double block and bleed valve

double block and bleed valve

A valve is a mechanical device designed with the use to control the flow of the fluid including gas, liquid, fluidized solid and slurry. The flow can be started, stopped or blocked by the valve. A double block and bleed valve can also be called DBB valve. It is usually composed of two ball valves and one needle valve or two ball valves and one globe valve. With the use of double block and bleed valve, the dual isolation can be conveniently provided. The valve has many advantages, such as light weight and convenient installation. It is said that the installation of valve can only spend less time than that of general ones. It is necessary for the clients to maintain dual isolation which can ensure the smooth flow when the maintenance has to happen in the down stream of the first isolation valve. In addition, the double block and bleed valve can also realize the functions of chemical injection and sample points. The valve can also be equipped with in-built check valves.

The design of double block and bleed valve is based on the standards of API607 and BS6755PT2. There are also some special designs, such as injection quills, sample probes, double block and single block, in-built check valves and seat wipers. When the valve is operated, the temperature of media should be adjusted between -46 to 200 deg C. Shanghai Qiuyi Valve Co., Ltd. is professional in manufacturing all sorts of industrial valves and pipe fittings including double block and bleed valve. Therefore, various products can be provided for the potential clients.