Pressure Seal Gate Valve Butt-weld End High-Pressure Class 600-2500
For gate valve with pressure Class 600 / PN100 or higher, Pressure
seal bonnet is suggested for better closure, 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 ensures 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 BW End Pressure Seal Gate Valves:
Pressure seal bonnet
Outside screw and yoke
Metal-to-metal seat, satellite overlay on wedge disc, seat, and
backseat
Standard ISO top mounting for easy assembly of any type of actuator
or bevel gear.
Butt-weld end or flange end
Applicable standards of BW End Pressure Seal Gate Valves:
a) Design & Manufacture: API 600, API 6D, 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, EN 12627, JIS
B2220
d) Test: API 600, API 6D, EN 12266
