US 11,808,365 B2
Valve system configured to prevent corrosion at process liquid/vapor interface
Paul Jeffrey Parish, Spanish Fork, UT (US); and Michael P. Nelson, Lehi, UT (US)
Assigned to Flowserve Pte. Ltd., Singapore (SG)
Filed by Flowserve Pte. Ltd., Singapore (SG)
Filed on Sep. 27, 2021, as Appl. No. 17/485,666.
Prior Publication US 2023/0099720 A1, Mar. 30, 2023
Int. Cl. F16K 24/02 (2006.01); F16K 1/54 (2006.01); F16K 39/02 (2006.01); F16K 37/00 (2006.01)
CPC F16K 1/54 (2013.01) [F16K 24/02 (2013.01); F16K 37/0066 (2013.01); F16K 39/026 (2013.01); F16K 2200/402 (2021.08)] 17 Claims
OG exemplary drawing
 
1. A valve system configured for controlling a flow of a corrosive process liquid, a liquid/vapor interface of the process liquid being more highly corrosive than either the process liquid or the vapor thereof when considered separately, the valve system comprising:
a valve having an internal process liquid volume that is normally filled with the process liquid during operation of the valve;
a purge port provided in the valve, the purge port enabling liquid communication between the internal process liquid volume and an external purge line;
a vertical segment included in the purge line, said vertical segment being constructed from or lined with a material that is resistant to corrosion due to contact between the vertical segment and the liquid/vapor interface of the process liquid;
an interface level sensor configured to determine a level of the liquid/vapor interface within the vertical segment; and
a non-reactive gas source configured to fill a downstream segment of the purge line that is downstream of the liquid/vapor interface with a non-reactive gas having a backpressure that causes process liquid entering the purge line to enter into the vertical segment, while preventing the process liquid from flowing beyond the vertical segment.