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Help CenterFull Bore Spring Loaded Check Valve 4 Inch ANSI 600 for Oil & Gas
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Shanghai Zhibang Valve Manufacture Co., Ltd. (established in 2016) takes pride in offering a premium Full Bore Spring Loaded Check Valve, 4 inch, ANSI 600, specifically engineered for demanding oil & gas applications. Our valve ensures reliable backflow prevention with minimal pressure drop, thanks to the full bore design and spring-assisted closure mechanism. As an ISO 9001 certified manufacturer with an annual export value of US$1–1.5 million, we deliver consistent quality and performance to markets across North America, South America, Europe, and Asia.
This check valve is built to withstand harsh environments, featuring robust materials and precise machining. The spring loaded design guarantees rapid closing at zero flow, preventing water hammer and protecting downstream equipment. Whether for crude oil pipelines, natural gas processing, or refinery applications, this valve meets the highest industry standards including API 6D and ASME B16.34.
Key Features & Technical Specifications
- Full Bore Design: Unrestricted flow path minimizes pressure loss and allows pigging operations.
- Spring Assisted Closing: Ensures tight sealing even under low flow conditions, reducing reverse flow risk.
- ANSI Class 600 Rating: Suitable for high pressure systems up to 1480 psi (10.2 MPa) at 100°F.
- Durable Materials: Available in WCB carbon steel, CF8M stainless steel, or duplex alloys (optional).
- Flanged Ends: Raised face (RF) or ring type joint (RTJ) connections per ASME B16.5.
- Fire Safe Design: Meets API 607 fire test requirements upon request.
- Low Maintenance: Simple construction with only a few moving parts, reducing downtime.
| Size | 4 inch (DN100) |
| Pressure Class | ANSI 600 |
| End Connection | Flanged (RF/RTJ) per ASME B16.5 |
| Material Grade | WCB / LCB / CF8M / Duplex (customizable) |
| Spring Material | SS316 / Inconel X-750 (optional) |
| Test Pressure | Shell: 2220 psi (15.3 MPa) / Seat: 1480 psi (10.2 MPa) |
| Operating Temperature | -29°C to +425°C (higher on request) |
Advantages for Oil & Gas Applications
The full bore geometry ensures that the valve does not create a bottleneck in the pipeline, making it ideal for pigging operations and high-viscosity fluids. The spring loaded mechanism reduces the risk of slamming and water hammer, which is critical for protecting expensive compressors and pumps. Additionally, the valve can be supplied with NACE MR0175 compliant materials for sour service environments, ensuring long-term reliability in H2S-containing media.
Our manufacturing process includes 100% pressure testing (hydrostatic and pneumatic) as per API 598. Every valve is traceable with a unique serial number, and material certificates are provided upon request. The product is designed for easy installation between flanges, and the compact body reduces weight and space requirements.
Trust & Reliability
Shanghai Zhibang Valve Manufacture Co., Ltd. has been delivering high-quality valves since 2016, with an annual export value exceeding US$1 million. Our ISO 9001:2015 certified quality management system ensures consistent production standards. We have supplied valves to projects in over 20 countries, including North America, Europe, and the Middle East. Our factory in Shanghai, China, is well-equipped with CNC machines, testing facilities, and a skilled workforce.
We offer flexible shipping options from Shanghai, Guangzhou, Hong Kong, and Beijing ports. Lead times are typically 30–45 days for standard sizes, with expedited services available. For large orders or custom specifications, we provide dedicated engineering support.
Contact us today for a quote or technical datasheet. Our team is ready to assist with selection, customization, and after-sales support.
Frequently Asked Questions (FAQ)
Q: What is the difference between a full bore check valve and a reduced bore check valve?
A: A full bore check valve has an internal diameter equal to the pipe bore, allowing unrestricted flow and pigging. A reduced bore valve has a smaller internal diameter, which creates higher pressure drop and is not suitable for pigging.
Q: Can this valve be used for vertical installation?
A: Yes, the spring loaded design allows installation in any orientation, including vertical (flow upward). However, consult the manufacturer for specific spring force requirements.
Q: What materials are available for sour service (NACE)?
A: We can supply valves with NACE MR0175 compliant materials, such as LCB carbon steel or 316 stainless steel with controlled hardness. Please specify when ordering.
Q: What is the maximum working pressure at 200°F?
A: For ANSI 600, the pressure rating decreases with temperature. At 200°F, the maximum allowable working pressure is approximately 1370 psi (9.45 MPa) for carbon steel. A detailed pressure-temperature chart is available upon request.
Q: Do you provide third-party inspection?
A: Yes, we accept third-party inspection from agencies such as SGS, BV, or Lloyds. Additional charges may apply.
Q: What is the typical lead time for this valve?
A: Standard lead time is 30–45 days after order confirmation. For urgent orders, we can expedite to 20–25 days with a surcharge.
Q: Can the spring be replaced in the field?
A: Yes, the spring is accessible by removing the bonnet. Proper maintenance procedure should be followed to avoid damage to sealing surfaces.
Q: Is the valve fire-safe certified?
A: Fire-safe design meeting API 607 is available as an option. Please request this feature during ordering.
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