LIQUID-PROPELLANT ROCKET ENGINE DRAIN SYSTEM Russian patent published in 2016 - IPC F02K9/42 F02K9/60 

FIELD: engines and pumps.

SUBSTANCE: claimed invention can be used in drain systems for removal of fuel component, vapours and other waste leaks occurred at the engine operation. Claimed system comprises the cases of drain units, pipeline fittings welded thereto, preservation plugs fitted in the cases, rubber shims, cover and plate. Said drain pipes are integrated into two sets, i.e. oxidizer and fuel, and jointed to the angle pieces at oxidizer and fuel drain box cases, respectively. Note here that said detachable preservation plugs are secured at said cases by threaded fasteners and sealed by means of sealing shims. Cylindrical bores are made at the inlet of said angle pieces, their surface roughness H9 making at least 0.8, to coupled the bench pipe adapters provided with seal rings. The thread is made outside the flange at the fuel drain box outlet for temporary plug to be screwed thereon. The collar with six threaded bores for fastening screws and temporary plugs is arranged outside the flange at the fuel drain box outlet.

EFFECT: better filling with the fuel.

3 cl, 22 dwg