LoPro™ Low-profile, Single-stage, Bellows-sealed Poppet Valves
Overview
LoPro™ single-stage bellows vacuum isolation valves have a small footprint that fits easily into existing, and new, vacuum systems. A formed stainless-steel bellows prevents outgassing, virtual leaks, and particle entrapment between bellows convolutions that extends the valves life cycle over a conventional O-ring shaft sealed valve. The bellows' stroke length is optimized to assure a long cycle life while maintaining high conductance.
- NW25 - NW50
- HV pump and line isolation applications
- 1,000,000 cycle rating (clean environments)
Products
Configuration Options
Please see the LPV1 datasheet for product options.
Specifications
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TypeLow-profile, Single-stage, Bellows-sealed Poppet Valve
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Vacuum RangeAtmosphere to 1.0 x 10-9 Torr
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Port SizeNW25, NW40, NW50
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Helium Leak Rate1.0 x 10-9 std cc/sec
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Cylinder Volume1.2 - 6.4 in3, depending on configuration
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Cylinder Air Pressure90 psig ± 30 psig
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Limit Switch Rating5A - 250 VAC
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Single Pole, Single Throw5A - 30 VDC
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Blow-By Pressure80 - 45 psi, depending on configuration
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Actuation Time0.12 - 0.45 sec, depending on configuration
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Maximum Internal Spring Closing Pressure38-60 psia, depending on configuration
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Maximum Bakeout Temperature150°C
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Typical Life1,000,000 cycles
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Weight1.6 - 6.4 pounds, depending on configuration
Features
TIG Fusion-welded Bead-blasted Body
Another standard feature is a TIG fusion-welded, bead-blasted body made of high grade, corrosion resistant, 304 stainless steel for significantly fewer entrapment areas, resulting in less contaminant build-up. In the event of power or air loss, the pneumatic LoPro Valve will automatically spring to close. Actuation can be pneumatic or manual.
LoPro™ Valve Options
The LoPro Valve is available in both angle and inline versions. Port sizes include outside diameters of 1, 1½, and 2 inches and standard port interfaces include KF flanges, CF flanges, and weld stubs. For leak-tight operation, elastomer seals are available in Viton® for typical vacuum operating conditions, in Kalrez® or Chemraz® for higher temperature conditions and increased chemical resistance, and in Buna-N or Silicone.
How to Rebuild an Isolation Valve
Learn how to replace the internal assembly on an MKS Isolation valve. We will be replacing the internals in the MKS valve LPV1-40-AK-CNVS. The process is similar for most MKS isolation valves.
Resources
Literature
- LoPro™ Compact Vacuum Valves (218.8 kB, PDF)
Manuals
- LoPro™ Single Stage Vacuum Valve Manual (461.3 kB, PDF)
Ultra-High Velocity 