1. Characteristics of product:
The valve is the ventilation device fixed on the top of the tank. To reduce the evaporation loss, control the tank pressure and keep the pressure balance. At the same time, to prevent the outside effect of flame spread. The valve has a lot of characteristics, such as a large amount of ventilation, a small amount of leakage, corrosion resistance and so on. It has the electrostatic grounding wire, so that the valve and the tank to keep other potential. The operating pressure range: positive pressure: 353Pa (36mmH2O) 980Pa (100mmH2O): 295Pa (30mmH2O), negative pressure breathing valve products to meet the requirements of SY/ T0511-1996 standard, divided into common type and all-weather type two series and A, B, C three operating pressure: A: -295pa +355pa, B: -295pa +980pa, C: -295pa - +1765pa.

2. Ordering instruction:
2.1 Please indicate the order products are all-weather type (Q) or ordinary type (P) according to product specification statements, and indicate the pressure level and specifications of the products.

2.2 The valve key part of products made of polytetrafluoroethylene material. When using, positive and negative pressure valve can not open at the same time. Therefore, in the storage and transportation, the installation should avoid products will be inverted and the violent collision.

2.3 Every six months to product positive, negative valve sliding properties and the fire retardant core to conduct a clean-up cleaning and inspection. Open the normal and fire resistance performance to ensure.

2.4 Please indicate the product name, type, specifications and so on when ordering.

3. Technical parameters: