Guardian Series | API 6D Non-Slam Piston Check Valve
C&C Industries
The C&C Guardian Series is an API 6D non-slam piston check valve engineered for critical applications where traditional swing check valves fail. Designed to eliminate valve slam and reduce pressure surges, it provides controlled, reliable backflow prevention in high-performance oil & gas systems.
Built for sizes from 2” through 12” and pressure classes from 150 to 1500, the Guardian Series is designed to meet demanding pipeline and process requirements. Its piston-style operation, combined with a spring-assisted and orifice-controlled closing mechanism, ensures smooth, controlled response to changing flow conditions.
Specifically suited for pulsating and reciprocating service, this valve delivers long-term reliability in systems where rapid flow changes would cause damage to conventional check valves.
Typical Applications:
Compression stations, reciprocating compressors, gas gathering systems, metering skids, natural gas plants, and chemical processing systems
Key Features
- API 6D monogrammed design
- Sizes from 2” through 12”
- ASME Class 150 through 1500 pressure ratings
- Non-slam piston design
- Spring-assisted closing mechanism
- Orifice-controlled closing speed
- Full material traceability
- 100% factory tested
- NACE MR0175 / ISO 15156 compliant
- Flanged ends per ASME B16.5
- End-to-end per ASME B16.10
- Available in carbon steel, LCC, and stainless steel
PERFORMANCE ADVANTAGES
Why the Guardian Performs Where It Counts
NON-SLAM DESIGN ELIMINATES WATER
HAMMER & SHOCK
Unlike swing check valves that can slam shut during rapid flow reversal, the Guardian Series uses a piston and spring-assisted mechanism to control closing speed. This significantly reduces water hammer, protecting piping systems, compressors, and downstream equipment.
OPTIMIZED FOR PULSATING &
RECIPROCATING SERVICE
The valve is specifically engineered for applications with rapid or inconsistent flow changes. The internal orifice dampens piston movement, allowing the valve to respond smoothly instead of reacting violently to pressure shifts.
POSITIVE SHUTOFF WITH INCREASING
BACKFLOW PRESSURE
The piston design tightens sealing as backflow pressure increases, improving shutoff integrity exactly when it matters most. This protects upstream equipment and prevents system damage during reverse flow conditions.
ENGINEERED MATERIALS FOR LONG
TERM DURABILITY
With components such as stainless steel pistons, Inconel springs, and nitrided wear surfaces, the Guardian Series is built to withstand wear, pressure cycling, and harsh operating conditions over extended service life.