ANSI Flat Gate Valve
Product Overview
The ANSI Flat Gate Valve is a full-bore isolation valve designed in accordance with ANSI and API standards. It features a parallel flat gate structure that provides reliable shut-off and smooth flow passage. When fully open, the valve offers an unobstructed straight-through bore, ensuring minimal pressure drop and allowing pipeline pigging without restrictions. This valve is widely used in oil, gas, and industrial pipeline systems where stable sealing performance and low flow resistance are required.
Design Characteristics
The flat gate design eliminates the wedging effect commonly found in traditional gate valves. Sealing is achieved through a floating gate and self-energizing seats that respond to line pressure. This structure allows the valve to maintain tight shut-off in both upstream and downstream directions while reducing operating torque and wear.
Main design features include:
Full bore, straight-through flow path
Parallel flat gate without wedge action
Floating seats with pressure-assisted sealing
Bidirectional sealing capability
Optional double block and bleed (DBB) design
Standards & Specifications
Design Standard: API 6D / ASME B16.34
Face-to-Face: ASME B16.10
End Connections: ASME B16.5 / ASME B16.47 Flanged, Butt Weld available
Pressure Rating: ANSI Class 150 / 300 / 600 / 900
Size Range: 2” – 48”
Leakage Class: API 598 / ISO 5208 Rate A
Materials of Construction
Body: Carbon Steel (WCB), Low-Temperature Carbon Steel (LCB/LCC), Stainless Steel
Gate: Carbon Steel or Stainless Steel, with optional hardfacing
Seats: Stainless Steel, soft or metal-to-metal sealing options
Stem: Stainless Steel, anti-blowout design
Material selection can be customized according to service media, temperature, and pressure conditions.
Key Advantages
Minimal pressure loss due to full bore design
Suitable for piggable pipeline systems
Reliable sealing under high-pressure conditions
Reduced wear and long service life
Easy maintenance with replaceable seats
Typical Applications
ANSI Flat Gate Valves are commonly applied in:
Crude oil and natural gas transmission pipelines
Refining and petrochemical facilities
Gas processing and storage systems
LNG and low-temperature services
Industrial utility pipelines
Operation & Actuation
Available operating methods include:
Manual handwheel
Bevel gear or gearbox
Electric actuator
Pneumatic actuator
Inspection & Testing
Each ANSI Flat Gate Valve is manufactured under a strict quality control system and tested according to API standards to ensure sealing integrity, operational reliability, and safety before shipment.
