Transflow valve with an isolation and switching mechanism for double block and bleed arrangement

摘要

A transfer valve system includes an improved double block and bleed transflow valve system which uses six valves and uses one single spindle interconnecting the inlet and outlet transflow valves, which valves also drive a gear train mechanism connecting all six valve stems. As such, by operating one main spindle connected to the two inlet and outlet transflow valves, all six valves of this double block and bleed configuration operate simultaneously and assure an uninterrupted flow of fluid from one device to another standby device. The transflow valve system also is formed of separable components to form both single and double block and bleed configurations.

主权项

1. A transflow valve system comprising:
a first system device having a respective inlet and outlet for fluid; a second system device having a respective inlet and outlet for fluid; and a double block and bleed transflow valve assembly which comprises an inflowing first valve and an outflowing second valve which are connected to a main inlet and outlet for fluid and have a common spindle interconnecting the first and second valves to actuate said first and second valves by rotation of said spindle, said transflow valve assembly comprising third and fourth valves connected between the inlet and outlet of the first system device and the first and second valves, and fifth and sixth valves connected between the inlet and outlet of the second system device and the first and second valves, said first, third and fifth valves being operatively interconnected by a first set of gears and said second, fourth and sixth valves being operatively connected by a second set of gears, said first and second sets of gears being connected to said spindle and being operated by rotation of said spindle to simultaneously actuate each of said first to sixth valves between first and second operative conditions which direct fluid flow either to said first system device or said second system device to assure an uninterrupted flow of fluid from when switching between said first and second system devices.