The US Pipeline & Hazardous Materials Safety Administration issued a final rule on Oct. 7 for excess flow valves on new and replaced distribution pipelines. The final ...

The rule becomes effective in April 2017. Excess flow valves were already required for new and replaced single-family residence gas service supply lines, according to NTSB.

Flow is controlled by either throttling or diverting it. Throttling involves reducing orifice size until all of the flow cannot pass through the orifice; bypassing involves routing part of the flow ...

In August’s column, I discussed three-way control valves, their associated bypass pipes, and the importance of a balancing valve being located within the bypass pipe. Such balancing valves are needed ...

Hyundai Motor has patented a valve recovery control apparatus for hydrogen tanks, ensuring stable hydrogen supply to fuel cells. The system suspends fuel cell operation if the excess flow valve is ...