Are rollers and scrapers used in large diameter (>12")resilient seat gate valves that are mounted horizontally? I know they were used in double disc, but what about resilient seat?What happens to sediments that might deposit on the seating surface? How is this removed?What type of gate valve and for what purpose?Depending of service type, pressure and fluid, you would be able to select from a wide range of constructions. The upper end being special construction knife-gate or o-port all stainless steel valves for high-pressure, high temperature liquids with a high degree of solids sticking on the blade. Built in scraper effects in sealing constructions.The application is a raw water intake from a Ranney collector well (riverbed filtered river water). Temperature is 40-60F and max pressure is ~140 psi. Pretty standard water utility application (sorry, kinda boring).I am just worried about sand and sediment that will pass through into the collector wells and that might settle in the water main.We are using resilient wedge gate valve. In the past, the double disc had a roller and scraper, where as the resilient wedge does not. My question is should I be worried about sediment in the seat not allowing the valve to be bubble tight. Maybe my concern is unwarrented.

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