SV91 Cryogenic Valve

Introduction:

Valcor Scientific has provided cryogenic solenoid valves for more than 40 years. The SV91 is a large orifice, gate valve designed for the stringent requirements of high-flow liquid Nitrogen (LN₂) applications.

Description:

The SV91 is designed as a 2-way, normally-closed solenoid operated valve with a low mass stainless steel body, heli-arc welded construction to provide a hermetic external seal and structural soundness. No elastomers are used.

As little as 1 psi differential pressure is all that is required to effectively seal the Polyimide disc on the seat.

Standard SV91 series valves are uni-directional flow. Bi-directional and normally open designs are available in the SV91 series.

Applications:

Cryogenic valves typically deliver liquid cryogens from a dewar to a closed chamber. Often, large orifice valves are used to transfer replenishment volumes of LN₂from larger to smaller vessels. Typical LN₂ applications for the SV91 are:

	Inlet valve to cold chambers
	Shutoff valves for LN₂ dewars
	Hi-volume LN₂ transfer
	LN₂ dewar bleed off valve

Due to the design features of the SV91, non-cryogenic applications involving straight-through flow, such as a light gate for lasers or photo-electric light devices, are appropriate.

SV91b.jpg (46011 bytes)

Specifications:

	Size: 4-1/4" x 2-13/16" x 1-1/2"
	Weight: 19 oz.
	Port Connection: 3/8" NPT female
	Wetted Materials: 304 and 430F stainless steel & Polyimide
	Coil Construction: UL Class "H", 10" leads, 18AWG
	Power: 19 watts (24V DC); 21 watts (115V AC)
	Operating Pressure: to 100 psi
	Fluid Temperature: -420°F to +140°F
	Mounting bracket: On 1" slotted centers

Features:

	Straight-through line-of-sight flow provides for minimum pressure loss, minimum turbulence and maximum flow.
	Floating seal gate design provides self-wiping action across the optically flat seat area.
	Robust construction featuring all welded stainless steel pressure boundary accommodating high pressure or vacuum service.
	Direct acting plunger design requires no minimum operating pressure.
	No elastomeric seals.
	Mountable in any position.
	Low mass body provides for minimum heat transfer.

SV95 Cryogenic Valve

Introduction:

With the SV95, Valcor Scientific introduces its third generation line of cryogenic solenoid valves and accessories. The SV95 cryogenic valves accept the challenge of critical flow control needs for liquid nitrogen (LN₂) and liquid carbon dioxide (LCO₂) service. Applications cover a broad spectrum of industries including: analytic chemistry, food processing, bio-medical, micro-electronic and metal treatment.

The SV95 Series offers distinct and unique advantages when used in harsh cryogenic fluid control applications. The SV95 Series has been designed to be quieter, last longer, and to operate more reliably than conventional solenoid valves employed in cryogenic service.

Description:

The SV95 is designed as a 2-way, normally-closed solenoid operated valve with a low mass forged brass body, self-energized Teflon external body seals and stainless steel trim. Especially noteworthy in this design is Valcor's proprietary constant-load Teflon or PFA seal disc that insures bubble-tight shutoff. Designed for fluid temperature down to -345°F, the SV95 Series is suitable for a wide range of low temperature liquids and can also be adapted to your gas control needs.

Because cryogenic applications are both demanding and unforgiving, the SV95 Series was designed to tolerate the non-lubricating aspects of LN₂ and LCO₂, yet survive repeated, severe on/off cycling.

The Valcor Scientific guided plunger design not only enhances quiet operation and longer life, but also overall valve cycling response for crisp, repeatable temperature set points.

Because valve characteristics are affected by application conditions, including: fluid and environmental temperatures, inlet and outlet pressures, and electrical considerations, we encourage you to contact FPCC with your specific application requirements.

Features:

	Proprietary seat/seal design for cryogenic fluids down to -345°F and operating pressure to 1000 psig
	Direct-acting seal: no minimum operating pressure
	Noticeably quieter than other cryogenic valves
	Bubble-tight shutoff
	Robust construction, with a small footprint
	Compact low-mass design
	Mountable in any position as a stand-alone or in manifold configurations
	Wide selection of port configurations, orifice sizes and electrical options

SV95b.jpg (100837 bytes)

Specifications:

	Size: 3" (AC) or 2-3/4" (DC) x 1-5/8" x 1-1/2"
	Weight: 14.8 oz.
	Port Connection: 1/8" or 1/4" NPT female
	Wetted Materials: 304 and 430F stainless steel, Brass, Teflon and/or PFA
	Coil Construction: UL Class "B" or "H" molded
	Power: 8.5, 10 or 15 watts
	Operating Pressure: up to 1000 psi
	Fluid Temperature: -345° to +165°F

Applications:

Cryogenic valves are most often employed to deliver liquid coolant directly into a closed chamber. Chamber sizes can vary from small 10cc quartz vessels for cryo-focusing in gas chromatography, to large cargo trailers employed in food transportation. The SV95 is well suited to the critical control needs of LN₂ and LCO₂ service in the analytic chemistry, food processing and bio-medical industries.

Other common uses for the SV95 to deliver LN₂ or LCO₂ coolant include:

	Test chambers for micro-electronics fabrication
	Backup systems for biologic freezers
	Environmental chambers
	Gas chromatography ovens
	Freezing human tissue for preservation
	Metal treatment

Don't know which valve to use? Download the Cryogenic Valve Application Data Sheet. (2 pgs./14KB)

Teflon® and Tefzel® are registered trademarks of Dupont. Viton® and Kalrez® are registered trademarks of Dupont Dow Elastomers.

This page last updated: Wednesday, January 28, 2004
Information in this document is subject to change without notice.
Other products and companies referred to herein are trademarks or registered trademarks of their respective companies or mark holders.