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Through Conduit Gate Valve

1. Product Overview

Through Conduit Gate Valve

A typical through conduit gate valve, slab type, WCB body, bevel gear operated.

 

The through conduit gate valve is a typical parallel gate valve. Metals Valve supplies through conduit gate valves in two series: slab gate and expanding gate. The closure member(gate/disc) of a through conduit slab gate valve is a slab of metal with a porthole at the bottom. It is provided with floating seats that are spring energized and forced against the disc by fluid pressure. When the valve is fully open, the porthole in the disc engages the valve flow passage port. When the valve is fully closed, the upper solid part of the slab blocks up the valve flow like a blind flange. The through conduit expanding gate valve is developed on the basis of slab gate valve. Instead of one “slab”, the disc consists of two halves with a wedge-shaped interface. Both the female and male gates are provided with complementary opposed inner faces, each formed with two angular-related surface portions diverging transversely. The two halves(gates) are interlinked so that they wedge apart when being moved into the fully open or closed positions, but relax in the intermediate position during the disc travelling stroke. The wedge mechanism ensures tight seal on both upstream and downstream seating surfaces even at low pressure levels. Through conduit gate valves are widely used in oil & gas, petrochemical, power plant and mining industries.

2. Design Features

design features of through conduit gate valve

Illustration of design features of through conduit gate valves.

Design Standards: API 6D; ASME B16.5 & ASME B16.47; ASME B31.4, ASME B31.8. End Connections:RF, RTJ, BW. Rising stem, full port, double block & bleed(DBB), bidirectional seating. Operation: Handwheel, Gear, Actuators.

(1) The ISO 5210 mounting pad are provided to facilitate convenient actuator installation.
(2) Venting valve installed to avoid over pressure inside the body-bonnet cavity.
(3) Emergency sealant injection fitting to prevent leakage in case of seating seal’s failure.
(4) Drain plug to release the residue within body cavity.
(5) Spring-energized seats with double O-rings to ensure efficient sealing even at low pressure.
(6) Special HVOF process for the gate: Electric Nickel Plate(ENP), Tungsten Carbide Overlay(TC), Stellite No.6 overlay.
(7) Emergency sealant injection fitting to ensure stem sealing.

3. Technical Drawing & Material Selection

Technical Drawing of Slab Gate

G.A drawing of throught conduit slab gate valve.

The technical drawing of throught conduit slab gate valve.

Detail View A-ADetail View B-B
Detail view A-ADetail view B-B
Detial View A-A and Detail View B-B respectively depict the emergency sealcant injection fitting of the stem and seating structure of through conduit slab gate valve.

Material Selection for Slab Gate

No.PartStandardLow Temp.
1BodyASTM A216-WCBASTM A352-LCB
2BonnetASTM A216-WCBASTM A352-LCB
3GateASTM A105/ENPASTM A350-LF2/ENP
4YokeASTM A216-WCBASTM A352-LCB
5Stem NutASTM A439 D-2ASTM A439 D-2
6Gland FlangeASTM A216-WCBASTM A352-LCB
7Seat RingASTM A105/ENPASTM A350-LF2/ENP
8StemASTM A182-F6aASTM A182-F316
9Back SeatASTM A276-420ASTM A182-F316
10GlandASTM A276-420ASTM A182-F316
11Gasket316SS+Graphite316SS+Graphite
12PackingGraphiteGraphite
13Lantern RingASTM A276-420ASTM A182-F316
14StudASTM A193-B7MASTM A320-L7M
15NutASTM A194-2HMASTM A194-7M
16Stem EnclosureCarbon SteelCarbon Steel
17O-RingNBRNBR
18SpringInconel X-750Inconel X-750
19Seat InsertPTFEPTFE
20Seat InjectionAssemblyAssembly
21PlugCarbon SteelS.S.
22Stem InjectionAssemblyAssembly
23ScrewCarbon SteelCarbon Steel
24Yoke EnclosureCarbon SteelCarbon Steel
25Class CoverPlexiglassPlexiglass
26Indicate BarASTM A276-420S.S.
27NutCarbon SteelCarbon Steel
28Indicate PlateASTM A276-420S.S.
29Split PinCarbon SteelCarbon Steel
30Retaining NutCarbon SteelCarbon Steel
31HandwheelDuctile IronDuctile Iron
32Handwheel NutCarbon SteelCarbon Steel
33Retaining NutCarbon SteelCarbon Steel
34Grease FittingAssemblyAssembly

Technical Drawing of Expanding Gate

G.A drawing of throught conduit double expanding gate valve.

The technical drawing of throught conduit double expanding gate valve.

Material Selection for Expanding Gate

No.PartStandardLow Temp.
1BodyASTM A216-WCBASTM A352-LCB
2BonnetASTM A216-WCBASTM A352-LCB
3Gate1ASTM WCB-CR13ASTM LCB+316
4Gate2ASTM WCB-CR13ASTM LCB+316
5Stem NutASTM A439 D-2ASTM A439 D-2
6Gland FlangeASTM A216-WCBASTM A352-LCB
7Seat RingASTM A105+STLASTM F316+STL
8StemASTM A182-F6aASTM A182-F316
9Back SeatASTM A276-420ASTM A182-F316
10GlandASTM A276-420ASTM A182-F316
11Gasket316SS+Graphite316SS+Graphite
12PackingGraphiteGraphite
13Lantern RingASTM A276-420ASTM A182-F316
14StudASTM A193-B7ASTM A320-L7M
15NutASTM A194-2HASTM A194-7M
16Stem EnclosureCarbon SteelCarbon Steel
17PlugCarbon SteelS.S.
18Stem InjectionAssemblyAssembly
19ScrewCarbon SteelCarbon Steel
20Indicate BarASTM A276-420S.S.
21NutCarbon SteelCarbon Steel
22Indicate PlateASTM A276-420S.S.
23HandwheelDuctile IronDuctile Iron
24Handwheel NutCarbon SteelCarbon Steel
25Retaining NutCarbon SteelCarbon Steel
26Grease FittingAssemblyAssembly
27Glass CoverPlexiglassPlexiglass
28Eye BoltASTM A193-B7ASTM A320-L7M
29NutASTM A194-2HASTM A194-7M
30PinCarbon SteelCarbon Steel
31Split PinCarbon SteelCarbon Steel

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Parallel Gate Valve

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