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I have a D6 Moog proportional valve, only mechanical feedback, used on a 1977 Netstal Sycap system. the valve itself works well, the pilot system, flapper and nozzles, are leaking a lot. It looks like a seal on the flapper stem has failed, it does not seem to be repairable, so a exchange pilot part will be needed, likely. The Moog number is D632-1151. This valve is a repair item, changed in 1995, or there about. There is a similar (not identical) valve on the same machine, which has the numbers D06B116C. Can you offer a solution?Regards,Jos *******@*****.com