I. Overview 

 (QB2-10) mainly by the body of the exhaust valve, valve, cover, stem, float, exhaust nozzle and other components. Of principle: When you need to discharge the gas pipeline, should be counter-clockwise rotating stem, together with the valve stem to rise, so that the air inside the tubes of water into the body cavity under pressure and discharged from the exhaust nozzle, filled with water inside the tubes along the body cavity, so that the buoyancy of the float in the water under the action of moving up to the exhaust nozzle clogging, to self-sealing, pipeline in the normal line, the water under the action of air pressure constantly discharged into the the upper part of the body cavity of the exhaust valve, forcing the float down and leave the original sealing position, when the exhaust air and from the exhaust nozzle, along with the float has returned to its original position from the seal, therefore, exhaust valve in the valve during normal operation the door is always open, and float to repeat the above action, air is discharged, when the need for maintenance or cleaning the body cavity, because the valve closed. The exhaust valve, when the stem clockwise to close. Medium temperature :0-80 ℃ below the main part 




 Part Name Material 
 Body, bonnet gray iron, ductile iron 
 Stainless steel lever 
 Stainless steel float 



 Second, use and main performance specifications: 

 The valves are suitable for temperature less than 100 ℃ of water, hot water pipes to discharge all the air inside the tubes. 
 ⑴ Note: D> 350mm exhaust valve port line, please menu (QB1-10). 

 ⑵ install dual-port exhaust valve must be installed under a protective valve, ball valve (Q41F-16), so as not to test without water. 

 ⑶ For side demand side of the exhaust valve flange sizes, such as changes in the contract specify flange size. 

 The exhaust valve for water, hot water, the maximum temperature of 100 ℃ pipe, so that all the exhaust gases inside the tubes. 




 Third, the dual-port exhaust valve key and Connection Dimensions 
 Model DN main dimensions (mm) 
 D D1 D2 L Z-φd medium body material 
 QB2-10 40 145 110 85 430 4-φ18 cast iron water 
 QB2-10 50 160 125 100 430 4-φ18 cast iron water 
 QB2-10 75 195 160 135 470 4-φ18 cast iron water 
 QB2-10 100 215 180 155 500 4-φ18 cast iron water 
 QB2-10 150 280 240 210 540 8-φ20 cast iron water 
 QB2-10 200 335 295 265 700 8-φ20 cast iron water 


 Fourth, QB2-10 dual-port exhaust valve displacement table per hour 
 Specifications 5075100150200 
 M / h 4-173 85-35214-597 22-90427-1145