CN211039697U - Pneumatic angle seat valve - Google Patents

Abstract

The utility model provides a pneumatic angle seat valve belongs to valve technical field. The pneumatic angle seat valve solves the problems that an existing common pneumatic angle seat valve is poor in sealing performance and troublesome in assembly. This product includes that the side direction is equipped with the valve body of installation end, the installation end is fixed with lower disk seat, the last disk seat that has the inner chamber has been linked firmly to the disk seat upper end down, the gliding piston of inner chamber relative inner chamber that is equipped with, the mounting groove has been seted up on the piston outer peripheral face, be equipped with sealed the pad in the mounting groove, sealed outside edge is equipped with the flange, the flange supports with the cell wall formation of mounting groove and leans on, be equipped with annular convex part on the sealed medial surface, the upper and lower both ends of convex part support with mounting groove both sides cell wall respectively and just convex part medial surface and mounting groove tank bottom support and lean on, be equipped with the annular on the. This product has sealed effectual and installation advantage such as convenient.

Description

Pneumatic angle seat valve

Technical Field

The utility model belongs to the technical field of the valve, a angle seat valve is related to, especially, relate to a pneumatic angle seat valve.

Background

In the existing market, the application of pneumatic angle seat valve is comparatively extensive. The working principle of the pneumatic angle seat valve is simple, and the pneumatic angle seat valve generally comprises a stop valve and a pneumatic assembly capable of controlling the movement of a valve rod of the stop valve. The pneumatic assembly is generally comprised of a housing having a cylinder and a piston disposed within the cylinder. The valve rod is connected with the piston, and the valve rod is driven to move together through the motion energy of the piston. The piston moves through the air pressure difference in the cylinder, specifically, the peripheral surface of the piston and the inner side wall of the cylinder form circumferential sealing to divide the cylinder into an upper chamber and a lower chamber, the piston moves downwards to drive the valve rod to move downwards to enable the stop valve to be in a normally closed state by flushing high-pressure gas into the upper chamber, and then the lower chamber is inflated to enable the air pressure of the lower chamber to be greater than the air pressure of the upper chamber to open the stop valve. With the use we find that most pneumatic angle valve failures are caused by pneumatic component damage. The basic problem of damage of the pneumatic assembly is that the pneumatic assembly is arranged on a piston, and due to the fact that the pneumatic assembly is used too frequently or the service life is prolonged, the tightness between the piston and the side wall of a cylinder is poor, the upper chamber and the lower chamber cannot form air pressure difference, the effect is weak, side leakage exists and the like, and therefore the problem that the pneumatic assembly is required to be handled cannot be solved at present.

Disclosure of Invention

The utility model aims at the above-mentioned problem that prior art exists, provide a pneumatic angle seat valve. The pneumatic angle seat valve solves the technical problems of poor sealing performance and troublesome assembly of a common pneumatic angle seat valve.

The purpose of the utility model can be realized by the following technical proposal:

the utility model provides a pneumatic angle seat valve, is equipped with the valve body of installation end including the side direction, the installation end is fixed with down the disk seat, and lower disk seat upper end has linked firmly the last disk seat that has the inner chamber, the interior intracavity is equipped with the gliding piston of relative inner chamber of ability, the mounting groove has been seted up on the piston outer peripheral face, is equipped with sealed the pad in the mounting groove, its characterized in that, sealed outside edge of filling up is equipped with the flange, and the flange supports with the cell wall formation of mounting groove and leans on, is equipped with annular convex part on the sealed medial surface of filling up, and the upper and lower both ends of convex part support with mounting groove both sides cell wall respectively and just convex part medial surface and mounting groove tank bottom support and lean on, are equipped with.

The piston is arranged in the inner cavity and can slide up and down relative to the inner cavity, the piston and the side wall of the inner cavity form circumferential sealing, the inner cavity is divided into two air cavities by the piston, the piston can slide up and down relative to the inner cavity by changing the air pressure of one of the air cavities, generally speaking, the air cavity at the upper end of the piston is inflated to increase the pressure of the air cavity, and the piston moves downwards to drive the valve core to move downwards so that the angle seat valve is in a normally closed state. When the angle seat valve needs to be opened, the air cavity at the lower end of the piston is inflated to enable the air pressure of the air cavity to exceed the air cavity at the upper end of the piston, and the piston moves upwards to drive the valve body to be opened. Therefore, in the movement, the circumferential sealing performance between the piston and the side wall of the inner cavity is particularly important, and if the circumferential sealing performance is not good, the pressure difference cannot be formed in the two air cavities or the pressure difference gradually decreases along with the time, so that the opening and closing are failed. The outer peripheral surface of the piston is provided with an annular mounting groove, a sealing ring is arranged in the mounting groove, the outer side surface of the sealing ring and the side wall of the inner cavity abut against each other to form sealing, and the sealing performance is improved in such a mode. Because the piston need move its periphery all not direct with the contact of inner chamber lateral wall, for the convenience installation sealing washer, the mounting groove all need be bigger than the sealing washer size usually, like this along with the use causes the leakproofness variation reason often all be gas from the mounting groove notch of one side get into the mounting groove in, then get into the gas chamber of another side from the opposite side notch.

So this product is equipped with the flange through the sealing pad up end outside, and the flange supports with the one side notch formation of mounting groove and leans on, reinforcing leakproofness. The sealed inboard of filling up the upper end is equipped with annular convex part, is equipped with the annular on the convex part medial surface, and the convex part top supports with one side cell wall of mounting groove and leans on to form sealedly, further improves the leakproofness. The inboard tank bottom of protruding portion and mounting groove supports to lean on to form sealedly, because the existence of the annular protruding portion medial surface is sealed by original face and face single point contact and is become the two point contact of two notches of annular and mounting groove tank bottom contact, further promotes sealed effect. And the existence of annular makes sealed pad and mounting groove support to take place elastic deformation more easily when forming sealed for each position supports with each lateral wall of mounting groove and supports to increase sealed life who fills up softly more. Evenly distributed has a plurality of square lugs that are on the terminal surface of the sealing washer between convex part and the flange, the effect of lug lie in with the installation sealed fill in with the lateral wall of mounting groove support by to make the installation target in place more, because sealed fill can have itself to take place deformation installation to get up crooked and lead to the leakproofness to descend when the installation is difficult to avoid through all adopting the rubber material to make, the lug can support with the cell wall of mounting groove and prevent that flexible material from taking place to influence the leakproofness when the installation is waiting the condition such as position not just. Still seted up flutedly between lug and the convex part, the both sides of recess are lug and convex part respectively, lug and convex part all lean on with the mounting groove lateral wall to form sealedly, and elastic deformation can all take place in these two positions, and the setting up of recess can make deformation obtain the buffering for lug and convex part and mounting groove lateral wall support more abundant that leans on, make sealed life who fills up also obtain promoting when the leakproofness obtains further strengthening.

In the pneumatic angle seat valve, a guide bevel opening is further formed at the upper end opening of the convex part.

The bevel connection of direction can fix a position into the mounting groove more easily in the sealed pad of installation in, the setting of bevel connection also can play certain cushioning effect moreover for the convex part takes place the shape change and adds fully and the mounting groove cooperation is compacter, and the leakproofness further obtains promoting.

In foretell pneumatic angle seat valve, go up the valve casing including being the sealed cylindric valve casing of lower extreme opening in upper end and with the valve gap that lower disk seat threaded connection is fixed, the valve gap is located the valve casing lower extreme inboard and both form circumference sealedly, valve casing lower extreme mouth department has the portion of blocking along its radial arch, the card is equipped with the jump ring in the portion of blocking upper end, and terminal surface and the portion of blocking up end support are leaned on under the jump ring, and the jump ring up end supports with the valve gap down the terminal surface and leans on.

The lower port of the valve shell is provided with a resisting part along the radial bulge of the valve shell, the upper end of the resisting part is clamped with a clamp spring, the lower end face of the clamp spring is abutted against the upper end face of the resisting part, and the upper end face of the clamp spring is abutted against the lower end face of the valve cover. The valve gap is realized through the jump ring and is fixed with the valve casing, and the product on the comparatively market of cooperation mode is more convenient, has promoted the assembly convenience.

In the pneumatic angle seat valve, the valve casing inner side wall at the upper end of the resisting part is further provided with a positioning groove, and the outer peripheral surface of the valve cover is provided with a blocking edge which is abutted against the groove wall at the upper side of the positioning groove.

The up end of keeping off the edge supports with the upside cell wall of constant head tank and leans on, and the lower terminal surface of valve gap forms again with the up end of jump ring and supports and lean on, sets up like this and makes the valve gap obtain spacing and valve casing even-in-one, has also further made things convenient for the assembly of valve casing.

In the pneumatic angle seat valve, a valve rod penetrates through the lower valve seat, the upper end of the valve rod penetrates through the valve cover to be fixedly connected with the lower end of the piston, and the lower end of the valve rod is further connected with a valve core for controlling the valve body to open and close.

In the pneumatic angle seat valve, the upper end of the valve core is provided with a mounting hole, the lower end of the valve rod is positioned in the mounting hole, the outer peripheral surface of the valve core is further provided with a pin hole which laterally penetrates through the valve core and the valve rod, and a cylindrical pin is arranged in the pin hole.

The lower extreme at the valve rod is fixed through the cylindric lock to the case, and convenient assembling and structural strength are high.

In one of the pneumatic angle seat valves, the inner diameter of the pin hole is larger than the diameter of the cylindrical pin.

Because the pneumatic valve open and shut dynamics in the twinkling of an eye is great, so often great to the damage of case, the internal diameter of pinhole is greater than the cylindric lock and makes certain clearance between cylindric lock and the pinhole for valve rod downstream drives the case and can obtain certain buffering together downstream when aerifing in the twinkling of an eye, has slowed down the impact dynamics in the twinkling of an eye of valve rod greatly, makes the life of case obtain promoting.

In the pneumatic angle seat valve, the lower end of the valve core is fixedly provided with an annular sealing element, the outer side of the lower end of the sealing element is provided with a matching part which is obliquely arranged, a water passing hole which is communicated with the water inlet end and the water outlet end is formed in the valve body, and the outer side surface of the matching part is abutted against the orifice of the water passing hole to form sealing.

The sealing member lower extreme outside is equipped with the cooperation portion that the slope set up, the sealed effect of the fitting surface that the slope set up is better outstanding, specifically in the use because the dynamics that pneumatic reason case assaulted water hole drill way in the twinkling of an eye is also very big, in-process of long-term use, the sealing member is easy to be out of shape under the effect of big impact, but this product is owing to be inclined plane and the cooperation of crossing water hole drill way, the lower extreme of cooperation portion stretches into in the water hole, even the cooperation portion takes place to deform under the effect of impact like this, also be by crossing water hole drill way and surely go out a breach, the side of breach and the water hole upper end mouth support and lean on, the another side of breach supports with the inside wall in water hole and supports, can say that the sealed effect between case and the water.

In the pneumatic angle seat valve, the valve casing is further provided with a first air inlet and a second air inlet, the first air inlet is located on the outer peripheral surface of the valve casing at the upper end of the piston, and the second air inlet is located on the outer peripheral surface of the valve casing at the lower end of the piston.

This product makes the valve body keep normally closed state through the inner chamber that the air inlet is first with gaseous rush into piston upper end, aerifys through the air inlet two pairs of inner chambers of piston lower extreme when needing to open this product and makes its atmospheric pressure be greater than the atmospheric pressure of the inner chamber of piston upper end and can accomplish and open.

Compared with the prior art, the product has the advantages that:

1. this product is equipped with the flange through the sealing pad up end outside, and the flange supports with one side notch of mounting groove formation and leans on, strengthens the leakproofness, and the convex part top is supported with one side cell wall of mounting groove and is supported and sealed, further improves the leakproofness, and the setting up of annular makes the convex part medial surface become the two point contact of two notches of annular and mounting groove tank bottom contact by original face and face single point contact seal, further promotes sealed effect.

2. The valve gap is fixed with the valve casing through the jump ring, and is easy to assemble and overhauld, and the convenience of installation has also further been improved to case and valve rod through the cylindric lock fixed.

Drawings

Fig. 1 is a half sectional view of the present invention;

FIG. 2 is a detail view of a gasket of the present invention;

fig. 3 is a cross-sectional view of the gasket of the present invention;

fig. 4 is an enlarged view of the present invention at a.

In the figure, 1, a valve body; 11. an installation end; 12. water passing holes; 2. a lower valve seat; 3. an upper valve seat; 31. a valve housing; 311. a resisting part; 312. positioning a groove; 32. a valve cover; 321. a flange; 33. an inner cavity; 34. a first air inlet; 35. a second air inlet; 4. a piston; 41. mounting grooves; 5. a gasket; 51. a flange; 52. a convex portion; 53. a ring groove; 54. a bump; 55. a groove; 56. a guide bevel opening; 6. a clamp spring; 7. a valve stem; 71. a pin hole; 8. a valve core; 81. mounting holes; 9. a cylindrical pin; 10. a seal member; 101. a mating portion.

Detailed Description

The following are specific embodiments of the present invention and the accompanying drawings are used to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

The pneumatic angle seat valve shown in fig. 1 comprises a valve body 1, wherein the left end of the valve body 1 is a water inlet end, the right end of the valve body is a water outlet end, and a water through hole 12 is formed between the water outlet end and the water inlet end. The valve body 1 is also provided with a mounting end 11 which is opposite to the water through hole 12 and is obliquely arranged, and the mounting end 11 is connected with the lower valve seat 2 through threads. Wear to be equipped with valve rod 7 in the lower valve seat 2, the valve rod 7 lower extreme is fixed with case 8, specifically is equipped with mounting hole 81 through case 8 upper end, and valve rod 7 lower extreme is located mounting hole 81, still is equipped with the pinhole 71 that the side direction runs through case 8 and valve rod 7 on the case 8 outer peripheral face, is equipped with cylindric lock 9 in the pinhole 71, and case 8 fixes the lower extreme at valve rod 7 through cylindric lock 9, and convenient assembling and structural strength are high. And the internal diameter of pinhole 71 is greater than the diameter of cylindric lock 9, because the dynamics of opening and shutting in the twinkling of an eye of pneumatic valve is great, so often great to the damage of case 8, the internal diameter of pinhole 71 is greater than cylindric lock 9 and makes to have certain clearance between cylindric lock 9 and the pinhole 71 for valve rod 7 downstream drives case 8 and can obtain certain buffering together downstream when aerifing in the twinkling of an eye, has slowed down the impact dynamics in the twinkling of an eye of valve rod 7 greatly, makes the life of case 8 obtain promoting. The lower end of the valve core 8 is also provided with an annular sealing element 10, the outer side of the lower end of the sealing element 10 is provided with a matching part 101 which is obliquely arranged, a water passing hole 12 which is communicated with a water inlet end and a water outlet end is arranged in the valve body 1, and the outer side surface of the matching part 101 is abutted against the hole opening of the water passing hole 12 to form sealing. The sealing member 10 lower extreme outside is equipped with the cooperation portion 101 that the slope set up, the sealed effect of the fitting surface that the slope set up is better outstanding, specifically in the use because pneumatic reason case 8 strikes the dynamics of crossing water hole 12 drill way in the twinkling of an eye also very big, in-process of long-term use, deformation takes place for sealing member 10 easily under the effect of big impact, but this product is owing to be inclined plane and the cooperation of crossing water hole 12 drill way, the lower extreme of cooperation portion 101 stretches into in crossing water hole 12, even the cooperation portion 101 takes place deformation and can produce a breach under the effect of impact like this, the last side and the water hole 12 upper end mouth of this breach support and lean on, the downside of breach supports with the inside wall that crosses water hole 12 and lean on, can say that the sealed effect between case 8 and the water hole 12 further obtains promoting after taking place deformation.

The 7 upper ends of valve rod of this product expose outside disk seat 2 down, disk seat 3 is gone back threaded connection in the 2 upper ends of disk seat down, go up disk seat 3 including be the sealed cylindric valve casing 31 of lower extreme opening in upper end and with the fixed valve gap 32 of the 2 threaded connection of disk seat down, valve gap 32 is located the inboard and both formation circumference of valve casing 31 lower extreme and is sealed, port department has retaining part 311 along its radial bulge under the valve casing 31, constant head tank 312 has still been seted up on the valve casing 31 inside wall of retaining part 311 upper end, be equipped with on the valve gap 32 outer peripheral face and lean on the flange 321 with constant head tank 312 upside cell wall, retaining part 311 upper end card is equipped with jump ring 6, terminal surface and retaining part 311 up end support under the jump ring 6 lean on, 6 up end and 32. Valve gap 32 realizes through jump ring 6 that it is fixed with valve casing 31, and the product on the comparatively market of cooperation mode is more convenient, has promoted the assembly convenience. The upper end face of the blocking edge 321 abuts against the upper side groove wall of the positioning groove 312, the lower end face of the valve cover 32 abuts against the upper end face of the clamp spring 6, and the valve cover 32 is limited and connected with the valve casing 31 into a whole by the aid of the arrangement, so that the valve casing 31 is further convenient to assemble.

The valve shell 31 and the valve cover 32 surround to form an inner cavity 33, a piston 4 is arranged in the inner cavity 33, the inner cavity 33 is divided into an upper cavity and a lower cavity by the piston 4, the upper end of the valve rod 7 penetrates through the valve cover 32 to be fixedly connected with the lower end of the piston 4, a first air inlet 34 and a second air inlet 35 are further arranged on the valve shell 31, the first air inlet 34 is located on the outer peripheral surface of the valve shell 31 corresponding to the upper cavity, and the second air inlet 35 is located on the outer peripheral surface of the valve. This product makes valve body 1 keep normally closed state through air inlet one 34 with gaseous rush into the upper chamber, aerifys through air inlet two 35 when needing to open this product and makes its atmospheric pressure be greater than the atmospheric pressure of upper chamber and can accomplish and open. The valve rod 7 between the junction of valve gap 32 and valve rod 7 still overlaps outward to be equipped with and is used for strengthening the connection sheath of leakproofness between valve gap 32 and the valve rod 7, and the valve rod 7 of valve rod 7 and lower disk seat 2 junction also overlaps outward to be equipped with and is connected the sheath, sets up like this and can strengthen the leakproofness between valve rod 7 and lower disk seat 2 and the valve gap 32, can make the valve rod 7 more smooth and have the advantages of reducing friction, increase of service life etc. at the in-process of up-and-down motion again.

As shown in fig. 1-4, the piston 4 divides the inner cavity 33 into an upper chamber and a lower chamber, and the piston 4 slides up and down relative to the inner cavity 33 by changing the air pressure of one of the air chambers, generally speaking, the upper chamber is inflated to increase the pressure of the air chamber, so that the downward movement of the piston 4 drives the valve core 8 to move downward, and the angle seat valve is in a normally closed state. When the angle seat valve needs to be opened, the lower cavity is inflated to enable the air pressure of the lower cavity to exceed the air cavity at the upper end of the piston 4, and then the piston 4 moves upwards to drive the valve body 1 to be opened. Therefore, the circumferential sealing performance formed by the piston 4 and the side wall of the inner cavity 33 is particularly important in the movement, and if the circumferential sealing performance is not good, the pressure difference cannot be formed in the two air cavities or the pressure difference gradually decreases along with the time, so that the opening and closing are not realized. Usually, the outer circumferential surface of the piston 4 is provided with an annular mounting groove 41, a sealing ring is arranged in the mounting groove 41, and the outer side surface of the sealing ring is abutted against the side wall of the inner cavity 33 to form sealing, so that the sealing performance is improved. Because the piston 4 needs to move, the peripheral surface of the piston is not directly contacted with the side wall of the inner cavity 33, in order to install the sealing ring, the size of the installation groove 41 is usually larger than that of the sealing ring, so that the reason that the sealing performance is poor along with the use is that gas enters the installation groove 41 from the notch of the installation groove 41 on one side and then enters the air cavity on the other side from the notch on the other side, and the sealing effect is influenced. This product is through setting up flange 51 outside sealed 5 up end face, and sealed 5 upper end inboard is equipped with annular convex part 52, is equipped with annular 53 on the lateral surface of convex part 52, and evenly distributed has a plurality of square lugs 54 on the sealed 5 up end between convex part 52 and flange 51, has still seted up recess 55 between lug 54 and the convex part 52, and sealed 5 lower extreme face sets up with the up end symmetry. The outer side of the upper end face of the sealing gasket 5 is provided with a flange 51, and the flange 51 is abutted against the notch on one side of the mounting groove 41 to enhance the sealing property. The inner side of the upper end of the sealing gasket 5 is provided with an annular convex part 52, the inner side surface of the convex part 52 is provided with a ring groove 53, and the top end of the convex part 52 is abutted against the groove wall on one side of the mounting groove 41 to form sealing, so that the sealing performance is further improved. The inner side of the convex part 52 abuts against the groove bottom of the mounting groove 41 to form a seal, and due to the fact that the inner side face of the convex part 52 of the ring groove 53 is changed from original face-to-face single-point contact seal into two-point contact of two notches of the ring groove 53 and the groove bottom of the mounting groove 41, the sealing effect is further improved. And the existence of annular groove 53 makes the sealed 5 and the mounting groove 41 support to form elastic deformation more easily when sealed, makes each position and each lateral wall of mounting groove 41 support to support and increases the life of sealed 5 more softly. A plurality of square protruding blocks 54 are uniformly distributed on the upper end face of the sealing gasket 5 between the convex portion 52 and the flange 51, the protruding blocks 54 are used for abutting against the side wall of the mounting groove 41 when the sealing gasket 5 is mounted so as to enable the mounting to be more in place, the sealing gasket 5 is made of rubber materials, deformation and deflection can be generated when the sealing gasket 5 is mounted, the sealing performance is reduced, and the protruding blocks 54 can abut against the groove wall of the mounting groove 41 to prevent flexible materials from being affected when the mounting is not in right waiting position. Still seted up recess 55 between lug 54 and the convex part 52, the both sides of recess 55 are lug 54 and convex part 52 respectively, lug 54 and convex part 52 all lean on with mounting groove 41 lateral wall to form sealedly, elastic deformation can all take place at these two positions, the setting up of recess 55 can make deformation obtain the buffering, make lug 54 and convex part 52 lean on more abundant with mounting groove 41 lateral wall, make the life of sealed pad 5 also obtain promoting when the leakproofness obtains further strengthening. The upper end opening of the convex part 52 is also provided with a guide bevel opening 56. The bevel connection 56 that leads can fix a position into mounting groove 41 more easily in the time of the sealed pad 5 of installation, and the setting of bevel connection also can play certain cushioning effect moreover for convex part 52 takes place to deform more fully and mounting groove 41 cooperation is compacter, and the leakproofness further obtains promoting.

The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications, additions and substitutions for the specific embodiments described herein may be made by those skilled in the art without departing from the spirit of the invention or exceeding the scope of the invention as defined in the accompanying claims.

Claims (9)

1. The utility model provides a pneumatic angle seat valve, includes that the side direction is equipped with valve body (1) of installation end (11), installation end (11) are fixed with down disk seat (2), and disk seat (2) upper end has linked firmly last disk seat (3) that have inner chamber (33) down, be equipped with gliding piston (4) of inner chamber (33) relatively in inner chamber (33), mounting groove (41) have been seted up on piston (4) the outer peripheral face, be equipped with sealed the pad (5) in mounting groove (41), its characterized in that, sealed pad (5) outside edge is equipped with flange (51), and flange (51) and the cell wall of mounting groove (41) form to support and lean on, are equipped with annular convex part (52) on sealed pad (5) the inboard face, and the upper and lower both ends of convex part (52) support with mounting groove (41) both sides cell wall respectively and lean on convex part (52) medial surface and mounting groove (41) tank bottom support, a plurality of square convex blocks (54) are uniformly distributed on the sealing gasket (5) between the convex part (52) and the flange (51), and a groove (55) is formed between each convex block (54) and the corresponding convex part (52).

2. A pneumatic angle seat valve according to claim 1, characterized in that the upper port of the boss (52) is further provided with a guide bevel (56).

3. A pneumatic angle seat valve according to claim 1, characterized in that, the upper valve seat (3) comprises a valve casing (31) with an upper end sealing and a lower end opening and a valve cover (32) fixed with the lower valve seat (2) in a threaded connection manner, the valve cover (32) is positioned at the inner side of the lower end of the valve casing (31) and forms a circumferential sealing with the lower end of the valve casing (31), a resisting part (311) is protruded at the lower end opening of the valve casing (31) along the radial direction of the valve casing, a clamp spring (6) is clamped at the upper end of the resisting part (311), the lower end surface of the clamp spring (6) is abutted against the upper end surface of the resisting part (311), and the upper end surface of the clamp spring (6) is.

4. A pneumatic angle seat valve according to claim 3, characterized in that the valve housing (31) at the upper end of the resisting part (311) is further provided with a positioning groove (312) on the inner side wall, and the valve cover (32) is provided with a stopping edge (321) on the outer peripheral surface which is abutted with the upper side groove wall of the positioning groove (312).

5. A pneumatic angle seat valve according to claim 4, characterized in that, a valve rod (7) is arranged in the lower valve seat (2) in a penetrating way, the upper end of the valve rod (7) passes through the valve cover (32) and is fixedly connected with the lower end of the piston (4), and the lower end of the valve rod (7) is also connected with a valve core (8) for controlling the valve body (1) to open and close.

6. The pneumatic angle seat valve of claim 5, characterized in that, the upper end of the valve core (8) is provided with a mounting hole (81), the lower end of the valve rod (7) is positioned in the mounting hole (81), the outer peripheral surface of the valve core (8) is further provided with a pin hole (71) which laterally penetrates through the valve core (8) and the valve rod (7), and a cylindrical pin (9) is arranged in the pin hole (71).

7. A pneumatic angle seat valve according to claim 6, characterized in that the internal diameter of the pin hole (71) is greater than the diameter of the cylindrical pin (9).

8. A pneumatic angle seat valve according to claim 7, characterized in that the lower end of the valve core (8) is fixed with a ring-shaped sealing member (10), the outer side of the lower end of the sealing member (10) is provided with an inclined matching part (101), the valve body (1) is internally provided with a water through hole (12) which is communicated with the water outlet end and the water inlet end, and the outer side surface of the matching part (101) is abutted with the hole opening of the water through hole (12) to form a seal.

9. A pneumatic angle seat valve according to any one of claims 3 to 8, characterized in that the valve housing (31) is further provided with a first inlet port (34) and a second inlet port (35), the first inlet port (34) being located on the outer peripheral surface of the valve housing (31) at the upper end of the piston (4), and the second inlet port (35) being located on the outer peripheral surface of the valve housing (31) at the lower end of the piston (4).

Images