China Double block and bleed valve manufacturer

Shanghai Huixuan is China Double block and bleed valve manufacturer,factory and supplier, China DBB ball valve manufacturer,factory and supplier for Carbon Steel, Stainless Steel, Alloy Steel Double block and bleed valve from 150 to 3000 LB,3000 to 15000 PSI Pressure class.

Double block and bleed Ball Valve introduction
Double block and bleed Ball Valve is mainly suitable for the instrumentation but is also required as an alternative to the in-line installation of two valves.Double block and bleed Ball Valve is possible to have the same result reducing costs,  overall dimensions and the ability to bleed off the plant, by controlling a potential leakage of the plant.Trunnion mounted DBB ball valve is recommended for any pressure class and ensure long-lasting seal.They can be supplied both in the Trunnion and in the Floating version.

Double block and bleed Ball Valve is the abbreviation for the double block and bleed ball valve.some of Double block and bleed Ball Valve has two balls and one or two needle valves,the two ball valves can opend and closed the medium and two needle valves can discharge pressure of the valves,the ball valve is designed to replace the complex form of the connection of multiple valves in traditional pipes,so as to reduce leakage points in the system and realize fast discharging and closing.Double block and bleed Ball Valve saves the installation procedures,reduces pressure in the pipe system,facilities instrument cleaning and maintenance and lowers the cost.

Double block and bleed Ball Valve is a "single valve with two seating surfaces that, in the closed position, provides a seal against pressure from both ends of the valve with a means of vending/bleeding the cavity between the seating surfaces."

This trunnion ball valve provides double block and bleed in a single valve. This style can isolate piping on both sides of the valve (uni-directionally) to vent/bleed the valve cavity between the seats.

Using a single double block and bleed valve system versus 3 separate valves saves installation time, weight on the piping system, and space. It also cuts down the number of leak paths to the atmosphere, reducing the risk of hazards when transferring liquids dangerous to humans or the environment.

Double block and bleed Ball Valve specification
Body material: Carbon Steel, Stainless Steel, Alloy Steel.
Normal diameter: 1/2 - 24 Inch (DN15 - DN600).
End connection: Flanged X Flanged,Flanged X Threaded
Pressure range: 150 - 3000 LB/ 3000-15000 PSI.
Working temperature: -46℃ - +350℃.
Structure: (ball/needle/ball), Reduce Bore, One Piece Body.
Design: EEMUA 182, ASME B16.34.
Body Pattern: Three Piece.
Face to face: as per manufacturer's standard.
Test and inspection: EEMUA 182, API 598.
Operation: lever.

Double block and bleed Ball Valve feature
Wide range of materials of construction available
EEMUA 182, ASME B16.34 Design
Full Bore And Reduced Bore Design
Flanged, Welding, Hub, Threaded Ends
Anti Blow‐Out Stem
Anti Static Device
Fire Safe Design

Double block and bleed Ball Valve application 

Double block and bleed Ball Valve is most commonly used in the oil and gas industry, but can also be helpful in many other industries.

It's typically used where bleeding the valve cavity is required, where piping needs isolation for maintenance, or for any of these other scenarios:

Prevent product contamination
Remove equipment from service for cleaning or repair
Meter calibration
Liquid service near waterways or municipalities
Transmission and storage
Chemical injection and sampling
Isolate instrumentation such as pressure indicators and lever gauges
Primary process steam

Double block and bleed Ball Valve product show