Breathing valve is to maintain the tank pressure balance, reduce safety energy-saving products medium volatile, but also the use of principles of vapor heat transfer, protect the respiratory valve parts is not easy to freeze, the breathing valve to ensure the normal work.
    Breathing valve produced by our company has simplified structure, ventilation volume, less leakage, corrosion resistance, insulation etc.. The valve adopts polytetrafluoroethylene material, has the advantages of low temperature resistant, anti frost. The electrostatic protection device is provided with a respiratory valve, the valve and the tank to keep the same potential moment

VALVE DESIGN DATA
Size: 1/2"-20"
Operating pressure:
Type A：+355pa(+36mmH2O) -295pa(-30mmH2O)
Type A:+355pa (+36mmH2O) -295pa (-30mmH2O)
Type B：+980pa(+100mmH2O) -295pa(-30mmH2O)
Type B:+980pa (+100mmH2O) -295pa (-30mmH2O)
Type C：+1950pa(+200mmH2O) -295pa(-30mmH2O)
Type C:+1950pa (+200mmH2O) -295pa (-30mmH2O)
Type D: according to user requirement (special pressure rating
Nominal pres sure:  Class 150Lb PN1.6MPa
Material:  WCB,LCB,CF8,CF8M,CF3,CF3M,A105,LF2,F304,F316,F304L,F316L
Design & Manufacture Std.: API RP 2000、API520、API526  GB/T12243
Face to Face Std.: API RP 2000
End Connection Std.: ANSI B 16.5
Test Standard:  API RP 2000
API RP 2000 Venting Atmospheric and Low-Pressure Storage Tanks Nonrefrigerated and Refrigerated
API RP 520 Sizing Selection and Installation of Pressure - Relieving Devices in Refineries
API RP 521 Guide for Pressure-Relieving and Depressurizing System
API Std 526 Flanged Steel Safety - Relief Valves
API Std 527 Seat Tightness of Pressure Relief Valv
Std 620       Design and Construction of Large, Welded, Low-Pressure Storage Tanks
Std 650      Welded Steel Tanks for Oil Storage
Std 2510     Design   and   Construction   of   Liquefied Petroleum Gas (LPG) Installations
RP 576        Inspection of Pressure-Relieving Devices
Publ 2210     Flame Arresters for Vents of Tanks Storing Petroleum Products
RP 2350      Overfill Protection for Petroleum StorageTanks
Bull 2521    Use of Pressure-Vacuum Vent Valves for Atmospheric Pressure Tanks to Reduce Evaporation Loss
ANSI/ASME B16.5  Pipe Flanges and Flanged Fittings
ASME B31.3  Process Piping
ANSI/ASME B31.4  Pipeline Transportation System for Liquid Hydrocarbons and Other Liquids 

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