Fill and Drain Service Valves

Electric and Chemical Propulsion

The Moog service valve design is a direct-acting, mechanically actuated device. The primary metal-to-metal seal provides leak-tight control for propellant or pressurant. Secondary redundant seals are provided by the combination of two dynamic stem seals, and by the fitting cap. A mechanical stop is provided to limit the opening stroke of the valve. An optional external cover is available that provides a tertiary seal, and protects the valve stem from potential handling damage, and or can provide a barrier to accidental cross connections.

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Key Advantages

Triple Redundant External Leakage Seals

- Primary Seal

- Metal to metal seat

- Secondary Seal – AN cap and redundant shaft seal orings

- Tertiary Seal – Cover with o-ring

Stainless Steel or Titanium Construction with EPR or KALREZ® Seals
Compatible with various gases and storable propellants
Easily adapted for mounting interface and tubing size

Characteristic	Low Pressure Stainless Steel with Cover	Low Pressure Titanium with Cover	High Pressure Stainless Steel	High Pressure Titanium with Cover
Max Operating Pressure, MEOP	650 psig (43.8 bar)	650 psig (43.8 bar)	5,000 psig (343.7 bar)	5,000 psig (343.7 bar)
Proof Pressure	975 psig (66.2 bar)	975 psig (66.2 bar)	7,500 psig (516.1 bar	7,500 psig (516.1 bar)
Burst Pressure	1,625 psig (111 bar)	1,625 psig (111 bar)	12,500 psig (860.8 bar)	12,500 psig (860.8 bar)
Flow and Pressure Drop	0.15 lb/s H20 20 psid; 3.4 scfm GHe at 650 psia and 10 psid		0.15 lb/s H20 @ at 40 psid; 51 scfm GHe at 4000 psia and 20 psid
Primary Seal Leakage, Internal/External	1E-6 scc/s	1E-6 scc/s	1E-6 scc/s	1E-6 scc/s
Secondary Seal Leakage, External	1E-5 scc/s	1E-5 scc/s	1E-5 scc/s	1E-5 scc/s
Tertiary Seal Leakage, External	1E-5 scc/s	1E-5 scc/s		1E-5 scc/s
Cycle Life	150 cycles	150 cycles	150 cycles	150 cycles
Weight	0.46 lbm (209 gram)	0.46 lbm (209 gram)	0.34 lbm (155 gram)	0.46 lbm (209 gram)
Operating Temperature Range	19 to 140ºF (-7.2 to 60ºC)	19 to 140ºF (-7.2 to 60ºC)	19 to 140ºF (-7.2 to 60ºC)	19 to 140ºF (-7.2 to 60ºC)
Representative Model Numbers	-050E880	-050E835	-050E873	-050E889