Double Block Valves-BB3 Series

There is a lot of misunderstanding surrounding the term double block-and-bleed (DBB) as used to describe valve functionality. It seems almost every valve buyer and manufacturer has a different idea of what the term means for valve selection, which can result in the wrong specifications or valve type. Some of this confusion in the oil and gas industry stems from the fact that there are two credible sources that define the term differently. “Another point of confusion comes when many people use the term double block-and-bleed when they really want a valve with capabilities of double isolation-and-bleed (DIB),” Ron Manson, Director of Applications Engineering, explains. These differences in definitions and terms are important when it comes to which valve capability to use in what type of system. .

“Whenever a customer says they want DBB, it is mainly based on the application and their past experience with what they consider DBB valves to be,” says Mike Hintz, District Manager for Engineered & Process Valves. “Based on customers’ preferred valve type and application, we can then offer ball, gate, or expanding plug valve options with DBB capabilities.”

There are two entities in the United States that define DBB – the American Petroleum Institute (API) and the Occupational Safety and Health Administration (OSHA). API is a trade organization that acts as an advocate as well as researcher for America’s oil and natural gas industry, outlining many industry guidelines for safe operation. OSHA is the branch of the United States Department of Labor that is charged with enforcing health and safety legislations, outlining legislation that protects both people and our environment.

Features

• It is a combination of needle & manifold valves thus redusing the number of joints.
• Spindle : ground and thread rolled.stem tip 17-4ph for long life.
• Dust cap protects stem threads from external contamination leak tight seal with low operating torque heat code traceability ball hard chrome plated for smooth opertions.

Testing

• Hydrostatic shell test is performed at 1.5 times the working pressure.
• Standard Test : each valves is tested with nitrogen at 1,000 psi for seat & packing leakage, with a max. Allowable leak rate of 0 .1 std. Cm3 / min.
• Optional test are available upon request

Testing

• Molybdenum disulphide (mos2)

Technical Specification

Material of Construction