Dual Line Isolation Latch Valves

Moog torque motor valves, originally developed for Galileo, LEASAT, INSAT, and Minuteman, have been in production for more than four decades. The latch valve is a bi-stable design that will stay in the last open or closed commanded position. The valve design utilizes a single torque motor and command signal to control two separate, hermetically sealed pressurant or propellent lines.

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Features

Literature

Key Advantages

All welded design to prevent external leakage
PTFE seal and stainless steel construction
Direct microswitch position indication
Transition tubes available for stainless to titanium

Valve	Model 51-138, 51-235 1/4” Line, Torque Motor, Stainless Steel
Max Operating Pressure, MEOP	298 psia (20.5 bar)
Proof Pressure	685 psia (47.2 bar)
Burst Pressure	1600 psia (110 bar)
Back Pressure Relief (BPR)	30-200 psid (1.4 – 13.8 bar)
Max Delta P	5 psid at 0.022 lbm/s H₂O
Operating Voltage Range	18 to 42.5 Vdc
Max Response Time	20 msec
Power Consumption	7.6 watts at 28 Vdc, 70F
Leakage, Internal	1 scc/hr GHe
Leakage, External	1x10^-6 scc/s GHe
Cycle Life	10,000 cycles
Mass	1.39 lbm (0.63 kg) max
Operating Temperature Range	14 to 140 ºF (-10 to 60 ºC)