Spacecraft Components

Typical Performance Specifications

• Propellant

  Hydrazine

• Nominal (100%) Flow Rate

  3.3 lb/sec with 605 psia inlet pressure

• Near shut-down Flow Rate

  .033 + 0.025/ -0.02 lbm/sec at LVDT position of -0.2VDC +/-0.5VDC

• Nominal Operating Pressure

  605 psia

• Proof Operating Pressure

  1200 psia

• Burst Operating Pressure

  1900 psia

• Stroke

  ~0.300 inches (near shutdown to 100% flow rate)

• Maximum Power Demand

  < 35 watts steady state (< 170 watts @ stall)

• Cycle Life

  1,000 full-stroke (200 wet, 800 dry)

• Mass

  < 3.2 lb

• Position Indication

  LVDT

• LVDT Feedback Resonse

  within .080 sec of input

• Recovery at 100% flow, 605 psia

  > 79%

• Flow Rate Resolution

  .033 lb/sec change in flow

• Pintle Stroke Resolution

  < .00005''

• Flow Rate Repeatability

  ± 1.75% of full range flow

• Wetted Materials

  Titanium, FEP, Vac melt 304 CRES

• Thermal Capability (Operating)

  +68 to 150 degrees F

• Leakage (Internal/External)

  < 300 scch (with 605 psia GHe at valve inlet)

• Input Command Range (Full Stroke)

  ~-.2 to +6.0 VDC from Valve Drive Electronics

Most of the listed performance parameters reflect the program requirements and not he design limitations of the valve. In general most valves will perform better than listed n the following areas: system pressure, flow rate, pressure drop, internal leakage and response time.