Specifications Working Pressure Temperature Cracking Pressure Maximum Back Pressure Maximum Pressure Drop Minimum Burst Pressure at 70°F (20°C) Flow Coefficient Body Material End Connections •  Type •  Size

Up to 3000 psig (206 bar) –10 to 400°F (–23 to 204°C) Less than 2 psi (0.14 bar) Full pressure rating 145 psi (10.0 bar) 12 000 psig (826 bar) 0.55 and 0.70 316L stainless steel Tube butt welds, VCR® face seal fittings, Swagelok tube fittings 1/4 to 1/2 in.; 6 mm

More Information
Download the All-Welded Check Valves—CW Series catalog.
Find high-purity check valves in the product search.

Other Products
Ultrahigh-purity O-ring–free fluoropolymer check valves

Features

• Forward flow starts at less than 2 psig (0.14 bar) pressure differential.
• Valve closes with less than 2 psig (0.14 bar) back pressure.
• Choice of standard or high-purity wetted surface finishes.
• Poppet is fluorocarbon FKM-bonded 316L stainless steel; other materials are available

CW Series Check Valve Process Specifications 
Standard, no process designator: Special Cleaning and Packaging (SC-11)

• Special cleaning with non–ozone-depleting chemicals
• Performed in specially cleaned areas; valves are individually bagged
• 20 µin. (0.51 µm) average, machine finished.

Ultrahigh-purity, process designator P: Ultrahigh-Purity Process Specification (SC-01)

• Ultrahigh-purity cleaning with a continuously monitored, deionized water, ultrasonic cleaning system
• Performed in ISO Class 4 work areas; valves are double bagged and vacuum sealed in cleanroom bags
• 8 µin. (0.20 µm) average, machine finished and electropolished.

Testing
All CW series check valves are factory tested for crack and reseal performance.

Options
Aflas®, Buna N, ethylene propylene, and neoprene poppet bonding materials are available.