- Pressure Seal Gate Valve
Falcon Flow Control Pressure Seal Cast Steel Gate Valve
Compact and robust gate valve with a pressure seal bonnet designed for high-pressure, high-temperature critical service applications.
Full Description
The Falcon Flow Control Pressure Seal Gate Valve is purpose-built for high-pressure, high-temperature service in power generation, petrochemical, and oil & gas processing industries. Unlike conventional bolted bonnet valves, this design features a pressure-energized bonnet seal, which improves tightness as system pressure increases, reducing leakage risk and maintenance needs.
This space-saving and high-integrity design makes it especially ideal for Class 900 to 2500 pressure applications, including steam, feedwater, and hydrocarbon service. The flexible wedge, hardened seating surfaces, and precision-machined components ensure zero-leakage shut-off and long lifecycle even under thermal shock and cyclic service.
Features & Benefits
Pressure Seal Bonnet
Enhanced tightness with increasing pressure; compact & leak-resistant
Flexible Wedge Design
Accommodates thermal expansion and misalignment
Hard-faced Seating
Wear-resistant, erosion-proof, and reliable for high-cycle applications
Compact Design
Smaller envelope vs. bolted bonnet, ideal for tight installations
Low Torque Operation
Efficient operation due to reduced friction seat/stem system
Backseat Feature
Allows stem packing replacement under pressure
Fire-Safe Design
Available with certified fire-safe components
Low Emission Packing
Optional ISO 15848-compliant stem seals
Certifications & Standards
- API 600 (design), API 6D (transmission lines)
- ASME B16.34 / B16.10 / B16.25
- API 598 – Hydrostatic & seat testing
- Fire-safe: API 607 / ISO 10497 (optional)
- NACE MR0175 / ISO 15156 (for sour service)
- ISO 15848 – Fugitive emission (on request)
- PED 2014/68/EU
- MSS-SP 144 / ISO 10434
Application Segments
Superheated steam systems
High-pressure/high-temperature refinery services
Combined cycle and thermal power plants
Feedwater & boiler isolation
Hydrogen & ammonia service (with proper materials)
High-pressure manifolds in process industries
HPHT (High-Pressure High-Temperature) service lines
Product Line
Falcon Cast Series
Pressure Seal Gate Valves
Size Range
NPS (inch)
DN (mm)
2” – 24”
DN 50 – DN 600
Pressure Class
Standard
Rating
ASME
Class 900, 1500, 2500
API
Up to 10,000 psi (on request)
Materials
- Body / Bonnet: ASTM A216 WCB, A217 WC6, WC9, C12A, A351 CF8M
- Disc / Wedge: F6a, SS316, Inconel overlay
- Seat Rings: Stellite or Stainless Steel (welded or renewable)
- Stem: SS410, 17-4PH, or Inconel
- Gasket: Pressure Seal Gasket – SS + Graphite or SS + Inconel
- Packing: Graphite with lantern ring
- Yoke Sleeve: Bronze or Stainless Steel
Standard Connections
- Butt Weld – ASME B16.25
- Flanged RF/RTJ – ASME B16.5 (up to Class 2500)
- Face-to-Face – ASME B16.10
- ISO 5210 Mounting Pad (for actuation)
Design Options
- Flexible or split wedge
- Non-rising or rising stem (optional)
- Gear-operated or motorized actuators
- Extended bonnet for insulated or buried installations
- Bypass lines or drain tappings
- Stellited seat and wedge surfaces
- Locking arrangements for manual valves
- High-temperature materials (e.g., C12A) for severe conditions