NASA/George C. Marshall Space Flight Center, Procurement Office, Marshall Space Flight Center, AL 35812

48 -- GASEOUS NITROGEN CONTROL VALVE SOL 8-1-9-21-C4647 DUE 091399 POC Barbara L. Kent, Contract Specialist, Phone (256) 544-0353, Fax (256) 544-8688, Email barbara.kent@msfc.nasa.gov -- David. G. Morgan, Contracting Officer, Phone (256) 544-0410, Fax (256) 544-8688, Email david.morgan@msfc.nasa.gov WEB: Click here for the latest information about this notice, http://nais.nasa.gov/EPS/MSFC/date.html#8-1-9-21-C4647. E-MAIL: Barbara L. Kent, barbara.kent@msfc.nasa.gov. Gaseous Nitrogen Control Valve. The purpose of this modification is to address questions in regard to solitation 8-1-9-21-C4647. QUESTION: You mention Trim Material to be Teflon and 316SS; you also mention Leakage: ANSI Class IV. Is there to be what is commonly known as a "Soft Seat" of Teflon which relates to Class VI (or Class Six) ANSI Leakage rather than Class IV (or Class Four) ANSI Leakage normally achieved with metal to metal seating (or hard seat)? ANSWER: Leakage specification shall be "ANSI CLASS 6." QUESTION: Could you clarify what the outlet operating pressure or pressure drop is in the valve? ANSWER: Pressure drop in the valve should allow the valve to flow 100 LBS/SEC with an inlet supply pressure range of 2000 to 4000 PSIG. Posted 09/02/99 (D-SN376055). (0245)

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