Laboratory measured Cv values are up to 20% higher than conventional globe valves. The stainless steel body design provides maximum flow opening within a smooth (eggshell) finished casting of extremely low relative roughness. Linear and equal percentage plugs are available for flow control.

Guided by code safety factors, all components operating at process temperatures are designed with minimum wall thickness for lowest mass.

The bonnet extension is constructed of long, thin-wall, precision-machined tubes to limit conductive heat transfer. Laminar Radiation Shielding is applied around the body area. CVI valves are specifically designed for critical LH2 and LHe service where low heat leak is of the utmost importance.

Bubble-Tight Shutoff

The self-aligning tapered plug contains a replaceable KEL-F® seal for positive shutoff. All valves are assembled and tested for “bubble-tight” shutoff at maximum operating pressure prior to shipment.

Installed Orientation

Because of the unique static vapor-seal in the extended bonnet, the valve can be installed and operated in any orientation — even upside down!

Simple In-Line Maintenance

Top entry permits all moving parts to be removed without disturbing the vacuum space.

Ease of Operation and Reliability

All moving and contacting parts have closely-held tolerances for free operation. The sliding barrel is hard-flash chromed to prevent galling. The bonnet O-ring seals and the KEL-F® seal are inexpensive and the only designed replaceable items. Valve operation is remarkably smooth under all conditions.

Because the valve body contours follow that of the V-1060 series and the castings have the same smooth (eggshell) finish, the V-2060 series helium valves have the same higher Cv values achieved in the V-1060 series cryogenic valves.

Lower heat-leak values have been achieved in the helium valve by extending the heat path from the bonnet to the valve body utilizing thin wall, precision manufactured tube to limit the conductive heat transfer. Likewise, the inner portion of the valve has been broken into segments, which eliminate single-path conduction. The vacuum sides of all cold surfaces are electro-polished for high reflectivity in addition to laminar radiation shielding applied around the body area, both of which reduce the radiant heat transfer. For specialized applications these valves can also be heat stationed with LN2/GHe which can reduce heat leak by as much as 50%.

Bubble-Tight Shutoff

The helium-series globe valves have a self-aligning tapered plug in the V-2060/V-2070 series. The V-2080 series is aligned by precision fabrication which assures perfect seating in these valves. All helium valves contain a replaceable Kel-F® seal for positive shutoff. Each valve is assembled and pressure tested for bubble-tight shutoff prior to shipment.

Simple In-Line Maintenance

Top entry permits all moving parts to be removed without disturbing the vacuum space.

Fabrication and Testing

All moving and contacting parts have closely held tolerances for free operation. The barrel is hard flash chromed to prevent galling. The bonnet O-Ring seals, Kel-F® seal and stem extension teflon guide are the only designed replaceable items. Prior to shipment all valves are proof pressure tested, tested for positive bubble tight shutoff, commercially cleaned (oxygen cleaning available) and sealed. Shipping containers are carefully prepared, packed and sealed to assure damage-free shipment.

Performance Data

By definition, C_v for a valve equal to the number of gallons per minute of water (specific gravity of 1.0) which will pass through the valve seat with a pressure drop of one psi. Click here for sizing of valves.