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Steam valve replacement washer profile

I have to replace the main washer in several old steam valves, but I'm not sure the replacement should look like. The surface at the end of the valve stem where the washer sits is rounded (concave) rather than flat. Do I need to match this profile, or will a flat rubber washer do?




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Comments
Yours, Larry
18 Ounce per Square Inch Gauge
Time Delay Relay in Series with Thermostat
Operating Pressure 0.3-0.5 Ounce per Square Inch
Yours, Larry