Large-caliber safety blow-off valve

Abstract

The utility model belongs to the technical field of gas transmission and distribution equipment, and discloses a large-caliber safety blow-off valve. The main technical characteristics are as follows: a valve body with an air inlet, an air outlet and a valve port is included, the upper end of the valve body is connected with an adjusting shell through a connecting body, and the adjusting shell is provided with an upper shell, a lower shell, a diaphragm with a tray, an upper adjusting cavity, a lower adjusting cavity, an adjusting screw rod, an adjusting nut, a spring gland, a main adjusting spring, a breathing cap and an inlet pipeline connecting port; a valve rod with the bottom provided with a valve matched with the valve port penetrates through the connecting body and the lower adjusting cavity from bottom to top, the top of the valve rod is connected with a membrane with a tray, the connecting body comprises an outer connecting sleeve, an inner connecting sleeve and a connecting body pressing disc, the connecting body is provided with a balance membrane, a pressing piece, a pressing ring and a guide pipe, and a guide nut is arranged on the upper portion of the guide pipe. Guide pipe sleeves are arranged at the lower ends of the guide pipes. The large-diameter safety relief valve is simple in structure, large in displacement and high in safety.

Description

Technical Field

[0001] The utility model belongs to the technical field of gas transmission and distribution equipment, and in particular relates to a large-caliber safety relief valve. Background Art

[0002] The safety relief valve is a safety protection device in the gas transmission and distribution system, installed on the gas pipeline. When the monitored pressure exceeds the set value, the relief valve automatically opens and discharges the excess pressure to a safe area through the venting pipeline. When the monitored pressure returns to normal, the relief valve automatically closes. Currently, the low-pressure relief valves used are mostly small-caliber, and safety valves are generally used instead for large-caliber applications, and the safety relief performance is unstable. Utility Model Content

[0003] The technical problem to be solved by the utility model is to provide a large-caliber safety relief valve with large caliber, stable performance and simple structure.

[0004] In order to solve the above technical problems, the technical solution adopted by the utility model is as follows: comprising a valve body with an air inlet and an air outlet, a valve port is arranged in the valve body, the upper end of the valve body is connected to the regulating shell through a joint body, the regulating shell comprises an upper shell and a lower shell, a diaphragm with a tray is arranged between the upper shell and the lower shell, the diaphragm and the upper shell constitute an upper regulating chamber, the diaphragm and the lower shell constitute a lower regulating chamber, the upper regulating chamber is provided with an adjusting screw, an adjusting nut, a spring gland, a main adjusting spring, and a breathing cap, and the lower regulating chamber is provided with an inlet pipe connection port, The valve stem with a valve matching the valve port at the bottom passes through the joint body and the adjusting lower cavity from bottom to top, and the top of the valve stem is connected to the diaphragm with a tray. The joint body includes an outer connecting sleeve, an inner connecting sleeve, and a joint pressure plate. A balancing membrane is arranged between the outer connecting sleeve and the inner connecting sleeve, and the inner side of the balancing membrane is fixed to the inner connecting sleeve by a pressure plate, and the outer side of the balancing membrane is fixed to the outer connecting sleeve by a pressure ring. A guide tube matching the valve stem is arranged at the joint pressure plate, a guide nut is arranged on the upper part of the guide tube, and a guide tube sleeve is arranged on the lower end of the guide tube.

[0005] When a large-caliber safety relief valve provided by the utility model is used, the main adjustment spring is adjusted by the adjusting screw according to the relief setting value, so that the valve stem drives the valve to seal with the valve port. When the gas pressure value is less than the relief setting value, under the action of the main adjustment spring, the valve is sealed with the valve port, and the relief valve is in a closed state. When the gas pressure value is greater than the relief setting value, the gas pressure of the inlet pipeline is transmitted from the inlet pipeline connection port to the regulating lower chamber, and the gas force of the regulating lower chamber pushes the diaphragm upward to compress the main adjustment spring, the tray on the diaphragm drives the valve stem to move upward, the valve leaves the valve port, the relief valve opens, and the gas is discharged from the gas outlet to implement relief. After the relief is completed, the gas pressure value of the regulating lower chamber is less than the relief setting value, the main adjustment spring stretches and pushes the diaphragm downward, the tray on the diaphragm drives the valve stem to move downward, the valve closes the valve port, and the relief valve returns to the closed state. The balancing membrane is used to isolate the communication between the regulating lower chamber and the valve body, ensuring that the gas pressure of the inlet pipeline is transmitted from the inlet pipeline connection port to the regulating lower chamber. The inner side of the balancing membrane is fixed to the inner connecting sleeve by a pressing plate, and the outer side of the balancing membrane is fixed to the outer connecting sleeve by a pressing ring. The pressing plate and the inner connecting sleeve, and the pressing ring and the outer connecting sleeve are respectively connected by bolts. The large-caliber safety relief valve provided by the utility model has a simple structure, a large displacement, and high safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0006] Figure 1 This is a schematic diagram of the structure of a large-caliber safety relief valve of the utility model;

[0007] Figure 2 It is a structural schematic diagram of the valve stem;

[0008] Figure 3 It is a schematic diagram of the structure of the joint body. DETAILED DESCRIPTION

[0009] The specific structure of a large-caliber safety relief valve of the utility model is further described in detail below in conjunction with the accompanying drawings.

[0010] like Figure 1 As shown, the utility model is a large-caliber safety relief valve comprising a valve body 1, the valve body 1 having an air inlet 2 and an air outlet 3, a valve port 4 being arranged in the valve body 1, the upper end of the valve body 1 being connected to an adjusting shell 6 through a connecting body 5, the adjusting shell 6 comprising an upper shell 7 and a lower shell 8, a diaphragm 10 with a tray 9 being arranged between the upper shell 7 and the lower shell 8, the diaphragm 10 and the upper shell 7 forming an upper adjusting chamber 11, the diaphragm 10 and the lower shell 8 forming a lower adjusting chamber 12, the upper adjusting chamber 11 being provided with an adjusting screw 13, an adjusting nut 14, a spring pressure cover 15, a main adjusting spring 16, a breathing cap 17, and the lower adjusting chamber 12 being provided with an inlet pipe connection port 18.

[0011] like Figure 2As shown, a valve stem 20 with a valve 19 matching the valve port 4 at the bottom passes through the joint 5 and the regulating lower chamber 12 from bottom to top, and the top of the valve stem 20 is connected to the diaphragm 10 with the tray 9.

[0012] like Figure 3 As shown, the joint body 5 includes an outer connecting sleeve 21, an inner connecting sleeve 22, and a joint pressure plate 23. A balancing membrane 24 is arranged between the outer connecting sleeve 21 and the inner connecting sleeve 22. The inner side of the balancing membrane 24 is fixed to the inner connecting sleeve 22 by a pressing sheet 25, and the outer side of the balancing membrane 24 is fixed to the outer connecting sleeve 21 by a pressing ring 26. A guide tube 27 matching the valve stem 20 is arranged at the joint pressure plate 23, a guide nut 28 is arranged at the upper part of the guide tube 27, and a guide tube sleeve 29 is arranged at the lower end of the guide tube 27.

[0013] When a large-caliber safety relief valve provided by the utility model is used, the main adjustment spring 16 is adjusted by the adjusting screw 13 according to the relief setting value, so that the valve stem 20 drives the valve 19 to seal with the valve port 4. When the gas pressure value is less than the relief setting value, under the action of the main adjustment spring 16, the valve 19 is sealed with the valve port 4, and the relief valve is in a closed state. When the gas pressure value is greater than the relief setting value, the gas pressure of the inlet pipeline is transmitted to the regulating lower chamber 12 through the inlet pipeline connection port 18, and the gas force of the regulating lower chamber 12 pushes the diaphragm 10 upward to compress the main adjustment spring 16, and the tray 9 on the diaphragm 10 drives the valve stem 20 to move upward, the valve 19 leaves the valve port 4, the relief valve opens, and the gas is discharged from the gas outlet 3 to implement relief. After the relief is completed, the gas pressure value of the regulating lower chamber 12 is less than the relief setting value, the main adjustment spring 16 stretches downward to push the diaphragm 10, and the tray 9 on the diaphragm 10 drives the valve stem 20 to move downward, the valve 19 closes the valve port 4, and the relief valve returns to the closed state. The balancing diaphragm 24 is used to isolate the communication between the regulating lower chamber 12 and the valve body 1, ensuring that the gas pressure of the inlet pipe is transmitted to the regulating lower chamber 12 from the inlet pipe connecting port 18. The inner side of the balancing diaphragm 24 is fixed to the inner connecting sleeve 22 through a pressing plate 25, and the outer side of the balancing diaphragm 24 is fixed to the outer connecting sleeve 21 through a pressing ring 26. The pressing plate 25 and the inner connecting sleeve 22, and the pressing ring 26 and the outer connecting sleeve 21 are respectively connected by bolts.

[0014] The large-caliber safety relief valve provided by the utility model is not limited to the above-mentioned structure. Any modification, equivalent replacement and improvement made on the basis of the utility model should be included in the protection scope of the utility model.

Claims

1. A large-caliber safety relief valve, comprising a valve body with an air inlet and an air outlet, wherein a valve port is arranged in the valve body, and characterized in that: The upper end of the valve body is connected to the regulating shell through a joint body, the regulating shell includes an upper shell and a lower shell, a diaphragm with a tray is arranged between the upper shell and the lower shell, the diaphragm and the upper shell constitute an upper regulating chamber, the diaphragm and the lower shell constitute an adjusting lower chamber, the upper regulating chamber is provided with an adjusting screw, an adjusting nut, a spring pressure cover, a main adjusting spring, and a breathing cap, the adjusting lower chamber is provided with an inlet pipe connection port, a valve stem with a valve matching the valve port at the bottom passes through the joint body and the adjusting lower chamber from bottom to top, the top of the valve stem is connected to the diaphragm with a tray, the joint body includes an outer connecting sleeve, an inner connecting sleeve, and a joint body pressure plate, a balancing membrane is arranged between the outer connecting sleeve and the inner connecting sleeve, the inner side of the balancing membrane is fixed to the inner connecting sleeve by a pressing sheet, the outer side of the balancing membrane is fixed to the outer connecting sleeve by a pressing ring, a guide tube matching the valve stem is arranged at the joint body pressure plate, a guide nut is arranged at the upper part of the guide tube, and a guide tube sleeve is arranged at the lower end of the guide tube.

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