Parker CO Check Valves – Up to 414 bar and 204°C (mm)

Parker CO Series Check Valves – Precision and Tight Flow Control for Demanding Applications

Parker CO Series delivers high-integrity, one-way flow control of gases and liquids in critical industries such as chemical processing, oil and gas, power generation, and pharmaceuticals. The valves are ideal for applications with strict requirements for bubble-tight sealing, minimal leakage, and reliable resealing performance.

Key Features:

• 100% factory tested for cracking and resealing
• Robust poppet design for high operational reliability
• Pressure rating up to 414 bar (6000 psig)
• Temperature resistant up to 204°C
• Orifice sizes from 4.0 mm to 10.3 mm
• Cv values from 0.43 to 2.65
• Heat code traceability for quality assurance
• Optional oxygen cleaning (ASTM G93 Level C)

Constructed from 316 stainless steel, the CO Series is available with cracking pressures of 1/3, 1, 5, 10, or 25 psi for precise system control. Available seal materials include Fluorocarbon (FKM), Nitrile (NBR), Ethylene Propylene (EPR), and Highly Fluorinated Fluorocarbon (FFKM).

Connection types such as NPT, CPI™, A-LOK®, and VacuSeal ensure flexible integration into existing piping systems. Parker also offers repair kits that extend valve service life and provide cost-effective long-term value.