CN217401799U

CN217401799U - Differential pressure detection combined type isolating valve

Info

Publication number: CN217401799U
Application number: CN202221251666.0U
Authority: CN
Inventors: 杨文贵; 黎文彬; 刘生君
Original assignee: Jiaxing Da Ding Automation Technology Co ltd
Current assignee: Jiaxing Da Ding Automation Technology Co ltd
Priority date: 2022-05-19
Filing date: 2022-05-19
Publication date: 2022-09-09
Anticipated expiration: 2032-05-19

Abstract

The utility model discloses a pressure difference detection combined isolating valve, which comprises a base, a first valve seat, a first cylinder and a first piston; the lower end of the first valve seat is fixed on the base, a cavity is formed between the first valve seat and the base, the first cylinder is fixed at the upper end of the first valve seat, the first piston can vertically and slidably penetrate through the first valve seat, the upper end of the first piston is connected with the driving end of the first cylinder, an air inlet channel, a first air outlet channel and a second air outlet channel are arranged in the base, one end of the air inlet channel, one end of the first air outlet channel and one end of the second air outlet channel are all communicated with the cavity, a sealing gasket is embedded at the lower end of the first piston, a first vent hole and a second vent hole are further arranged on the base, and one end of the first vent hole and one end of the second vent hole are respectively communicated with the first air outlet channel and the second air outlet channel; the utility model discloses can simultaneous control to the aerifing and stopping to aerify of quilt survey pipe fitting and standard pipe fitting.

Description

Differential pressure detection combined type closing valve

Technical Field

The utility model relates to a closing valve technical field, concretely relates to pressure differential detection combination formula closing valve.

Background

After the production of the pipe fitting is finished, the air tightness of the pipe fitting needs to be detected, and the main purpose of the air tightness detection is to detect whether the pipe fitting leaks or not; the current method for detecting the air tightness of the pipe fitting is as follows: firstly, plugging one end of a pipe to be detected and one end of a standard pipe, then sealing one of the sealing joints with the other end of the pipe to be detected, sealing the other sealing joint with the other end of the standard pipe, then connecting one of the sealing joints with the air outlet end of one of the air valves through one of the connecting pipes, connecting the other sealing joint with the air outlet end of the other air valve through the other connecting pipe, then connecting the air inlet ends of the two air valves with the air inlet pipe, in addition, one of the air inlet ends of the air pressure difference detection sensor needs to be communicated with one of the connecting pipes, and the other air inlet end of the air pressure difference detection sensor is communicated with the other connecting pipe, in addition, the air pressure difference detection sensor is electrically connected with the controller, when the detection is started, opening the two air valves to enable the air inlet pipe to fill compressed air into the pipe to be detected and the standard pipe, after the inflation is finished, the two air valves are closed, then the air pressure difference detection sensor starts to detect the air pressure difference between one connecting pipe and the other connecting pipe, if the air pressure difference between one connecting pipe and the other connecting pipe is smaller than a preset value, the condition that the tested pipe does not leak is indicated, and if the air pressure difference between one connecting pipe and the other connecting pipe is larger than the preset value, the condition that the tested pipe leaks is indicated, so that the air tightness of the tested pipe can be detected; however, in the above detection process, whether the air inflation of the detected pipe fitting and the standard pipe fitting is carried out or not needs to be independently controlled through two air valves, so that the defects of complex control and complex structure exist.

SUMMERY OF THE UTILITY MODEL

The utility model provides a not enough to prior art, the utility model provides a pressure differential detection combination formula partition valve, it can simultaneous control to being aerifyd and stop aerifing of survey pipe fitting and standard pipe fitting to have the advantage that control is simple, and can simplify the structure of pipe fitting gas tightness check out test set.

The utility model discloses a pressure difference detection combined isolating valve, which comprises a base, a first valve seat, a first cylinder and a first piston; the lower end of the first valve seat is fixed on the base, a first sealing structure is arranged between the lower end of the first valve seat and the base, a cavity is formed between the first valve seat and the base, the first cylinder is fixed at the upper end of the first valve seat, the first piston is vertically and slidably arranged in the first valve seat in a penetrating manner, the lower end of the first piston extends into the cavity, a second sealing structure is arranged between the first piston and the first valve seat, the upper end of the first piston is connected with the driving end of the first cylinder, an air inlet channel, a first air outlet channel and a second air outlet channel are arranged in the base, one end of the air inlet channel, one end of the first air outlet channel and one end of the second air outlet channel are communicated with the cavity, the other end of the air inlet channel is used for being connected with an air inlet pipe, the other end of the first air outlet channel and the other end of the second air outlet channel are respectively used for being connected with one end of a pipe to be tested and one end of a standard pipe fitting, the lower end of the first piston is embedded with a sealing gasket, the first piston is driven by the first cylinder to move downwards, the sealing gasket is used for abutting against the upper end face of the base and sealing one end of the first air outlet channel and one end of the second air outlet channel, the base is further provided with a first air vent and a second air vent, one end of the first air vent and one end of the second air vent are respectively communicated with the first air outlet channel and the second air outlet channel, the other end of the first air vent is used for being connected with one air inlet end of the air pressure difference detection sensor, and the other end of the second air vent is used for being connected with the other air inlet end of the air pressure difference detection sensor.

The utility model discloses a pressure difference detection combined isolating valve, wherein, the outer edge of one end of a first air outlet channel and the outer edge of one end of a second air outlet channel both protrude out of the upper end surface of a base; the structure back of protrusion in the up end of base is all set up to the outward flange through the outward flange with first air outlet channel one end and the outward flange of second air outlet channel one end, after first piston of first cylinder drive moved down, the extrusion to sealed the pad can be realized better to the outward flange of first air outlet channel one end and the outward flange of second air outlet channel one end, so, sealed pad can realize the shutoff to the one end of first air outlet channel and the one end of second air outlet channel more reliably.

The utility model discloses a pressure differential detection combined type partition valve, wherein, the first sealing structure comprises a first sealing ring, an annular boss is arranged on the lower end face of the first valve seat, an annular groove is arranged on the upper end face of the base, the first sealing ring is embedded in the annular groove, the annular boss is inserted in the annular groove and is used for compressing the first sealing ring, and the first sealing ring is tightly attached and sealed with the annular groove and the annular boss; by adopting such a first sealing structure, the lower end of the first valve seat can be reliably sealed from the base after the first valve seat is assembled to the base.

The utility model discloses a pressure differential detection combination formula block valve, wherein, the second seal structure includes a plurality of second sealing rings that distribute along the axial direction of first piston, is provided with the annular caulking groove with every second sealing ring one-to-one on the outer wall of first piston, and every second sealing ring all inlays the dress in the annular caulking groove on the corresponding position, and every second sealing ring all hugs closely with the inner wall of first valve seat and the annular caulking groove on the corresponding position and seals; by adopting such a second sealing structure, the sealing between the first piston and the first valve seat can be reliably achieved.

The utility model discloses a pressure difference detection combined type isolating valve, wherein, the upper end of a first piston is provided with a T-shaped clamping groove, a T-shaped clamping block is arranged on the driving end of a first cylinder, and the clamping block is in fit joint with the clamping groove; after adopting this kind of structure, the upper end of first piston can link together with the drive end of first cylinder reliably, and when the drive end of first cylinder contracts, first cylinder can drive first piston and shift up, and when the drive end of first cylinder extended, first cylinder can drive first piston and move down.

The utility model discloses a pressure differential detection combination formula block valve, wherein, pressure differential detection combination formula block valve still includes second disk seat, second cylinder and second piston, the lower extreme of second disk seat is fixed on the base, the second cylinder is fixed with the upper end of second disk seat, the second piston can install in the second disk seat with vertical sliding, the upper end of second piston is fixed with the drive end of second cylinder, the lower extreme of second piston is provided with the inserted bar that the external diameter is less than the second piston, the outside cover of inserted bar is equipped with the sealing washer, be provided with third ventilation hole in the base, one end of third ventilation hole communicates with first outlet channel, after second cylinder drive second piston descends, the lower extreme of inserted bar is used for inserting in the other end of third ventilation hole, and the sealing washer is used for leaning on and shutoff third ventilation hole with the up end face of base, be connected with the exhaust joint on the lateral wall of second disk seat, after second cylinder drive second piston moved up, the exhaust joint is used for being communicated with the third vent hole through the second valve seat; after adopting this kind of structure, after the pipe fitting that is surveyed detects the completion, when second cylinder drive second piston upward movement, the shutoff to third ventilation hole can be relieved to the sealing washer, at this moment, the compressed air who fills in being surveyed the pipe fitting can be in proper order through first air outlet channel, third ventilation hole, second disk seat and exhaust joint discharge, so, be connected with the one end of gas blow pipe when exhaust joint, and when setting the one end of gas blow pipe in pipe fitting tip chamfer mechanism, the compressed air that blows off through the gas blow pipe can realize blowing off the metal debris in the pipe fitting tip chamfer mechanism, realized the reuse to compressed air promptly, in order to reach energy-conserving purpose.

The utility model discloses a pressure difference detection combined type isolating valve, wherein, the outer edge of the other end of a third vent hole protrudes out of the upper end surface of a base; after adopting this kind of structure, after second cylinder drive second piston moves down, the outward flange of third ventilation hole other end can realize the extrusion to the sealing washer better, so, the sealing washer can realize the shutoff to third ventilation hole better.

The pressure difference detection combined type partition valve of the utility model is characterized in that a fourth vent hole is also arranged on the base, one end of the fourth vent hole is communicated with the first air outlet channel, and the other end of the fourth vent hole is used for being connected with a barometer; by adopting the structure, the staff can clearly know the real-time air pressure in the first air outlet channel through the air pressure meter.

The utility model discloses can the simultaneous control to being surveyed the inflation of pipe fitting and standard pipe fitting and stop to aerify to have the simple advantage of control, and can simplify the structure of pipe fitting gas tightness check out test set.

Drawings

The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:

fig. 1 is a first schematic perspective view of the present invention;

fig. 2 is a schematic view of a second three-dimensional structure of the present invention;

fig. 3 is a schematic view of the structure of the present invention;

fig. 4 is a first schematic perspective sectional view of the present invention;

fig. 5 is a schematic perspective sectional view of the second embodiment of the present invention;

fig. 6 is a schematic sectional view of the present invention;

FIG. 7 is an enlarged view of the structure at A in FIG. 6;

FIG. 8 is an enlarged view of the structure at B in FIG. 6;

fig. 9 is a schematic diagram of the partially exploded perspective structure of the present invention.

Detailed Description

In the following description, numerous implementation details are set forth in order to provide a more thorough understanding of the present invention. It should be understood, however, that these implementation details should not be used to limit the invention. That is, in some embodiments of the invention, such practical details are not necessary. In addition, some conventional structures and components are shown in simplified schematic form in the drawings for the sake of simplicity.

In addition, the descriptions related to "first", "second", etc. in the present invention are only for description purposes, not specifically referring to the order or sequence, and are not intended to limit the present invention, but only to distinguish the components or operations described in the same technical terms, and are not to be construed as indicating or implying any relative importance or implicit indication of the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions in the embodiments may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should not be considered to exist, and is not within the protection scope of the present invention.

As shown in fig. 1-9, the differential pressure detecting combined type block valve of the present invention comprises a base 1, a first valve seat 2, a first cylinder 3 and a first piston 4; the lower end of a first valve seat 2 is fixed on a base 1, a first sealing structure is arranged between the lower end of the first valve seat 2 and the base 1, a cavity 5 is formed between the first valve seat 2 and the base 1, a first cylinder 3 is fixed at the upper end of the first valve seat 2, a first piston 4 is vertically slidably arranged in the first valve seat 2 in a penetrating manner, the lower end of the first piston 4 extends into the cavity 5, a second sealing structure is arranged between the first piston 4 and the first valve seat 2, the upper end of the first piston 4 is connected with the driving end of the first cylinder 3, an air inlet channel 11, a first air outlet channel 12 and a second air outlet channel 13 are arranged in the base 1, one end of the air inlet channel 11, one end of the first air outlet channel 12 and one end of the second air outlet channel 13 are all communicated with the cavity 5, the other end of the air inlet channel 11 is used for being connected with an air inlet pipe, the other end of the first air outlet channel 12 and the other end of the second air outlet channel 13 are respectively used for being connected with one end of a pipe fitting to be measured and one end of a standard pipe fitting, the lower end of the first piston 4 is embedded with a sealing gasket 41, after the first piston 4 is driven by the first cylinder 3 to move downwards, the sealing gasket 41 is used for abutting against the upper end face of the base 1 and for sealing one end of the first air outlet channel 12 and one end of the second air outlet channel 13, the base 1 is further provided with a first air vent 14 and a second air vent 15, one end of the first air vent 14 and one end of the second air vent 15 are respectively communicated with the first air outlet channel 12 and the second air outlet channel 13, the other end of the first air vent 14 is used for being connected with one air inlet end of the air pressure difference detection sensor, and the other end of the second air vent 15 is used for being connected with the other air inlet end of the air pressure difference detection sensor.

The outer edge of one end of the first air outlet channel 12 and the outer edge of one end of the second air outlet channel 13 both protrude out of the upper end face of the base 1; all set up to protrusion in the structure of the up end of base after through the outward flange with the outward flange of first air outlet channel one end and the outward flange of second air outlet channel one end, after first piston of first cylinder drive moved downwards, the extrusion to sealed the pad can be realized better to the outward flange of first air outlet channel one end and the outward flange of second air outlet channel one end, so, sealed pad can realize the shutoff to the one end of first air outlet channel and the one end of second air outlet channel more reliably.

The first sealing structure comprises a first sealing ring 21, an annular boss 22 is arranged on the lower end face of the first valve seat 2, an annular groove 16 is arranged on the upper end face of the base 1, the first sealing ring 21 is embedded in the annular groove 16, the annular boss 22 is inserted into the annular groove 16 and used for pressing the first sealing ring 21, and the first sealing ring 21, the annular groove 16 and the annular boss 22 are tightly attached and sealed; by adopting such a first sealing structure, the lower end of the first valve seat can be reliably sealed from the base after the first valve seat is assembled to the base.

The second sealing structure comprises a plurality of second sealing rings 42 distributed along the axial direction of the first piston 4, annular embedding grooves 43 corresponding to the second sealing rings 42 one by one are arranged on the outer wall of the first piston 4, each second sealing ring 42 is embedded in the annular embedding groove 43 at the corresponding position, and each second sealing ring 42 is tightly attached and sealed with the inner wall of the first valve seat 2 and the annular embedding groove 43 at the corresponding position; by adopting such a second sealing structure, the sealing between the first piston and the first valve seat can be reliably achieved.

A T-shaped clamping groove 44 is formed in the upper end of the first piston 4, a T-shaped clamping block 31 is arranged at the driving end of the first cylinder 3, and the clamping block 31 is matched and clamped with the clamping groove 44; after adopting this kind of structure, the upper end of first piston can link together with the drive end of first cylinder reliably, and when the drive end of first cylinder contracts, first cylinder can drive first piston and shift up, and when the drive end of first cylinder extended, first cylinder can drive first piston and move down.

The pressure difference detection combined type isolating valve further comprises a second valve seat 6, a second cylinder 7 and a second piston 8, the lower end of the second valve seat 6 is fixed on the base 1, the second cylinder 7 is fixed with the upper end of the second valve seat 6, the second piston 8 is vertically slidably installed in the second valve seat 6, the upper end of the second piston 8 is fixed with the driving end of the second cylinder 7, the lower end of the second piston 8 is provided with an insertion rod 81, the outer diameter of which is smaller than that of the second piston 8, a sealing ring 82 is sleeved outside the insertion rod 81, a third vent hole 17 is formed in the base 1, one end of the third vent hole 17 is communicated with the first air outlet channel 12, after the second piston 8 is driven by the second cylinder 7 to move downwards, the lower end of the insertion rod 81 is used for being inserted into the other end of the third vent hole 17, the sealing ring 82 is used for abutting against the upper end face of the base 1 and sealing the third vent hole 17, and an exhaust joint 61 is connected on the side wall of the second valve seat 6, after the second cylinder 7 drives the second piston 8 to move upwards, the exhaust joint 61 is used for communicating with the third vent hole 17 through the second valve seat 6; after adopting this kind of structure, after the pipe fitting that is surveyed detects the completion, when second cylinder drive second piston upward movement, the shutoff to third ventilation hole can be relieved to the sealing washer, at this moment, the compressed air who fills in being surveyed the pipe fitting can be in proper order through first air outlet channel, third ventilation hole, second disk seat and exhaust joint discharge, so, be connected with the one end of gas blow pipe when exhaust joint, and when setting the one end of gas blow pipe in pipe fitting tip chamfer mechanism, the compressed air that blows off through the gas blow pipe can realize blowing off the metal debris in the pipe fitting tip chamfer mechanism, realized the reuse to compressed air promptly, in order to reach energy-conserving purpose.

The outer edge of the other end of the third vent hole 17 protrudes out of the upper end face of the base 1; after adopting this kind of structure, after second cylinder drive second piston moves down, the outward flange of third ventilation hole other end can realize the extrusion to the sealing washer better, so, the sealing washer can realize the shutoff to third ventilation hole better.

A fourth vent hole 18 is further formed in the base 1, one end of the fourth vent hole 18 is communicated with the first air outlet channel 12, and the other end of the fourth vent hole 18 is used for being connected with a barometer; by adopting the structure, the staff can clearly know the real-time air pressure in the first air outlet channel through the barometer.

When the utility model is used, the other end of the air inlet channel is connected with the air inlet pipe, the other end of the first air outlet channel and the other end of the second air outlet channel are respectively connected with one end of a pipe to be tested and one end of a standard pipe, and the other end of the pipe to be tested and the other end of the standard pipe are in a blocked state; when the utility model works, the driving end of the first cylinder drives the first piston to move downwards to plug the sealing ring to realize the plugging of the third vent hole, then the driving end of the first cylinder drives the first piston to move upwards to plug the sealing gasket to remove the plugging of one end of the first vent channel and one end of the second vent channel, at the moment, the compressed air from the air inlet pipe can enter the cavity through the air inlet channel, the compressed air entering the cavity can be filled into the tested pipe fitting through the first vent channel, the compressed air entering the cavity can be filled into the standard pipe fitting through the second vent channel, after the air filling of the tested pipe fitting and the standard pipe fitting is finished (generally, the air filling of the tested pipe fitting and the standard pipe fitting can be finished through adopting a time delay mode), the driving end of the first cylinder drives the first piston to move downwards to plug the sealing gasket to realize the plugging of one end of the first vent channel and one end of the second vent channel, at this moment, the air inlet channel, one end of the first air outlet channel and one end of the second air outlet channel are not communicated with each other, then, the air pressure difference detection sensor starts to detect the air pressure difference between the first air outlet channel and the second air outlet channel, if the air pressure difference between the first air outlet channel and the second air outlet channel is smaller than a preset value, the detected pipe does not have the leakage condition (the leakage condition does not exist because of the standard pipe fitting), and if the air pressure difference between the first air outlet channel and the second air outlet channel is larger than the preset value, the detected pipe does have the leakage condition (the leakage condition does not exist because of the standard pipe fitting), so that the detected pipe is unqualified, and the unqualified pipe fitting can be placed in an unqualified area in the subsequent working process of the pipe fitting air tightness detection equipment; after the detection is completed, the second cylinder can drive the second piston to move upwards, when the second piston moves upwards, the sealing ring can remove the blockage of the third air outlet, and at the moment, the compressed air filled into the detected pipe fitting can be discharged through the first air outlet channel, the third air outlet, the second valve seat, the exhaust joint and the air blowing pipe in sequence, so that the compressed air blown out through the air blowing pipe can blow off metal fragments in the chamfering mechanism at the end part of the pipe fitting, namely, the compressed air is recycled, and the purpose of saving energy is achieved.

The above description is only for the embodiment of the present invention, and is not intended to limit the present invention. Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the claims of the present invention.

Claims

1. The utility model provides a pressure differential detection combination formula block valve which characterized in that: comprises a base (1), a first valve seat (2), a first cylinder (3) and a first piston (4); the lower end of the first valve seat (2) is fixed on the base (1), a first sealing structure is arranged between the lower end of the first valve seat (2) and the base (1), a cavity (5) is formed between the first valve seat (2) and the base (1), the first cylinder (3) is fixed at the upper end of the first valve seat (2), the first piston (4) can vertically and slidably penetrate through the first valve seat (2), the lower end of the first piston (4) extends into the cavity (5), a second sealing structure is arranged between the first piston (4) and the first valve seat (2), the upper end of the first piston (4) is connected with the driving end of the first cylinder (3), an air inlet channel (11), a first air outlet channel (12) and a second air outlet channel (13) are arranged in the base (1), one end of the air inlet channel (11) is connected with the driving end of the first cylinder (3), and the other end of the air outlet channel (11) is connected with the air inlet channel, One end of a first air outlet channel (12) and one end of a second air outlet channel (13) are communicated with a cavity (5), the other end of an air inlet channel (11) is used for being connected with an air inlet pipe, the other end of the first air outlet channel (12) and the other end of the second air outlet channel (13) are respectively used for being connected with one end of a tested pipe fitting and one end of a standard pipe fitting, a sealing gasket (41) is embedded at the lower end of a first piston (4), a first air cylinder (3) drives the first piston (4) to move downwards, the sealing gasket (41) is used for abutting against the upper end face of a base (1) and is used for sealing one end of the first air outlet channel (12) and one end of the second air outlet channel (13), a first vent hole (14) and a second vent hole (15) are further arranged on the base (1), and one end of the first vent hole (14) and one end of the second vent hole (15) are respectively connected with the first air outlet channel (12) and the second air outlet channel (13) And the other end of the first vent hole (14) is used for being connected with one air inlet end of the air pressure difference detection sensor, and the other end of the second vent hole (15) is used for being connected with the other air inlet end of the air pressure difference detection sensor.

2. The differential pressure detection combined type isolating valve as claimed in claim 1, wherein an outer edge of one end of the first air outlet channel (12) and an outer edge of one end of the second air outlet channel (13) both protrude out of the upper end face of the base (1).

3. The combined type partition valve for detecting differential pressure according to claim 1, wherein the first sealing structure comprises a first sealing ring (21), an annular boss (22) is arranged on the lower end face of the first valve seat (2), an annular groove (16) is arranged on the upper end face of the base (1), the first sealing ring (21) is embedded in the annular groove (16), the annular boss (22) is inserted in the annular groove (16) and is used for pressing the first sealing ring (21), and the first sealing ring (21) is tightly sealed with the annular groove (16) and the annular boss (22).

4. The combined type partition valve for detecting pressure difference according to claim 1, wherein the second sealing structure comprises a plurality of second sealing rings (42) distributed along the axial direction of the first piston (4), an annular caulking groove (43) corresponding to each second sealing ring (42) is formed in the outer wall of the first piston (4), each second sealing ring (42) is embedded in the annular caulking groove (43) in the corresponding position, and each second sealing ring (42) is tightly sealed with the inner wall of the first valve seat (2) and the annular caulking groove (43) in the corresponding position.

5. The combined type isolating valve for detecting pressure difference as claimed in claim 1, wherein a T-shaped clamping groove (44) is formed in the upper end of the first piston (4), a T-shaped clamping block (31) is arranged on the driving end of the first cylinder (3), and the clamping block (31) is in fit clamping connection with the clamping groove (44).

6. The differential pressure detecting combined type closing valve according to any one of claims 1-5, further comprising a second valve seat (6), a second cylinder (7) and a second piston (8), wherein a lower end of the second valve seat (6) is fixed on the base (1), the second cylinder (7) is fixed with an upper end of the second valve seat (6), the second piston (8) is vertically slidably installed in the second valve seat (6), an upper end of the second piston (8) is fixed with a driving end of the second cylinder (7), a lower end of the second piston (8) is provided with an insertion rod (81) having an outer diameter smaller than that of the second piston (8), a sealing ring (82) is sleeved outside the insertion rod (81), a third vent hole (17) is provided in the base (1), one end of the third vent hole (17) is communicated with the first vent passage (12), the second cylinder (7) drives the second piston (8) moves down, the lower end of the inserted rod (81) is used for being inserted into the other end of the third vent hole (17), the sealing ring (82) is used for being abutted against the upper end face of the base (1) and blocking the third vent hole (17), the side wall of the second valve seat (6) is connected with an exhaust joint (61), the second cylinder (7) drives the second piston (8) to move up, and the exhaust joint (61) is used for being communicated with the third vent hole (17) through the second valve seat (6).

7. The differential pressure detecting combined type block valve as claimed in claim 6, wherein an outer edge of the other end of the third venting hole (17) protrudes from an upper end face of the base (1).

8. The combined type isolating valve for detecting pressure difference as claimed in claim 1, wherein a fourth vent hole (18) is further disposed on the base (1), one end of the fourth vent hole (18) is communicated with the first air outlet channel (12), and the other end of the fourth vent hole (18) is used for being connected with a barometer.