ANSI Pressure Seal Bonnet Check Valve Descriptions
ANSI pressure seal bonnet check valve is also one type of cast pressure seal bonnet swing check valve that 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. ANSI swing check valves are widely used in series of industries, especially in oil & gas filed, power plant, etc. Flowspec Luokai manufactures the ANSI pressure seal bonnet check valve in accordance with API6D / BS 1868. Contact us today. Get the better prices. 30 years of experience. Great after-sales service.
1. FEATURES
- Standard swing type disc
- Renewable seat ring is available
- PSC, pressure seal cover
- Non-penetrate disc shaft
- Horizontal or vertical service
- Flanged or butt-welding ends
3. STANDARDS
- Design & manufacturing: API6D / BS 1868
- Steel check valve: ASME B16.34 / ISO14313
- Face to face: ANSI B16.10
- Flanged ends: ANSI B16.5/B16.47
- Butt-welded ends: ASME B16.25
- Inspection & testing: API598
2. TECHNICAL SPECIFICATIONS
- 900LB~2500LB
- Size: 2″~30″ (DN50~750mm)
- Materials: steel A216 WCB, alloy steel A217 WC6, stainless steel304 A351 CF8, stainless steel 316 A351 CF8M
- Applicable medium: water, oil, gas, corrosive
- Applicable temperature: -29℃~+425℃(higher temperature is available upon request)
- Sour service conditions: NACE MR-01-75
4. APPLICATIONS
- Petroleum
- Chemical industry
- Pharmacy
- Chemical fertilizer
- Power plant
- Texitile
- Printing & dyeing
- Oil & gas
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


