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美國ALSO艾索閘閥（Gate Valve）

Pressure Seal Gate Valve -> Flanged Pressure Seal Gate Valve

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 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 Flanged Pressure Seal Gate Valve

Outside screw and yoke
Metal-to-metal seat, stellite 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 Flanged 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

Sizes: 4" - 32" or DN100 - DN800
Pressure Rating: Class 600 - Class 2500 or PN 100 - PN 420        
Valve Materials: WCB, LCB, WC6, WC9, C12, C5, CF8, CF8M, Duplex Stainless Steels, etc. 
Operated by: Handwheel, Gear, Pneumatic, Hydraulic and Electric actuator

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