Standard Products - Valves

PHPK cryogenic globe valves are available from 1/2" OD to 12" NPS. Valves are available as manual, remote on/off, remote flow control, and check valves. Valves are totally interchangeable between valve models and flow characteristics without replacing the valve body. Castings are lost wax investment casts, ASTM A-743, grade CF3 (304L) stainless steel, 100% radiograph and zyglo inspected. Valve component materials of construction are 304L or 300-series stainless steel. Bonnets are bronze alloys.

Valve bonnets have permanently cast or marked flow arrows when vacuum jacketed. All butt weld connections will be "true butt weld" without closed-end cavities (such as socket welds, which can not be easily cleaned for oxygen service). Weld connection between body extension tube and valve body casting are a butt weld connection. Seal disk material is Neoflon® PCTFE M-400H (formerly Kel-F). Valve barrel and bonnet bolts are plated with a PHPK-specified, patented nickel/Teflon plating, which has been tested and approved for oxygen service. This plating, unlike chrome, does not chip or flake and provides a homogenous surface to prevent galling. The valve design will provide a close-tolerance fit (approximately 0.003") between the barrel and the body extension tube, allowing operation in any orientation, even upside down, while ensuring bonnet (Viton®, fluorocarbon rubber, O-ring) seals remain warm when the valve is in cryogenic service. Stem packing utilizes Viton® O-rings on the static and dynamic areas of the sealing surfaces. Bonnets sealed with a single Viton® O-ring. Valves have self-locking seat seals, which do not require staking or welding for assembly or maintenance. All vacuum-jacketed valves are serviceable without breaking vacuums. Stem packing in manual valves is replaceable without removing the valves from service.