Cast Steel Gate Valve
Engineered for bi-directional plant and pipeline on-off isolation under high pressure and elevated temperatures. Features an outside screw and yoke (OS&Y), rising stem, flexible wedge disc with precision ground guide ribs, renewable seat rings with Stellite 6 hardfacing, and live-loaded fugitive emission packing.
Design Codes & Construction Criteria
Complies with API 600 heavy-wall casting requirements, exceeding minimum ASME B16.34 shell thicknesses for extended corrosion allowance and superior pipeline rigidity.
| Engineering Parameter | Applicable Codes, Standards & Design Criteria |
|---|---|
| Design & Manufacturing Standard | API 600 (13th / 14th Edition), ASME B16.34, ISO 10434, BS 1414 |
| Face-to-Face Dimensions | ASME B16.10, ISO 5752, EN 558-1 Series 10 / Series 11 |
| Flanged End Connections | ASME B16.5 (NPS ≤ 24"), ASME B16.47 Series A / Series B (NPS > 24"), EN 1092-1 |
| Butt-Weld (BW) End Prep | ASME B16.25 (custom transition bevels for matching pipe schedules SCH 40/80/160/XXS) |
| Pressure Seal Bonnet (PSB) | Available for Class 900, 1500, and 2500 for high-pressure power and superheated steam lines |
| Low Fugitive Emission Testing | API 624 certified with graphite packing rings; ISO 15848-1 Class BH compliant (< 100 ppm) |
| Fire-Safe Verification | API 607 / ISO 10497 external fire exposure tested and certified |
| Sour Gas Service (H2S) | NACE MR0175 / ISO 15156, NACE MR0103 with max hardness HRC 22 on all wetted parts |
| Hydrostatic Shell & Seat Inspection | 100% factory tested per API 598 (1.5× rating shell test, 1.1× high-pressure seat closure test) |
| Material Test Reports (MTR) | EN 10204 Type 3.1 standard; Type 3.2 available witnessed by DNV, TÜV, or SGS |
Critical Architecture of TSV API 600 Gate Valves
Every component is engineered to eliminate galling, prevent thermal binding, and guarantee bi-directional isolation in severe pipeline and plant services.
Flexible Wedge Design
One-piece flexible wedge with central taper groove compensates for piping stress deflection and high thermal expansion, preventing mechanical wedge binding when the valve cools down.
Hardfaced Stellite 6 Trim
Wedge seating faces and welded-in body seat rings are overlaid with cobalt-chromium Stellite alloy (minimum 1.6 mm thickness), delivering extreme resistance to erosion, wire-drawing, and galling.
Precision Ground Backseat
Conical integral backseat seat machined directly on the bonnet underside isolates the stuffing box when the valve is in the full-open position, ensuring zero fugitive stem leakage.
High-Pressure Seal Bonnet
For ASME Class 900 through 2500, the pressure-seal joint utilizes line fluid pressure to compress the flexible metal gasket against the body retainer ring, tightening the seal as pressure rises.
Heavy-Duty ACME Stem
One-piece forged T-head stem with precision rolled ACME single or double lead threads. Stem-to-wedge connection is tested to withstand maximum actuator stall torque without deformation.
By-Pass & Equalization Prep
Factory equipped with integral boss drillings for MSS SP-45 bypass valves or upstream disc relief holes to alleviate hydrostatic lock and reduce valve opening operating torque.
Standard API Trim Selection Guide
Material pairing for stem, wedge seating faces, and seat rings according to API 600 Table 8 and process media compatibility.
| Trim No. | Nominal Trim Type | Stem Material | Wedge Surface | Seat Ring Surface | Recommended Service |
|---|---|---|---|---|---|
| Trim 1 | 13Cr (F6a) | ASTM A182 F6a | 13Cr (F6a) | 13Cr (F6a) | Non-corrosive oil, gas, water, and general steam up to 425℃ |
| Trim 5 | Full Hardfaced (HF) | ASTM A182 F6a | CoCr-A (Stellite 6) | CoCr-A (Stellite 6) | High pressure, severe erosion, steam, boiler blowdown up to 593℃ |
| Trim 8 | 13Cr + Hardfaced (Universal) | ASTM A182 F6a | 13Cr (F6a) | CoCr-A (Stellite 6) | Standard refinery, petrochemical & steam piping (General Severe Service) |
| Trim 10 | 316 Stainless Steel | ASTM A182 F316 | 18Cr-12Ni-2Mo (316) | 18Cr-12Ni-2Mo (316) | Corrosive fluids, weak organic acids, marine & seawater service |
| Trim 12 | 316 + Hardfaced | ASTM A182 F316 | 18Cr-12Ni-2Mo (316) | CoCr-A (Stellite 6) | Sour hydrocarbons, corrosive steam, high differential pressure |
| Trim 16 | Full Hardfaced 316 | ASTM A182 F316 | CoCr-A (Stellite 6) | CoCr-A (Stellite 6) | Severe sour crude with entrained abrasive catalyst fines |
In-House Machining, Assembly & Testing for API Gate Valves
Every TSV gate valve is produced within our Yongjia facility. We machine heavy bodies, plasma weld Stellite trims, assemble precision gearboxes, and execute 100% shell/seat hydrostatic tests before crating.
Frequently Asked Technical Questions: Gate Valves
Key engineering criteria to ensure correct selection, prevent line binding, and comply with international project specifications.
A solid wedge is completely rigid. When process temperatures fluctuate or piping loads apply bending moments to the valve body, a solid wedge is prone to thermal binding (seizing tight in the seat when cooled down). The TSV flexible wedge has a precision machined taper groove that allows the two seating discs to flex independently, accommodating thermal expansion differences and pipe deflections while maintaining tight bi-directional shut-off.
Bolted Bonnet designs rely on heavy studs to maintain gasket compression, which become extremely bulky, heavy, and susceptible to bolt relaxation at high temperatures above Class 600. The Pressure Seal Bonnet (PSB) design uses internal line pressure to energize a flexible metal/graphite sealing ring against the body wedge. As line pressure rises, the sealing force automatically increases, significantly reducing valve weight and ensuring leak-free performance on Class 900, 1500, and 2500 superheated steam and boiler feedwater headers.
API Trim 8 is the industry universal trim for oil, gas, and refinery service. It pairs an ASTM A182 F6a (13Cr) wedge surface with a Stellite 6 hardfaced body seat ring, preventing seat galling through differential hardness. API Trim 5 features full Stellite 6 hardfacing on BOTH the wedge seating faces and the body seat rings, making it mandatory for severe abrasive slurries, high-velocity throttling transitions, and high-temperature steam blowdown.
Yes. When installing large-bore gate valves (NPS 12" and larger) with horizontal stems, TSV adds reinforced stem guide tracks and heavy wedge support shoes to prevent stem sagging, asymmetric packing wear, and uneven seat contact. Please specify horizontal orientation on your project datasheet so our engineering team can incorporate appropriate internal guides.
Complete Cast Steel Gate Valve Models & Technical Capabilities
Browse TSV's complete portfolio of certified cast steel gate valve models. Engineered to order with customizable trims, metallurgy, pressure ratings, and factory-fitted actuation for mission-critical installations.
API 600 Heavy Bolted Bonnet Cast Steel Flexible Wedge Gate Valve
The primary isolation valve for oil refineries and power utilities. Heavy wall cast body with full Stellite 6 trim (API Trim 5, 8, 12) for high differential shutoff.
Aluminum Bronze Marine & Offshore Cast Gate Valve
ASTM B148 UNS C95800 nickel aluminum bronze body preventing biofouling and chloride galvanic corrosion in offshore firewater and cooling loops.
Electric Motor Actuated Cast Steel Gate Valve
Equipped with ISO 5210 actuator flange and motorized actuator (Rotork, Auma, Limitorque ready) with torque limiters and position feedback.
Extended Stem Cryogenic Cast Steel Gate Valve
Extended bonnet column maintaining packing temperature above freezing for cryogenic LNG terminals and liquid nitrogen plants per BS 6364.
Stainless Steel Threaded NPT Cast Gate Valve
Compact threaded bonnet gate valve with non-rising or rising stem for chemical sampling lines and skid boundary connections.
Bevel Gear Operated Large Bore Gate Valve
Enclosed bevel gearbox reduction ensuring smooth one-man operation under maximum line shut-off pressure differential.
Explore All 4 Gate Valve Sub-Categories
1:1 aligned with TSV factory catalog. Navigate to specialized casting, forged steel, slurry knife gate, or power station pressure-seal configurations.
Casting Gate Valve
API 600 heavy-wall bolted bonnet cast steel (WCB, LCC, WC6) flexible wedge gate for refinery manifolds.
Current Series View Page Top ↑Forged Steel Gate Valve
API 602 compact forged alloy (A105, F316, F11) for severe high-pressure auxiliary vents, drains, and skids.
Class 800 - 2500 View Forged Steel Gate Valve →Knife Gate Valve
MSS SP-81 beveled stainless blade shearing through abrasive slurry, mineral tailings, and pulp lines.
Slurry & Mining View Knife Gate Valve →Self Sealing Gate Valve
Pressure-seal flexible graphite ring tightening under supercritical steam line pressures for power plants.
Superheated Steam View Self Sealing Gate Valve →Configure & Request a Quote for Cast Steel Gate Valves
Submit your line operating conditions or piping schedule. Our senior valve application team will verify wall thickness, trim selection, and provide a binding quotation with general arrangement (GA) drawings within 24 hours.