a fire.

The selector valve of prior art, as shown in accompanying drawing 1～accompanying drawing 3, it includes having the valve body 03 of air inlet 01 and gas outlet 02, piston rod 04, pressure cap 011 and by driving Component driver piston rod 04 for opening and closing the cylinder 05 of valve.One end of piston rod 04 is slidably fitted in valve body 03 and forms the valve for break-make air inlet 01 and gas outlet 02 with valve body 03, and the other end is slidably connected in pressure cap 011, and pressure cap 011 is connected on valve body 03.Assembly is driven to include pressure arm 09, holding screw 010, handle 08, rotating shaft 07, pivoted arm 06 and spring leaf 012；One end of pressure arm 09 is rotatably connected on pressure cap 011, the other end is step end, one end of spring leaf 012 is connected on pressure cap 011, and the other end is pushed against the step bottom portion of pressure arm 09, and the step end of pressure arm 09 is upspring by spring leaf 012 by the half-round position locking in rotating shaft 07 or disengagement；Holding screw 010 is threaded in pressure arm 09, and the upper surface of the lower end of holding screw 010 and piston rod 04 compresses or disengages；Handle 08 and pivoted arm 06 are both connected in rotating shaft 07, and the lower end of pivoted arm 06 pushes against with the piston rod free end in cylinder 05.

The operation principle of above-mentioned this selector valve is: during work, pushed pivoted arm 06 by piston rod in cylinder 05 to rotate, thus driving rotating shaft 07 to rotate counterclockwise, or pulled rotating shaft 07 by handle 08 to rotate counterclockwise, the active force being pressed in pressure arm 09 step end is unclamped at the semicircle position of rotating shaft 07, elastic force effect hold 09 at spring leaf 012 is provided with the trend rotated counterclockwise, holding screw 010 is made to lose the pressure to piston rod 04 end, piston rod 04 moves up under the effect of air inlet 01 internal pressure differences simultaneously, thus opening valve, gas from air inlet 01 through flow direction valve gas outlet 02；After completing work, then need, piston rod 04 head pressure pressure pressure arm 09 simultaneously, to overcome the elastic force effect of spring leaf 012, make the step end of pressure arm 09 realize auto lock after entering the semicircle position of rotating shaft 07, close valve.

But, the selector valve of above-mentioned this structure there is the problem that

1) due to the gas with pressure full in valve body, under this pressure effect, holding screw holds out against the top of piston rod then can easily cause piston rod part deformation, piston rod, once deformation, can affect the interior interporal lacuna of the pressure cap being slidably matched with it, the open and close ultimately causing valve are all extremely difficult, even cause the phenomenon that valve is stuck, make the selector valve cannot normal operation；

2) nominal operating pressure of valve is more big, act on the power on the piston rod in valve more big, same purpose is also more big at the active force suffered by the pressure arm of piston rod part, therefore the problem brought is: first, the bearing pin at the place of being rotationally connected of pressure arm and pressure cap and the rotating shaft that the step end of pressure arm is locked on pressure cap being all easily deformed；Second, it is necessary to during valve opening, in order to open the locking active force of pressure arm step end and rotating shaft semicircle position, then the active force needing to act on handle is bigger, or the cylinder specification installed is bigger, then operating difficulties, cost are high；

3) nominal operating pressure of valve is more big, piston rod is under the effect of air inlet gases at high pressure, moment at valve opening, the snap action that piston rod slides in pressure cap is fierce, make the reversion impulse force acting on pressure arm more big, thus being present in unsafe hidden danger, and piston rod have impact on sealing property when valve upper is once closed under clashing into fiercely；

4) additionally, after having worked, pressure arm is also depressed while needing piston rod part to depress, so just can overcome the effect of the torsion spring connected on the elastic force effect of spring leaf and pivoted arm, the step end that just can make pressure arm enters the semicircle position of rotating shaft and realizes locking, just can close the door valve, therefore, troublesome poeration, effort.

Summary of the invention

The technical problem to be solved is to provide that a kind of valve opening is light, the selector valve of action safety and precise.

For solving above-mentioned technical problem, selector valve provided by the invention, including inside, there is the control assembly that the valve body of air inlet and gas outlet, step-like piston rod, pressure cap and application valve body inner valve open and close, piston rod is slidably connected in valve body, and one end of piston rod forms valve with valve body, the other end is connected with pressure cap, and pressure cap is connected on valve body；It is characterized in that: described control assembly includes the first trachea, the second trachea, piston rod sleeve and control valve；The axis horizontal of piston rod is arranged, and pressure cap is connected to the side of valve body；The endoporus in the middle part of described pressure cap with exclusion region, piston rod and exclusion region is slidably matched；Piston rod and piston rod sleeve are slidably connected in the pressure cap of exclusion region both sides respectively, and the chamber between exclusion region one end and piston rod step face is the first air chamber, and the chamber between the exclusion region other end and piston rod sleeve end face is the second air chamber；Control valve and be arranged on the top of valve body, and control the air inlet of valve to communicate with the air inlet in valve body, control valve and there are two gas outlets, wherein first gas outlet the first trachea and the connection of the first air chamber, second gas outlet the second trachea and the connection of the second air chamber, control to be provided with the valve inside assembly for break-make the first gas outlet in valve.

Described control valve includes base, joint body, upper valve inside, lower valve inside and sealing plug, base lower end is fixedly connected on the top of valve body, the lower end of joint body is connected to the upper end of base, sealing plug is connected to bottom the joint body in base, there is in joint body valve pocket, upper valve inside and lower valve inside are push against state up and down to be slidably fitted in valve pocket, the joint body of upper valve inside and valve pocket upper end forms valve, lower valve inside lower end be positioned at sealing plug deep gouge and with deep gouge bottom formation lower valve.

The lower end of described lower valve inside is provided with the little spring with reset response, and the deep gouge bottom land of the lower end of little spring and sealing plug pushes against, and upper end pushes against with the shaft shoulder on lower valve inside.

Described piston rod includes the valve portion being connected as a single entity successively, the first sliding part, the second sliding part and the connecting portion that are gradually reduced in step-like diameter；Described valve portion and valve body form valve, and the first sliding part is slidably connected in pressure cap and is positioned at the side of exclusion region, and the second sliding part and exclusion region are slidably matched, and connecting portion is in the opposite side of exclusion region and fixing with piston rod sleeve is connected.

The first described sliding part and be provided with the big spring with reset response between step surface and the end face of pressure cap exclusion region of the second sliding part junction, one end of big spring and the end face of exclusion region push against, and the other end is connected in the groove on step surface.

Having the 3rd air chamber bottom described joint body and between the mounting groove bottom land of base, and base is provided with the first gas passage, the two ends of the first gas passage are respectively communicated with the air inlet in the 3rd air chamber and valve body；The first described gas outlet and the second gas outlet are respectively arranged on the both sides of joint body, and the first gas outlet connects with valve pocket, and the second gas outlet is by the second gas passage on joint body and the connection of the 3rd air chamber；Having air vent on described joint body, this air vent is connected with valve pocket by upper valve or is disconnected.

The the first described air chamber pressure cap sidewall near exclusion region end is provided with the 3rd gas passage being radially arranged, and the 3rd gas passage is connected by joint and the first trachea；The the second described air chamber pressure cap sidewall near exclusion region end is provided with the 4th gas passage being radially arranged, and the 4th gas passage is connected by joint and the second trachea.

The end that described piston rod forms valve with valve body includes sealing gasket and sealing gasket shrouding, and the end of piston rod has the seal groove of accommodating sealing gasket, and sealing gasket shrouding is fixing with piston rod to be connected and is fixed in seal groove by sealing gasket；The valve body at valve place is provided with boss, and during valve closing, sealing gasket end face and raised head face push against, and during valve opening, sealing gasket end face disengages with raised head face.

The notch place of described seal groove is provided with the annular stop bar prominent to axis direction.

After adopting above structure, the present invention compared with prior art, has the advantage that

1) owing to valve body inner piston rod is in being horizontally disposed with, its opening and closing of valve formed with valve body be sealed into axial end face seal, simultaneously in air inlet under the effect of gas pressure, add power on the piston rod being pressed in valve place and increase, therefore, the better tightness at valve place；Avoid the deformation of piston rod, it is ensured that the normal operation of selector valve simultaneously；

2) when opening valve, only just need to can back down valve inside by only small power at the joint body place of control valve, simultaneously close off lower valve inside, after in the gas in the first air chamber is by the first trachea, control the first gas outlet of valve, valve pocket and air vent exits valve body, gas pressure in first air chamber declines, thus opening valve；Therefore, the nominal operating pressure of tube valve does not have much, and the unlatching of valve is all very easily, flexibly, easy to operate, it is not necessary to increase the specification of related components, thus lower in cost；

3) between piston rod and pressure cap, it is provided with big spring, makes the movement of piston rod be provided with cushioning effect, thus piston rod moves suddenly under the effect of gas pressure difference when preventing valve from opening, it is ensured that the safety of piston rod movement；And after hours, piston rod automatic-closing valve under the effect of big spring, it is not necessary to adjust and reset；

4) seal groove structure of piston rod valve portion, makes sealing gasket to be more securely arranged in seal groove, it is to avoid occur skew to affect sealing property.

Accompanying drawing explanation

Fig. 1 is the structural representation of selector valve in prior art.

Fig. 2 is the structural representation in A-A direction in Fig. 1.

Fig. 3 is the structural representation in B direction in Fig. 1.

Fig. 4 is the structural representation of selector valve of the present invention.

Fig. 5 is the structural representation in C direction in Fig. 4.

Fig. 6 is the structure for amplifying schematic diagram controlling valve in selector valve of the present invention.

Fig. 7 is the structure for amplifying schematic diagram at D place in Fig. 4.

Wherein:

Prior art: 01, air inlet；02, gas outlet；03, valve body；04, piston rod；05, cylinder；06, pivoted arm；07, rotating shaft；08, handle；09, pressure arm；010, holding screw；011, pressure cap；012, spring leaf；

The present invention: 1, air inlet；2, gas outlet；3, valve body；4, sealing gasket shrouding；5, sealing gasket；6, piston rod；6-1, valve portion；6-2, the first sliding part；6-3, the second sliding part；6-4, connecting portion；7, big spring；8, pressure cap；9, piston rod sleeve；10, the first air chamber；11, the second air chamber；12, the 3rd gas passage；13, the 4th gas passage；14, the first trachea；15, the second trachea；16, the first gas outlet；17, the second gas outlet；18, air vent；19, base；20, sealing plug；21, joint body；22, little spring；23, lower valve inside；24, upper valve inside；25, the 3rd air chamber；26, the first gas passage；27, the second gas passage；28, deep gouge；29, valve pocket；30, seal groove；31, annular stop bar；32, boss；33, exclusion region.

Detailed description of the invention

Below in conjunction with the drawings and specific embodiments, the present invention is described in more detail.

The structural representation of the selector valve of the present invention shown in Fig. 4～Fig. 7, it includes inside and has the control assembly that the valve body 3 of air inlet 1 and gas outlet 2, step-like piston rod 6, pressure cap 8 and application valve body 3 inner valve open and close, piston rod 6 is slidably connected in valve body 3, and one end of piston rod 6 and valve body 3 form valve, the other end is connected with pressure cap 8, and pressure cap 8 is connected on valve body 3.Described control assembly includes first trachea the 14, second trachea 15, piston rod sleeve 9 and controls valve；The axis horizontal of piston rod 6 is arranged, and pressure cap 8 is connected to the side of valve body 3.Having exclusion region 33 in the middle part of described pressure cap 8, the endoporus of piston rod 6 and exclusion region 33 is slidably matched.Piston rod 6 and piston rod sleeve 9 are slidably connected in the pressure cap 8 of exclusion region 33 both sides respectively, and the chamber between exclusion region 33 one end and piston rod 6 step surface is the first air chamber 10, the chamber between exclusion region 33 other end and piston rod sleeve 9 end face is the second air chamber 11.Control valve and be arranged on the top of valve body 3, and the air inlet controlling valve communicates with the air inlet in valve body 3, control valve and there are two gas outlets, wherein the first gas outlet 16 connects with the first air chamber 10 through the first trachea 14, second gas outlet 17 connects with the second air chamber 11 through the second trachea 15, controls to be provided with the valve inside assembly for break-make the first gas outlet 16 in valve.

Described control valve includes base 19, joint body 21, upper valve inside 24, lower valve inside 23 and sealing plug 20, base 19 lower end is fixedly connected on the top of valve body 3, the lower end of joint body 21 is connected to the upper end of base 19, sealing plug 20 is connected to bottom the joint body 21 in base 19, in joint body 21, there is valve pocket, upper valve inside 24 and lower valve inside 23 are push against state up and down to be slidably fitted in valve pocket 29, upper valve inside 24 forms upper valve with the joint body 21 of valve pocket 29 upper end, lower valve inside 23 lower end be positioned at sealing plug 20 deep gouge 28 and with deep gouge 28 bottom formed lower valve.

The lower end of described lower valve inside 23 is provided with deep gouge 28 bottom land of the little spring 22 with reset response, the lower end of little spring 22 and sealing plug 20 and pushes against, and upper end pushes against with the shaft shoulder on lower valve inside 23.

Described piston rod 6 includes being the valve portion 6-1 being connected as a single entity successively, the first sliding part 6-2, the second sliding part 6-3 and connecting portion 6-4 that step-like diameter is gradually reduced.Described valve portion 6-1 and valve body 3 form valve, first sliding part 6-2 is slidably connected in pressure cap 8 and is positioned at the side of exclusion region 33, second sliding part 6-3 and exclusion region 33 are slidably matched, and connecting portion 6-4 is positioned at the opposite side of exclusion region 33 and fixing with piston rod sleeve 9 is connected.

6-2's and the second sliding part 6-3 junction be provided with the big spring 7 with cushioning effect between step surface and the end face of pressure cap 8 exclusion region 33 to the first described sliding part, the end face of one end of big spring 7 and exclusion region 33 pushes against, and the other end is connected in the groove on step surface.

Having the 3rd air chamber 25 bottom described joint body 21 and between the mounting groove bottom land of base 19, and base 19 is provided with the first gas passage 26, the two ends of the first gas passage 26 are respectively communicated with the air inlet 1 in the 3rd air chamber 25 and valve body 3.The first described gas outlet 16 and the second gas outlet 17 are respectively arranged on the both sides of joint body 21, and the first gas outlet 16 connects with valve pocket 29, and the second gas outlet 17 is connected with the 3rd air chamber 25 by the second gas passage 27 on joint body 21；Having air vent 18 on described joint body 21, this air vent 18 is connected with valve pocket 29 by upper valve or is disconnected.

The the first described air chamber 10 pressure cap 8 sidewall near exclusion region 33 end is provided with the 3rd gas passage 12 being radially arranged, and the 3rd gas passage 12 is connected by joint and the first trachea 14.The the second described air chamber 11 pressure cap 8 sidewall near exclusion region 33 end is provided with the 4th gas passage 13 being radially arranged, and the 4th gas passage 13 is connected by joint and the second trachea 15.

The end that described piston rod 6 and valve body 3 form valve includes sealing gasket 5 and sealing gasket shrouding 4, and the end of piston rod 6 has the seal groove 30 of accommodating sealing gasket 5, and sealing gasket shrouding 4 is fixing with piston rod 6 to be connected and is fixed in seal groove 30 by sealing gasket 5.The valve body 3 at valve place is provided with boss 32, and during valve closing, sealing gasket 5 end face and boss 32 end face push against, sealing gasket 5 end face and boss 32 face opening during valve opening.

The notch place of described seal groove 30 is provided with the annular stop bar 31 prominent to axis direction.

In the present embodiment, the top opening being applied on joint body 21 for backing down the upper valve at upper valve inside 24 place can with the various ways such as mechanical, electronic, pneumatic and manual.

The work process of the present invention is as follows:

1, during valve-closed state, gas is under air inlet 1 pressure effect, and a road flows to the second air chamber 11 after first gas passage the 26, the 3rd air chamber the 25, second gas passage the 27, second gas outlet the 17, second trachea the 15, the 4th gas passage 13；Another road through the first gas passage the 26, the 3rd air chamber 25, back down lower valve inside 23 and close and close after valve inside 24 enters valve pocket the 29, first gas outlet the 16, first trachea the 14, the 3rd gas passage 12 and flow to the first air chamber 10；Due in the first air chamber 10 the step surface compression area at piston rod 6 first sliding part 6-2 place more than the compression area of piston rod sleeve 9 in the second air chamber 11, piston rod 6 is made to have the trend moved to the left side that diagram is expressed, so that the sealing surface pressurized at piston rod 6 valve portion 6-1 place, it is ensured that the closed mode of valve.

2, during Open valve, only need to press downwards in joint body 21 upper end, backing down the upper valve at valve inside 24 place and close the lower valve at lower valve inside 23 place, the gas in the first air chamber 10 is discharged from air vent 18 after the 3rd gas passage the 12, first trachea the 14, first gas outlet 16, valve pocket 29, upper valve；Now; gas pressure in first air chamber 10 reduces, and the gas-pressure protection in the second air chamber 11 is constant and creates pressure differential with the first air chamber 10, and piston rod sleeve 9 drives piston rod 6 to move to the right; thus opening valve, gas from air inlet 1 through flow direction valve gas outlet 2.

3, after having worked, valve body external and internal pressure is consistent, and piston rod 6 automatically moves to the left under the effect of big spring 7, until closing valve；Releasable joint body 21 place acts on the active force on valve inside 24 simultaneously, enters readiness for operation next time.

The above; it it is only the enforcement example that the present invention is preferably feasible; therefore the interest field of the present invention can not namely be limited to; other various corresponding changes that those of ordinary skill in the art, all utilization technical schemes and technology design are made all should belong within the protection domain of the claims in the present invention.

Claims

1. a selector valve, including inside, there is the control assembly that the valve body (3) of air inlet (1) and gas outlet (2), step-like piston rod (6), pressure cap (8) and application valve body (3) inner valve open and close, piston rod (6) is slidably connected in valve body (3), and one end of piston rod (6) forms valve with valve body (3), the other end is connected with pressure cap (8), and pressure cap (8) is connected on valve body (3)；It is characterized in that: described control assembly includes the first trachea (14), the second trachea (15), piston rod sleeve (9) and controls valve；The axis horizontal of piston rod (6) is arranged, and pressure cap (8) is connected to the side of valve body (3)；Described pressure cap (8) middle part has the endoporus of exclusion region (33), piston rod (6) and exclusion region (33) and is slidably matched；Piston rod (6) and piston rod sleeve (9) are slidably connected in the pressure cap (8) of exclusion region (33) both sides respectively, and the chamber between exclusion region (33) one end and piston rod (6) step surface is the first air chamber (10), the chamber between exclusion region (33) other end and piston rod sleeve (9) end face is the second air chamber (11)；Control valve and be arranged on the top of valve body (3), and the air inlet controlling valve communicates with the air inlet in valve body (3), control valve and there are two gas outlets, wherein the first gas outlet (16) connect with the first air chamber (10) through the first trachea (14), second gas outlet (17) connects with the second air chamber (11) through the second trachea (15), controls to be provided with the valve inside assembly for break-make the first gas outlet (16) in valve.

null2. selector valve according to claim 1，It is characterized in that: described control valve includes base (19)、Joint body (21)、Upper valve inside (24)、Lower valve inside (23) and sealing plug (20)，Base (19) lower end is fixedly connected on the top of valve body (3)，The lower end of joint body (21) is connected to the upper end of base (19)，Sealing plug (20) is connected to joint body (21) bottom in base (19)，There is in joint body (21) valve pocket (29)，Upper valve inside (24) and lower valve inside (23) are push against state up and down to be slidably fitted in valve pocket (29)，Upper valve inside (24) and valve in joint body (21) formation of valve pocket (29) upper end，Lower valve inside (23) lower end is positioned at the deep gouge (28) of sealing plug (20) and forms lower valve with deep gouge (28) bottom.

3. selector valve according to claim 2, it is characterized in that: the lower end of described lower valve inside (23) is provided with the little spring (22) with reset response, deep gouge (28) bottom land of the lower end of little spring (22) and sealing plug (20) pushes against, and upper end pushes against with the shaft shoulder on lower valve inside (23).

4. selector valve according to claim 1, it is characterised in that: described piston rod (6) includes the valve portion (6-1) being connected as a single entity successively, the first sliding part (6-2), the second sliding part (6-3) and the connecting portion (6-4) that are gradually reduced in step-like diameter；Described valve portion (6-1) forms valve with valve body (3), first sliding part (6-2) is slidably connected in pressure cap (8) and is positioned at the side of exclusion region (33), second sliding part (6-3) and exclusion region (33) are slidably matched, and connecting portion (6-4) is positioned at the opposite side of exclusion region (33) and fixing with piston rod sleeve (9) is connected.

5. selector valve according to claim 4, it is characterized in that: described the first sliding part (6-2) and be provided with the big spring (7) with cushioning effect between step surface and the end face of pressure cap (8) exclusion region (33) of the second sliding part (6-3) junction, the end face of one end of big spring (7) and exclusion region (33) pushes against, and the other end is connected in the groove on step surface.

6. selector valve according to claim 2, it is characterized in that: between described joint body (21) bottom and the mounting groove bottom land of base (19), there is the 3rd air chamber (25), and base (19) is provided with the first gas passage (26), and the two ends of the first gas passage (26) are respectively communicated with the air inlet (1) in the 3rd air chamber (25) and valve body (3)；Described the first gas outlet (16) and the second gas outlet (17) are respectively arranged on the both sides of joint body (21), and the first gas outlet (16) connect with valve pocket (29), the second gas outlet (17) are connected with the 3rd air chamber (25) by the second gas passage (27) on joint body (21)；Having air vent (18) on described joint body (21), this air vent (18) is connected by upper valve with valve pocket (29) or disconnects.

7. selector valve according to claim 6, it is characterized in that: described the first air chamber (10) pressure cap (8) sidewall near exclusion region (33) end is provided with the 3rd gas passage (12) being radially arranged, the 3rd gas passage (12) is connected by joint and the first trachea (14)；Described the second air chamber (11) pressure cap (8) sidewall near exclusion region (33) end is provided with the 4th gas passage (13) being radially arranged, and the 4th gas passage (13) is connected by joint and the second trachea (15).

8. selector valve according to claim 1, it is characterized in that: the end that described piston rod (6) forms valve with valve body (3) includes sealing gasket (5) and sealing gasket shrouding (4), the end of piston rod (6) has the seal groove (30) of accommodating sealing gasket (5), and sealing gasket shrouding (4) is fixing with piston rod (6) to be connected and is fixed in seal groove (30) by sealing gasket (5)；The valve body (3) at valve place is provided with boss (32), during valve closing, sealing gasket (5) end face and boss (32) end face push against, sealing gasket (5) end face and boss (32) face opening during valve opening.

9. selector valve according to claim 8, it is characterised in that: the notch place of described seal groove (30) is provided with annular stop bar (31) prominent to axis direction.