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API 600 Gate Valve

1. Product Overview

API 600 gate valve

A cast steel API 600 gate valve, bolted bonnet, OS&Y, SS304, RF flanged ends.

The API 600 gate valve supplied by Metals Valve is a typical wedge gate valve which uses two inclined seats and a slightly mismatched inclined gate that allows for tight shutoff, even against higher pressures. The inclined seats are designed 5° to 10° from the vertical plane, while the inclined gate can be designed with a close, but not exact angle. When the seat and gate angles are slightly mismatched, either the seat or gate is designed with some free movement to allow the seating surfaces to conform with each other as the hand-wheel or actuator force is applied. API 600 is the standard specification for steel gate valves with flanged or butt-welding ends and bolted bonnet which are designed for heavy duty applications such as petroleum refinery and related applications where corrosion, erosion and other severe service conditions would indicate a need for full port openings, heavy wall sections and large stem diameters.

Design & Manufacture Standards: API 600, API 6D, ASME B16.34, ISO 10434, ISO 14313; Pressure Test: API 598; End Connections: RF/ RTJ-ASME B16.5/ ASME B16.47 Series A & B, BW-ASME B16.25; Face to Face Dimensions: ASME B16.10. Serial Number: APGV18. See the drawing and dimension-weight specification of APGV18.

2. Design Features

Operation

Hand-WheelPneumaticElectric
Handwheel Operated API 600 Gate ValveAPI 600 Gate Valves with a pneumatic actuatorAPI 600 wedge gate valve with an electric actuator
The operation of API 600 wedge gate valves: Handwheel Operated, Pneumatic Actuators, Electric or Hydraulic Actuators.

End Connection

RFRTJFFBW
raised face end connectionRing Type Joint(RTJ) Flanged Endsflat face(FF) flanged endsButt-welding(BW) ends of API 600 wedge gate valves
There are 4 basic types of end connection for API 600 gate valves: RF flanged, FF flanged, RTJ flanged, as well as butt-welding(BW).

Bolted Bonnet

150LB300LB600LB900LB
gasket for bolted bonnet of 150LB API 600 gate valvegasket for bolted bonnet of 300LB API 600 gate valvegasket for bolted bonnet of 600LB API 600 gate valvegasket for bolted bonnet of 900LB API 600 gate valve
Different types of gaskets are adopted to assure tight sealing between the cover flange and body of the bolted bonnet at different pressure ratings. Smooth ellipse composite gaskets are used for Class 150LB API 600 gate valves; Half groove spiral wounded gaskets are used for Class 300LB; Full groove spiral wounded gaskets are used for Class 600LB; Octagonal or oval metallic ring gaskets are used for Class 900LB.

Pressure Seal

pressure sealed bolted bonnet for 1500LB & 2500LB

The pressure sealed bonnet design for 1500LB and 2500LB API 600 gate valves.

 

The pressure-sealed bonnet overcomes the weight disadvantages by letting the fluid pressure tighten the bonnet joint. The bonnet seal therefore becomes tighter as fluid pressure increases. This construction is frequently preferred for Class 1500 & Class 2500 API 600 gate valves that are operated at high pressures and elevated temperatures.

Other Features

(1) Wedge(disc): one-piece flexible wedge or solid wedge. Integral rib face design assures self-aligning of the wedge.
(2) Double-Stem Packing to assure low emission and tight stem sealing.
(3) A Lantern Ring is furnished at back seating for sealant injection or leakage-collection & drain.
(4) Bypass design to relieve the seating load prior to opening the valve at high pressure applications.
(5) OS&Y(Outside Screw & Yoke): the screw for raising or lowering the stem is located outside the valve body(rising stem).
(6) Live Load Packing: Belleville springs are employed to provide constant packing gland stress.
(7) Hard Faced Seating to assure durable wear resistance of the seating surface.

3. Material Selection

Technical Drawing

G.A Drawing of API 600 Gate Valve

The technical drawing of conventional API 600 gate valves.

Zoom-In AZoom-In B
OS&Y drawing Zoom-InAPI Gate Valve's Packing Desing Zoom-In
Zoom-In view of OS&Y structure(A) and packing design(B) of API 600 gate valves.

Materials Selection

ItemPart NameMaterial
1Grease InjectorSS304
2YokeA216 WCB; A217 WC1, WC6, WC9, WC11, C5, C12; A351 CF8, CF8M, CF3, CF3M
3Yoke BoltASTM A193 B7, B16, B7M, B8, B8M; ASTM A320 L7
4Hand Wheel NutASTM A194 8
5Hand WheelDuctile Iron or Carbon Steel
6Stem NutCopper Alloy, ASTM A439 D2
7StemASTM A182 F6, F304(L), F316(L), F321, Alloy 20, 4140, 4340, 17-4PH
8Gland FlangeASTM A216 WCB; ASTM A351 CF8
9Packing GlandASTM A276 T410, T304(L), T316(L), T321, Alloy 20
10Packing BoltsASTM A193 B7, B16, B7M, B8, B8M; ASTM A320 L7
11PackingGraphite or Braided Graphite
12Packing SpacerSS316/ SS304
13Backseat BushingASTM A276 T410, T304(L), T316(L), T321, Alloy 20
14BonnetA216 WCB; A217 WC1, WC6, WC9, WC11, C5, C12; A351 CF8, CF8M, CF3, CF3M
15Bonnet GasketSS316+Graphite, 1038, SS304, F304L, F316L
16Bonnet BoltASTM A193 B7, B16, B7M, B8, B8M; ASTM A320 L7
17BodyA216 WCB; A217 WC1, WC6, WC9, WC11, C5, C12; A351 CF8, CF8M, CF3, CF3M
18Gate/DiscA216 WCB; A217 WC1, WC6, WC9, WC11, C5, C12; A351 CF8, CF8M, CF3, CF3M
19Seat RingASTM A182 F6, F304(L), F316(L), F321, Alloy 20
20Lantern RingASTM A276 T410, T304(L), T316(L), T321, Alloy 20
21PlugSS304

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Wedge Gate Valve

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