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Cast Steel Valve
Forged Steel Valve
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Recommendation
Cast Steel trunnion mounted Ball Valve
Cast steel Floating Ball Valve
Forged Steed Floating-Ball Valve
Forged Steel trunnion mounted Ball Valve
Cast Steel Gate Valve
Cast Steel Globe Valve
Forged Steel Gate Valve
Forged Steel Globe Valve
Pressure Seal Gate Valve
Pressure Seal Globe Valve
JIS Gate valve
DIN3352 Gate Valve
Cryogenic Gate Valve
Cast Steel Swing Check Valve
Three Offset Butterfly Valve

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Homepage>>>Products>>>Gate Valves
The gate valve is opens by lifting a round or rectangular gate / wedge out of the path of the fluid. The distinct feature of a gate valve is the sealing surfaces between the gate and seats are planar. The gate faces can be wedge shape or parallel. Typical gate valves should not be used for regulating flow, unless they are specifically designed for that purpose. On opening the gate valve, the flow path is enlarged in a highly nonlinear manner with respect to percent of opening. This means that flow rate does not change evenly with stem travel. Also, a partially open gate disk tends to vibrate from the fluid flow. Most of the flow change occurs near shutoff with a relatively high fluid velocity causing disk and seat wear and eventual leakage if used to regulate flow. Typical gate valves are designed to be fully opened or closed. When fully open, the typical gate valve has no obstruction in the flow path, resulting in very low friction loss.
API600 Cast Steel Gate Valve
API6D Cast Steel Gate Valve
API6D Plate Gate Valve
Knife Gate Valve

API600 Cast Steel Gate Valves

Bevel gear operated gate valve

Electrical operated gate valves

Knife gate valves

API602 Forged Steel Gate Valve
API600 Cast Steel Gate Valve
BS1414 Gate Valve
bronze-gate-valve-brass-gate-valves-C95800-C95500-B62-B61

Forged Steel Gate Valves

Stainless steel gate valves

Flanged gate valves

Bronze gate valves

API600 Bellows Gate Valve
JIS Gate valve-10K-20K-SUS304-SUS316
API600 Cryogenic Gate Valve- Extended bonnet

Bellows Gate Valve

JIS Gate valve

Cryogenic Gate Valve

DIN3352 Gate Valve

API Forged Presure-seal Gate Valve-1500LB-2500LB
API Plate Gate Valve
Pressure Seal Gate Valve-HIGH PRESSURE GATE VALVES
 

Forged Steel Presure-seal Gate Valve

Plate Gate Valve

Pressure Seal Gate Valves

 

Main parameter of the Gate valves

ANSI Std. Gate valves
Class 150LB-2500LB SIZE 1/2"~60"
DIN Std. Gate valves
DN50~DN1200, PN16~PN420
JIS Std. Gate valves
DN15~DN800 10K~40K
DN15~DN800, PN16~PN420
Design & Manufacture Std.
API600, API 6D,ASME B16.34,API603 BS1414,DIN3352,BS1984 etc.
Face to Face Std.
ASME B16.10, API 6A, ,DIN3202,EN558, BS2080,MSS SP-81, JIS B2002,NFE29-305,ISO5752 etc.
End Connection Std
ASME B16.5,ASME B16.11,ASME B1.20.1,ASME B16.25, EN1092-1, DIN2501,DIN2543-2550 ,JISB2212-JISB2214,JIS2220 (Connection type: RF,FF,RTJ,BW,SW,NPT,)
Test Standard
API598, API 6D,BS 6755, DIN3230,EN12266 ,JIS B2003
Operated Type
Handwheel,Bevel Gear ,Pneumatic,Electric, Bare stem with ISO5210 top mounting pad
Material
Carbon Steel: A216 WCB,WCC, WC1,ASTM A105
Stainless Steel: A351 F8(F304),CF8M(F316),CF3(F304L),CF3M(F316L),CF8C(F347),F321,F321H,CK20
Alloy Steel:Monel 400, Monel K500, alloy20,904L,CN7M, Inconel, Hastelloy® B&C, Titanium alloy
Duplex Stainless Steel:A351 CN7M(B473), CD4MCu(F50),CK3MCuN(F44),CG8M, A890-1A,4A,5A,6A, A182 F44,F50,F51,F53,F310 Low temperature steel:A352 LCB,LCC,LCA,LC3,A350 LF2,LF3
High temperature steel:A217 WC6,WC9,WC5,WC11,C5,C12,C12A,A182 F22,F11 ,F5,F9,
Bronze, Nickel aluminum bronze(NAB),Gunmetal: B148 C95500,C95800,C95400,C83600, C92200,ASTM B62, B61, B150 C63200 ,
DIN Material:GS-C25/1.0619 1.4408, 1.4308, C22.8
Gate valve catalogue
Gate valves catalogue (5.4Mb)
DIN Gate valves Catalogue (1.4Mb)
Special Gate Valves
Except for common gate valves, we also produce cryogenic gate valves, bellow sealed gate valve, Jacketed gate valves, Through Conduit Gate Valve,Parallel Slide Gate Valve,Knife Gate Valve,High-Temperature Gate Valve,high pressure valves etc.

SEDELON GATE VALVE DESIGN

Gate valve Bonnet Design

Bonnets provide leak proof closure for the valve body. Gate valves may have a screw-in, union, or bolted bonnet. Screw-in bonnet is the simplest, offering a durable, pressure-tight seal. Union bonnet is suitable for applications requiring frequent inspection and cleaning. It also gives the body added strength. Bolted bonnet is used for larger valves and higher pressure applications.

Another type of bonnet construction in a gate valve is pressure seal bonnet. This construction is adopted for valves for high pressure service, typically in excess of 15 MPa (2250 psi). The unique feature about the pressure seal bonnet is that the body bonnet joints seals improve as the internal pressure in the valve increases, compared to other constructions where the increase in internal pressure tends to create leaks in the body-bonnet joint.

Gate valve Disc Design

Solid or Flexible Wedge or parallel disc .

Gate valve Stem Design

Gate valves are characterized as having either a rising or a non-rising stem. Rising stems provide a visual indication of valve position. Non-rising stems are used where vertical space is limited or underground.
The stem is of one-piece wrought material, welding fabricated is not permitted for SEDELON valves. The connection of the stem to the disc is “T” type. The strength of the connecting area is higher than that of the T threaded part of the stem. The strength test of the area conforms to API 591.

Gate valve Seat Design

For carbon steel gate valve, the seat material is usually forged steel. The sealing surface of the seat is overlay welded with hard alloy specified by customers. Renewable threaded-in seat ring is used for gate valves NPS≤10, and welded-on seat is optional and can be used if required. Welded-on seat is used for carbon steel gate valves NPS ≤10. For Stainless steel gate valve, the seat is integral or hard alloy welding integrally to the body. Threaded-in seat ring or welded-on seat is also optional for stainless steel gate valve.


Gate valve Back Seat Design

All SEDELON gate valves have the back seating design. In most cases, the carbon steel gate valve is fitted with a renewable back seat while for stainless steel gate valves, the back seat is machined directly in the bonnet or is machined after welding. When the gate valve is at fully open position, the sealing of the back seat is very reliable. However, according to API 600, the packing shall not be added or changed under line pressure.

Body-Bonnet Gasket Design

Carbon steel or stainless steel + flexible graphite combined gasket is used for Class150 gate valve; stainless steel + flexible graphite spiral wound gasket for Class 300 gate valve; stainless steel + flexible graphite spiral wound gasket for Class 600 gate valve, and ring type joint gasket is optional for Class 600 gate valve; ring type joint gasket is used for Class 900 gate valve; pressurized seal design is used for Class1500 to Class 500 gate valve.

Gate valve Packing Seal Design

Molded flexible graphite is normally used for packing material. PTFE or combined packing material can be also adopted if required. The internal surface of the stuffing box, of which area contacts the packing, is fine finished (Ra 3.2μm). The stem surface, contacting the packing, should be rolled and pressed after being precisely machined, so as to reach to high finish and compactness (Ra 0.8μm) and to ensure the reliable tightness of the stem area.

Gate valve Stem Nut Design

Usually, the stem nut is made of copper alloy or ASTM A439 D2. For large sized gate valves (NPS 10 for Class 150, NPS 8 for Class 300, NPS 6 for Class 600, NPS 5 for Class 900), rolling bearing is fitted underside of the stem nut in order to minimize the open and close torque of the gate valve.


Gate valves Operation type

Hand wheel or gearbox operator are usually applied, if required, chain wheel is available. Top flange dimension according to ISO 5211 is available for valves to be actuated.
Belleville Spring Loaded Packing
If required, Belleville spring loaded packing can be applied to enhance the durability and reliability of the packing seal.

 

Gate Valve Manufacturers,Gate Valve Suppliers,ansi gate valves,knife gate valve,api600 gate valves,BS1414 Gate valve,ASME B16.34, NACE MR0175,gate valves catalog

 

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