China API Flanged High Pressure Sealed 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

ITEMPART NAMEMATERIAL1BodyASTM A216 GR.WCB2Seat RingASTM A105 + Stellite Faced3DiscASTM A216 GR.WCB+13Cr Faced4StemASTM A182 GR.F65GasketSoft Iron + Graphite6BonnetASTM A216 GR.WCB7Bonnet Bolt NutsASTM A194 GR.2H8Bonnet BoltsASTM A193 GR.B79Backseat BushingASTM A276 Type 41010Stem PackingBraided Graphite & Die Formed Graphite Ring11Eye Bolt PinsDie formed Graphite Ring Carbon Steel12Gland Eye BoltsASTM A307 GR.B13GlandASTM A276 Type 41014Gland FlangeASTM A216 GR.WCB15Eye Bolt NutsASTM A194 GR.2H16Grease NippleCarbon Steel17Stem NutASTM A439 GR.D-218Retaining NutCarbon Steel19Hand wheelDuctile Iron20Hand wheel NutCarbon Steel21ScrewCarbon Steel22YokeASTM A216 GR.WCB23Yoke Pan Bolt NutsASTM A194 GR.2H24Yoke Pan BoltsASTM A193 GR.B725BearingSteel