refer to fig1 to 3 , which show that the gas switch 10 comprises a switch body 12 , a valve set 14 , a drive component 16 and a connecting component 18 according to one example of the preferred embodiment of the present invention . the switch body 12 consists of a base 22 and a cover 24 . inside the base 22 , there is a conical valve chamber 26 with an opening at one end and a gas intake channel 28 and a gas outlet channel 30 , both of which are connected through the conical valve chamber 26 , while the cover 24 is placed at one side of the base 22 , and at the side opposite to valve chamber 26 , there is a containing hole 31 and a guide 32 . and there is an inclining section 34 , a first flat section 36 , a declining section 38 and a second flat section 40 that reaches out around the containing hole 31 . the inclining section 34 gradually approaches the valve set 14 in a inclined way , while the declining section 38 moves gradually faraway from the valve set 14 in a inclined way . the valve set 14 can be installed rotatably inside the valve chamber 26 and includes a valve 42 , a pilot valve 44 , a leakage stopping component 46 and a spring 48 . and the valve 42 has a conical switch body 50 and a protrusive ring 52 that projects above one end of the switch body 50 , and there is a joint structure 53 between the switch body 50 and the protrusive ring 52 . on the axis of the switch body 50 , there is a through channel 54 divided into one part of big diameter 56 and the other part of small diameter 58 , and a control port 60 is formed in the place where the part of big diameter 56 and the other part of small diameter 58 are connected . besides , on the surface of the switch body 50 , a guide slot 62 is installed to connect the gas intake channel 28 and a gas intake hole 64 is set to connect the guide slot 62 with the part of small diameter 58 . the pilot valve 44 passes through the channel 54 of the switch body 50 , and includes a rod section 66 and a pushing control section 68 which is placed at one end of the rod section 66 to correspond with the control port 60 . the leakage stopping component 46 is equipped with an o - shaped ring and a circular gasket placed inside the joint structure 53 on the outward side of the rod section 66 . the spring 48 is fixed by a clamping component 74 at the external side of the rod section 66 and leans against the gasket , so that the control section 68 can seal the control port 60 when no pushing force is applied to the pilot valve 44 . the drive component 16 is installed on the cover 24 and comprises a rotating rod 76 , a guide rod 78 and a regulating block 80 , and can rotate and move through the containing hole 31 of the cover 24 to reach into the interior of the protrusive ring 52 of the valve 42 . on the rotating rod 76 , there is an axle hole 82 combined with one end of the pilot valve 44 to form an internal thread 84 , so as to allow the regulating block 80 to be movably installed inside and lean against the pilot valve 44 . the guide rod 78 is a round rod fixed on the rotating rod 76 and close to the surface of the guide 32 , so as to make it move on the surface of the guide 32 when the rotating rod 76 begins to revolve , thus causing the rotating rod 76 to generate axial displacement due to undulations on the surface of the guide 32 . the regulating block 80 is a bolt , and there is a connecting component 86 at one end of the bolt close to the pilot valve 44 . the connecting component 86 presents a roughly conical cross section in order to be connected with the valve 44 with low friction . the connecting component 18 consists of two circular contact plates 88 and 89 and a spring 90 . the two contact plates 88 and 89 surround the rotating rod 76 and the protrusive ring 52 of the valve 42 , while the spring 90 is linked with the two contact plates 88 and 89 at the external side of the rotating rod 76 and protrusive ring 52 , so that the valve set 14 can be rotated by the rotating rod 76 as it revolves . in addition , the gas switch 10 also includes a digital ignition 19 commonly seen in ordinary gas switches , which is installed on the cover 24 . the gas switch 10 of the present invention has the features as follows : when the drive component 16 is rotated , the guide rod 78 will move along the surface of the guide 32 , which will further cause the rotating rod 78 to generate axial displacement as there are undulations on the surface of the guide 32 . this will press the pilot valve 44 and change the space between the control section 68 and the control port 60 , thus altering the fire intensity smoothly . to put it in detail , as shown in fig4 and the a line of fig5 , when the gas switch 10 performs ignition actions ( generally rotate the rotating shaft by 90 degrees ), the drive component 16 will be rotated , pressing the guide rod 78 to move to the first flat section 36 along the inclining section 34 . so the drive component 16 will move towards and push the pilot valve 44 , causing the control section 68 not to seal the control port 60 any more . as a result , gas will be discharged through the guide slot 62 and gas intake hole 64 into the part of small diameter 58 , and further released out of the gas outlet channel 30 through the part of big diameter 56 for burning , as shown in fig4 . at this moment , the space between the control section 68 and the control port 60 reaches its maximum , hence the gas flows will reach its maximum and the fire intensity will be the highest , as shown in fig6 a and 6b . yet as the drive component 16 continues to be rotated by more than 90 degrees , the guide rod 78 will pass over the first flat section 36 and slide into the declining section 38 , as shown in fig6 c . in such cases , the drive component 16 will gradually move outwards due to effect of tensile force of the spring 90 in the connecting component 18 , causing the pilot valve 44 to move outwards , too , due to effect of tensile force of the spring 48 . this will lead to reduced space between the control section 68 and the control port 60 , as a result , the gas flows will gradually reduce and the fire intensity will grow weaker . when the drive component 16 is rotated by 270 degrees , the guide rod 78 will slide onto the second flat section 40 at the end of the declining section 38 , and the fire intensity will be kept at the lowest level , as shown in fig6 d . secondly , when the gas switch 10 is kept in the position of ultimate fire intensity ( lowest fire intensity ), the fire intensity cannot be changed or adjusted finely , because the space between the control section 68 and the control port 60 will not change any more . at this point , tools may be used to rotate the regulating block 80 so as to make it protrude or retract slightly , and then the pilot valve 44 will move backwards or forwards slightly due to effect of the pushing force from the regulating block 80 . in this way , the space between the control section 68 and the control port 60 can be enlarged or shortened slightly to increase or reduce gas flows , thus making the fire intensity become stronger or weaker and eventually achieving fine adjustment of fire intensity , as shown in the b and c lines in fig6 . as shown in fig7 , it may also be decided in the present invention that the cross section of the connecting component 86 of the regulating block 80 is roughly like a curve , in order to keep it also in the state of low - friction contact with the pilot valve 44 . this will prevent the cases where the regulating block 80 drives the pilot valve 44 to rotate as the drive component 16 rotates the valve set 14 and ensure that the structure works normally . it can be seen from the above descriptions that the gas switch described in the present invention relies on the synergy of the guide rod and the guide to make the drive component and the pilot valve move axially and very smoothly , and further cause linear changes in the process of adjusting firepower in different intensity , thus achieving good results in fine adjustment of fire intensity . besides , the valve set is rotated because of the effect of the driving force from the drive component , not because of that from the guide rod ; therefore the guide rod is not liable to wear and tear , thus securing smooth and linear change in the process of fire intensity adjustment . moreover , the regulating block can achieve the effect of adjusting the final fire intensity of the gas switch .