Product Overview
Direct-Acting 2-Way Cryogenic Solenoid Valve, Stainless Steel, -454°F Rated, 115V AC
Condition
Unused NOS. Evaluation: Visual inspection only. Function testing not performed. Stainless body with VALCOR markings, zinc-plated solenoid housing, and compression fittings show no wear or damage. Bare lead wires intact. Model number 91C89C-7C confirmed on label. Sourced from a government research facility.
Carefully packed and shipped same or next business day from our Idaho warehouse. Honest equipment and straightforward service.
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Product Overview
Valcor Scientific 91C89C-7C is a direct-acting 2-way cryogenic solenoid valve from the SV91 series, engineered for precise on/off control of cryogenic fluids at temperatures down to -454°F (-270°C). The all-welded stainless steel body eliminates external leak paths across extreme thermal expansion and contraction cycles. At the heart of the design is Valcor's proprietary Floating Seal - an optically flat gate-style disc that floats against an optically flat seat, producing a self-wiping action on every cycle. This maintains a bubble-tight seal even when micro-particulates are present in the fluid path. The direct-acting mechanism requires no minimum differential pressure to actuate, which significantly reduces the risk of freeze-up or mechanical lock common in pilot-operated valves at cryogenic temperatures. Rated to 15 PSIG for this configuration. Operates at 115V AC / 60 Hz, 21 watts continuous duty.
Key Features
- Direct-acting 2-way solenoid operation - no minimum differential pressure required
- Cryogenic temperature rating: down to -454°F (-270°C)
- Pressure rating: 15 PSIG (this 91C89C-7C configuration)
- Electrical: 115V AC / 60 Hz, 21 watts continuous duty
- All-welded stainless steel body - no external leak paths
- Proprietary Floating Seal design: optically flat gate disc on optically flat seat
- Self-wiping seal action handles micro-particulates without compromising shut-off
- Straight-through flow path: minimum pressure loss, minimum turbulence
- Bare lead wires; zinc-plated solenoid housing; compression fittings on lateral ports
Applications
- Cryogenic system engineers integrating inlet shut-off control for liquid nitrogen, liquid oxygen, liquid argon, or liquid CO2 transfer lines where freeze-up of a pilot-operated valve would be a failure risk
- R&D lab technicians plumbing LN2 or liquid helium feed lines into environmental test chambers for spacecraft component qualification or superconducting system testing
- Analytical instrument builders incorporating precise cryogenic flow control into gas chromatography systems or low-temperature sample preparation rigs
- Maintenance technicians replacing failed cryogenic solenoid valves in biologic flash freezers or dewar transfer lines where downtime threatens stored materials
- Industrial facility engineers controlling cryogenic fluid flow on calibration test stands where bubble-tight shut-off and particulate tolerance are both required
Frequently Asked Questions
What cryogenic fluids is this valve compatible with?
The SV91 series is designed for liquid nitrogen (LN2), liquid oxygen (LOX), liquid argon (LAR), liquid carbon dioxide (LCO2), and liquid helium (LHe). For LOX service, verify that the valve and system have been cleaned to oxygen-service standards before installation.
What is the port size and connection type?
Port size and connection type are not confirmed for this specific 91C89C-7C unit. The SV91 series accommodates port sizes from 1/8" to 3/4" NPT or socket weld. Inspect the unit directly to confirm the connection before plumbing.
Is this valve normally closed or normally open?
Not confirmed for this specific unit. The SV91 series is available in both normally closed and normally open configurations. Verify the configuration directly before installation if your application requires a specific failsafe state.
Does this valve require a minimum inlet pressure to operate?
No. The direct-acting design actuates independently of system differential pressure, which is one of its primary advantages over pilot-operated valves in cryogenic service.
What is the electrical connection?
Two bare lead wires exit the top of the solenoid housing. Electrical rating is 115V AC / 60 Hz, 21 watts continuous duty. No plug or connector is included.
Valcor built the SV91 for the environments where a valve failure is not just inconvenient - it is a safety event. This one sat unused in a government research facility, and now it is ready to do the job it was made for. The fluid path is yours to open.
