PBb series

Positive pressure explosion-proof distribution board

1. It is widely used in flammable and explosive gas environment such as oil exploitation, refining, chemical industry, offshore oil platform, oil tanker, etc. It is also used in flammable dust places such as military industry, port, grain storage and metal processing;

2. Applicable to Zone 1 and Zone 2 of explosive gas environment;

3. Applicable to IIA, IIB, IIC explosive gas environment;

4. Applicable to areas 21 and 22 of flammable dust environment;

5. Applicable to the temperature group is T1 ~ T4 / T5 / T6;

6. For power distribution of lighting or power lines, electrical equipment on/off control; also as a central signal processing system and central control system.

Model Implication



1. The principle adopts medium isolating ignition to avoid explosion of electrical equipments;

2. The products can be fixed with inspection meter, analysis meter, vision meter, monitor, Micro-computer touch screen, high power ransducer and other electric components, the inside components are unlimited;

3. It is composed of board, body automatic control system, air arrangement system, alarm system and distribution system, the body is composed of positive pressure chamber and subsidiary chamber, there is a self-control system, alarm system and cable in the subsidary chamber, other distribution system components are in the positive pressure chamber;

4. There are box style, musical plate style and board style, the board style are divided into fluctuated structure and right and left structure. For the box style, the body is welded by steel plate and sprayed with plastic, operated through the front door the board shelf of musical plate and board style is welded by standard profiled bar, surface is sprayed with plastic, the joint plane is handled with sealing, treatment operating from frontal door and maintaining from back door, Normally we select cold cast steel, also can select stainless;

5. There are ventilation and compensation entry ways, ventilation entry is used for continue air feed, the heat in pressure chamber can be sent out. It's also with good heat diffusing function, the compensation entry is for discontinuity air feed, the press chamber is with perfact sealing and low gas comsumption functions;

6. The user must supply clear air or nitrogen, gas pressure: 02.MPa〜0.8MPa, satisfy the locale requirement, we can design the gas supply system on request.

Main Technical Parameters


Order Note

1. Parameters of these series products are only for reference, users can select structure size according to inside components size. Please contact with our technical department if you’re not clear about the parameters or have special requirements, all the parameters shall be subjected to the name plate and documentation;

2. When order ,please provide requirement of electric system diagram, control principle diagram, panel location diagram and other components size, the entry cable size and quantity must be supplied parameters ;

3. The original design draft must be audited by users, and they will be put into producing after user`s conformation;

4. Gas source and external gas pipe of this product are offered by user, if need our company to supply these, please indicate when order, customer shall pay extra costs for the gas supply facilities.

5. It's made of cold casted steel, the surface is sprayed with plastic; please indicate it if you need stainless steel material;

6. Products are updating without notification,because of the need of our company development.