TW201437522A - Bi-directional valve - Google Patents

Abstract

A bi-directional valve comprises a bearing which includes an installation space with a first valve plate abutted by a first spring and a second valve plate abutted by a second spring at the interior. When the first valve plate is absorbed by the force greater than the elastic force of the first spring, the first valve plate presses the first spring to displace and be isolated from the second valve plate to achieve the conduct of the bi-direction valve. When the second valve plate receives the pressure greater than the elastic force of second spring, the second valve plate displaces to achieve the conduct of the bi-direction valve. So that the bi-directional valve of the present invention can adjust the conduct ways based on the variance of the pressure.

Description

Two-way valve

The present invention relates to a two-way valve, and more particularly to a two-way valve that automatically adjusts the position of the inner valve piece according to the pressure change on both sides of the valve to further control the direction in which the fluid can pass.

Generally, vehicles such as cars or locomotives are equipped with fuel tanks for storing gasoline or diesel fuel. The fuel tanks are provided with a fuel filler nozzle. Gasoline or diesel oil can be added to the fuel tank by a fuel filler nozzle. In addition, a lock device is also provided at the fuel filler nozzle of the fuel tank. The capping device comprises a body fixed around the fueling nozzle, and an oil cap detachably coupled with the seat body, the oil cap is used for sealing the fueling nozzle, so that the fuel in the fuel tank or the material outside the fuel tank is not easily Enter and exit the fuel tank.

The pressure inside the fuel tank will change depending on the environment in which the vehicle is located or the engine. In detail, for example, the vehicle is heated by the sun in the stopped state, and the internal pressure is increased due to the temperature increase. Or when the vehicle is running, the fuel tank will generate negative pressure due to the reduction of internal fuel. The negative pressure will cause suction inside the fuel tank, so the fuel is less likely to flow to the engine, and the engine oil supply is not smooth. To this end, the oil cap is usually provided with a small hole, so that the fuel tank can communicate with the outside of the fuel tank to maintain the balance between the internal pressure of the fuel tank and the external pressure, so that the fuel tank can supply oil to the engine smoothly.

In this normal state, the oil cap with the small hole will be continuously lost in the small hole of the oil tank, and when the vehicle falls over, the fuel will easily flow out from the small hole of the oil cover, resulting in a fire burning. risk.

To solve this problem, the present invention provides a two-way valve comprising a socket, the socket comprising a body, the body comprising a first surface and a second surface, the socket further comprising a connecting tube formed on the second surface The seat further includes a mounting space formed on the first surface, the mounting space including a first slot extending from the first surface toward the second surface but spaced apart from the second surface, by the first a second groove extending from the bottom surface of the groove toward the second surface but spaced apart from the second surface, a third groove formed on the bottom surface of the second groove, and a fourth groove formed on the bottom surface of the third groove, the fourth groove The utility model has a bottom surface, the installation space further comprises a first step surface formed at the boundary between the third groove and the fourth groove, and a second step surface formed at the boundary between the second groove and the third groove, the socket further comprises a first valve piece movably mounted in the third slot, the first valve piece including a first side surface and a second side surface facing the first step surface, wherein a passage extending from the end surface of the connecting tube to the fourth slot is movably mounted a first spring is mounted between the bottom surface of the fourth groove of the socket and the first valve piece, the first spring is oppositely biased with the first valve piece, and a second valve piece movably mounted in the second groove The second valve piece includes a first end surface and a second end surface facing the first step surface, the second valve piece further includes a through hole, and the second valve piece is along the second groove in the first position and the second position Between the displacement, a lock cover fixed on the socket, the lock cover has a first end surface and a second end surface, and the lock cover is further included a vent hole extending from the first end surface to the second end surface, a sealing ring sealingly coupled between the first groove and the second end surface of the lock cover, and coupled between the lock cover and the first end surface of the second valve piece a second spring biasing the second valve plate in the first position.

When the first valve piece is not subjected to an external force other than the first spring and the second valve piece is not subjected to an external force other than the second spring, the first valve piece is biased by the first spring, so that the first side surface is closely abutted against a second end surface of the second valve piece, the perforation is closed, and the second valve piece is biased by the second spring in the first position, so that the second end surface is closely abutted against the first step surface, and the third and the third The four slots are closed.

When the suction force applied to the first valve sheet is greater than the spring force of the first spring, the first valve plate compresses the first spring displacement such that the first side surface is disengaged from the second end surface of the second valve sheet to open the perforation.

When the pressure applied to the second valve plate is greater than the spring force of the second spring, the second valve plate compresses the second spring from the first position to the second position to disengage the second end surface from the first step.

The two-way valve of the present invention can automatically adjust the position of the first or second valve plate according to the pressure change of the first valve piece or the pressure near the second valve piece, thereby achieving the effect of automatically controlling the closing or conducting of the two-way valve.

12‧‧‧Two-way valve

197‧‧‧First spring

199‧‧‧shims

211‧‧‧bond hole

212‧‧‧Circle wall

213‧‧‧First valve

215‧‧‧ first side

217‧‧‧ second side

219‧‧‧Bump

231‧‧‧Second valve

233‧‧‧ first end face

235‧‧‧second end face

237‧‧‧ binding column

239‧‧‧Perforation

251‧‧‧shims

253‧‧‧Combination hole

254‧‧‧ ring wall

255‧‧‧Second spring

257‧‧‧Seal ring

259‧‧‧Lock cover

260‧‧‧ outer ring wall

271‧‧‧ first end face

273‧‧‧second end face

275‧‧‧ ring wall

276‧‧‧End face

277‧‧ ‧ room

278‧‧‧vents

280‧‧‧ Groove

281‧‧‧ Extension tube

283‧‧‧Lock ear

400‧‧ ‧ socket

410‧‧‧ Ontology

411‧‧‧ first surface

412‧‧‧ second surface

413‧‧‧Connecting tube

414‧‧‧ channel

414A‧‧‧Constriction

415‧‧‧ installation space

417‧‧‧ first slot

419‧‧‧second trough

431‧‧‧ third slot

433‧‧‧fourth slot

434‧‧‧ bottom

435‧‧‧ first step

436‧‧‧ channel

437‧‧‧ second stage

439‧‧‧ lugs

451‧‧‧ fuel tank

453‧‧‧ gas pipeline

455‧‧‧ screws

457‧‧‧ steel balls

459‧‧‧ 塞子

471‧‧‧through hole

The first figure is an exploded perspective view of the two-way valve of the creation.

Figure 2 is a cross-sectional view of the inventive two-way valve.

Fig. 3 is a view showing a state in which the first valve piece and the second valve piece of the two-way valve are separated from each other.

Fig. 4 is a view showing a state in which the second valve piece of the creative two-way valve is displaced from the first position to the second position.

Fig. 5 is a view showing a state in which the second valve piece of the creative two-way valve is in the second position and the first valve piece is spaced apart from the second valve piece.

Figure 6 is a state diagram of the creation of the two-way valve directly mounted on the fuel tank.

Fig. 7 is a state diagram of the creation of the two-way valve installed between the gas pipes of the township.

Fig. 8 is a view showing a state in which the steel ball is blocked in the passage of the seat after the two-way valve is turned in the state shown in Fig. 2.

All of the following drawings are merely illustrative of the basic teachings of the present invention, and the extension of the number, position, relationship, and size of the components constituting the preferred embodiment will be explained in the drawings. Post-guided changes are implemented in industry skills. In addition, changes in the exact dimensions and size ratios associated with specific strengths, weights, strengths, and similar requirements are also within the skill of the industry after reading and understanding the teachings of this creation.

In the different figures, the same reference numerals are used to designate the same or similar elements; in addition, please refer to the text such as "first", "second", "third", "upper", "lower", "before", "after" , "inside", "outside", "end", "part", "segment", "horizontal", "vertical", "inward", "outward", "twist", "length", "zone" "," "around", "lateral", "radial", "axial", and the like, are merely used to facilitate the construction of the reference figure and to merely describe the creation.

According to the drawings, the two-way valve 12 includes a socket 400. The socket 400 has a body 410. The body 410 includes a first surface 411 and a second surface 412. The socket 400 further includes a second surface 412. An adapter tube 413 further includes two lugs 439 formed on the outer peripheral surface. The socket 400 further includes a mounting space 415 formed on the first surface 411. The mounting space 415 includes a first surface 411 toward the second surface 412. A first slot 417 extending but spaced apart from the second surface 412, a second slot 419 extending from the bottom surface of the first slot 417 toward the second surface 412 but spaced apart from the second surface 412 is formed in the second slot 419 a third slot 431 of the bottom surface to And a fourth groove 433 formed on the bottom surface of the third groove 431, the fourth groove 433 has a bottom surface 434, and the installation space 415 further includes a first step surface 435 formed at the boundary between the third groove 431 and the fourth groove 433. And a second step 437 formed at a boundary between the second groove 419 and the third groove 431, the fourth groove 433 including a plurality of grooves formed on the inner circumferential surface and extending between the bottom surface 434 and the first step surface 435 Channel 436, a passage 414 extends from the end of the adapter tube 413 to the bottom surface 434 of the fourth slot 433, and the passage 414 includes a tapered section 414A adjacent the bottom surface 434.

A first valve piece 213 made of rubber, a second valve piece 231 made of rubber, a first spring 197, a second spring 255, and a metal two-shield 199 are disposed in the installation space 415 of the socket 400. The second valve piece 213 includes a first side surface 215 and a second side surface 217 facing the first step surface 435. The first valve piece 213 further includes a protrusion 219 formed on the second side surface 217. A valve piece 213 is movably mounted in the third groove 431. The spacer 199 is combined with the first valve piece 213. The spacer 199 has a coupling hole 211, and a peripheral wall of the spacer 199 forms a ring wall 212. The protrusion 219 is engaged with the coupling hole 211 of the spacer 199 to make the spacer. 199 is located on the second side 217 of the first valve piece 213. The outer diameter of the ring wall 212 of the spacer 199 is slightly smaller than the inner diameter of the third groove 431, and the ring wall 212 is used to keep the first valve piece 213 in contact with The position where the central axis of the third groove 431 is aligned. The first spring 197 is mounted in the fourth slot 433 and both ends abut against the bottom surface 434 and the surface of the spacer 199, respectively. The metal spacer 199 has better rigidity, so the first spring 197 is pushed through the bias pad 199. The first valve piece 213 can prevent the first valve piece 213 from being deformed by being biased by the first spring 197, so that the first valve piece 213 has a better adhesion effect.

The second valve piece 231 includes a first end surface 233 and a second end surface 235 facing the first step surface 435. The second valve sheet 231 includes a coupling post 237 formed on the first end surface 233, and the second valve sheet 231 further includes A second end surface 235 extends to a through hole 239 of the end surface of the coupling post 237, the second valve piece 231 is movably mounted in the second groove 419, and the second valve piece 231 can follow the second groove 419 in the first position. Displacement with the second position, when the second valve piece 231 is in the first position (as shown in FIG. 2), the second end surface 235 is closely attached to the first step surface 435, and the second valve Slice 231 is in second place At the time of setting (as shown in FIG. 4), the second end surface 235 is spaced apart from the first step surface 435. The spacer 251 is coupled to the second valve piece 231. The center of the spacer 251 has a coupling hole 253, and a peripheral wall of the spacer 251 forms a ring wall 254. The coupling post 237 of the second valve piece 231 is fitted to the coupling hole 253. The spacer 251 is located on the first end surface 233, the outer diameter of the annular wall 254 of the spacer 251 is slightly smaller than the inner diameter of the second slot 419, and the annular wall 254 is used to keep the second valve piece 231 in the same The position of the center axis of the two slots 419 is aligned.

According to the drawings, the two-way valve 12 further includes a lock cover 259 fixed to the socket 400. The lock cover 259 has a first end surface 271 and a second end surface 273. The lock cover 259 further includes a second end surface. An outer ring wall 260 of 273 and a ring wall 275 (shown in FIG. 2) formed on the second end face 273 and located inside the outer ring wall 260, the lock cover 259 also includes two locks formed on the outer ring wall 260. The locking lug 275 has a distal end surface 276. The end surface 276 defines four recesses 280. The inner side of the annular wall 275 defines a chamber 277 communicating with the recess 280. The locking cover 259 is further included by the first An extension tube 281 protruded from the end surface 271, and a vent hole 278 extends from the end of the extension tube 281 to the second end surface 273. The second end surface 273 of the lock cover 259 abuts against the first surface 411 of the socket 400 (as shown in FIG. 2), and the outer ring wall 260 of the lock cover 259 is attached to the outside of the body 410 of the socket 400, and each lock The lug 283 is aligned with the lugs 439 of the socket 400 and is respectively locked by two screws 455. The end of the ring wall 275 is located in the first slot 417 of the socket 400, the second end surface 273 of the locking cover 259 and the first slot. A sealing ring 257 is disposed between the 417, and the sealing ring 257 is located outside the ring wall 275, so that the second end surface 273 of the locking cover 259 is in close contact with the first groove 417, so that the first groove 417 can only pass through the vent hole 278 and the lock cover. 259 external connectivity.

The second spring 255 is mounted in the chamber 277 of the lock cover 259, and the elastic force of the second spring 255 is greater than the first spring 197. The two ends of the second spring 255 abut against the surface of the second end surface 273 and the spacer 251, respectively. The second spring 255 is pressed against the second valve piece 231 through the metal gasket 251. Since the rigidity of the spacer 251 is better, the second valve piece 231 can be prevented from being deformed by the second spring 255, so that the second valve The sheet 231 can have a better adhesion effect to the first step surface 435. Furthermore, the elasticity of the second spring 255 is greater than the first spring 197, such that the first valve plate 213 can be supported by the first spring 197 such that The first side 215 abuts against the second end surface 235 of the second valve piece 231 (as shown in FIG. 2), and the second spring 255 can elastically hold the second valve piece 231 in the first position.

According to the drawings, the two-way valve 12 further includes a steel ball 457 and a plug 549, wherein the steel ball 457 is received in the passage 414 of the socket 400, and the steel ball 457 can be displaced within the passage 414, and the plug 459 includes one end surface thereof. A through hole 471 extending to the other end surface, the plug 459 is screwed in the passage 414 and located at the connecting tube 413 to prevent the steel ball 457 from coming off the passage 414 of the socket 400, and the through hole 471 of the plug 459 causes the passage 414 of the socket 400 to The outside world is connected.

For convenience of explanation, it is assumed that the two-way valve 12 of the present invention is disposed on a fuel tank 451. As shown in FIG. 6, the two-way valve 12 of the present invention can be fixed to the oil tank 451 by the connecting pipe 413 of the socket 400, resulting in a fuel tank. The interior space of the 451 is in communication with the passage 414 of the socket 400. Alternatively, the two-way valve 12 of the present invention can also be disposed between the gas lines 453 of the oil tank 451. Referring to FIG. 7, the extension tube 281 of the lock cover 259 of the two-way valve 12 of the present invention and the adapter tube 413 of the socket 400 are shown. They are respectively coupled to a gas line 453 of the oil tank 451, and the joint pipe 413 combined with the socket 400 faces the oil tank 451.

Since the two-phase valve 12 of the present invention is combined with the oil tank 451 in the manner assumed in Fig. 6, or combined with the oil tank 451 in the manner assumed in Fig. 7, the operation of the two-way valve 12 is the same, so the following description will be It also applies to the states shown in Figures 6 and 7. At the beginning, the pressure inside the oil tank 451 is substantially equal to the atmospheric pressure, the first valve piece 213 is biased only by the first spring 197, and the second valve piece 231 is biased only by the second spring 255, and because the second spring 255 The elastic force is greater than the first spring 197, causing the second valve piece 231 to remain in the first position, the second end surface 235 of the second valve piece 231 abuts against the second step surface 437 to close the third groove 431, and the first valve The first side surface 215 of the sheet 213 abuts against the second end surface 235 of the second valve piece 231, such that the through hole 239 of the second valve piece 231 is closed by the first valve piece 213, and the two-way valve 12 of the present invention is further The adapter tube 413 of the seat 400 is configured to be substantially perpendicular to the ground, thereby causing the steel ball 457 to be away from the tapered portion 414A of the socket 400 in a normal state, in such a state The two-way valve 12 is in a closed state, and the fuel or oil and gas in the oil tank 451 can only flow to the third tank 431 at the top, and the substances outside the oil tank 451 (such as air) can only flow to the second tank 419 at most, that is, It is said that the first and second valve pieces 213, 231 are sealingly blocked between the second groove 419 and the third groove 431, so that when the vehicle is turned over or dumped, the fuel in the oil tank 451 is less likely to leak through the socket 400. Moreover, the oil and gas in the oil tank 451 is also not easily leaked through the socket 400.

When the fuel in the oil tank 451 is reduced due to the engine operation of the vehicle, the oil tank 451 is in a closed state, causing a negative pressure state inside the oil tank 451 to be less than atmospheric pressure, so that suction inside the fuel tank is generated, and the negative pressure inside the fuel tank is generated. When reaching 10kpa~15kpa, the suction force generated on the first valve piece 213 inside the fuel tank will be sufficient to overcome the elastic force of the first spring 197, so that the first valve piece 213 is attracted by the suction force generated by the oil tank and displaced toward the first step surface 435. Until the ring wall 212 of the spacer 199 abuts against the first step surface 435 (as shown in FIG. 3), the first side surface 215 of the first valve piece 213 and the second end surface of the second valve piece 231 will be at this time. The gaps 235 are separated, causing the perforations 239 of the second valve piece 231 to be turned on. Further, since the spacer 199 is smaller than the third groove 431, the spacer 199 cannot completely cover the first step surface 435 (as shown in FIG. 3), so the third The groove 431 and the fourth groove 433 communicate with each other through the four channels 436. In such a state, the air outside the two-way valve 12 enters the installation space 415 via the vent hole 278, and the air further passes through the second valve piece. The through hole 239 of the 231 enters the third slot 431 The air in the third slot 431 passes through the four slots 436 and passes through the fourth slot 433 and enters the oil tank 451 through the passage 414, so that the air outside the socket 400 can be introduced into the oil tank 451, causing the oil tank 451 to enter. The air balances the internal pressure so that the fuel tank 451 can smoothly supply fuel to the engine. When the negative pressure in the oil tank 451 is reduced to be insufficient to resist the elastic force of the first spring 197, the first valve piece 213 is again biased by the first spring 197 to make the first side surface 215 close to the second valve piece. The second end face 235 of the 231.

When the vehicle is in an unactuated state, the fuel tank may generate high temperature due to exposure to the sun, such that the oil and gas inside the oil tank 451 expands, so that the pressure inside the oil tank 451 will increase, when the positive pressure inside the oil tank 451 is greater than 20 kPa, The pressure inside the oil tank 451 pushes the first and second valve pieces 213, 231 together against the elastic force of the second spring 255. Moving, and the first and second valve plates 213, 231 may produce two different states. Referring to FIG. 4, the first state after the first and second valve plates 213, 231 are pushed by the pressure inside the fuel tank. When the second valve piece 231 is displaced from the first position to the second position, the first side surface 215 of the first valve piece 213 closely closes the second end surface 235 of the second valve piece 231 to close the through hole 239, and the second The second end surface 235 of the valve piece 231 is spaced apart from the first step surface 435, and the spacer 251 abuts against the end surface 276 of the lock cover 259 (as shown in FIG. 4), although the spacer 251 abuts against the lock cover 259. The end face 276, but since the end face 276 is provided with four grooves 280, the chamber 277 remains in communication with the second groove 419. When the second valve piece 231 is in the second position, the pressure inside the oil tank 451 enters the third position. And the fourth grooves 431, 433, through the grooves 280 and the vent holes 278 into the recess 88, and finally released to the outside through the vent 278 to balance the pressure, causing the positive pressure inside the tank to drop.

In the second state after the first and second valve pieces 213, 231 are pushed by the pressure inside the oil tank, although the second valve piece 231 is pushed by the internal pressure of the oil tank to the second position, the first side of the first valve piece 213 The 215 does not abut against the second end surface 235 of the second valve piece 231, so that the through hole 239 of the second valve piece 231 is not closed by the first valve piece 213 (as shown in FIG. 5), and the pressure inside the fuel tank is via the passage. 414 enters the third and fourth slots 431, 433, and then enters the recess 88 through the through hole 239 and the vent hole 278 of the second valve piece 231, and finally releases to the outside through the vent hole 278 to balance the pressure, thereby causing a positive pressure inside the fuel tank. The value drops.

For convenience of explanation, it is further assumed that if the fuel tank 451 is accidentally tipped over, as shown in Fig. 8, after the entire two-way valve 12 is turned over, the steel ball 457 will move to the tapered portion 414A of the retaining seat 400 due to its own weight. Thus, regardless of whether the first valve piece 213 abuts against the second valve piece 231, and regardless of whether the second valve face 231 is in the first or second position, the steel ball 457 has blocked the passage 414, thereby preventing any The fluid passes through the two-way valve 12 to further prevent the problem of leakage of gasoline in the fuel tank 451.

The two-way valve 12 of the present invention can automatically adjust the position of the first or second valve plates 213, 231 according to the pressure change from the first valve piece 213 or the second valve piece 231, so as to automatically control the two-way valve 12 to be closed or turned on. effect.

When the two-way valve 12 of the present invention is mounted on the oil tank 451, the change in the internal pressure of the oil tank 451 can be utilized. When the pressure inside the oil tank 451 is negative, the suction force generated can displace the first valve piece 213, thereby making the outer portion of the socket 400 The air enters the balance pressure in the oil tank 451. When the inside of the oil tank 451 is positive pressure, the generated thrust can simultaneously push the first and second valve pieces 213, 231, so that the oil and gas inside the oil tank is dissipated to the outside of the socket 400, and when the oil tank 451 When the internal pressure is balanced with the outside, the first and second valve plates 213, 231 have a close function, so that the fuel in the oil tank 451 is not easily leaked when the vehicle is overturned.

The basic teachings of this creation have been described, and many extensions and variations will be apparent to those of ordinary skill in the art. For example, the capping device 10 of the present invention may not include the spacer 199. In the state lacking the spacer 199, the first valve piece 213 needs to have the ability to abut against the first step surface 435 without closing the slots. The second side 217 of the track 436, when a negative pressure is generated in the oil tank, the second side surface 217 of the first valve piece 213 can abut against the first step surface 435, and one end of the first spring 197 abuts against the second side On the side 217. Alternatively, the capping device 10 of the present invention may not include the spacer 251. When the second valve piece 231 is displaced to the second position in a state where the spacer 251 is absent, the first end surface 233 is abutted against the end of the lock cover 259. Face 276, and one end of second spring 255 abuts against first end face 233.

Furthermore, the two-way valve 12 of the present invention is not only used on the oil tank 451. The two-way valve 12 of the present invention is described in conjunction with the internal pressure change of the oil tank 451, but only one of the two-way valve 12 is used.

The present invention disclosed in the specification is to be considered as illustrative and not restrictive. The scope of the present invention is defined by the scope of the appended claims, and is not intended to be limited by the scope of the invention.

12‧‧‧Two-way valve

197‧‧‧First spring

199‧‧‧shims

211‧‧‧bond hole

212‧‧‧Circle wall

213‧‧‧First valve

215‧‧‧ first side

217‧‧‧ second side

219‧‧‧Bump

231‧‧‧Second valve

233‧‧‧ first end face

235‧‧‧second end face

237‧‧‧ binding column

239‧‧‧Perforation

251‧‧‧shims

253‧‧‧Combination hole

254‧‧‧ ring wall

255‧‧‧Second spring

257‧‧‧Seal ring

259‧‧‧Lock cover

260‧‧‧ outer ring wall

271‧‧‧ first end face

273‧‧‧second end face

275‧‧‧ ring wall

276‧‧‧End face

277‧‧ ‧ room

278‧‧‧vents

280‧‧‧ Groove

281‧‧‧ Extension tube

283‧‧‧Lock ear

400‧‧ ‧ socket

410‧‧‧ Ontology

411‧‧‧ first surface

412‧‧‧ second surface

413‧‧‧Connecting tube

414‧‧‧ channel

414A‧‧‧Constriction

415‧‧‧ installation space

417‧‧‧ first slot

419‧‧‧second trough

431‧‧‧ third slot

433‧‧‧fourth slot

434‧‧‧ bottom

435‧‧‧ first step

436‧‧‧ channel

437‧‧‧ second stage

439‧‧‧ lugs

455‧‧‧ screws

457‧‧‧ steel balls

459‧‧‧ 塞子

471‧‧‧through hole

Claims (9)

A two-way valve includes: a socket (400), the socket (400) includes a body (410), the body (410) includes a first surface (411) and a second surface (412), the socket (400) Further comprising a connecting tube (413) formed on the second surface (412), the socket (400) further comprising an installation space (415) formed on the first surface (411), the mounting space (415) comprising a first groove (417) extending from the surface (411) toward the second surface (412) but spaced apart from the second surface (412), extending from the bottom surface of the first groove (417) toward the second surface (412) but a second groove (419) spaced apart from the second surface (412), a third groove (431) formed on the bottom surface of the second groove (419), and a first groove formed on the bottom surface of the third groove (431) a four-slot (433), the fourth groove (433) has a bottom surface (434), and the installation space (415) further includes a first step surface formed at a boundary between the third groove (431) and the fourth groove (433) ( 435), and forming a second step (437) at a boundary between the second groove (419) and the third groove (431), the socket (400) further comprising an end face extending from the end of the connecting pipe (413) to the fourth a channel (414) of the slot (433); a first valve plate (213) movably mounted in the third slot (431) A valve plate (213) includes a first side surface (215) and a second side surface (217) facing the first step surface (435); a first spring (197) is mounted on the socket (400) Between the bottom surface (434) of the four slots (433) and the first valve plate (213), the first spring (197) is oppositely biased with the first valve plate (213); and a second valve plate (231) is movably Installed in the second slot (419), the second valve plate (231) includes a first end surface (233) and a second end surface (235) facing the first step surface (435), and the second valve plate (231) Further included in a perforation (239), the second valve plate (231) is displaced between the first position and the second position along the second groove (419); a lock cover (259) is fixed to the socket ( 400), the lock cover (259) has a first end surface (271) and a second end surface (273), and the lock cover (259) further includes a passage extending from the first end surface (271) to the second end surface (273) Stomata (278); a sealing ring (257) sealingly coupled between the first groove (417) and the second end surface (273) of the lock cover (259); a second spring (255) coupled to the lock cover (259) and the first Between the first end faces (233) of the two valve plates (231), the second spring (255) biases the second valve plate (231) in the first position; when the first valve plate (213) is not subjected to the first spring ( When the external force other than 197) and the second valve piece (231) is not subjected to an external force other than the second spring (255), the first valve piece (213) is biased by the first spring (197) to make the first side (215) Tightly abutting against the second end surface (235) of the second valve piece (231), the perforation (239) is closed, and the second valve piece (231) is biased by the second spring (255) at the first Positioning, the second end surface (235) is closely abutted against the first step surface (435), and the third and fourth slots (431, 433) are closed, when the suction force applied to the first valve sheet (213) is greater than When the first spring (197) is elastic, the first valve piece (213) compresses the displacement of the first spring (197) to disengage the first side surface (215) from the second end surface (235) of the second valve piece (231) to open the perforation. (239), when the pressure applied to the second valve piece (231) is greater than the elastic force of the second spring (255), the second valve piece (231) is compressed A spring (255) from the first position to a second bit position, the second end surface (235) from a first-order surface (435). The two-way valve of claim 1, wherein the lock cover (259) further comprises an extension tube (281) protruding from the first end surface (271), and the vent hole (278) is an extension tube (281) The end surface extends to the second end surface (273), and the extension tube (281) of the lock cover (259) and the connecting tube (413) of the socket (400) are respectively sleeved in a gas line (a) of the oil tank (451) ( 453), and the connecting pipe (413) of the bearing seat (400) faces the oil tank (451); when the internal pressure of the oil tank (451) is balanced with the outside, the first valve piece (213) is biased by the first spring (197) Pressing, the first side surface (215) is closely abutted against the second end surface (235) of the second valve piece (231), and the perforation (239) is closed, and the second valve piece (231) is second. The spring (255) is biased in the first position such that the second end surface (235) abuts against the first step surface (435), and the third and fourth slots (431, 433) are closed to prevent the fuel tank (451). Oil or fuel leakage inside, When the suction force generated inside the oil tank (451) is greater than the elastic force of the first spring (197) supporting the first valve piece (213), the first valve piece (213) compresses the displacement of the first spring (197) to make the first side (215) Opening the perforation (239) away from the second end surface (235), the external air is vented (278), vented (278), perforated (239), third (431), and fourth (433) via the passage (414) Entering the fuel tank (451), when the pressure generated inside the oil tank (451) is greater than the second spring (255) supporting the elastic force of the second valve piece (231) in the first position, the second valve piece (231) compresses the second The spring (255) is displaced to the second position to disengage the second end surface (235) from the first step surface (435), and the pressure inside the oil tank (451) enters the third and fourth slots (431, 433) via the passage (414). Then, it is released to the outside through the vent hole (278) and the vent hole (278). The two-way valve according to claim 1, wherein the connecting pipe (413) of the bearing seat (400) is fixed on a fuel tank (451), thereby forming a passage (414) of the bearing seat (400) and a fuel tank (451). Connecting; when the internal pressure of the oil tank (451) is balanced with the outside, the first valve piece (213) is biased by the first spring (197), so that the first side surface (215) is closely abutted against the second valve piece a second end surface (235) of (231), and the perforation (239) is closed, and the second valve piece (231) is biased by the second spring (255) in the first position to make the second end surface (235) close. The ground is placed against the first step (435), and the third and fourth slots (431, 433) are closed to prevent oil and gas leakage in the fuel tank (451). When the suction inside the oil tank (451) is greater than the first When a spring (197) supports the elastic force of the first valve piece (213), the first valve piece (213) compresses the displacement of the first spring (197) to disengage the first side surface (215) from the second end surface (235). The external air is introduced into the fuel tank (451) through the passage (414) through the vent (278), the vent (278), the perforation (239), the third groove (431), and the fourth groove (433), when the fuel tank ( 451) The internally generated pressure is greater than the second spring (255) supporting the second valve plate (231) When the spring force is in the first position, the second valve piece (231) compresses the second spring (255) to the second position, so that the second end surface (235) is disengaged from the first step surface (435), inside the fuel tank (451). Pressure enters the third and fourth slots via channel (414) (43 1, 433), and then released to the outside through the vent (278) and the vent (278). The two-way valve of claim 1, wherein the fourth groove (433) comprises a first groove (433) formed on the inner ring wall and extending between the first step surface (435) and the bottom surface (434). The channel (436), the first valve piece (213) includes a protrusion (219) formed on the second side (217), further comprising: a spacer (199) coupled to the first valve piece (213) The gasket (199) has a coupling hole (211), and the protrusion (219) of the first valve piece (213) is engaged in the coupling hole (211) of the gasket (199), and the gasket (199) is Located in the third slot (431), and the spacer (199) is smaller than the third slot (431), one end of the first spring (197) abuts against the spacer (199); when applied to the first valve When the pressure or suction force of (213) is less than or equal to the pressure or suction applied to the second valve plate (231), the gasket (199) is spaced apart from the first step surface (435); when applied to the first valve plate ( When the suction force of 213) is greater than the elastic force of the first spring (197), the spacer (199) is displaced with the first valve piece (213), and the spacer (199) abuts against the first step surface (435), the bearing seat (400) The external air is passed through the vent (278) through the vent (278), the perforation (239), the third slot (431), and the channel (436) Fourth slot (433) and then through passage (414) into the tank (451) the equilibrium pressure. The two-way valve of claim 1, wherein the gasket (199) comprises a ring wall (212) formed on the outer periphery, and the outer diameter of the ring wall (212) is slightly smaller than the third groove (431). The inner diameter causes the gasket (199) to hold the first valve plate (213) on the centerline of the third groove (431). The two-way valve of claim 1, wherein the second valve piece (231) comprises a coupling post (237) formed on the first end surface (233), further comprising: a second valve The sheet (231) is combined with a gasket (251). The gasket (251) has a coupling hole (253), the coupling column (237) is engaged with the coupling hole (253), and one end of the second spring (255) is Pressing on the gasket (251); when the pressure or suction applied to the first valve plate (213) is less than or equal to the pressure or suction applied to the second valve plate (231), the gasket (251) is tied with the lock The end faces (276) of the cover (259) are separated, When the suction force applied to the first valve piece (213) is greater than the elastic force of the first spring (197), the spacer (251) abuts against the end face (276) of the lock cover (259). The two-way valve of claim 6, wherein the gasket (251) further comprises a ring wall (254) formed on the outer circumference, the outer diameter of the ring wall (254) being slightly smaller than the inside of the second groove (419) The diameter causes the gasket (251) to hold the second valve plate (231) on the centerline of the second groove (419). The two-way valve of claim 1, wherein the second end surface (273) of the lock cover (259) further extends a ring wall (275), and the ring wall (275) has a distal end surface (276). a recess (280) is formed on the end surface (276), and a space chamber (277) communicating with the groove (280) is partitioned from the inner side of the ring wall (275), and each groove (280) and the chamber (280) 277) communicating, the ring wall (275) of the lock cover (259) extends into the second slot (419), and the seal ring (257) is located outside the ring wall (275), and the second spring (255) is located in the chamber ( 277); when the second valve piece (231) is in the second position, the second valve piece (231) is positioned opposite to the end face (276) of the ring wall (275) of the lock cover (259), first The first side surface (215) of the valve piece (213) abuts against the second end surface (235) of the second valve piece (231), and closes the perforation (239) of the second valve piece (231) into the oil tank (451). The pressure is introduced into the chamber (277) through the recess (280) of the lock cover (259) and released to the outside through the vent (278) and the vent (278). The two-way valve of claim 1, wherein the passage (414) of the socket (400) further comprises a tapered section (414A) adjacent to the bottom surface (434), comprising: a steel ball (457) movable Installed in the passage (414) of the socket (400), a plug (459) is screwed into the passage (414) of the socket (400), and the plug (459) includes a one end surface extending to the other end surface. a through hole (471); when the steel ball (457) is away from the tapered portion (414A) of the passage (414), the steel ball (457) does not block the passage (414) when the steel ball (457) is located in the tapered portion of the passage (414) While inside (414A), the steel ball (457) blocks the passage (414) of the seat (400).