Swing Type · Bolted Cover · Non-Return · BS 1868
ANSI Swing Check Valves for Reliable Backflow Prevention in Critical Pipeline Systems
150LB~2500LB, sizes 2″ to 30″ (DN50~750mm), available in WCB, CF8, CF8M, WC6, LCB with standard renewable seat, bolted cover, and flanged or butt-welding ends — NACE MR-01-75 compliant.
Overview
ANSI swing check valve is also called one-way valve or non-return valve, which is used to prevent of mediums back flow in the pipeline. The disc of the check valve is action depending on the mediums itself flow pressure, so the check valve is belonging to automatic valve types. Because the swing check valve is only allowed the mediums to flow in one direction, we should note the arrowhead on the check valve when mount it in horizontal position. Swing check valves are widely used in series of industries, especially in oil & gas filed, power plant, etc. Flowspec Luokai can manufacture the ANSI swing check valve in accordance with ASME B16.34 and BS 1868. Welcome to contact us for detailed information and best quotes if you have any questions or inquiries.
1. Features
- Standard swing type disc
- Standard renewable seat
- BC, bolted cover
- Non-penetrate disc shaft
- Horizontal or vertical service
- Flanged or butt-welding ends
2. Technical Specifications
- Class: 150LB~2500LB
- Size: 2″ ~ 30″ (DN50~750mm)
- Materials: steel A216 WCB, stainless steel 304 (A351 CF8), stainless steel 316 (A351 CF8M), CrMo alloy steel A217, low temperature A352
- Applicable medium: water, sea water, oil, gas, corrosive liquids
- Applicable temperature: -29℃~+425℃ (higher temperature is available upon request)
- Special: NACE MR-01-75
3. Standards
- Design & manufacturing: ASME B16.34 / BS 1868
- Face to face: ASME B16.10
- Flanged ends: ASME B16.5 / B16.47
- Inspection & testing: API598
- Special request: NACE MR-01-75
4. Applications
- Petroleum
- Chemical industry
- Pharmacy
- Chemical fertilizer
- Power plant
- Textile
- Printing & dyeing
- Oil & gas


Materials of Parts
| No | Part Name | Carbon Steel | 1¼Cr-½Mo | Carbon Steel |
|---|---|---|---|---|
| 1 | Body | A216-WCB | A217-WC6 | A352-LCB |
| 2 | Bonnet Cap | A216-WCB | A217-WC6 | A352-LCB |
| 3 | Disc | A216-WCB+Cr13 | A217-WC6+HF | A352-LCB+CR13 |
| 4 | Hinge | A216-WCB | A217-WC6 | A352-LCB |
| 5 | Support | A216-WCB | A217-WC6 | A352-LCB |
| 6 | Seat Ring | A105+HF | A182-F11+HF | A350-LF2+HF |
| 7 | Hinge Pin | A276-420 | A276-304 | A276-420 |
| 8 | Disc Washer | Carbon Steel | A276-304 | Carbon Steel |
| 9 | Disc Nut | Carbon Steel | A194-7 | Carbon Steel |
| 10 | Disc Nut Pin | Carbon Steel | A276-420 | Carbon Steel |
| 11 | Bonnet Gasket | Steel Ring | 304SS Ring | Steel Ring |
| 12 | Bonnet Stud | A193-B7 | A193-B16 | A320-L7 |
| 13 | Bonnet Stud Nut | A194-2H | A194-7 | A194-4 |
| 14 | Eyebolt | Carbon Steel | ||

Dimensions — ANSI Class 1500LB & 2500LB
| NPS | 2/50 | 2.5/65 | 3/80 | 4/100 | 6/150 | 8/200 | 10/250 | 12/300 | 14/350 | 16/400 | |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 1500LB | L/L1 RF/BW | 368 | 419 | 470 | 546 | 705 | 832 | 991 | 1130 | 1257 | 1384 |
| L2 RTJ | 371 | 422 | 473 | 549 | 711 | 841 | – | – | – | – | |
| H OPEN | 350 | 380 | 440 | 505 | 630 | 740 | 830 | 950 | 1060 | 1150 | |
| 2500LB | L/L1 RF/BW | 451 | 508 | 578 | 673 | 914 | 1022 | 1270 | 1422 | – | – |
| L2 RTJ | 454 | 511 | 581 | 676 | 917 | 1025 | – | – | – | – | |
| H OPEN | 410 | 460 | 520 | 580 | 700 | 830 | 940 | 1060 | – | – | |

Why Choose Flowspec Luokai
45+ Years Experience
Founded in 1978, manufacturing industrial valves for over four decades with proven reliability worldwide.
Global Certifications
ISO 9001, CE/PED, WRAS, FM, UL, API approved — compliant with international quality and safety standards.
OEM Custom Solutions
Flexible design and manufacturing per your specifications — material, size, pressure, actuation tailored to project needs.
Worldwide Delivery
Exported to 5 continents — North & South America, Europe, Middle East, Southeast Asia, and Africa.
Our Service Promise
Strict Quality Control
Every valve tested to API 598, EN 12266 before shipment
Timely Global Delivery
Reliable logistics to 5 continents with secure packaging
OEM & Custom Design
Tailored material, size, pressure and actuation to your specs
Dedicated After-Sales
Technical support and service throughout product lifecycle


