Pressure Seal Swing Check Valve Cast Steel Class 900-2500 High
Pressure
Pressure seal bonnet is suggested for better closure in
high-pressure condition, while bolted bonnet is still available for
customer's option.
The pressure seal design incorporates a metal-to-metal seal that
becomes tighter as the pressure increases. The initial preload
deforms the taper on the soft iron gasket to mate with the taper on
the bonnet. The thin knife-edge on the gasket is wedged tightly
between the body and the bonnet. The shallow angle insures that the
gasket is sealed tightly with only a small upward force on the
bonnet. Once the initial seal is created, the body/bonnet joint
will remain leak free regardless of thermal or pressure conditions
in the valve. After the joint has been assembled, there is no
further need to adjust bonnet cap screws.
Features of Pressure Seal Swing Check Valves:
Swing Disc Design
Pressure Seal Cover
Internal Hinge Pin Design Standard
Through-body Hinge Pin Design Available
Flanged or Butt-welding Ends
Extra Lever, Counter Weight, and Damper Available
Applicable Standards of Pressure Seal Swing Check Valves:
a) Design&Manufacture:API 6D, BS 1868, ASME B16.34
b) Face to Face: API 6D, ASME B16.10, EN 558
c) Connection End: ASME B16.5, ASME B16.25, EN 1092, JIS B2220
d) Test and Inspection: API 6D, EN 12266, API 598, BS 6755
