文章 How It Works: Gate Valves
Stop, allow, or throttle the flow of process fluid with very low friction loss.
FL
API 6A slab-style gate valve
The FL gate valve is the standard product offering for 5,000-psi [34.5-MPa] working pressure. It has served the industry with distinction for many years across a range of application types worldwide and is well tested, both in assembly and component qualification testing. This gate valve also offers exceptional service life with minimal maintenance and provides a low life cycle cost compared to other 5,000-psi valve designs.
Many of the features of the FL valve design are common to our Type F gate valve, which was introduced to the market in 1958: forged construction, metal-to-metal sealing, a slab gate, and design simplicity. In other areas such as seat seals and stem seals, the FL valve design takes advantage of our latest technology in materials and seal design.
Advantages
- Metal-to-metal sealing for gas-tight sealing without sealant
- Reliability through simplicity of design—one-piece floating seats and a floating slab gate provide reliable performance and minimize sealing interfaces
- Symmetrical bidirectional sealing to prevent trapping of pressure inside the valve cavity
- Spring-loaded and pressure-energized stem seal that requires no longitudinal preload or precise spaceout is required
- Single-pressure, energized PEEK lip seal in the seat-to-body interface
- The lip seal in the FL valve performs several functions
- Enhanced sealing integrity at very low differential pressures where low bearing stresses tend to limit the effectiveness of the metal-to-metal seal.
- Qualification to API Spec 6A, Annex F (PR-2) and Annex I (Class II).
| Nominal Bore Size, in |
Working Pressures, psi [MPa] | ||||||
| 2,000 [13.8] |
3,000 [20.7] |
5,000 [34.5] |
10,000 [69.0] |
15,000 [103.5] |
20,000 [138.0] |
30,000 [206.8] |
|
| 1-13/16 | - | - | - | FLS valve | FLS valve | FLS valve | FLS valve |
| 2-1/16 | FL and FLS valve | FL and FLS valve | FL and FLS valve | FLS valve | FLS valve | FLS valve | - |
| 2-9/16 | FL and FLS valve | FL and FLS valve | FL and FLS valve | FLS valve | FLS valve | FLS valve | FLS valve |
| 3-1/16 | - | - | - | FLS valve | FLS valve | FLS valve | - |
| 3-1/8 | FL and FLS valve | FL and FLS valve | FL and FLS valve | - | - | - | - |
| 4-1/16 | - | - | - | FLS valve | FLS valve |
FLS valve | - |
| 4-1/8 | FL and FLS valve | FL and FLS valve | FL and FLS valve | - | - | - | - |
| 5-1/8 | FLS valve | FLS valve | FLS valve | FLS valve | FLS valve | - | - |
| 6-3/8 | FLS valve | FLS valve | FLS valve | FLS valve | FLS valve | - | - |
| 7-1/16 | - | - | FLS valve | FLS valve | FLS valve | - | - |
| 9 | - | - | FLS valve | FLS valve | FLS valve | - | - |
| 11 | - | - | FLS valve | - | - | - | - |
All specifications are subject to change without notice.
For FL valves and FLS™ extreme service API 6A slab-style gate valves, this chart represents typical valves for
- API material classes AA, BB, CC, DD, EE, FF, and HH (except FL valve)
- temperature ratings K, L, P, S, T, U, and V
- product specification levels 1, 2, 3, 3G, and 4.
Contact us for other designs.
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