Pressure Relief Valve NK-BV13 Series

INTRODUCTION
Pressure relief valves are used on liquid storage tanks and other process vessels or systems to prevent structural damage due to excess internal pressure. 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.
To prevent tank damage, vapor must be allowed into or out of the tank at specified pressure condition. The volume rate of venting depends upon the tank size, volatility of the tank contents, the pumping rates and the temperature.

Breather Valve

MODEL NAME : NK-BV13 SERIES

DESIGN AND FUNCTION

Model No.

Type Material

Setting Pressure Range

NK-BV13W

Weight Loaded release to ATM Aluminum, Carbon Steel, Stainless Steel

22 ~ 700 mmH2O

NK-BV13S

Spring Loaded to ATM Aluminum, Carbon Steel, Stainless Steel

Above 700 mmH2O

Note) Other specification to be consult by factory.

Tank protection equipment typically includes an operating valve which is designed to provide pressure relief under normal pump in thermal breathing conditions.

Pressure Relief
As the pressure in the storage tank increases. When the set pressure is reached, the pressure pallet lifts and relieves to atmosphere (or to a header if it a pipe away valve).   Model NK-BV10, NK-BV13 of quick-opening type is designed for emergency relief of pressure above capacity that supplied by a standard operating valve used on tanks, piping and low pressure vessels. It provides relief from excessive internal pressure that may cause tank damage. Model NK-BV10, NK-BV13 has self-draining housing body and drip rings to protect seating surfaces from condensation and freezing.
Model NK-BV13 is for use where pressure relief is required and all relieving vapors must be piped away.

pressure vacuum valve 02

NK-BV10W

NK-BV10S

pressure vacuum valve 04

NK-BV13W

NK-BV13S

INSPECTION AND STORAGE
The pressure 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

SIZE I.D1 I.D2 H1 H2 L1 L2
2” x 3” 50 80 251 100 248 150
3” x 4” 80 100 309 120 258 160
4” x 6” 100 150 379 145 360 220
6” x 8” 150 200 489 180 380 240
8” x 10” 200 250 532 215 420.5 253
10” x 12” 250 300 623 265 491 298
12” x 14” 300 350 686 285 548 330

UNIT : mm

SIZE I.D1 I.D2 H1 H2 L1 L2
2” x 3” 50 80 280 100 248 150
3” x 4” 80 100 340 120 258 160
4” x 6” 100 150 400 145 360 220
6” x 8” 150 200 489 180 380 240
8” x 10” 200 250 550 215 420.5 253
10” x 12” 250 300 623 265 491 298
12” x 14” 300 350 700 285 548 330

UNIT : mm