12″ Cryogenic Prevalve
VACCO Industries
A 12-inch cryogenic prevalve developed by VACCO for the SLS Core Stage, controlling propellant flow and supporting chill down and safing of the Main Propulsion System.
Typed specifications22 values
Discloses 3 of 9 fields engineers filter by in this category (category median 3).
- Mass
- 42.64 kg converted from lb · datasheet p.3 45.36 kg weight
- Max operating pressure (MEOP)
- 12.41 bar product page 18.96 bar main valve operating pressure | 27.58–51.02 bar pneumatic actuator operating pressure | 91.01 bar
- Media / propellant
- cryogenic (LOX or LCH4 or LH2) LH2 (Type II) configuration · datasheet p.1 cryogenic (LOX or LCH4 or LH2) LO2 (Type I) configuration
- Component
- valve datasheet p.1
- Valve type
- other pneumatically actuated prevalve, segmented visor element · datasheet p.1
- Cycle life
- 1 000 product page
- Flight heritage
- visor design has a 25-year service record and is Space Shuttle qualified datasheet p.1
- Proof pressure
- 24.61 bar main valve · datasheet p.1 87.91 bar pneumatic actuator
- Burst pressure
- 28.48 bar main valve · datasheet p.1 117.21 bar pneumatic actuator
- External leak rate (as printed)
- GHe 300 SCIM; GH2 2,000 SCIM (at operating pressure, ambient) datasheet p.1
- Pressure drop at rated flow
- 0.017 bar LH2, at 15 psig inlet · datasheet p.1 0.034 bar LO2, at 45 psig inlet
- Response time
- 750 ms max · closing · datasheet p.1 1 500 ms max · opening
- Position indication
- yes electrical position indicator device signifies open or closed… · datasheet p.1
Each value is typed with its unit and measurement condition and cites the datasheet page it was taken from. Nothing is guessed: a field that is absent here has not been published by the manufacturer. machine-extracted ✓ checked by NewSpace Market ✓ manufacturer confirmed by the manufacturer.
As published by the supplier16 lines, in the manufacturer's own wording
- Product types
- Cryogenic ball valves; cryogenic fill & drain valves; cryogenic prevalves
- Featured product
- 12 in. cryogenic prevalve, SLS Core Stage
- Functions
- Propellant chill-down, engine flow control, MPS safing
- Flight heritage
- Apollo, Space Shuttle, Space Launch System (SLS)
- Operating pressure
- 1 x 10E-10 Torr to 120 psig
- Proof
- 180 psig
- Burst
- 300 psig max
- Operating control pressure
- 750 +/-50 psig norm
- Actuation control pressure
- 880 psig max
- Proof control pressure
- 1,320 psig max
- Burst control pressure
- 2,200 psig max
- Flow coefficient (Cv)
- 55.0
- Flow rate
- 153 gal/min., LH2 @ 50 psig min
- Pressure drop
- 1.5 psig max
- Weight
- 8.55 lb
- Life cycles
- 1000
About
VACCO’s 12″ Cryogenic Prevalve takes its heritage from the Space Shuttle Program and will fly aboard the Space Launch System (SLS) Core Stage. It is used within the Main Propulsion System (MPS) to support propellant system chill down, control propellant flow to the engines, and safe the MPS when necessary. VACCO is described as the premiere supplier of critical cryogenic and pneumatic space flight components to U.S. manned space and expendable launch vehicle programs, with products used throughout the MPS on programs such as Apollo, Space Shuttle, and now SLS. Due to VACCO’s large number of heritage designs, the company can provide qualified, flight-proven valves and controls for virtually every part of the MPS system, in many cases offering more than one technical approach to give customers greater flexibility in vehicle design.
Documentation
- 73325000_cryo_pv_12-inch.pdf PDF source: www.vacco.com ↗
- cryogenic_fd_valves.pdf PDF source: www.vacco.com ↗
- cryogenic_prevalves.pdf PDF source: www.vacco.com ↗
Need the full ICD, test reports or a specific revision? Ask the supplier directly.