Low Pressure Flow Control and Isolation Valves

ECLSS Low Pressure Flow Control and Isolation Valves

刘玥首次大战黑人produces a variety of fluid control听components used in human space vehicles as听part of their environmental control and life听support systems (ECLSS). The components听include mechanical pressure regulators, manual听and electrically actuated valves, and passive听components such as quick disconnects. These听components are used in high- and low-pressure听breathing gas control systems, as well as听liquid fluid control for thermal management.

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Key Features

Low pressure O₂ and fluids at 14.5 psi to 145 psi, with gas mass flow rates of听0.011 lbm/sec (O₂), liquid mass flow rates of 0.1 lbm/sec (H₂O), and volumetric flow听rates of >170 ACFM O₂

Electrically-actuated valves are 28 VDC devices that use brushless DC motors and听solenoids to drive the units open or closed, and include normally-open / normallyclosed and latching designs. Certain designs provide position indication capability.

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Valve	Model 52-307 & 52-311,听 52E341 & 52E342 2- and 3-way Isolation Valves	Model 50-1474 2-way Isolation Valve听 w/Manual Override	Model 50-1396听 Motorized Ball Valve 鈥� 1.5鈥�	Model 50-1395听 Motorized Ball Valve 鈥� 2.0鈥�
Description	Torque motor design, latching	Torque motor design, latching,听 manual override	Ball valve, BLDC actuated	Redundant Ball valve,听 BLDC actuated
Media	Oxygen, Ammonia,听 Propylene Glycol, Urine	Oxygen and Nitrogen	Oxygen	Oxygen
Unit Mass	3.4 lbm	4.0 lbm	4.75 lbm	14.5 lbm
Dimensions (L W H)	4.8鈥� x 2.3鈥� x 4.5鈥�	4.8鈥� x 2.3鈥� x 5.0鈥�	5.4鈥� x 3.9鈥� x 5.1鈥�	10.4鈥� x 6.2鈥� x 9.6鈥�
MEOP	145 psia	145 psia	23.5 psia	8.6 psia
MDP	145 psia	145 psia	23.5 psia	8.6 psia
Factors of Safety	Proof: 1.5x MEOP;听 Burst: 2.5x MEOP	Proof: 1.5x MEOP;听 Burst: 2.5x MEOP	Proof: 1.5x MEOP;听 Burst: 2.5x MEOP	Proof: 1.5x MEOP;听 Burst: 2.5x MEOP
Design Pressure Drop	0.88 psid H₂O听 @ 70掳F & 0.1 lbm/sec	0.9 psid	0.8 psid	0.025 psid
Design Flowrate	0.1 lbm/sec H₂O @ 70掳F	0.018 lbm/sec N₂; 0.01 lbm/sec O₂	675 lbm/hr Air @ 14.9 psia, 80掳F	78 ACFM Air @ 14.7 psia, 75掳F
Leakage 鈥� Internal (@ MDP, GHe)	< 1 x 10^-3 scc/sec	< 1 x 10^-3 scc/sec	< 1 x 10^-2听scc/sec	< 5 x 10^-3 scc/sec
Leakage 鈥� External (@ MDP, GHe)	< 1 x 10^-3 scc/sec	< 1 x 10^-3 scc/sec	< 1 x 10^-3 scc/sec	< 1 x 10^-3 scc/sec
Temperature (Operating)听	-40掳F 鈥� 160掳F	-40掳F 鈥� 160掳F	-15掳F 鈥� 160掳F	+5掳F 鈥� 150掳F
Random Vibration	83 Grms	22 Grms	10.35 Grms	2.86 Grms*听 (analysed to 61.48 Grms)
Shock	3588 G	2100 G	3500 G	5500 G
Cycle Life	900 cycles	13000 cycles	900 cycles	860 cycles
Wetted Materials	CRES, PTFE	CRES, PTFE	Aluminum, CRES, PTFE	Aluminum, CRES, PTFE
Filtration	55 micron absolute	N/A	N/A	N/A
Response Time (Open/Close)	100 milliseconds	100 milliseconds	2 sec	2.5 sec
Operating Voltage	26 卤 1 VDC	28 VDC	28 VDC	21 鈥� 26 VDC
Current Draw	0.6 Amp	0.6 Amp	0.45 Amp min,听 controller limited	0.625 Amp min,听 controller limited
Position Indication	No	Yes	No	No