CN219413654U - Large-caliber gas shut-off valve with simple installation and convenient maintenance - Google Patents

Abstract

The utility model discloses a large-caliber gas shut-off valve which is simple to install and convenient to maintain, and is applied to the technical field of large-caliber gas shut-off valves, and the technical scheme is as follows: the valve body is internally and fixedly provided with an elastic sealing component and a pressure sensing component for pushing the elastic sealing component, the gas inlet and the gas outlet are fixedly provided with mounting flanges, the pressure sensing component comprises a pressure sensing sleeve and a pull rod, the pressure sensing sleeve is internally and slidably connected with a pressure sensing plate and is coaxially and rotationally connected with an adjusting block based on adjusting threads, a pressure sensing spring is arranged between the adjusting block and the pressure sensing plate, the pull rod is fixedly provided with a first quick connecting piece, the pressure sensing sleeve is fixedly connected with a sealing cover in a locking manner, and the outer cover surface of the sealing cover is fixedly provided with a second quick connecting piece; the method has the technical effects that: the device is convenient to install, convenient to maintain and reset, and convenient to adjust.

Description

Large-caliber gas shut-off valve with simple installation and convenient maintenance

Technical Field

The utility model relates to the technical field of large-caliber gas shut-off valves, in particular to a large-caliber gas shut-off valve which is simple to install and convenient to maintain.

Background

The gas shut-off valve is a novel safety matching device for gas pipeline engineering, and is mainly used for the following occasions: when the pressure in the pipeline is monitored to be higher than or lower than a preset monitoring pressure value, the fuel gas cut-off valve automatically cuts off the combustible gas in the pipeline, so that the gas pressure in the pipeline is prevented from continuously increasing or the gas in the pipeline is prevented from leaking accidentally and largely, and danger is prevented.

On the one hand, the installation of current heavy-calibre gas trip valve is inconvenient, and mounting means and technology performance are influenced by pipeline pressure variation greatly to current heavy-calibre gas trip valve structure is complicated, and especially when need reset the gas trip valve after cutting off the gas, only can reset the gas trip valve to the special instrument that resets that needs maintenance workman hand-carry, and the installation is difficult, and maintenance operation that resets is not convenient enough, on the other hand, the pressure that current gas trip valve set for is fixed usually, and it is inconvenient to adjust to need change other forced induction springs usually when adjusting the trip pressure of gas, has the space of improvement.

Disclosure of Invention

The utility model aims to provide a large-caliber gas shut-off valve which is simple to install and convenient to maintain, and has the advantages of convenience in installation, rapidness in maintenance and reset operation and convenience in adjustment.

The technical aim of the utility model is realized by the following technical scheme: the large-caliber gas shut-off valve with simple installation and convenient maintenance comprises a valve body, wherein a gas input port and a gas output port are respectively formed in the valve body, and a ventilation valve port is arranged between the gas input port and the gas output port; the valve body internal fixation is equipped with and is used for sealing when gas pressure is unusual the elastic closure subassembly of ventilation valve port and be used for promoting elastic closure subassembly's pressure sensing subassembly, gas input port and gas output port department all fixedly is equipped with the mounting flange, pressure sensing subassembly including fixed mounting in pressure sensing sleeve on the valve body and with the pull rod that pressure sensing sleeve coaxial setting, the inside sliding connection of pressure sensing sleeve has the pressure sensing board and is connected with the regulating block based on adjusting screw coaxial rotation, the regulating block with be equipped with the pressure sensing spring between the pressure sensing board, the pull rod keep away from elastic closure subassembly's one end is fixed and is equipped with first quick connector, the pressure sensing sleeve is close to first quick connector's one end locking fixedly connected with sealed lid, thereby sealed lid outer cover face fixedly be equipped with the second quick connector of first quick connector cooperation realization locking.

The utility model is further provided with: the sealing cover comprises a threaded connection part which is locked and connected to the pressure sensing sleeve based on a threaded coaxial center, and a sealing cover which is fixedly connected to the threaded connection part and is used for abutting against the end part of the pressure sensing sleeve, and the second quick connecting piece is fixedly arranged at one end of the sealing cover, which is far away from the threaded connection part.

The utility model is further provided with: the first quick connector and the second quick connector are in locking connection based on threads, and the distance between the second quick connector protruding out of the outer end face of the sealing cover is greater than the distance between the upper end face of the first quick connector and the installation end face of the pressure sensing sleeve in a gas cutting-off state.

The utility model is further provided with: the pressure sensing sleeve with form the pressure sensing chamber between the valve body, pressure sensing intracavity is fixed to be equipped with the trip valve involucra, pressure sensing hole has been seted up to pressure sensing chamber bottom, is located pressure sensing intracavity fixedly be equipped with on the pull rod be used for the joint subassembly of pull rod, the joint subassembly with the axle center fixed set up in on the trip valve involucra, the pull rod keep away from pressure sensing telescopic one end is fixed to be equipped with and is used for the butt elasticity seal assembly's butt piece, the joint subassembly with be equipped with the cutting spring between the butt piece.

The utility model is further provided with: the clamping assembly comprises a clamping block which is coaxially and fixedly arranged in the valve body with the pull rod, a clamping sleeve which is used for being abutted against the lower end face of the diaphragm of the cut-off valve is sleeved on the clamping block, the clamping sleeve is coaxially and fixedly connected with the upper end face of the diaphragm of the cut-off valve in a locking manner and is used for being abutted against the upper end face of the diaphragm of the cut-off valve, a plurality of clamping balls are movably arranged on the clamping sleeve at intervals along the circumferential direction, a containing groove is formed in the clamping block, and a clamping groove is formed in the pull rod.

The utility model is further provided with: the elastic sealing assembly comprises a sealing assembly for sealing the ventilation valve port and a locking assembly for locking the sealing assembly, and a reset rod for driving the sealing assembly to reset is arranged on the valve body.

The utility model is further provided with: the sealing assembly comprises a rotary rod with one end rotatably connected to the valve body, a sealing plate for sealing the ventilation valve port is fixedly arranged on the rotary rod, a sealing torsion spring is arranged at the rotary end of the rotary rod, and the reset rod is fixedly connected to the rotary rod.

The utility model is further provided with: the locking assembly comprises a locking seat fixedly arranged in the valve body, a locking rod used for locking one end of the rotary rod is rotationally connected to the locking seat, a pressing rod used for pressing the locking rod is slidably connected to the locking seat in the axial direction of the pull rod, the pressing rod is located at one end of the rotary shaft and far away from the clamping position, a pressing ball used for being abutted to the locking rod is located at the other end of the rotary shaft and close to the clamping position is slidably connected to the locking seat, and a second return spring used for driving the pressing ball to reset is arranged on the locking seat.

The utility model is further provided with: the valve body is fixedly provided with a pressure balance valve, and two ends of the pressure balance valve are respectively and fixedly arranged on the valve body at two ends of the ventilation valve port.

In summary, the utility model has the following beneficial effects:

1. the gas shut-off valve is characterized in that a first quick connecting piece is fixedly arranged at one end of the pull rod, a second quick connecting piece is fixedly arranged on the sealing cover, the first quick connecting piece and the second quick connecting piece are locked and connected based on threads, when the gas shut-off valve is shut off and needs to be reset, the second quick connecting piece can be locked on the first quick connecting piece in a rotating mode only by unscrewing the sealing cover and reversing the sealing cover, the pull rod can be reset only by pulling the sealing cover, a worker does not need to carry a special tool, maintenance and reset operation is simple and convenient, after the reset operation is completed, the sealing cover is continuously locked and connected to the pressure sensing sleeve, and meanwhile, the mounting flange is arranged at the gas input port and the gas output port, so that the gas shut-off valve can be mounted through flange connection, and the gas shut-off valve is more convenient to mount;

2. the pressure sensing plate is arranged in the mounting sleeve and the adjusting block is arranged based on the adjusting screw threads, the pressure sensing spring is arranged between the adjusting block and the pressure sensing plate, and when the pressure set by the fuel gas cut-off valve needs to be adjusted, the adjusting block only needs to be rotated to adjust the position of the rotating block, so that the adjustment is convenient, and the pressure sensing spring does not need to be replaced.

Drawings

Fig. 1 is a schematic overall structure of the present embodiment;

fig. 2 is a structural cross-sectional view of the whole of the present embodiment;

FIG. 3 is an enlarged schematic view of portion A of FIG. 2;

FIG. 4 is an enlarged schematic view of portion B of FIG. 2;

fig. 5 is an enlarged schematic view of portion C of fig. 2.

Reference numerals: 1. a valve body; 11. a gas input port; 12. a gas outlet; 13. a vent valve port; 14. a mounting flange; 2. an elastic closure assembly; 21. a closure assembly; 211. a rotating rod; 212. a closing plate; 213. closing the torsion spring; 22. a locking assembly; 221. a locking seat; 222. locking a connecting rod; 223. a compression bar; 225. pressing and connecting the ball; 226. a second return spring; 23. a reset lever; 3. a pressure sensing assembly; 31. a pressure-sensitive sleeve; 32. a pull rod; 33. a pressure sensing plate; 34. an adjusting block; 35. a pressure-sensitive spring; 36. adjusting the screw thread; 37. a first quick connector; 38. sealing cover; 381. a threaded connection; 382. a cover; 383. a second quick connector; 39. an abutment block; 310. cutting off the spring; 4. a pressure sensing cavity; 41. a pressure sensing hole; 42. cutting off the valve membrane; 43. a clamping assembly; 431. a clamping block; 432. a clamping sleeve; 433. a top connection block; 434. a clamping ball; 435. a receiving groove; 436. a clamping groove; 5. a pressure balancing valve.

Detailed Description

The present utility model will be described in further detail with reference to the accompanying drawings.

Examples:

referring to fig. 1 and 2, a large-caliber gas shut-off valve with simple installation and convenient maintenance comprises a valve body 1, a gas input port 11 and a gas output port 12 are respectively arranged on the valve body 1, a ventilation valve port 13 is arranged between the gas input port 11 and the gas output port 12, the gas input port 11 is input from the gas output port 12 through the ventilation valve port 13, an elastic sealing component 2 for sealing the ventilation valve port 13 when the gas pressure is abnormal and a pressure sensing component 3 for pushing the elastic sealing component 2 are fixedly arranged in the valve body 1, mounting flanges 14 are fixedly arranged at the positions of the gas input port 11 and the gas output port 12, so that the gas shut-off valve is convenient to install on a gas pipeline based on the mounting flanges 14, the pressure sensing component 3 comprises a pressure sensing sleeve 31 fixedly arranged on the valve body 1 and a pull rod 32 coaxially arranged with the pressure sensing sleeve 31, the pressure sensing sleeve 31 is internally and slidably connected with the pressure sensing plate 33 and is rotatably connected with the regulating block 34 based on the coaxial center of the regulating screw thread 36, the pressure sensing spring 35 is arranged between the regulating block 34 and the pressure sensing plate 33, when the pressure set by the gas shut-off valve needs to be regulated, the distance between the regulating block 34 and the pressure sensing plate can be regulated by only rotating the regulating block 34 to realize the regulation of the position of the rotating block, thereby regulating the preset elastic force of the pressure sensing spring 35, the effect of regulating the pressure set by the gas shut-off valve is realized, the first quick connecting piece 37 is fixedly arranged at one end of the pull rod 32 far away from the elastic sealing assembly 2, the sealing cover 38 is fixedly connected with one end of the pressure sensing sleeve 31 close to the first quick connecting piece 37 in a locking manner, the second quick connecting piece 383 matched with the first quick connecting piece 37 to realize locking is fixedly arranged on the outer cover surface of the sealing cover 38, when maintenance and reset are needed after the gas shut-off valve is cut off, the workman only need lift off sealed lid 38 from pressure sensing sleeve 31 from top to bottom and with first quick connector 37 with second quick connector 383 butt joint back draw pull sealed lid 38 can realize driving pull rod 32 upward movement and can realize resetting, simultaneously fixed being equipped with pressure balance valve 5 on valve body 1, pressure balance valve 5 both ends are fixed respectively and are set up on valve body 1 at ventilation valve port 13 both ends, when resetting, the gas pressure at valve body 1 both ends is unequal, the easy pipeline that damages that resets, thereby control pressure balance valve 5 thereby makes the atmospheric pressure at valve body 1 both ends equal before resetting, later pulling pull rod 32 resets.

Referring to fig. 2 and 3, specifically, the sealing cap 38 includes a threaded connection portion 381 which is locked and connected to the pressure sensing sleeve 31 based on a threaded center, and a sealing cap 382 which is fixedly connected to the threaded connection portion 381 based on a coaxial center and is used for abutting against an end portion of the pressure sensing sleeve 31, the second quick connector 383 is fixedly disposed at an end of the sealing cap 382 away from the threaded connection portion 381, and for facilitating connection, the first quick connector 37 and the second quick connector 383 are locked and connected based on threads, and a distance of the second quick connector 383 protruding out of an outer end face of the sealing cap 382 is greater than a distance of an upper end face of the first quick connector 37 from an installation end face of the pressure sensing sleeve 31 in a gas cut-off state, so that the first quick connector 37 cannot normally contact the second quick connector 383.

Referring to fig. 2 and fig. 4, specifically, a pressure sensing cavity 4 is formed between the pressure sensing sleeve 31 and the valve body 1, a cut-off valve film 42 is fixed in the pressure sensing cavity 4, a pressure sensing hole 41 externally connected with a gas pipeline is formed in the bottom of the pressure sensing cavity 4, a clamping component 43 for clamping the pull rod 32 is fixed on the pull rod 32 in the pressure sensing cavity 4, the clamping component 43 is coaxially fixed on the cut-off valve film 42, an abutting block 39 for abutting against the elastic sealing component 2 is fixed at one end of the pull rod 32 far away from the pressure sensing sleeve 31, and a cut-off spring 310 is arranged between the clamping component 43 and the abutting block 39.

Referring to fig. 2 and 4, specifically, the clamping assembly 43 includes a clamping block 431 coaxially and fixedly disposed in the valve body 1 with the pull rod 32, a clamping sleeve 432 for abutting against the lower end face of the cut-off valve film 42 is sleeved on the clamping block 431, a cut is formed at the bottom of the clamping sleeve 432, an upper end face of the cut-off valve film 42 is coaxially and fixedly connected with the clamping sleeve 432, a plurality of clamping balls 434 are movably disposed on the clamping sleeve 432 at intervals along the circumferential direction uniformly, a containing groove 435 is formed on the clamping block 431, a clamping groove 436 is formed on the pull rod 32, and in an initial state, the clamping balls 434 are clamped in the clamping groove 436 to realize clamping of the pull rod 32 so that the pull rod 32 cannot move downwards, when the gas is introduced into the pressure sensing cavity 4, the jacking cut-off valve film 42 is upwards, the clamping sleeve 432 and the jacking block 433 are synchronously driven to upwards move to jack the pressure sensing block, the jacking block 433 can continue to upwards move only when the acting force of the gas on the cut-off valve film 42 is larger than the preset elastic force of the pressure sensing spring 35, when the clamping sleeve 432 moves upwards for a certain distance, the clamping ball 434 moves outwards from the accommodating groove 435 to enter a cut-open formed in the bottom of the clamping sleeve 432, the clamping ball 434 is not clamped in the clamping groove 436, the pull rod 32 is not clamped, and the cutting spring 310 drives the pull rod 32 to downwards move, so that the jacking block 39 at the bottom of the pull rod 32 abuts against the elastic sealing assembly 2, and the ventilation valve port 13 is sealed, so that the gas is cut off.

Referring to fig. 2 and 5, specifically, the elastic closing assembly 2 includes a closing assembly 21 for closing the ventilation valve port 13 and a locking assembly 22 for locking the closing assembly 21, and a reset lever 23 for driving the closing assembly 21 to reset is provided on the valve body 1. The closing component 21 comprises a rotary rod 211 with one end rotatably connected in the valve body 1, a closing plate 212 for closing the ventilation valve port 13 is fixedly arranged on the rotary rod 211, a closing torsion spring 213 is arranged at the rotary end of the rotary rod 211, a reset rod 23 is fixedly connected on the rotary rod 211, the locking component 22 comprises a locking seat 221 fixedly arranged in the valve body 1, a locking rod 222 for locking one end of the rotary rod 211 is rotatably connected on the locking seat 221, a pressing rod 223 for pressing the locking rod 222 to be positioned at one end of the rotary shaft and far away from the clamping position is slidably connected on the locking seat 221 along the axial direction of the pull rod 32, a pressing ball 225 for abutting the locking rod 222 to be positioned at the other end of the rotary shaft and close to the clamping position is slidably connected on the locking seat 221, the second return spring 226 for driving the press-connection ball 225 to reset is arranged on the locking seat 221, when the gas is in a conducting state, one end of the locking connection rod 222 is locked with one end of the rotary rod 211, the closed torsion spring 213 is compressed, when the pull rod 32 drives the abutting block 39 to abut the press rod 223 to downwards press one end of the locking connection rod 222, which is positioned at the press rod 223, descends, then one end of the pressing connection ball 225 is tilted, the locking connection rod 222 is separated from the locking connection rod 211, the closed torsion spring 213 returns to drive the closing plate 212 to close the ventilation valve port 13, so that the gas is cut off, when the gas is reset, the pull rod 32 is reset firstly, the air pressure is balanced, and then the rotary rod 23 is rotated to drive the rotary rod 211 to rotate, so that the locking connection rod 222 can continuously lock one end of the rotary rod 211, and the reset can be realized.

The use process is briefly described: when the gas pressure sensing cavity 4 is filled with gas, the clamping ball 434 is clamped in the clamping groove 436 to realize the clamping of the pull rod 32, so that the pull rod 32 cannot move downwards, the clamping sleeve 432 and the clamping block 433 are simultaneously driven to move upwards by the clamping valve film 42 and synchronously move upwards to clamp the pressure sensing block, only when the acting force of the gas on the cutting valve film 42 is larger than the preset elastic force of the pressure sensing spring 35, the clamping block 433 can continue to clamp the pressure sensing block to move upwards, when the clamping sleeve 432 moves upwards by a certain distance, the clamping ball 434 moves outwards from the containing groove 435 to enter a split opening formed in the bottom of the clamping sleeve 432, the clamping ball 434 is not clamped in the clamping groove 436 any more, the pull rod 32 loses clamping, the cutting spring 310 drives the pull rod 32 to move downwards, the abutting block 39 at the bottom of the pull rod 32 is abutted against the lock rod 223 to press one end 222 downwards, the end of the lock rod 222 is lifted up by one end of the pressure ball 225 when the gas acts on the cut-off film 42, the lock rod 222 is separated from the lock rod 222 to release from the cut-off spring 211, and the gas torsion spring 212 is driven to restore the seal plate 212 to realize the sealing of the gas pressure spring 212. When maintenance and restoration are needed, the pressure balance valve 5 is controlled first so that the air pressures at the two ends of the valve body 1 are equal, the sealing cover 38 is detached from the pressure sensing sleeve 31 up and down, the first quick connector 37 is in butt joint with the second quick connector 383, then the sealing cover 38 is pulled and pulled, the pull rod 32 is driven to move upwards, and finally the reset rod 23 is rotated to drive the rotary rod 211 to rotate, so that the locking connection rod 222 is continuously locked at one end of the rotary rod 211, and restoration can be realized.

The present embodiment is only for explanation of the present utility model and is not to be construed as limiting the present utility model, and modifications to the present embodiment which may creatively contribute to the present utility model as required may be made by those skilled in the art after reading the present specification, but are protected by patent laws within the scope of claims of the present utility model.

Claims (9)

1. The large-caliber gas shut-off valve with simple installation and convenient maintenance comprises a valve body (1), wherein a gas input port (11) and a gas output port (12) are respectively formed in the valve body (1), and a ventilation valve port (13) is arranged between the gas input port (11) and the gas output port (12); the quick-acting type gas valve is characterized in that an elastic sealing component (2) used for sealing a ventilation valve port (13) when gas pressure is abnormal and a pressure sensing component (3) used for pushing the elastic sealing component (2) are fixedly arranged in the valve body (1), a mounting flange (14) is fixedly arranged at the gas inlet (11) and the gas outlet (12), the pressure sensing component (3) comprises a pressure sensing sleeve (31) fixedly arranged on the valve body (1) and a pull rod (32) coaxially arranged with the pressure sensing sleeve (31), a pressure sensing plate (33) is connected in the pressure sensing sleeve (31) in a sliding mode and is connected with an adjusting block (34) based on coaxial rotation of an adjusting screw thread (36), a pressure sensing spring (35) is arranged between the adjusting block (34) and the pressure sensing plate (33), one end of the pull rod (32) far away from the elastic sealing component (2) is fixedly provided with a first quick connecting piece (37), the pressure sensing sleeve (31) is close to one end of the first quick connecting piece (37) and is fixedly connected with a first locking piece (383) in a locking mode, and the first locking piece (383) is fixedly connected with a second locking piece (383).

2. The large-caliber gas shut-off valve with simple installation and convenient maintenance according to claim 1, wherein the sealing cover (38) comprises a threaded connection part (381) which is connected to the pressure sensing sleeve (31) in a locking manner based on the thread coaxial center and a sealing cover (382) which is fixedly connected to the threaded connection part (381) and is used for abutting against the end part of the pressure sensing sleeve (31), and the second quick connection part (383) is fixedly arranged at one end of the sealing cover (382) which is far away from the threaded connection part (381).

3. The large-caliber gas shut-off valve with simple installation and convenient maintenance according to claim 2, wherein the first quick connector (37) and the second quick connector (383) are in locking connection based on threads, and the distance of the second quick connector (383) protruding out of the outer end face of the sealing cover (382) is larger than the distance of the upper end face of the first quick connector (37) from the installation end face of the pressure sensing sleeve (31) in a gas shut-off state.

4. The large-caliber gas shut-off valve with simple installation and convenient maintenance according to claim 1, wherein a pressure sensing cavity (4) is formed between the pressure sensing sleeve (31) and the valve body (1), a shut-off valve film (42) is fixedly arranged in the pressure sensing cavity (4), a pressure sensing hole (41) is formed in the bottom of the pressure sensing cavity (4), a clamping assembly (43) for clamping the pull rod (32) is fixedly arranged on the pull rod (32) in the pressure sensing cavity (4), the clamping assembly (43) is fixedly arranged on the shut-off valve film (42) in a coaxial manner, an abutting block (39) for abutting against the elastic sealing assembly (2) is fixedly arranged at one end, far away from the pressure sensing sleeve (31), of the pull rod (32), and a shut-off spring (310) is arranged between the clamping assembly (43) and the abutting block (39).

5. The large-caliber gas shut-off valve with simple installation and convenient maintenance according to claim 4, wherein the clamping assembly (43) comprises clamping blocks (431) which are fixedly arranged in the valve body (1) along the same axis as the pull rod (32), the clamping blocks (431) are connected with clamping sleeves (432) which are used for being abutted against the lower end surface of the shut-off valve film (42) on the basis of sleeving, the clamping sleeves (432) are fixedly connected with the upper end surface of the shut-off valve film (42) along the same axis, the clamping blocks (433) are used for being abutted against the pressure sensing plate (33), a plurality of clamping balls (434) are movably arranged on the clamping sleeves (432) at intervals along the circumferential direction, the accommodating grooves (435) are formed in the clamping blocks (431), and the clamping grooves (436) are formed in the pull rod (32).

6. The large-caliber gas shut-off valve with simple installation and convenient maintenance according to claim 1, wherein the elastic sealing assembly (2) comprises a sealing assembly (21) for sealing the ventilation valve port (13) and a locking assembly (22) for locking the sealing assembly (21), and a reset rod (23) for driving the sealing assembly (21) to reset is arranged on the valve body (1).

7. The large-caliber gas shut-off valve with simple installation and convenient maintenance according to claim 6, wherein the sealing assembly (21) comprises a rotary rod (211) with one end rotatably connected in the valve body (1), a sealing plate (212) for sealing the ventilation valve port (13) is fixedly arranged on the rotary rod (211), a sealing torsion spring (213) is arranged at the rotary end of the rotary rod (211), and the reset rod (23) is fixedly connected to the rotary rod (211).

8. The large-caliber gas shut-off valve with simple installation and convenient maintenance according to claim 7, wherein the locking assembly (22) comprises a locking seat (221) fixedly arranged in the valve body (1), a locking rod (222) used for locking one end of the rotating rod (211) is rotatably connected to the locking seat (221), a pressing rod (223) used for pressing the locking rod (222) to be located at one end of the rotating shaft and far away from a clamping position is slidably connected to the locking seat (221), a pressing ball (225) used for abutting the locking rod (222) to be located at the other end of the rotating shaft and close to the clamping position is slidably connected to the locking seat (221), and a second return spring (226) used for driving the pressing ball (225) to reset is arranged on the locking seat (221).

9. The large-caliber gas shut-off valve with simple installation and convenient maintenance according to claim 1 is characterized in that a pressure balance valve (5) is fixedly arranged on the valve body (1), and two ends of the pressure balance valve (5) are fixedly arranged on the valve body (1) at two ends of the ventilation valve port (13) respectively.