Thought that I would share with you the difference in sizes between the 10 & 20 hp Stanley throttle valve and the 30 HP Stanley throttle valve. How many have ever seen a 30 HP Stanley throttle valve? The castings are the same except that the outgoing steam line for the 30 HP Throttle Valve, its embossing for the tubing nut fitting is almost twice as big as the smaller valve's. I haven't had the 30 HP valve apart yet to see what the internal differences are.
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