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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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ITEM
PART NAME
MATERIAL
1
Body
ASTM A216 GR.WCB
2
Seat Ring
ASTM A105 + Stellite Faced
3
Disc
ASTM A216 GR.WCB+13Cr Faced
4
Stem
ASTM A182 GR.F6
5
Gasket
Soft Iron + Graphite
6
Bonnet
ASTM A216 GR.WCB
7
Bonnet Bolt Nuts
ASTM A194 GR.2H
8
Bonnet Bolts
ASTM A193 GR.B7
9
Backseat Bushing
ASTM A276 Type 410
10
Stem Packing
Braided Graphite & Die Formed Graphite Ring
11
Eye Bolt Pins
Die formed Graphite Ring Carbon Steel
12
Gland Eye Bolts
ASTM A307 GR.B
13
Gland
ASTM A276 Type 410
14
Gland Flange
ASTM A216 GR.WCB
15
Eye Bolt Nuts
ASTM A194 GR.2H
16
Grease Nipple
Carbon Steel
17
Stem Nut
ASTM A439 GR.D-2
18
Retaining Nut
Carbon Steel
19
Hand wheel
Ductile Iron
20
Hand wheel Nut
Carbon Steel
21
Screw
Carbon Steel
22
Yoke
ASTM A216 GR.WCB
23
Yoke Pan Bolt Nuts
ASTM A194 GR.2H
24
Yoke Pan Bolts
ASTM A193 GR.B7
25
Bearing
Steel
API Flanged High Pressure Sealed Gate Valve
Model NO.: FYV
Thread Position of Valve Rod: Inside Gate Valve
Usage: Regulation
Standard: ANSI
Application: Industrial Usage, Water Industrial Usage, Household Usage
Size: 4′′-12′′
Rating: Class600-2500
Ends Con,: Sw,Bw,Rtj
Operation: Handhweel,Electric,Pneumatic
Trademark: FYV
Transport Package: Wooden
Specification: CE, SGS
Origin: Wenzhou, Zhejiang
HS Code: 8481804090
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.