Vacuum Relief Valve (NK-BV11 Series)

INTRODUCTION
 Vacuum relief valves are used on liquid storage tanks and other process vessels or systems to prevent structural damage due to excess internal vacuum.Storage tanks are pressurized when liquid is pumped in, compressing the existing vapor or when rising temperatures cause increased evaporation or expansion of existing vapor.
 Conversely, a vacuum condition may be created when pumping out or due to falling temperature. To prevent tank damage, vapor must be allowed into or out of the tank at specified vacuum condition. The volume rate of venting depends upon the tank size, volatility of the tank contents, the pumping rates and the temperature.

DESIGN AND FUNCTION
 Tank protection equipment typically includes an operating valve, which is designed to provide vacuum relief under normal pump out and thermal breathing conditions

 

 

 

Model No	Type	Setting Pressure Range
NK-BV11W	Weight Loaded release to ATM	22 ~ 700 mmH2O
NK-BV11S	Spring Loaded to ATM	Above 700 mmH2O

 

 

 

VACUUM RELIEF

As a vacuum is drawn in the storage tank (for example, when fluid is being pumped out). When the vacuum setting is reached, the pallet lifts and air is drawn in the storage tank from the atmosphere.Model NK-BV11, NK-BV14 is designed for vacuum relief only. It has housing body and drip rings to protect seating surfaces from condensation and freezing. Valve size must be selected to perform required vacuum relief under operating and normal thermal conditions. Model NK-BV14 may be side mounted on the tank body or pipe away.

 

INSPECTION AND STORAGE
The vacuum relief valve is carefully packaged to prevent damage or contamination during shipping. Inspect all equipment when it is received: report any damage to the carrier immediately. The valve should be protected during handling and storage. Keep all the ports plugged to prevent intrusion of foreign materials. Before installation, inspect the unit for indications of physical damage or internal contamination. If these are observed, the valve must be disassembled, cleaned and repaired before installation.

 

DRAWING AND DIMENSION (NK-BV11W)  Unit : (mm)

 

 

SIZE	2"	3"	4"	6"	8"	10"	12"
I.D	50	80	100	150	200	250	300
H	235	265	335	435	480	525	610
L	315	385	435	555	675	770	885

 

 

DRAWING AND DIMENSION (NK-BV11S)  Unit : (mm)

 

 

SIZE	2"	3"	4"	6"	8"	10"	12"
I.D	50	80	100	150	200	250	300
H	235	350	420	500	528	660	790
L	315	385	435	555	675	770	885

 

• Storage Tank Accessory
• Tel : 82 55 762 0019 Fax : 82 55 762-2251
• Email:neotech@neotechkorea.com
• Name : KyungRo Lee

• Homepage : http://www.corpwin.com