Valve associations usually choose to follow either API's or OSHA's definition, but some have created their own handbook with their own definitions for industry terms. By combining two valves into one body, a twin-valve design reduces weight and potential leaks paths while meeting the OSHA requirements for double block and bleed. There are some valves that utilize a twin-valve design. API allows DBB valves to be one single valve with two unidirectional seats, while the OSHA standard can only be achieved with two separate valves with a method to bleed pressure in between. In contrast, OSHA describes DBB as 'the closure of a line, duct, or pipe by closing and locking or tagging two inline valves and by opening and locking or tagging a drain or vent valve in the line between the two closed valves.'ĪPI's DBB definition does not achieve the same level of isolation as OSHA's. According to API, a DBB 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 venting/bleeding the cavity between the seating surfaces.' API also notes in this definition that this valve does not provide positive double isolation when only one side is under pressure. If you have any questions, please email us at 24/7 or call 88 Mon-Fri 10AM-6PM MST, Sat 10AM-5 PM MST, closed Sun.There are two entities in the United States that define DBB-API and OSHA. Thank you for reading and we wish you well. Lastly, don't forget to stay in close contact with friends and family, especially those isolated.

It certainly helps with stress and anxiety during difficult times. If you can get out and walk, hike or ride, then take advantage of it. We hope that this horrible situation ends soon and that everyone takes care of themselves both mentally and physically. We are committed to slowing the spread of Covid-19, and to keep our customers, employees, and communities safe. Call ahead for curbside pickup or come to front door and we will grab your order for you. For local online customers, you can pick up your will-call orders at Peak Cycles. We have experienced very few delays for most of our US customers over the 2 weeks. We are not allowing any bike rentals or demos until further notice.įor online customers, is running at normal capacity as are our shipping companies USPS and Fedex. Our service department is also performing pick-up and drop-off of repair bikes outside. We have a table and bike stands in front of the shop so we can bring products and/or bikes to you outside for purchase. Due to Covid-19 we are not allowing any customers into the shop at this time. In our Peak Cycles bike shop in Golden, Colorado we will continue to perform bike repairs and sales.

We are taking every precaution necessary to remain open. We will remain open under normal business hours until further notice. On behalf of Peak Cycles and we hope that everyone is safe and well.

Dual xloc bleed